', 'run step n and stop', eval)
28 |
29 | program.parse(process.argv);
30 |
31 | var gctx = new GCanvas();
32 |
33 | if(program.bounds) {
34 | var parts = program.bounds.split('x');
35 | gctx.canvas.width = eval(parts[0]);
36 | gctx.canvas.height = eval(parts[1]);
37 | gctx.canvas.depth = eval(parts[2]);
38 | }
39 |
40 | if(program.mm) gctx.unit = 'mm';
41 | if(program.inch) gctx.unit = 'inch';
42 | if(program.speed) gctx.speed = program.speed;
43 | if(program.feed) gctx.feed = program.feed;
44 | if(program.depth) gctx.depth = program.depth;
45 | if(program.depthofcut) gctx.depthOfCut = program.depthofcut;
46 | if(program.top) gctx.top = program.top;
47 | if(program.retract) gctx.retract = program.retract;
48 | if(program.width) gctx.canvas.width = program.width;
49 | if(program.height) gctx.canvas.height = program.height;
50 | if(program.tooldiameter) gctx.toolDiameter = program.tooldiameter;
51 |
52 | var setupNum = 0;
53 | var setupOffset = program.only || program.step || 0;
54 | var queue = [];
55 | var finished = false;
56 |
57 | function setup(desc, fn) {
58 | if(finished) return;
59 |
60 | setupNum++;
61 |
62 | if(arguments.length === 1) {
63 | fn = desc;
64 | desc = setupNum;
65 | }
66 |
67 | if(setupNum == program.only) {
68 | gctx.save();
69 | fn(gctx);
70 | gctx.restore();
71 | }
72 |
73 | if(!program.only && setupNum >= setupOffset) {
74 | queue.push({desc: desc, fn: fn});
75 | }
76 | }
77 |
78 | function processQueue() {
79 | if(queue.length === 0) return;
80 |
81 | var readline = require('readline'),
82 | rl = readline.createInterface(process.stdin, process.stderr);
83 | var currentStep;
84 |
85 | function next() {
86 | currentStep = queue.shift();
87 | if(!currentStep) {
88 | rl.close();
89 | return;
90 | }
91 |
92 | gctx.motion.rapid({z:0});
93 | rl.setPrompt('(setup '+currentStep.desc+')');
94 | rl.prompt();
95 | }
96 |
97 | rl.on('line', function() {
98 | gctx.save();
99 | currentStep.fn(gctx);
100 | gctx.restore();
101 | next();
102 | }).on('close', function() {
103 | process.exit(0);
104 | });
105 |
106 | next();
107 | }
108 |
109 | function run(file) {
110 | var util = require('util'),
111 | vm = require('vm'),
112 | sandbox = {
113 | setup: setup,
114 | step: setup,
115 | ctx: gctx,
116 | console: console
117 | };
118 |
119 | var code = ''+fs.readFileSync(file);
120 |
121 | // Remove #! declaration if there is one
122 | if(code[0] == '#') {
123 | code = code.split('\n').slice(1).join('\n');
124 | }
125 |
126 | var script = vm.createScript(code, file);
127 | script.runInNewContext(sandbox);
128 |
129 | if(sandbox[program.entry]) {
130 | sandbox[program.entry](gctx);
131 | }
132 |
133 | processQueue();
134 | }
135 |
136 | if(program.args.length === 0) {
137 | program.outputHelp();
138 | }
139 | else {
140 | program.args.forEach(function(file) {
141 | run(file);
142 | });
143 |
144 | gctx.motion.retract();
145 | gctx.motion.rapid({x:0,y:0});
146 | gctx.driver.send('M30');
147 | }
148 |
149 | // cleanup
150 | // gctx.motion.rapid({x:0,y:0,z:0});
151 |
--------------------------------------------------------------------------------
/lib/math/matrix.js:
--------------------------------------------------------------------------------
1 | module.exports = Matrix;
2 |
3 | var Point = require('./point');
4 |
5 | /**
6 | *
7 | * _ _
8 | * | a c tx |
9 | * | b d ty |
10 | * |_0 0 1 _|
11 | *
12 | * Creates a matrix for 2d affine transformations.
13 | *
14 | * concat, inverse, rotate, scale and translate return new matrices with the
15 | * transformations applied. The matrix is not modified in place.
16 | *
17 | * Returns the identity matrix when called with no arguments.
18 | * @name Matrix
19 | * @param {Number} [a]
20 | * @param {Number} [b]
21 | * @param {Number} [c]
22 | * @param {Number} [d]
23 | * @param {Number} [tx]
24 | * @param {Number} [ty]
25 | * @constructor
26 | */
27 | function Matrix(a, b, c, d, tx, ty) {
28 | this.a = a !== undefined ? a : 1;
29 | this.b = b || 0;
30 | this.c = c || 0;
31 | this.d = d !== undefined ? d : 1;
32 | this.tx = tx || 0;
33 | this.ty = ty || 0;
34 | }
35 |
36 | Matrix.prototype = {
37 |
38 | clone: function() {
39 | return new Matrix(
40 | this.a,
41 | this.b,
42 | this.c,
43 | this.d,
44 | this.tx,
45 | this.ty
46 | );
47 | },
48 |
49 | /**
50 | * Returns the result of this matrix multiplied by another matrix
51 | * combining the geometric effects of the two. In mathematical terms,
52 | * concatenating two matrixes is the same as combining them using matrix multiplication.
53 | * If this matrix is A and the matrix passed in is B, the resulting matrix is A x B
54 | * http://mathworld.wolfram.com/MatrixMultiplication.html
55 | * @name concat
56 | * @methodOf Matrix#
57 | *
58 | * @param {Matrix} matrix The matrix to multiply this matrix by.
59 | * @returns The result of the matrix multiplication, a new matrix.
60 | * @type Matrix
61 | */
62 | concat: function(matrix) {
63 | return new Matrix(
64 | this.a * matrix.a + this.c * matrix.b,
65 | this.b * matrix.a + this.d * matrix.b,
66 | this.a * matrix.c + this.c * matrix.d,
67 | this.b * matrix.c + this.d * matrix.d,
68 | this.a * matrix.tx + this.c * matrix.ty + this.tx,
69 | this.b * matrix.tx + this.d * matrix.ty + this.ty
70 | );
71 | },
72 |
73 | /**
74 | * Given a point in the pretransform coordinate space, returns the coordinates of
75 | * that point after the transformation occurs. Unlike the standard transformation
76 | * applied using the transformnew Point() method, the deltaTransformnew Point() method's
77 | * transformation does not consider the translation parameters tx and ty.
78 | * @name deltaTransformPoint
79 | * @methodOf Matrix#
80 | * @see #transformPoint
81 | *
82 | * @return A new point transformed by this matrix ignoring tx and ty.
83 | * @type Point
84 | */
85 | deltaTransformPoint: function(point) {
86 | return new Point(
87 | this.a * point.x + this.c * point.y,
88 | this.b * point.x + this.d * point.y
89 | );
90 | },
91 |
92 | /**
93 | * Returns the inverse of the matrix.
94 | * http://mathworld.wolfram.com/MatrixInverse.html
95 | * @name inverse
96 | * @methodOf Matrix#
97 | *
98 | * @returns A new matrix that is the inverse of this matrix.
99 | * @type Matrix
100 | */
101 | inverse: function() {
102 | var determinant = this.a * this.d - this.b * this.c;
103 | return new Matrix(
104 | this.d / determinant,
105 | -this.b / determinant,
106 | -this.c / determinant,
107 | this.a / determinant,
108 | (this.c * this.ty - this.d * this.tx) / determinant,
109 | (this.b * this.tx - this.a * this.ty) / determinant
110 | );
111 | },
112 |
113 | /**
114 | * Returns a new matrix that corresponds this matrix multiplied by a
115 | * a rotation matrix.
116 | * @name rotate
117 | * @methodOf Matrix#
118 | * @see Matrix.rotation
119 | *
120 | * @param {Number} theta Amount to rotate in radians.
121 | * @param {Point} [aboutPoint] The point about which this rotation occurs. Defaults to (0,0).
122 | * @returns A new matrix, rotated by the specified amount.
123 | * @type Matrix
124 | */
125 | rotate: function(theta, aboutPoint) {
126 | return this.concat(Matrix.rotation(theta, aboutPoint));
127 | },
128 |
129 | /**
130 | * Returns a new matrix that corresponds this matrix multiplied by a
131 | * a scaling matrix.
132 | * @name scale
133 | * @methodOf Matrix#
134 | * @see Matrix.scale
135 | *
136 | * @param {Number} sx
137 | * @param {Number} [sy]
138 | * @param {Point} [aboutPoint] The point that remains fixed during the scaling
139 | * @type Matrix
140 | */
141 | scale: function(sx, sy, aboutPoint) {
142 | return this.concat(Matrix.scale(sx, sy, aboutPoint));
143 | },
144 |
145 | /**
146 | * Returns the result of applying the geometric transformation represented by the
147 | * Matrix object to the specified point.
148 | * @name transformPoint
149 | * @methodOf Matrix#
150 | * @see #deltaTransformPoint
151 | *
152 | * @returns A new point with the transformation applied.
153 | * @type Point
154 | */
155 | transformPoint: function(point) {
156 | return new Point(
157 | this.a * point.x + this.c * point.y + this.tx,
158 | this.b * point.x + this.d * point.y + this.ty
159 | );
160 | },
161 |
162 | /**
163 | * Translates the matrix along the x and y axes, as specified by the tx and ty parameters.
164 | * @name translate
165 | * @methodOf Matrix#
166 | * @see Matrix.translation
167 | *
168 | * @param {Number} tx The translation along the x axis.
169 | * @param {Number} ty The translation along the y axis.
170 | * @returns A new matrix with the translation applied.
171 | * @type Matrix
172 | */
173 | translate: function(tx, ty) {
174 | return this.concat(Matrix.translation(tx, ty));
175 | }
176 | };
177 |
178 | /**
179 | * Creates a matrix transformation that corresponds to the given rotation,
180 | * around (0,0) or the specified point.
181 | * @see Matrix#rotate
182 | *
183 | * @param {Number} theta Rotation in radians.
184 | * @param {Point} [aboutPoint] The point about which this rotation occurs. Defaults to (0,0).
185 | * @returns
186 | * @type Matrix
187 | */
188 | Matrix.rotation = function(theta, aboutPoint) {
189 | var rotationMatrix = new Matrix(
190 | Math.cos(theta),
191 | Math.sin(theta),
192 | -Math.sin(theta),
193 | Math.cos(theta)
194 | );
195 |
196 | if(aboutPoint) {
197 | rotationMatrix =
198 | Matrix.translation(aboutPoint.x, aboutPoint.y).concat(
199 | rotationMatrix
200 | ).concat(
201 | Matrix.translation(-aboutPoint.x, -aboutPoint.y)
202 | );
203 | }
204 |
205 | return rotationMatrix;
206 | };
207 |
208 | /**
209 | * Returns a matrix that corresponds to scaling by factors of sx, sy along
210 | * the x and y axis respectively.
211 | * If only one parameter is given the matrix is scaled uniformly along both axis.
212 | * If the optional aboutPoint parameter is given the scaling takes place
213 | * about the given point.
214 | * @see Matrix#scale
215 | *
216 | * @param {Number} sx The amount to scale by along the x axis or uniformly if no sy is given.
217 | * @param {Number} [sy] The amount to scale by along the y axis.
218 | * @param {Point} [aboutPoint] The point about which the scaling occurs. Defaults to (0,0).
219 | * @returns A matrix transformation representing scaling by sx and sy.
220 | * @type Matrix
221 | */
222 | Matrix.scale = function(sx, sy, aboutPoint) {
223 | sy = sy || sx;
224 |
225 | var scaleMatrix = new Matrix(sx, 0, 0, sy);
226 |
227 | if(aboutPoint) {
228 | scaleMatrix =
229 | Matrix.translation(aboutPoint.x, aboutPoint.y).concat(
230 | scaleMatrix
231 | ).concat(
232 | Matrix.translation(-aboutPoint.x, -aboutPoint.y)
233 | );
234 | }
235 |
236 | return scaleMatrix;
237 | };
238 |
239 | /**
240 | * Returns a matrix that corresponds to a translation of tx, ty.
241 | * @see Matrix#translate
242 | *
243 | * @param {Number} tx The amount to translate in the x direction.
244 | * @param {Number} ty The amount to translate in the y direction.
245 | * @return A matrix transformation representing a translation by tx and ty.
246 | * @type Matrix
247 | */
248 | Matrix.translation = function(tx, ty) {
249 | return new Matrix(1, 0, 0, 1, tx, ty);
250 | };
251 |
252 | /**
253 | * A constant representing the identity matrix.
254 | * @name IDENTITY
255 | * @fieldOf Matrix
256 | */
257 | Matrix.IDENTITY = new Matrix();
258 | /**
259 | * A constant representing the horizontal flip transformation matrix.
260 | * @name HORIZONTAL_FLIP
261 | * @fieldOf Matrix
262 | */
263 | Matrix.HORIZONTAL_FLIP = new Matrix(-1, 0, 0, 1);
264 | /**
265 | * A constant representing the vertical flip transformation matrix.
266 | * @name VERTICAL_FLIP
267 | * @fieldOf Matrix
268 | */
269 | Matrix.VERTICAL_FLIP = new Matrix(1, 0, 0, -1);
270 |
--------------------------------------------------------------------------------
/lib/motion.js:
--------------------------------------------------------------------------------
1 | module.exports = Motion;
2 |
3 | var Point = require('./math/point')
4 | , Path = require('./path')
5 | , SubPath = require('./subpath')
6 | , utils = require('./utils');
7 |
8 | /**
9 | * Realtime motion interface
10 | * This actually sends commands to the driver.
11 | * */
12 | function Motion(ctx) {
13 | this.ctx = ctx;
14 | this.position = new Point(0,0,0);
15 | this.position.a = 0;
16 | }
17 |
18 | Motion.prototype = {
19 | retract: function() {
20 | this.rapid({z:this.ctx.retract});
21 | }
22 | , plunge: function() {
23 | this.rapid({z:-this.ctx.top});
24 | }
25 | , zero: function(params) {
26 | this.ctx.driver.zero.call(this.ctx.driver, params);
27 | }
28 | , rapid: function(params) {
29 | var newPosition = this.postProcess(params);
30 | if(!newPosition) return;
31 |
32 | this.ctx.driver.rapid.call(this.ctx.driver, params);
33 | this.position = newPosition;
34 | }
35 | , linear: function(params) {
36 | var newPosition = this.postProcess(params);
37 | if(!newPosition) return;
38 |
39 | // if(params.z - this.position.z > 10)
40 | // debugger;
41 |
42 | this.ctx.driver.linear.call(this.ctx.driver, params);
43 | this.position = newPosition;
44 | }
45 | , arcCW: function(params) {
46 | return this.arc(params,false);
47 | }
48 | , arcCCW: function(params) {
49 | return this.arc(params,true);
50 | }
51 | , arc: function(params,ccw) {
52 | var newPosition = this.postProcess(params);
53 | // Note: Can be cyclic so we don't
54 | // ignore it if the position is the same
55 | //
56 | var cx = this.position.x + params.i;
57 | var cy = this.position.y + params.j;
58 | var arc = utils.pointsToArc({
59 | x: cx,
60 | y: cy
61 | },
62 | this.position, {
63 | x: params.x,
64 | y: params.y
65 | });
66 |
67 | var length = arc.radius * (arc.end-arc.start);
68 | var f = length/(1/this.ctx.feed);
69 | f = Math.round(f * 1000000) / 1000000;
70 | if(f) params.f = Math.abs(f);
71 |
72 |
73 | if(!ccw && this.ctx.driver.arcCW) {
74 | this.ctx.driver.arcCW.call(this.ctx.driver, params);
75 | }
76 | else if(ccw && this.ctx.driver.arcCCW) {
77 | this.ctx.driver.arcCCW.call(this.ctx.driver, params);
78 | }
79 | else {
80 |
81 | this.interpolate('arc',[
82 | cx,
83 | cy,
84 | arc.radius,
85 | arc.start,
86 | arc.end,
87 | ccw],
88 | params.z||0);
89 | }
90 |
91 | if(newPosition) {
92 | this.position = newPosition;
93 | }
94 | }
95 | , postProcess: function(params) {
96 | // Sync meta
97 | if(this.ctx.driver.unit
98 | && this.ctx.unit != this.currentUnit) {
99 | this.ctx.driver.unit(this.ctx.unit);
100 | this.currentUnit = this.ctx.unit;
101 | }
102 |
103 | // Sync meta
104 | if(this.ctx.driver.meta
105 | && this.ctx.toolDiameter != this.currentToolDiameter) {
106 | this.ctx.driver.meta({
107 | tooldiameter: this.ctx.toolDiameter
108 | });
109 | this.currentToolDiameter = this.ctx.toolDiameter;
110 | }
111 |
112 | // Set new spindle atc changed
113 | if(this.ctx.driver.atc
114 | && this.ctx.atc != this.currentAtc) {
115 | this.ctx.driver.atc(this.ctx.atc);
116 | this.currentAtc = this.ctx.atc;
117 | }
118 |
119 | // Set new spindle speed changed
120 | if(this.ctx.driver.speed
121 | && this.ctx.speed != this.currentSpeed) {
122 | this.ctx.driver.speed(this.ctx.speed);
123 | this.currentSpeed = this.ctx.speed;
124 | }
125 |
126 | // Set new feedrate changed
127 | if(this.ctx.driver.feed
128 | && this.ctx.feed != this.currentFeed) {
129 | // Always use inverse time mode
130 | // but we only send a G93 when there is a feedrate.
131 | // This allows backwards compatibility with global
132 | // classic feedrates.
133 | this.ctx.driver.send('G93');
134 | this.currentFeed = this.ctx.feed;
135 | }
136 |
137 | // Set coolant if changed
138 | if(this.ctx.driver.coolant
139 | && this.ctx.coolant != this.currentCoolant) {
140 | this.ctx.driver.coolant(this.ctx.coolant);
141 | this.currentCoolant = this.ctx.coolant;
142 | }
143 |
144 | var v1 = new Point(
145 | params.x === undefined ? this.position.x : params.x
146 | , params.y === undefined ? this.position.y : params.y
147 | , params.z === undefined ? this.position.z : params.z
148 | , params.a === undefined ? this.position.a : params.a
149 | );
150 |
151 | // var dist = Point.distance(v1, this.position);
152 | var v2 = this.position;
153 | var dist = Math.sqrt(
154 | Math.pow(v2.x - v1.x, 2) +
155 | Math.pow(v2.y - v1.y, 2) +
156 | Math.pow(v2.z - v1.z, 2));
157 |
158 |
159 | if(!params.f) {
160 | var f = dist/(1/this.ctx.feed);
161 | f = Math.round(f * 1000000) / 1000000;
162 | if(f) params.f = Math.abs(f);
163 | }
164 |
165 |
166 | if(utils.samePos(this.position, v1)) {
167 | return false;
168 | }
169 |
170 | this.ctx.filters.forEach(function(f) {
171 | var tmp = f.call(this.ctx, params);
172 |
173 | if(tmp) {
174 | for(var k in tmp) {
175 | params[k] = tmp[k];
176 | }
177 | }
178 | });
179 |
180 | // Round down the decimal points to 10 nanometers
181 | // Gotta accept that there's no we're that precise.
182 | for(var k in params) {
183 | if(typeof params[k] === 'number')
184 | params[k] = Math.round(params[k] * 100000) / 100000;
185 | }
186 |
187 |
188 | return v1;
189 | }
190 |
191 | , interpolate: function(name, args, zEnd) {
192 | var path = new SubPath();
193 | path[name].apply(path, args);
194 |
195 | var curLen = 0;
196 | var totalLen = path.getLength();
197 | var zStart = this.position.z;
198 |
199 | function helix() {
200 | var fullDelta = zEnd - zStart;
201 | var ratio = (curLen / totalLen);
202 | var curDelta = fullDelta * ratio;
203 | return zStart + curDelta;
204 | }
205 |
206 | var pts = path.getPoints(40);
207 | for(var i=0,l=pts.length; i < l; ++i) {
208 | var p=pts[i];
209 |
210 | var xo = p.x - this.position.x;
211 | var yo = p.y - this.position.y;
212 | curLen += Math.sqrt(xo*xo + yo*yo);
213 |
214 | this.linear({x:p.x, y:p.y, z:helix()});
215 | }
216 | }
217 |
218 | , followPath: function(path, zEnd) {
219 | if(!path) return false;
220 |
221 | if(path.subPaths) {
222 | path.subPaths.forEach(function(subPath) {
223 | this.followPath(subPath, zEnd);
224 | }, this);
225 | return;
226 | }
227 |
228 | var zStart = this.position.z;
229 | var totalLen = path.getLength();
230 | var curLen = 0;
231 | var each = {};
232 | var motion = this;
233 | var driver = this.ctx.driver;
234 | var ctx = this.ctx;
235 | var ramping = path.isClosed() && ctx.ramping != false;
236 |
237 | function helix() {
238 | if(!ramping) {
239 | return zEnd;
240 | }
241 |
242 | // Avoid divide by 0 in case of
243 | // a single moveTo action
244 | if(totalLen === 0) return 0;
245 |
246 | var fullDelta = zEnd - zStart;
247 | var ratio = (curLen / totalLen);
248 | var curDelta = fullDelta * ratio;
249 |
250 | return zStart + curDelta;
251 | }
252 |
253 | function interpolate(name, args) {
254 | var path = new SubPath();
255 | path.moveTo(motion.position.x, motion.position.y);
256 | path[name].apply(path, args);
257 |
258 | var pts = path.getPoints(40);
259 | for(var i=0,l=pts.length; i < l; ++i) {
260 | var p=pts[i];
261 |
262 | motion.linear({x:p.x, y:p.y, z:helix()});
263 | }
264 | }
265 |
266 | each[Path.actions.MOVE_TO] = function(x,y) {
267 | // Optimize out 0 distances moves
268 | var sameXY = (utils.sameFloat(x, this.position.x) &&
269 | utils.sameFloat(y, this.position.y));
270 |
271 | if(ramping && sameXY) return;
272 |
273 | motion.retract();
274 | motion.rapid({x:x,y:y});
275 | motion.plunge();
276 |
277 | if(!ramping) {
278 | motion.linear({z:zEnd});
279 | }
280 |
281 | zStart = motion.position.z;
282 |
283 | };
284 |
285 | each[Path.actions.LINE_TO] = function(x,y) {
286 | motion.linear({x:x,y:y,z:helix()});
287 | };
288 |
289 | each[Path.actions.ELLIPSE] = function(x, y, rx, ry,
290 | aStart, aEnd, ccw) {
291 | // Detect plain arc
292 | if(utils.sameFloat(rx,ry)) {
293 | var points = utils.arcToPoints(x, y,
294 | aStart,
295 | aEnd,
296 | rx);
297 | var params = {
298 | x: points.end.x, y: points.end.y,
299 | i: x-points.start.x, j: y-points.start.y,
300 | z: helix()
301 | };
302 |
303 | motion.arc(params, ccw);
304 |
305 | }
306 | else {
307 | interpolate('ellipse', arguments, mx, my);
308 | }
309 | };
310 |
311 | each[Path.actions.BEZIER_CURVE_TO] = function() {
312 | interpolate('bezierCurveTo', arguments);
313 | };
314 |
315 | each[Path.actions.QUADRATIC_CURVE_TO] = function() {
316 | interpolate('quadraticCurveTo', arguments);
317 | };
318 |
319 | for(var i = 0, l = path.actions.length; i < l; ++i) {
320 | item = path.actions[i]
321 |
322 | if(i != 0) {
323 | var x0 = this.position.x;
324 | var y0 = this.position.y;
325 | curLen += path.getActionLength(x0, y0, i);
326 | }
327 |
328 |
329 | // Every action should be plunged except for move
330 | // if(item.action !== Path.actions.MOVE_TO) {
331 | // motion.plunge();
332 | // }
333 |
334 | each[item.action].apply(this, item.args);
335 | }
336 | }
337 |
338 | };
339 |
--------------------------------------------------------------------------------
/test/test.gcanvas.js:
--------------------------------------------------------------------------------
1 | describe('GCanvas', function() {
2 | var expect = require('chai').expect
3 | var GCanvas = require('../')
4 | var SubPath = require('../lib/subpath')
5 | var TestDriver = require('./support/testdriver')
6 |
7 | var ctx, robot, hand;
8 | beforeEach(function() {
9 | robot = new TestDriver();
10 | hand = new TestDriver();
11 | ctx = new GCanvas(robot);
12 | ctx.depth = 0;
13 | ctx.depthOfCut = 0;
14 | });
15 |
16 | describe('#moveTo', function() {
17 | it('sends #rapid', function() {
18 | ctx.moveTo(10,10);
19 | ctx.stroke();
20 | hand.rapid({x:10,y:10});
21 | expect(robot.result).eql(hand.result);
22 | });
23 |
24 | it('retracts tool', function() {
25 | ctx.depth = 1;
26 | ctx.moveTo(0,0);
27 | ctx.lineTo(10,0);
28 | ctx.moveTo(10,10);
29 | ctx.stroke();
30 |
31 | hand.linear({z:-1}); // plunge
32 | hand.linear({x:10,y:0,z:-1}); // lineTo
33 | hand.rapid({z:0}); // retract
34 | hand.rapid({x:10,y:10}); // moveTo
35 |
36 | expect(robot.result).eql(hand.result);
37 | });
38 |
39 | it('optimizes out 0 distance moves', function() {
40 | ctx.moveTo(10,10);
41 | ctx.moveTo(10,10);
42 | ctx.stroke();
43 | hand.rapid({x:10,y:10});
44 | expect(robot.result).eql(hand.result);
45 | });
46 |
47 |
48 | });
49 |
50 | describe('#lineTo', function() {
51 | it('sends #linear', function() {
52 | ctx.moveTo(0,0);
53 | ctx.lineTo(10,10);
54 | ctx.stroke();
55 |
56 | hand.linear({x:10,y:10,z:0});
57 |
58 | expect(robot.result).eql(hand.result);
59 | });
60 |
61 | it('just moves if no subpath', function() {
62 | ctx.lineTo(10,10);
63 | ctx.stroke();
64 |
65 | hand.rapid({x:10,y:10});
66 |
67 | expect(robot.result).eql(hand.result);
68 | });
69 |
70 | it('plunges tool', function() {
71 | ctx.depth = 1;
72 | ctx.moveTo(0,0);
73 | ctx.lineTo(10,10);
74 | ctx.stroke();
75 |
76 | hand.linear({z:-1});
77 | hand.linear({x:10,y:10,z:-1});
78 | hand.rapid({z:0});
79 | expect(robot.result).eql(hand.result);
80 | });
81 |
82 | it('plunges tool (inverted z)', function() {
83 | ctx.depth = -1;
84 | ctx.moveTo(0,0);
85 | ctx.lineTo(10,10);
86 | ctx.stroke();
87 |
88 | hand.linear({z:1});
89 | hand.linear({x:10,y:10,z:1});
90 | hand.rapid({z:0});
91 |
92 | expect(robot.result).eql(hand.result);
93 | });
94 |
95 | it('plunges tool (inverted z and +depthOfCut)', function() {
96 | ctx.depth = -1;
97 | ctx.depthOfCut = 1;
98 | ctx.moveTo(0,0);
99 | ctx.lineTo(10,10);
100 | ctx.stroke();
101 |
102 | hand.linear({z:1});
103 | hand.linear({x:10,y:10,z:1});
104 | hand.rapid({z:0});
105 |
106 | expect(robot.result).eql(hand.result);
107 | });
108 | });
109 |
110 | describe('#arc', function() {
111 | it('sends native #arcCW when possible', function() {
112 | ctx.arc(10, 10, 10, 0, Math.PI);
113 | ctx.stroke();
114 |
115 | hand.rapid({x:20,y:10});
116 | hand.arcCW({x:0,y:10,z:0,i:-10,j:0});
117 |
118 | expect(robot.result).eql(hand.result);
119 | });
120 |
121 | it('sends native #arcCCW when possible', function() {
122 | ctx.arc(10, 10, 10, 0, Math.PI, true);
123 | ctx.stroke();
124 |
125 | hand.rapid({x:20,y:10});
126 | hand.arcCCW({x:0,y:10,z:0,i:-10,j:0});
127 |
128 | expect(robot.result).eql(hand.result);
129 | });
130 |
131 | it('plunges and retracts semi-circles', function() {
132 | ctx.depth = 1;
133 | ctx.arc(10, 10, 10, 0, Math.PI);
134 | ctx.stroke();
135 |
136 | hand.rapid({x:20,y:10});
137 | hand.linear({z:-1});
138 | hand.arcCW({x:0,y:10,i:-10,j:0,z:-1});
139 | hand.rapid({z:0});
140 |
141 | expect(robot.result).eql(hand.result);
142 | });
143 |
144 | it('spirals through full circles', function() {
145 | ctx.depth = 2;
146 | ctx.depthOfCut=1;
147 | ctx.arc(10, 10, 10, 0, Math.PI*2);
148 | ctx.stroke();
149 |
150 | hand.rapid({x:20,y:10});
151 | hand.arcCW({x:20,y:10,z:-1,i:-10,j:0});
152 | hand.arcCW({x:20,y:10,z:-2,i:-10,j:0});
153 | hand.arcCW({x:20,y:10,z:-2,i:-10,j:0});
154 | hand.rapid({z:0});
155 |
156 | expect(robot.result).eql(hand.result);
157 | });
158 | });
159 |
160 |
161 | describe('context.feed', function() {
162 | it('inits inverse time mode and calculates F', function() {
163 | ctx.moveTo(0,0);
164 | ctx.lineTo(10,10);
165 | ctx.feed = 100;
166 | ctx.stroke();
167 |
168 | hand.send('G93');
169 | hand.linear({x:10,y:10,z:0,f:1414});
170 |
171 | expect(robot.result).eql(hand.result);
172 | });
173 | });
174 |
175 | describe('context.speed', function() {
176 | it('calls driver.speed() before next move', function() {
177 | ctx.moveTo(0,0);
178 | ctx.lineTo(10,10);
179 | ctx.speed = 100;
180 | ctx.stroke();
181 |
182 | hand.speed(100);
183 | hand.linear({x:10,y:10,z:0});
184 |
185 | expect(robot.result).eql(hand.result);
186 | });
187 | });
188 |
189 | describe('context.coolant', function() {
190 | it('calls driver.coolant() before next move', function() {
191 | ctx.moveTo(0,0);
192 | ctx.lineTo(10,10);
193 | ctx.coolant = "flood";
194 | ctx.stroke();
195 |
196 | hand.coolant("flood");
197 | hand.linear({x:10,y:10,z:0});
198 |
199 | expect(robot.result).eql(hand.result);
200 | });
201 | });
202 |
203 | describe('#_layer', function() {
204 | it('increments in depthOfCut to depth', function() {
205 | ctx.depth = 2;
206 | ctx.depthOfCut = 1;
207 | ctx.moveTo(0,0);
208 | ctx.lineTo(10,10);
209 | ctx.stroke();
210 |
211 | // first layer
212 | hand.linear({z:-1}); // plunge
213 | hand.linear({x:10,y:10,z:-1}); // lineTo
214 |
215 | // return to start
216 | hand.rapid({z:0}); // retract
217 | hand.rapid({x:0,y:0}); // moveTo
218 |
219 | // second layer
220 | hand.linear({z:-2}); // plunge
221 | hand.linear({x:10,y:10,z:-2}); // lineTo
222 |
223 | hand.rapid({z:0});
224 |
225 | expect(robot.result).eql(hand.result);
226 | });
227 |
228 | it('increments in depthOfCut to depth (-z, +doc)', function() {
229 | ctx.depth = -2;
230 | ctx.depthOfCut = 1;
231 | ctx.moveTo(0,0);
232 | ctx.lineTo(10,10);
233 | ctx.stroke();
234 |
235 | // first layer
236 | hand.linear({z:1}); // plunge
237 | hand.linear({x:10,y:10,z:1}); // lineTo
238 |
239 | // return to start
240 | hand.rapid({z:0}); // retract
241 | hand.rapid({x:0,y:0}); // moveTo
242 |
243 | // second layer
244 | hand.linear({z:2}); // plunge
245 | hand.linear({x:10,y:10,z:2}); // lineTo
246 |
247 | hand.rapid({z:0}); // retract
248 | expect(robot.result).eql(hand.result);
249 | });
250 |
251 | it('increments in depthOfCut to depth (-z, -doc)', function() {
252 | ctx.depth = -2;
253 | ctx.depthOfCut = -1;
254 | ctx.moveTo(0,0);
255 | ctx.lineTo(10,10);
256 | ctx.stroke();
257 |
258 | // first layer
259 | hand.linear({z:1}); // plunge
260 | hand.linear({x:10,y:10,z:1}); // lineTo
261 |
262 | // return to start
263 | hand.rapid({z:0}); // retract
264 | hand.rapid({x:0,y:0}); // moveTo
265 |
266 | // second layer
267 | hand.linear({z:2}); // plunge
268 | hand.linear({x:10,y:10,z:2}); // lineTo
269 |
270 | hand.rapid({z:0}); // retract
271 | expect(robot.result).eql(hand.result);
272 | });
273 | });
274 |
275 | describe('#fill', function() {
276 | it('offsets outward from center', function() {
277 | ctx.rect(0,0,10,10);
278 | ctx.toolDiameter = 8;
279 | ctx.fill();
280 |
281 | hand.rapid({x:6,y:6});
282 | hand.linear({x:6, y:4, z:0});
283 | hand.linear({x:4, y:4, z:0});
284 | hand.linear({x:4, y:6, z:0});
285 | hand.linear({x:6, y:6, z:0});
286 |
287 | expect(robot.result).eql(hand.result);
288 | });
289 |
290 | it('helixes down w/ ramping=true', function() {
291 | ctx.rect(0,0,10,10);
292 | ctx.toolDiameter = 8;
293 | ctx.depth = 10;
294 | ctx.ramping = true;
295 | ctx.fill();
296 |
297 | // helix
298 | hand.rapid({x:6,y:6});
299 | hand.linear({x:6, y:4, z:-3});
300 | hand.linear({x:4, y:4, z:-5});
301 | hand.linear({x:4, y:6, z:-8});
302 | hand.linear({x:6, y:6, z:-10});
303 |
304 | // finishing pass
305 | hand.linear({x:6, y:4, z:-10});
306 | hand.linear({x:4, y:4, z:-10});
307 | hand.linear({x:4, y:6, z:-10});
308 | hand.linear({x:6, y:6, z:-10});
309 |
310 | // retract
311 | hand.rapid({z:0});
312 |
313 | expect(robot.result).eql(hand.result);
314 | });
315 |
316 | it('steps down w/ ramping=false', function() {
317 | ctx.rect(0,0,10,10);
318 | ctx.toolDiameter = 8;
319 | ctx.depthOfCut = 5;
320 | ctx.depth = 10;
321 | ctx.ramping = false;
322 | ctx.fill();
323 |
324 | // pass 1
325 | hand.rapid({x:6, y:6});
326 | hand.linear({z:-5});
327 | hand.linear({x:6, y:4, z:-5});
328 | hand.linear({x:4, y:4, z:-5});
329 | hand.linear({x:4, y:6, z:-5});
330 | hand.linear({x:6, y:6, z:-5});
331 |
332 | // pass 2
333 | hand.rapid({z:0});
334 | hand.linear({z:-10});
335 | hand.linear({x:6, y:4, z:-10});
336 | hand.linear({x:4, y:4, z:-10});
337 | hand.linear({x:4, y:6, z:-10});
338 | hand.linear({x:6, y:6, z:-10});
339 |
340 | // retract
341 | hand.rapid({z:0});
342 |
343 | expect(robot.result).eql(hand.result);
344 | });
345 |
346 |
347 | it('ignores 0 alpha fillStyle', function() {
348 | ctx.rect(0,0,10,10);
349 | ctx.toolDiameter = 8;
350 | ctx.fillStyle='rgba(0,0,0,0)'
351 | ctx.fill();
352 |
353 | expect(robot.result).eql(hand.result);
354 | });
355 | });
356 |
357 |
358 | describe('#stroke', function() {
359 | it('offsets outward from center', function() {
360 | ctx.rect(0,0,10,10);
361 | ctx.toolDiameter = 8;
362 | ctx.stroke();
363 |
364 | hand.linear({x:10, y:0, z:0});
365 | hand.linear({x:10, y:10, z:0});
366 | hand.linear({x:0, y:10, z:0});
367 | hand.linear({x:0, y:0, z:0});
368 |
369 | expect(robot.result).eql(hand.result);
370 | });
371 |
372 | it('ignores 0 alpha strokeStyle', function() {
373 | ctx.rect(0,0,10,10);
374 | ctx.toolDiameter = 8;
375 | ctx.strokeStyle='rgba(0,0,0,0)'
376 | ctx.stroke();
377 |
378 | expect(robot.result).eql(hand.result);
379 | });
380 | });
381 | });
382 |
--------------------------------------------------------------------------------
/readme.md:
--------------------------------------------------------------------------------
1 | NOTICE: I have pretty much abandoned this project. I just don't have the means or incentive to maintain it, because I relocated to another country some time ago and haven't had a CNC machine since. I stick to traditional handtool woodworking these days when I do find the time to make things.
2 | ========
3 |
4 | Gcanvas
5 | ========
6 | An HTML5 Canvas implementation that generates Gcode for 4 axis CNC milling.
7 |
8 | ### Installation
9 | First make sure you have [nodejs](http://nodejs.org) installed.
10 | ```
11 | npm install -g gcanvas
12 | ```
13 |
14 | ### Example
15 | example.js
16 | ```
17 | function main(ctx) {
18 | ctx.translate(-90,0);
19 | ctx.toolDiameter = 1/8*25.4;
20 | ctx.depth = 5;
21 | ctx.font = '20pt Helvetiker';
22 | roundRect(ctx, 0,0,180,60,5);
23 | ctx.text('I < 3 robots', 12, 40);
24 | ctx.fill('evenodd');
25 | }
26 |
27 | function roundRect(ctx, x, y, w, h, r) {
28 | if (w < 2 * r) r = w / 2;
29 | if (h < 2 * r) r = h / 2;
30 | ctx.moveTo(x+r, y);
31 | ctx.arcTo(x+w, y, x+w, y+h, r);
32 | ctx.arcTo(x+w, y+h, x, y+h, r);
33 | ctx.arcTo(x, y+h, x, y, r);
34 | ctx.arcTo(x, y, x+w, y, r);
35 | ctx.closePath();
36 | }
37 | ```
38 | ```
39 | $ gcanvas example.js | gsim
40 | ```
41 | 
42 | ```
43 | $ gcanvas example.js | mycnc
44 | ```
45 | 
46 |
47 | ### Non-standard extensions to Canvas
48 |
49 | #### Properties
50 |
51 | * `ctx.toolDiameter` This must be set for fill() to work because it has to calculate tool offsets. stroke() only requires toolDiameter if align is not center.
52 |
53 | * `ctx.depth` Specifies the total depth to cut into the work. If not set the Z axis never changes.
54 |
55 | * `ctx.depthOfCut` Specifies an incrementing depth of cut in layers up to `ctx.depth`.
56 |
57 | * `ctx.top` The Z offset to the top of work surface. When this is set all cuts with plunge down to this depth before spiraling to their full depth. Use cautiously. If the actual work surface is closer this will break tools. I often use this in tandem with facing. First I align the tool to something within 1mm of the lowest part of my material surface, face it down to 1mm, then set ctx.top to 1mm. I then update ctx.top for every tool change.
58 | ```
59 | function main(ctx) {
60 | step('face', function() {
61 | ctx.depth = 1;
62 | ctx.fillRect(-20,-20,40,40);
63 | });
64 |
65 | // Outside of a step, applies to all steps after facing
66 | // even if they are run independently.
67 | ctx.top = 1;
68 |
69 | step('10mm hole', function() {
70 | ctx.depth = 20; // 20mm deep
71 | ctx.circle(0,0,10);
72 | ctx.fill();
73 | });
74 | }
75 |
76 | ```
77 |
78 | * `ctx.retract` Set a small distance to retract the tool between rapid moves to overcome imperfect surface tolerances. This is a simpler alternative to ctx.top when the work surface is flat and the tool can be aligned initially to surface zero. i.e. sheet stock. (default: 0)
79 |
80 | 
81 |
82 | * `ctx.feed` Sets the effective feedrate.
83 | To support coordinated axial and linear motion Gcanvas always generates inverse time mode feeds
84 | based on the distance of the linear motion, making axial feeds slave to linear.
85 |
86 | * `ctx.speed` Sets the spindle speed by sending a single S command.
87 |
88 | * `ctx.coolant` Can be true, false, "mist" (M07) or "flood" (M08). True defaults to "flood".
89 |
90 | * `ctx.align` Can be 'inner', 'outer', or 'center' (default). Non-center alignment closes the path.
91 |
92 | * `ctx.atc` Auto tool change. Sends `M06 T{ctx.atc}`. Make sure you update toolDiameter.
93 |
94 | * `ctx.unit` (mm|inch) Set unit mode. G20/G21
95 |
96 | * `ctx.ramping` (true|false) Ramping eases into the depth of cut helically. The alternative is to plunge directly down to depth for each cut. It can reduce cutting time to disable this when you use a center-cutting endmill on forgiving material. (default: true)
97 |
98 |
99 | #### Methods
100 |
101 | ##### `ctx.fill([windingRule, depth])`
102 | ##### `ctx.fill([depth])`
103 | Standard canvas fill(), but extended to allow a number for depth.
104 |
105 | * `windingRule`: 'nonzero' or 'evenodd'. (default: 'nonzero')
106 | * `depth`: Full depth to mill the current path to. (default: ctx.depth)
107 |
108 | ##### `ctx.stroke([align, depth])`
109 | ##### `ctx.stroke([depth])`
110 | Standard canvas stroke(), but can also take alignment and/or depth.
111 |
112 | * `align`: 'inner', 'outer', or 'center'. (default: ctx.align or 'center')
113 | * `depth`: Full depth to mill the current path to. (default: ctx.depth)
114 |
115 | ##### `ctx.filter(fn)`
116 | Adds a post-processing function before Gcode generation that allows
117 | you to change the parameters.
118 | * `fn`: function(params) i.e. {x: 10, y:20}
119 |
120 | Example: Cylindrical wrapping by transposing the X axis onto A
121 | ```
122 | ctx.toolDiameter = 1/4*25.5;
123 |
124 | var diameter = 10;
125 | var circumference = diameter * Math.PI;
126 |
127 | ctx.filter(function(p) {
128 | p.a = (p.x||0)/circumference*360;
129 | p.x = 0;
130 | });
131 |
132 | ctx.fillRect(0,0,circumference/2,10); // 180 degree slot around cylinder
133 | ```
134 |
135 |
136 | ##### `ctx.map(axes)`
137 | Adds a filter that maps the standard coordinate system to another one.
138 | * `axes`: A string representing the new coordinate system.
139 | You can also use '-' before any axis to make it negative.
140 |
141 | Example: Make Z- move towards the bed.
142 | ```
143 | ctx.map('xy-z');
144 | ```
145 |
146 |
147 | ##### `ctx.peckDrill(x, y, depth[, peck])`
148 | Drills to depth using a peck drilling strategy.
149 | * `depth`: Full depth to drill to.
150 | * `peck`: Length of each peck. (default: ctx.toolDiameter)
151 |
152 | ##### `ctx.lathe(x, y, attack, pitch, ccw)`
153 | Turning, boring, and facing by controlling XYA to remove the current path as if it were the cross section of a cylinder centered about (0,0). The path is clipped to the bottom right quadrant (x > 0 and y > 0).
154 |
155 | * `attack`: 'inner', 'outer', or 'face'
156 | Use inner for boring, and outer for turning.
157 | 'inner' removes material from the center of a hole outward.
158 | 'outer' removes material from the perimeter of a cylinder inwards.
159 | 'face' removes material from the face of a cylinder through its length.
160 | * `pitch`: Distance to travel per a full rotation.
161 | * `ccw`: Counter-clockwise rotation. (default: false)
162 |
163 | ##### `ctx.latheMill(x, y, attack, pitch, ccw)`
164 | Like lathe but instead of a rotary axis it generates helixes in XYZ.
165 |
166 | * `attack`: 'inner', 'outer', or 'face'
167 | Use inner for boring, and outer for turning.
168 | 'inner' removes material from the center of a hole outward.
169 | 'outer' removes material from the perimeter of a cylinder inwards.
170 | 'face' removes material top down.
171 | 
172 |
173 | * `pitch`: Distance to travel per a full rotation.
174 | * `ccw`: Counter-clockwise rotation. (default: false)
175 |
176 | ##### `ctx.thread(x, y, attack, dmin, dmaj, pitch, start, length, ccw)`
177 | Convenience method for turning threads.
178 | Simply lathe() with a rectangular path.
179 |
180 | * `attack`: 'inner' or 'outer'
181 | * `dmin`: Minor diameter of threads.
182 | * `dmaj`: Major diameter of threads.
183 | * `pitch`: Distance between threads.
184 | * `start`: Length to beginning of threads.
185 | * `length`: Full length of threads.
186 | * `ccw`: Counter-clockwise rotation. (default: false)
187 |
188 | ##### `ctx.threadMill(x, y, attack, dmin, dmaj, pitch, start, length, ccw)`
189 | Convenience method for milling threads.
190 | Simply latheMill() with a rectangular path.
191 |
192 | * `attack`: 'inner' or 'outer'
193 | * `dmin`: Minor diameter of threads.
194 | * `dmaj`: Major diameter of threads.
195 | * `pitch`: Distance between threads.
196 | * `start`: Length to beginning of threads.
197 | * `length`: Full length of threads.
198 | * `ccw`: Counter-clockwise rotation. (default: false)
199 |
200 | Example:
201 | ```
202 | // M8x1.25 inner threads 10mm deep
203 |
204 | // Metric thread standard precise calculation
205 | // http://en.wikipedia.org/wiki/ISO_metric_screw_thread
206 | var dmin = 8-2*5/8*Math.sqrt(3)/2*1.25;
207 |
208 | // Note: Most commerical metric screws I've measured aren't
209 | // even close to the standard. Manufacturers seem to put huge
210 | // tolerances in them so they fit almost anywhere.
211 |
212 | step('base hole', function() {
213 | ctx.toolDiameter = 1/4*25.4;
214 | ctx.fillCircle(0,0,dmin,12);
215 | });
216 |
217 | step('thread mill', function() {
218 | // Single thread cutter.
219 | ctx.toolDiameter = 1/4*25.4;
220 | ctx.threadMill(0,0,'inner',dmin-0.1,8,1.25,0,10);
221 | // Note: We subtract 0.1 just to afford us tolerance.
222 | // since the true Dmin is determined by the base hole.
223 | });
224 | ```
225 |
226 | ##### `ctx.text(text, x, y)`
227 | Adds text to the path.
228 | For some reason standard Canvas only has fillText and strokeText.
229 | I don't know why. That makes it impossible to use winding rules.
230 |
231 | ##### `ctx.circle(x, y, radius)`
232 | Convenience method for full 2pi arc().
233 |
234 | ##### `ctx.fillRect(x, y, width, height, depth)`
235 | Standard canvas fillRect() with additional depth.
236 |
237 | ##### `ctx.fillCircle(x, y, width, height, depth)`
238 | Convenience method to fill a circle to depth just like fillRect().
239 |
240 |
241 | ### gcanvas(1)
242 | Gcanvas comes with a command line utility that you can use to write standalone Javascript CNC jobs. Just define a `main(context)` function in the script, and gcanvas will pass it a
243 | pre-built context that outputs to stdout.
244 |
245 | ```
246 | // helloworld.js
247 | function main(ctx) {
248 | ctx.strokeText("Hello World");
249 | }
250 | ```
251 | ```
252 | $ gcanvas helloworld.js | mycnc
253 | ```
254 |
255 | #### Setups and tool changes
256 |
257 | gcanvas(1) exposes a global function `step(name, fn)` which prompts for user
258 | intervention and raises the Z axis to 0.
259 |
260 | If the part requires multiple work setups and tool changes, break them into setup blocks:
261 |
262 | ```
263 | step('1/2" endmill', function(ctx) {
264 | ctx.toolDiameter = 1/2*25.4;
265 | // ...
266 | });
267 |
268 | step('face down', function(ctx) {
269 | // ...
270 | });
271 | ```
272 |
273 | ### As a library
274 | ```
275 | var Gcanvas = require('gcanvas');
276 |
277 | var driver = new Gcanvas.GcodeDriver({
278 | write: function(cmd) {
279 | console.log(cmd);
280 | }
281 | });
282 |
283 | var ctx = new Gcanvas(driver);
284 | ```
285 |
286 | ### Why
287 | 1. Most real life machining is either simple 2.5D shapes,
288 | or complex geometry. Both of which are easier to do this way than with traditional CAD/CAM software. It breaks down with moderately complex 3D geometry that is not based on mathematic formulas.
289 | 2. The Canvas API is well documented and prolific.
290 | 3. Especially good for parametric parts.
291 | 4. A good basis for implementing more specific Javascript milling tools. e.g. svg, pcbs.
292 |
293 |
294 | ### Additional Notes
295 |
296 | #### Center cutting and non-center cutting endmills.
297 | The strategy for filling always tries to avoid center cutting
298 | unless it is unavoidable. For instance, if you try to fill a 15mm circle with a 5mm endmill it will start by milling a 10mm circle and finish with a full 15mm circle, which can be done with a non-center cutting endmill. But, if you try to fill an 8mm circle with a 5mm endmill it will assume you have the right tool to do so, and proceed without caution. Just make sure that what you're telling Gcanvas to do is actually possible and you won't have any problems. It always tends to work out that we use the simplest tool for the job - mainly because they are cheaper. Knowing this, Gcanvas avoids a lot of annoying configuration by making the most conservative assumptions.
299 |
300 | #### Climb milling
301 | Gcanvas always tries to climb mill. Since it doesn't know the stock material, it sort of "guesses". But the guesses are pretty reliable.
302 | It bases what the outside or inside of the material is on alignment. If you do an outer stroke() it will always normalize and follow the path clockwise, or counter-clockwise for inner stroke().
303 |
304 | In the case of lathe()/latheMill() 'inner' and 'outer' attack also
305 | always determine clockwise or counter-clockwise rotational direction.
306 | The physical thread direction is acheived by how the cutter traverses the length, one end to another.
307 |
308 | ### License
309 |
310 | MIT
311 |
312 | [](https://drone.io/github.com/em/gcanvas/latest)
313 |
--------------------------------------------------------------------------------
/lib/subpath.js:
--------------------------------------------------------------------------------
1 | /**
2 | * Derived from code originally written by zz85 for three.js
3 | * http://www.lab4games.net/zz85/blog
4 | * Thanks zz85!
5 | **/
6 |
7 | module.exports = SubPath;
8 |
9 | var Point = require('./math/point')
10 | , ClipperLib = require('./clipper')
11 | , Path = require('./path')
12 | , utils = require('./utils');
13 |
14 | function SubPath( points ) {
15 | this.actions = [];
16 | this.pointsCache = [];
17 |
18 | if ( points ) {
19 | this.fromPoints( points );
20 | }
21 | };
22 |
23 | SubPath.actions = {
24 | MOVE_TO: 'moveTo',
25 | LINE_TO: 'lineTo',
26 | QUADRATIC_CURVE_TO: 'quadraticCurveTo',
27 | BEZIER_CURVE_TO: 'bezierCurveTo',
28 | ELLIPSE: 'ellipse'
29 | };
30 |
31 | SubPath.prototype = {
32 | clone: function() {
33 | var path = new SubPath();
34 | path.actions = this.actions.slice(0);
35 | return path;
36 | }
37 |
38 | , isClosed: function() {
39 | var fp = this.firstPoint();
40 | var lp = this.lastPoint();
41 | return utils.samePos(fp,lp);
42 | }
43 |
44 | , offset: function(delta) {
45 | var tmp = this.toPath().offset(delta);
46 | if(!tmp) return false;
47 | return tmp.subPaths[0];
48 | }
49 |
50 | , simplify: function() {
51 | var tmp = this.toPath().simplify();
52 | if(!tmp) return false;
53 | return tmp.subPaths[0];
54 | }
55 |
56 | , toPath: function() {
57 | var clone = this.clone();
58 | var path = new Path();
59 | path.subPaths.push(clone);
60 | path.current = path.subPaths[path.subPaths.length-1];
61 | return path;
62 | }
63 |
64 | , addAction: function(action) {
65 | this.actions.push(action);
66 | this.pointsCache = [];
67 | }
68 |
69 | , firstPoint: function() {
70 | var p = new Point(0,0);
71 | var action = this.actions[0];
72 | var args = action.args;
73 |
74 | switch(action.action) {
75 | case 'ellipse':
76 | p = utils.arcToPoints(
77 | args[0], args[1], args[4],
78 | args[5], args[2]).start
79 | break;
80 |
81 | default:
82 | p.x = args[args.length-2];
83 | p.y = args[args.length-1];
84 | break;
85 | }
86 |
87 | return p;
88 | }
89 |
90 | , lastPoint: function() {
91 | var p = new Point(0,0);
92 | var action = this.actions[this.
93 | actions.length-1];
94 | var args = action.args;
95 |
96 | switch(action.action) {
97 | case 'ellipse':
98 | p = utils.arcToPoints(
99 | args[0], args[1], args[4],
100 | args[5], args[2]).end
101 | break;
102 |
103 | default:
104 | p.x = args[args.length-2];
105 | p.y = args[args.length-1];
106 | break;
107 | }
108 |
109 | return p;
110 | }
111 |
112 | , fromPoints: function ( points ) {
113 | this.moveTo( points[ 0 ].x, points[ 0 ].y );
114 |
115 | for ( var v = 1, vlen = points.length; v < vlen; v ++ ) {
116 | this.lineTo( points[ v ].x, points[ v ].y );
117 | };
118 | }
119 |
120 | , getActionLength: function(x0,y0,i) {
121 | var action = this.actions[i],
122 | args = action.args;
123 |
124 | if(action.action == 'ellipse') {
125 | var rad = args[3];
126 | var astart = args[4];
127 | var aend = args[5];
128 |
129 | return (aend-astart)*rad;
130 | }
131 |
132 | var x = args[args.length-2];
133 | var y = args[args.length-1];
134 | var xo = x - x0;
135 | var yo = y - y0;
136 | return Math.sqrt(xo*xo + yo*yo);
137 | }
138 |
139 | , getLength: function() {
140 | var args, x1=0, y1=0, x2=0, y2=0, xo=0, yo=0, len=0;
141 |
142 | var first = this.firstPoint();
143 | x2 = first.x;
144 | y2 = first.y;
145 |
146 | var pts = this.getPoints(10000);
147 | for(var i=1,l=pts.length; i < l; ++i) {
148 | var p=pts[i];
149 | x1 = x2;
150 | y1 = y2;
151 | x2 = p.x;
152 | y2 = p.y;
153 | xo = x2-x1;
154 | yo = y2-y1;
155 |
156 | len += Math.sqrt(xo*xo + yo*yo);
157 | }
158 | return len;
159 | }
160 |
161 | , nearestPoint: function(p1) {
162 | var p2 = new Point()
163 | , args
164 | , rn
165 | , rp
166 | , rd = Infinity;
167 |
168 | this.actions.forEach(function(action,n) {
169 | args = action.args;
170 | p2.x = args[args.length-2];
171 | p2.y = args[args.length-1];
172 |
173 | var d = Point.distance(p1,p2);
174 | if(d < rd) {
175 | rn = n;
176 | rp = p2.clone();
177 | rd = d;
178 | }
179 | });
180 |
181 | return {
182 | i: rn
183 | , distance: rd
184 | , point: rp
185 | };
186 | }
187 |
188 | , pointAt: function(i) {
189 | var p = new Point();
190 | var action = this.actions[i];
191 | var args = action.args;
192 | switch(action.action) {
193 | case 'lineTo':
194 | p.x = args[args.length-2];
195 | p.y = args[args.length-1];
196 | break;
197 |
198 | }
199 |
200 | return p;
201 | }
202 |
203 | , shiftToNearest: function(x, y) {
204 | var nearest = this.nearestPoint(new Point(x,y));
205 | return this.shift(nearest.i);
206 | }
207 |
208 | , shift: function(an) {
209 | if(an === 0) return this;
210 |
211 | var result = new SubPath();
212 |
213 |
214 | result.actions = this.actions.slice(an).concat(
215 | this.actions.slice(0,an)
216 | );
217 |
218 | result.actions.forEach(function(a) {
219 | a.action = SubPath.actions.LINE_TO;
220 | });
221 |
222 | result.lineTo.apply(result, result.actions[0].args);
223 |
224 | return result;
225 | }
226 |
227 | , moveTo: function ( x, y ) {
228 | this.addAction( { action: SubPath.actions.MOVE_TO, args: arguments } );
229 | }
230 |
231 | , lineTo: function ( x, y ) {
232 | this.addAction( { action: SubPath.actions.LINE_TO, args: arguments } );
233 | }
234 |
235 | , quadraticCurveTo: function( aCPx, aCPy, aX, aY ) {
236 | this.addAction( { action: SubPath.actions.QUADRATIC_CURVE_TO, args: arguments } );
237 | }
238 |
239 | , bezierCurveTo: function( aCP1x, aCP1y,
240 | aCP2x, aCP2y,
241 | aX, aY ) {
242 | this.addAction( { action: SubPath.actions.BEZIER_CURVE_TO, args: arguments } );
243 | }
244 |
245 | , arc: function ( aX, aY, aRadius, aStartAngle, aEndAngle, aClockwise ) {
246 | this.ellipse(aX, aY, aRadius, aRadius, aStartAngle, aEndAngle, aClockwise);
247 | }
248 |
249 | , ellipse: function ( aX, aY, xRadius, yRadius, aStartAngle, aEndAngle, aClockwise ) {
250 | this.addAction( { action: SubPath.actions.ELLIPSE, args: arguments } );
251 | }
252 |
253 | , getPoints: function( divisions ) {
254 |
255 | divisions = divisions || 40;
256 |
257 | if(this.pointsCache[divisions]) {
258 | return this.pointsCache[divisions];
259 | }
260 |
261 |
262 | var points = [];
263 |
264 | var i, il, item, action, args;
265 | var cpx, cpy, cpx2, cpy2, cpx1, cpy1, cpx0, cpy0,
266 | laste, j,
267 | t, tx, ty;
268 |
269 | for ( i = 0, il = this.actions.length; i < il; i ++ ) {
270 |
271 | item = this.actions[ i ];
272 |
273 | action = item.action;
274 | args = item.args;
275 |
276 | switch( action ) {
277 |
278 | case SubPath.actions.MOVE_TO:
279 |
280 | points.push( new Point( args[ 0 ], args[ 1 ] ) );
281 |
282 | break;
283 |
284 | case SubPath.actions.LINE_TO:
285 |
286 | points.push( new Point( args[ 0 ], args[ 1 ] ) );
287 |
288 | break;
289 |
290 | case SubPath.actions.QUADRATIC_CURVE_TO:
291 |
292 | cpx = args[ 2 ];
293 | cpy = args[ 3 ];
294 |
295 | cpx1 = args[ 0 ];
296 | cpy1 = args[ 1 ];
297 |
298 | if ( points.length > 0 ) {
299 |
300 | laste = points[ points.length - 1 ];
301 |
302 | cpx0 = laste.x;
303 | cpy0 = laste.y;
304 |
305 | } else {
306 |
307 | laste = this.actions[ i - 1 ].args;
308 |
309 | cpx0 = laste[ laste.length - 2 ];
310 | cpy0 = laste[ laste.length - 1 ];
311 |
312 | }
313 |
314 | for ( j = 1; j <= divisions; j ++ ) {
315 |
316 | t = j / divisions;
317 |
318 | tx = b2( t, cpx0, cpx1, cpx );
319 | ty = b2( t, cpy0, cpy1, cpy );
320 |
321 | points.push( new Point( tx, ty ) );
322 |
323 | }
324 |
325 | break;
326 |
327 | case SubPath.actions.BEZIER_CURVE_TO:
328 |
329 | cpx = args[ 4 ];
330 | cpy = args[ 5 ];
331 |
332 | cpx1 = args[ 0 ];
333 | cpy1 = args[ 1 ];
334 |
335 | cpx2 = args[ 2 ];
336 | cpy2 = args[ 3 ];
337 |
338 | if ( points.length > 0 ) {
339 |
340 | laste = points[ points.length - 1 ];
341 |
342 | cpx0 = laste.x;
343 | cpy0 = laste.y;
344 |
345 | } else {
346 |
347 | laste = this.actions[ i - 1 ].args;
348 |
349 | cpx0 = laste[ laste.length - 2 ];
350 | cpy0 = laste[ laste.length - 1 ];
351 |
352 | }
353 |
354 | for ( j = 1; j <= divisions; j ++ ) {
355 |
356 | t = j / divisions;
357 |
358 | tx = b3( t, cpx0, cpx1, cpx2, cpx );
359 | ty = b3( t, cpy0, cpy1, cpy2, cpy );
360 |
361 | points.push( new Point( tx, ty ) );
362 |
363 | }
364 |
365 | break;
366 |
367 | case SubPath.actions.ELLIPSE:
368 |
369 | var aX = args[ 0 ], aY = args[ 1 ],
370 | xRadius = args[ 2 ],
371 | yRadius = args[ 3 ],
372 | aStartAngle = args[ 4 ], aEndAngle = args[ 5 ],
373 | aClockwise = !!args[ 6 ];
374 |
375 | var deltaAngle = aEndAngle - aStartAngle;
376 | var angle;
377 |
378 | for ( j = 0; j <= divisions; j ++ ) {
379 | t = j / divisions;
380 |
381 | if(deltaAngle === -Math.PI*2) {
382 | deltaAngle = Math.PI*2;
383 | }
384 |
385 | if(deltaAngle < 0) {
386 | deltaAngle += Math.PI*2;
387 | }
388 |
389 | if(deltaAngle > Math.PI*2) {
390 | deltaAngle -= Math.PI*2;
391 | }
392 |
393 | if ( aClockwise ) {
394 | // sin(pi) and sin(0) are the same
395 | // So we have to special case for full circles
396 | if(deltaAngle === Math.PI*2) {
397 | deltaAngle = 0;
398 | }
399 |
400 | angle = aEndAngle + ( 1 - t ) * ( Math.PI * 2 - deltaAngle );
401 | } else {
402 | angle = aStartAngle + t * deltaAngle;
403 | }
404 |
405 | var tx = aX + xRadius * Math.cos( angle );
406 | var ty = aY + yRadius * Math.sin( angle );
407 |
408 | points.push( new Point( tx, ty ) );
409 |
410 | }
411 |
412 | break;
413 |
414 | } // end switch
415 | }
416 |
417 | if(this.closed) {
418 | points.push( points[ 0 ] );
419 | }
420 |
421 | // this.pointsCache[divisions] = points;
422 | return points;
423 | }
424 | , toPoly: function(scale, divisions) {
425 | return this.getPoints(divisions).map(function(p) {
426 | return {X: p.x*scale, Y: p.y*scale};
427 | });
428 | }
429 | , fromPoly: function(poly, scale) {
430 | scale = 1/scale;
431 |
432 | this.moveTo(poly[0].X*scale, poly[0].Y*scale);
433 |
434 | for(var i=1,l=poly.length; i < l; ++i) {
435 | this.lineTo(poly[i].X*scale, poly[i].Y*scale);
436 | }
437 |
438 | this.close();
439 | // todo: close properly (closePath())
440 | // this.lineTo(poly[0].X*scale, poly[0].Y*scale);
441 | return this;
442 | }
443 | , close: function() {
444 | if(this.isClosed()) return;
445 |
446 | var curStart = this.actions[0].args;
447 | this.lineTo.apply(this, curStart);
448 | }
449 | , reverse: function() {
450 | var result = new SubPath();
451 | var pts = this.getPoints().reverse();
452 | if(pts.length == 0) return result;
453 |
454 | result.moveTo(pts[0].x, pts[0].y);
455 | for(var i=1,l=pts.length; i < l; ++i) {
456 | result.lineTo(pts[i].x, pts[i].y);
457 | }
458 | return result;
459 | }
460 | };
461 |
462 |
463 | // Bezier Curves formulas obtained from
464 | // http://en.wikipedia.org/wiki/B%C3%A9zier_curve
465 |
466 | // Quad Bezier Functions
467 | function b2p0 ( t, p ) {
468 | var k = 1 - t;
469 | return k * k * p;
470 | }
471 |
472 | function b2p1 ( t, p ) {
473 | return 2 * ( 1 - t ) * t * p;
474 | }
475 |
476 | function b2p2 ( t, p ) {
477 | return t * t * p;
478 | }
479 |
480 | function b2 ( t, p0, p1, p2 ) {
481 | return b2p0( t, p0 ) + b2p1( t, p1 ) + b2p2( t, p2 );
482 | }
483 |
484 | // Cubic Bezier Functions
485 | function b3p0 ( t, p ) {
486 | var k = 1 - t;
487 | return k * k * k * p;
488 | }
489 |
490 | function b3p1 ( t, p ) {
491 | var k = 1 - t;
492 | return 3 * k * k * t * p;
493 | }
494 |
495 | function b3p2 ( t, p ) {
496 | var k = 1 - t;
497 | return 3 * k * t * t * p;
498 | }
499 |
500 | function b3p3 ( t, p ) {
501 | return t * t * t * p;
502 | }
503 |
504 | function b3 ( t, p0, p1, p2, p3 ) {
505 | return b3p0( t, p0 ) + b3p1( t, p1 ) + b3p2( t, p2 ) + b3p3( t, p3 );
506 | }
507 |
--------------------------------------------------------------------------------
/lib/path.js:
--------------------------------------------------------------------------------
1 | module.exports = Path;
2 |
3 | var SubPath = require('./subpath')
4 | , ClipperLib = require('./clipper')
5 | , utils = require('./utils')
6 | , Point = require('./math/point')
7 |
8 | function Path() {
9 | this.subPaths = [];
10 | }
11 |
12 | Path.actions = SubPath.actions;
13 |
14 | Path.prototype = {
15 | clone: function() {
16 | var copy = new Path();
17 | copy.subPaths = this.subPaths.slice(0);
18 | return copy;
19 | }
20 | , moveTo: function(x,y) {
21 | var subPath = new SubPath();
22 | subPath.moveTo(x,y);
23 | this.subPaths.push(subPath);
24 | this.current = subPath;
25 | }
26 | , _ensure: function(x,y) {
27 | if(this.subPaths.length === 0) {
28 | this.moveTo(x,y);
29 | }
30 | }
31 |
32 | , close: function() {
33 | if(!this.current) return false;
34 | this.current.close();
35 | }
36 |
37 | /*
38 | * Pass all curves straight through
39 | * */
40 | , lineTo: function(x,y) {
41 | this._ensure(x,y);
42 | this.current.lineTo.apply(this.current, arguments);
43 | }
44 | , arc: function(x, y, rad,
45 | astart, aend, ccw) {
46 | this.ellipse(x,y,rad,rad,astart,aend,ccw);
47 | }
48 | , ellipse: function(x, y, xrad, yrad,
49 | astart, aend, ccw) {
50 |
51 | var points = utils.arcToPoints(x, y,
52 | astart,
53 | aend,
54 | xrad);
55 |
56 | // this._ensure(points.start.x, points.start.y);
57 |
58 | if(!this.current || !utils.samePos(this.current.lastPoint(), points.start)) {
59 | this.lineTo(points.start.x, points.start.y);
60 | }
61 |
62 | this.current.ellipse.apply(this.current, arguments);
63 | }
64 | , quadraticCurveTo: function() {
65 | this.current.quadraticCurveTo.apply(this.current, arguments);
66 | }
67 | , bezierCurveTo: function() {
68 | this.current.bezierCurveTo.apply(this.current, arguments);
69 | }
70 | , rect: function(x,y,w,h) {
71 | this.moveTo(x,y);
72 | this.lineTo(x+w,y);
73 | this.lineTo(x+w,y+h);
74 | this.lineTo(x,y+h);
75 | this.lineTo(x,y);
76 | }
77 |
78 | , toPolys: function(scale,divisions) {
79 | if(!scale) throw 'NO SCALE!';
80 |
81 | return this.subPaths.map(function(subPath) {
82 | return subPath.toPoly(scale,divisions);
83 | });
84 | }
85 | , fromPolys: function(polygons, scale) {
86 | if(!scale) throw 'NO SCALE!';
87 |
88 | this.subPaths = [];
89 |
90 | for(var i=0,l=polygons.length; i < l; ++i) {
91 | var subPath = new SubPath();
92 | subPath.fromPoly(polygons[i], scale);
93 | this.subPaths.push(subPath);
94 | this.current = subPath;
95 | }
96 |
97 | return this;
98 | }
99 | , clip: function(clipRegion, clipType, divisions) {
100 | if(!clipRegion) return this;
101 |
102 | clipType = clipType || 0;
103 |
104 | var scale = 1000;
105 |
106 | // this.close();
107 | // clipRegion.close();
108 |
109 | var subjPolys = this.toPolys(scale, divisions);
110 | var clipPolys = clipRegion.toPolys(scale);
111 |
112 | // Clean both
113 | // var subjPolys = ClipperLib.Clipper.CleanPolygons(subjPolys, 1);
114 | // var clipPolys = ClipperLib.Clipper.CleanPolygons(clipPolys, 1);
115 |
116 | // var subjPolys = ClipperLib.Clipper.SimplifyPolygons(subjPolys, ClipperLib.PolyFillType.pftNonZero);
117 |
118 | // var clipPolys = ClipperLib.Clipper.SimplifyPolygons(clipPolys, ClipperLib.PolyFillType.pftNonZero);
119 |
120 | var cpr = new ClipperLib.Clipper();
121 | // cpr.PreserveCollinear = true;
122 | // cpr.ReverseSolution = true;
123 |
124 | cpr.AddPaths(subjPolys, ClipperLib.PolyType.ptSubject,true);
125 | cpr.AddPaths(clipPolys, ClipperLib.PolyType.ptClip, true);
126 |
127 | var clipped = [];
128 | cpr.Execute(clipType, clipped);
129 |
130 | var tmp;
131 |
132 | var path = new Path();
133 | path.fromPolys(clipped, scale);
134 | return path;
135 | }
136 |
137 | , translate: function(x,y) {
138 | var result = new Path();
139 | this.subPaths.forEach(function(subPath) {
140 | var pts = subPath.getPoints();
141 | result.moveTo(pts[0].x+x, pts[0].y+y);
142 | pts.slice(1).forEach(function(p) {
143 | // p.x += x;
144 | // p.y += y;
145 | result.lineTo(p.x+x, p.y+y);
146 | });
147 | });
148 | return result;
149 | }
150 |
151 | , clipToBounds: function(bounds) {
152 | var result = new Path();
153 | var p0 = new Point(0,0,0);
154 | var p0u = p0.clone();
155 | var p1u;
156 |
157 | this.subPaths.forEach(function(subPath) {
158 | var pts = subPath.getPoints();
159 |
160 | pts.forEach(function(p1, i) {
161 | p1 = p1.clone();
162 | p1u = p1.clone();
163 |
164 | // if(p1.y < bounds.top && p0.y < bounds.top) {
165 | // return;
166 | // }
167 | // if(p1.x > bounds.right && p0.x > bounds.right) {
168 | // return;
169 | // }
170 |
171 | if(p1.y < bounds.top) {
172 | var m = (p1.x - p0.x) / (p1.y - p0.y);
173 | p1.x += (m * (bounds.top - p1.y)) || 0;
174 | p1.y = bounds.top;
175 |
176 |
177 | }
178 | else if(p0u.y < bounds.top) {
179 | var m = (p1.x - p0u.x) / (p1.y - p0u.y);
180 | var x = (m * (bounds.top - p1.y)) || 0;
181 |
182 | result.moveTo(p1.x+x, bounds.top);
183 | }
184 |
185 | // if(p1.x < bounds.left) {
186 | // var m = (p1.y - p0.y) / (p1.x - p0.x);
187 | // p1.y += m * (bounds.left - p1.x);
188 | // p1.x = bounds.left;
189 | // }
190 | // else if(p0u.x < bounds.left) {
191 | // var m = (p1.y - p0u.y) / (p1.x - p0u.x);
192 | // var y = m * (bounds.left - p1.x);
193 | // // result.moveTo(bounds.left, bounds.top);
194 | // }
195 |
196 | if(p1.x > bounds.right) {
197 | var m = (p1.y - p0.y) / (p1.x - p0.x);
198 | p1.y += m * (bounds.right - p1.x);
199 | p1.x = bounds.right;
200 |
201 | }
202 | else if(p0u.x > bounds.right) {
203 |
204 | var m = (p1.y - p0u.y) / (p1.x - p0u.x);
205 | var y = m * (bounds.right - p1.x);
206 |
207 | // result.moveTo(bounds.right, p1.y-y);
208 | }
209 |
210 |
211 | if(i === 0)
212 | result.moveTo(p1.x, p1.y);
213 | else
214 | result.lineTo(p1.x, p1.y);
215 |
216 | p0 = p1;
217 | p0u = p1u;
218 | });
219 | });
220 |
221 | return result;
222 | }
223 |
224 | , simplify: function(windingRule, divisions) {
225 |
226 | // Special case for single ellipse
227 | // just change the radius.
228 | // if(this.is('ellipse')) {
229 | // var result = new Path();
230 | // var args = this.subPaths[0].actions[1].args;
231 |
232 | // result.ellipse(
233 | // args[0],
234 | // args[1],
235 | // args[2],
236 | // args[3],
237 | // args[4],
238 | // args[5],
239 | // args[6]
240 | // );
241 |
242 | // return result;
243 | // }
244 |
245 |
246 | var scale = 1000;
247 | var polys = this.toPolys(scale, divisions);
248 | var type = ClipperLib.PolyFillType.pftNonZero;
249 |
250 | if(windingRule === 'evenodd') {
251 | type = ClipperLib.PolyFillType.pftEvenOdd;
252 | }
253 |
254 | polys = ClipperLib.Clipper.SimplifyPolygons(polys, type);
255 |
256 | var result = new Path();
257 | result.fromPolys(polys, scale);
258 |
259 | return result;
260 | }
261 |
262 | , is: function(action) {
263 | if(this.subPaths.length == 1
264 | && this.subPaths[0].actions.length == 2
265 | && this.subPaths[0].actions[1].action === action) {
266 | return true;
267 | }
268 |
269 | return false;
270 | }
271 |
272 | , offset: function(delta, divisions) {
273 | if(delta === 0) {
274 | return this;
275 | }
276 |
277 | // Special case for single ellipse
278 | // just change the radius.
279 | if(this.is('ellipse')) {
280 | var result = new Path();
281 | var args = this.subPaths[0].actions[1].args;
282 |
283 | if(args[2] + delta < 0)
284 | return false;
285 |
286 | result.ellipse(
287 | args[0],
288 | args[1],
289 | args[2] + delta,
290 | args[3] + delta,
291 | args[4],
292 | args[5],
293 | args[6]
294 | );
295 |
296 | return result;
297 | }
298 |
299 | var scale = 1000;
300 | var cleandelta = 0.1;
301 |
302 | var polygons = this.toPolys(scale, divisions);
303 |
304 | // offset
305 | var miterLimit = 1000*scale;
306 |
307 | var co = new ClipperLib.ClipperOffset();
308 | // co.PreserveCollinear = true;
309 | // co.ReverseSolution = true;
310 |
311 | co.AddPaths(polygons,
312 | ClipperLib.JoinType.jtMiter,
313 | ClipperLib.EndType.etClosedPolygon);
314 |
315 | var solution = [];
316 |
317 | try {
318 | co.Execute(solution, delta*scale);
319 | }
320 | catch(err) {
321 | return false;
322 | }
323 |
324 |
325 | if(!solution || solution.length === 0
326 | || solution[0].length === 0) return false;
327 |
328 | var result = new Path();
329 | result.fromPolys(solution, scale);
330 |
331 | result.close(); // Not sure why I need to do this now
332 | return result;
333 | }
334 |
335 | , ramp: function(depth) {
336 | }
337 |
338 | , addPath: function(path2) {
339 | this.subPaths = this.subPaths.concat(path2.subPaths);
340 | }
341 |
342 | , estimateMaxOffset: function(divisions) {
343 | var bounds = this.getBounds();
344 | var width = Math.abs(bounds.right - bounds.left)
345 | var height = Math.abs(bounds.bottom - bounds.top)
346 | var lt = Math.min(width, height) / 2;
347 |
348 | var gt = 0;
349 |
350 | for(var i = 0; i < 5; ++i) {
351 | var test = gt+(lt-gt)/2;
352 | var offset = this.offset(-test,3);
353 |
354 | if(offset) {
355 | gt = test
356 | }
357 | else {
358 | lt = test;
359 | }
360 | }
361 |
362 | return {lt: lt, gt: gt};
363 | }
364 |
365 | , fillPath: function(diameter, divisions) {
366 | var result = new Path();
367 | var overlap = Math.sin(Math.PI/4);
368 |
369 | // this.subPaths.forEach(function(sp) {
370 | // var path = sp.toPath();
371 | var path = this;
372 |
373 | var max = path.estimateMaxOffset(5).lt;
374 | max -= diameter/2;
375 |
376 | for(var i = -max; i < -diameter/2; i += diameter*overlap) {
377 | var offsetPath = path.offset(i, divisions);
378 | if(!offsetPath) break;
379 | offsetPath = offsetPath.reverse();
380 | result.addPath(offsetPath);
381 | }
382 |
383 | // Finishing pass
384 | var finish = path.offset( -diameter/2, divisions );
385 | if(finish)
386 | result.addPath( finish.reverse() );
387 | // });
388 |
389 | return result;
390 | }
391 |
392 | , connectEnds: function(diameter) {
393 | for(var i=this.subPaths.length-1; i > 0; --i) {
394 | var sp1 = this.subPaths[i-1];
395 | var sp2 = this.subPaths[i];
396 |
397 | var p1 = sp1.lastPoint();
398 | var nearest = sp2.nearestPoint(p1);
399 | var p2 = nearest.point;
400 |
401 | if(nearest.distance < diameter*2) {
402 | sp2 = sp2.shift(nearest.i);
403 | sp1.lineTo(p2.x, p2.y);
404 | sp2.actions[0].action = Path.actions.LINE_TO;
405 | sp1.actions = sp1.actions.concat( sp2.actions );
406 | this.subPaths.splice(i,1);
407 | }
408 | }
409 |
410 | return this;
411 | }
412 |
413 | , reverse: function() {
414 | if(this.is('ellipse')) {
415 | var result = new Path();
416 | var args = this.subPaths[0].actions[1].args;
417 |
418 | result.ellipse(
419 | args[0],
420 | args[1],
421 | args[2],
422 | args[3],
423 | args[5], // end as start
424 | args[4], // start as end
425 | !args[6] // invert ccw
426 | );
427 |
428 | return result;
429 | }
430 |
431 | var result = new Path();
432 |
433 | result.subPaths = this.subPaths.map(function(sp) {
434 | return sp.reverse();
435 | }).reverse();
436 |
437 | return result;
438 | }
439 |
440 | , sort: function() {
441 | if(this.subPaths.length === 0) return this;
442 |
443 | var copy = new Path();
444 |
445 | var p0 = this.subPaths[0].lastPoint();
446 |
447 | copy.subPaths = this.subPaths.sort(function(a, b) {
448 | var p1 = a.lastPoint();
449 | var p2 = b.firstPoint();
450 |
451 | var d1 = Point.distance(p1,p0);
452 | var d2 = Point.distance(p2,p0);
453 |
454 | // Moving target
455 | p0 = b.lastPoint();
456 |
457 | if(d1 < d2) return -1;
458 | if(d1 > d2) return 1;
459 |
460 | return 0;
461 | });
462 |
463 | return copy;
464 | }
465 |
466 | , firstPoint: function() {
467 | if(!this.current) return false;
468 | return this.subPaths[0].firstPoint();
469 | }
470 |
471 | , lastPoint: function() {
472 | if(!this.current) return false;
473 | return this.subPaths[this.subPaths.length-1].lastPoint();
474 | }
475 |
476 | , getPoints: function(divisions) {
477 | var pts = [];
478 | this.subPaths.forEach(function(sp) {
479 | pts.push.apply(pts, sp.getPoints(divisions));
480 | });
481 | return pts;
482 | }
483 |
484 | , getBounds: function() {
485 | var pts = this.getPoints();
486 | var p0 = this.firstPoint();
487 | var res = {
488 | left: p0.x,
489 | top: p0.y,
490 | right: p0.x,
491 | bottom: p0.y
492 | };
493 |
494 | pts.forEach(function(p) {
495 | res.left = Math.min(res.left, p.x);
496 | res.top = Math.min(res.top, p.y);
497 | res.right = Math.max(res.right, p.x);
498 | res.bottom = Math.max(res.bottom, p.y);
499 | });
500 |
501 | return res;
502 | }
503 | }
504 |
505 | var NON_ZERO = ClipperLib.PolyFillType.pftNonZero;
506 | var EVEN_ODD = ClipperLib.PolyFillType.pftEvenOdd;
507 |
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/lib/gcanvas.js:
--------------------------------------------------------------------------------
1 | module.exports = GCanvas;
2 |
3 | var Path = require('./path')
4 | , Motion = require('./motion')
5 | , GcodeDriver = require('./drivers/gcode')
6 | , NullDriver = require('./drivers/null')
7 | , Point = require('./math/point')
8 | , Matrix = require('./math/matrix')
9 | , Font = require('./font')
10 | , parseFont = require('./parsefont')
11 | , utils = require('./utils');
12 |
13 | function GCanvas(driver, width, height) {
14 | var self = this;
15 | this.canvas = {
16 | width: width,
17 | height: height,
18 | getContext: function() {
19 | return self;
20 | }
21 | };
22 |
23 | if(driver === null) {
24 | driver = new NullDriver();
25 | }
26 |
27 | this.font = "7pt Helvetiker";
28 | this.matrix = new Matrix();
29 | this.rotation = 0;
30 | this.depth = 0;
31 | this.depthOfCut = 0;
32 | this.top = 0;
33 | this.retract = 0;
34 | this.align = 'center';
35 | this.driver = driver || new GcodeDriver();
36 | this.driver.src = this;
37 | this.stack = [];
38 | this.motion = new Motion(this);
39 | this.filters = [];
40 | this.precision = 20;
41 | this.ramping = true;
42 | this.strokeStyle = '#000000';
43 | this.fillStyle = '#000000';
44 |
45 | if(this.driver.init)
46 | this.driver.init();
47 |
48 | this.beginPath();
49 | }
50 |
51 | GCanvas.prototype = {
52 | save: function() {
53 | this.stack.push({
54 | matrix: this.matrix.clone(),
55 | font: this.font,
56 | speed: this.speed,
57 | feed: this.feed,
58 | depth: this.depth,
59 | depthOfCut: this.depthOfCut,
60 | toolDiameter: this.toolDiameter,
61 | align: this.align,
62 | top: this.top,
63 | filters: this.filters.slice(),
64 | strokeStyle: this.strokeStyle,
65 | fillStyle: this.fillStyle
66 | });
67 | }
68 | , restore: function() {
69 | var prev = this.stack.pop();
70 | for(var k in prev) {
71 | if(prev.hasOwnProperty(k)) {
72 | this[k] = prev[k];
73 | }
74 | }
75 | }
76 | , filter: function(fn) {
77 | this.filters.push(fn);
78 | }
79 | , map: function(from, to) {
80 | if(arguments.length == 1) {
81 | to = from;
82 | from = 'xyza';
83 | }
84 |
85 | from = from.split('');
86 | to = to.split('');
87 |
88 | this.filter(function(p) {
89 | var tmp = {};
90 | var negative = false;
91 | var i = 0;
92 |
93 | to.forEach(function(d) {
94 | if(d == '-') {
95 | negative = true;
96 | }
97 | else {
98 | tmp[d] = p[ from[i] ];
99 |
100 | if(tmp[d] != undefined && negative) {
101 | tmp[d] = -tmp[d];
102 | }
103 |
104 | negative = false;
105 | i++;
106 | }
107 | });
108 |
109 | return tmp;
110 | });
111 | }
112 | , beginPath: function() {
113 | // this.prevsubPaths = this.subPaths;
114 | this.path = new Path();
115 | // this.subPaths = [this.path];
116 | }
117 | , _restorePath: function() {
118 | this.subPaths = this.prevsubPaths;
119 | this.path = this.subPaths[this.subPaths.length-1] || new Path();
120 | }
121 | , transform: function(a, b, c, d, e, f) {
122 | this.matrix = this.matrix.concat(
123 | new Matrix(a, b, c, d, e, f)
124 | );
125 | }
126 | , setTransform: function(a, b, c, d, e, f) {
127 | this.matrix = new Matrix(a, b, c, d, e, f);
128 | }
129 | , resetTransform: function() {
130 | this.matrix = new Matrix();
131 | }
132 | , rotate: function(angle) {
133 | this.matrix = this.matrix.rotate(angle);
134 | }
135 | , translate: function(x,y) {
136 | this.matrix = this.matrix.translate(x,y);
137 | }
138 | , scale: function(x,y) {
139 | this.matrix = this.matrix.scale(x,y);
140 | }
141 | // TODO: clean up
142 | , _transformPoint: function(a, i) {
143 | i = i || 0;
144 | if(a.length) {
145 | var v = new Point(a[i], a[i+1]);
146 | v = this.matrix.transformPoint(v);
147 | a[i] = v.x;
148 | a[i+1] = v.y;
149 | }
150 | else if(a.x !== undefined) {
151 | var v = new Point(a.x, a.y);
152 | v = this.matrix.transformPoint(v);
153 | a.x = v.x;
154 | a.y = v.y;
155 | }
156 | }
157 | , _ensurePath: function(x,y) {
158 | if(this.path.subPaths.length === 0) {
159 | this.path.moveTo(x,y);
160 | }
161 | }
162 | , moveTo: function(x,y) {
163 | this._transformPoint(arguments);
164 | this.path.moveTo(x,y);
165 | }
166 | , lineTo: function(x,y) {
167 | this._transformPoint(arguments);
168 | this._ensurePath(x,y);
169 | this.path.lineTo(x,y);
170 | }
171 | , arcTo: function(x1, y1, x2, y2, radius) {
172 | this._transformPoint(arguments,0);
173 | this._transformPoint(arguments,2);
174 | this._ensurePath(x1,y1);
175 |
176 | var p0 = this.path.lastPoint();
177 | var p1 = new Point(x1,y1);
178 | var p2 = new Point(x2,y2);
179 | var v01 = p0.sub(p1);
180 | var v21 = p2.sub(p1);
181 |
182 | // sin(A - B) = sin(A) * cos(B) - sin(B) * cos(A)
183 | var cross = v01.x * v21.y - v01.y * v21.x;
184 |
185 | if (Math.abs(cross) < 1E-10) {
186 | // on one line
187 | this.lineTo(x1,y1);
188 | return;
189 | }
190 |
191 | var d01 = v01.magnitude();
192 | var d21 = v21.magnitude();
193 | var angle = (Math.PI - Math.abs(Math.asin(cross / (d01 * d21)))) / 2;
194 | var span = radius * Math.tan(angle);
195 | var rate = span / d01;
196 |
197 | var startPoint = new Point(
198 | p1.x + v01.x * rate,
199 | p1.y + v01.y * rate
200 | );
201 |
202 | rate = span / d21;
203 |
204 | var endPoint = new Point(
205 | p1.x + v21.x * rate,
206 | p1.y + v21.y * rate
207 | );
208 |
209 | var midPoint = new Point(
210 | (startPoint.x + endPoint.x) / 2,
211 | (startPoint.y + endPoint.y) / 2
212 | );
213 |
214 | var vm1 = midPoint.sub(p1);
215 | var dm1 = vm1.magnitude();
216 | var d = Math.sqrt(radius*radius + span*span);
217 |
218 | var centerPoint = new Point();
219 | rate = d / dm1;
220 | centerPoint.x = p1.x + vm1.x * rate;
221 | centerPoint.y = p1.y + vm1.y * rate;
222 |
223 | var arc = utils.pointsToArc(centerPoint, startPoint, endPoint);
224 |
225 | this.path.lineTo(startPoint.x, startPoint.y);
226 | this.path.arc(centerPoint.x, centerPoint.y, arc.radius, arc.start, arc.end, cross > 0);
227 | }
228 | , arc: function (x, y, radius,
229 | aStartAngle,
230 | aEndAngle,
231 | aClockwise ) {
232 |
233 | // In the conversion to points we lose the distinction
234 | // between 0 and pi2 so we must optimize out 0 here
235 | // or else they will be treated as full circles.
236 |
237 | if(aStartAngle - aEndAngle === 0) {
238 | return;
239 | }
240 |
241 | // See portal2 example
242 | if(aEndAngle-aStartAngle === -Math.PI*2)
243 | aEndAngle = Math.PI*2;
244 |
245 | var center = new Point(x, y);
246 | var points = utils.arcToPoints(x, y,
247 | aStartAngle,
248 | aEndAngle,
249 | radius);
250 |
251 | this._transformPoint(center);
252 | this._transformPoint(points.start);
253 | this._transformPoint(points.end);
254 |
255 | var res = utils.pointsToArc(center,
256 | points.start,
257 | points.end);
258 |
259 | // this._ensurePath(points.start.x, points.start.y);
260 |
261 | this.path.arc(center.x, center.y, res.radius, res.start, res.end, aClockwise);
262 |
263 | // var tmp = new Path();
264 | // tmp.moveTo(points.start.x, points.start.y);
265 | // tmp.arc(center.x, center.y, radius, res.start, res.end, aClockwise);
266 |
267 | // tmp.getPoints(40).forEach(function(p) {
268 | // this.lineTo(p.x,p.y);
269 | // },this);
270 | }
271 | , circle: function(x, y, rad, ccw) {
272 | this.arc(x, y, rad, 0, Math.PI*2, ccw);
273 | }
274 | , bezierCurveTo: function( aCP1x, aCP1y,
275 | aCP2x, aCP2y,
276 | aX, aY ) {
277 |
278 | this._transformPoint(arguments, 0);
279 | this._transformPoint(arguments, 2);
280 | this._transformPoint(arguments, 4);
281 |
282 | this.path.bezierCurveTo.apply(this.path, arguments);
283 | }
284 | , quadraticCurveTo: function( aCPx, aCPy, aX, aY ) {
285 | this._transformPoint(arguments, 0);
286 | this._transformPoint(arguments, 2);
287 |
288 | this.path.quadraticCurveTo.apply(this.path, arguments);
289 | }
290 | , clip: function() {
291 | this.clipRegion = this.path;
292 | }
293 | , rect: function(x,y,w,h) {
294 | this.moveTo(x,y);
295 | this.lineTo(x+w,y);
296 | this.lineTo(x+w,y+h);
297 | this.lineTo(x,y+h);
298 | this.closePath();
299 | }
300 | , fillRect: function(x,y,w,h,depth) {
301 | this.save();
302 | this.beginPath();
303 | this.depth = depth || this.depth;
304 | this.rect(x,y,w,h);
305 | this.fill();
306 | this.restore();
307 | }
308 | , fillCircle: function(x,y,rad,depth) {
309 | this.save();
310 | this.beginPath();
311 | this.depth = depth || this.depth;
312 | this.circle(x,y,rad);
313 | this.fill();
314 | this.restore();
315 | }
316 | , clone: function(driver) {
317 | var copy = new GCanvas(driver);
318 | this.save();
319 | copy.stack[0] = this.stack[0];
320 | copy.restore();
321 | return copy;
322 | }
323 | , measureText: function(text) {
324 | var copy = this.clone(null);
325 | copy.text(text);
326 | var b = copy.path.getBounds();
327 |
328 | b.width = b.right - b.left;
329 | b.height = b.bottom - b.top;
330 |
331 | return b;
332 | }
333 | , _isOpaque: function(color) {
334 | if(color == 'transparent') return false;
335 | if(color == 'none') return false;
336 |
337 | if(typeof color == 'string' &&
338 | color.match(/rgba\((?:.*,){3}[0\.]*\)/)) {
339 | return false;
340 | }
341 |
342 | return true;
343 | }
344 | , stroke: function(align, depth) {
345 | if(!this._isOpaque(this.strokeStyle)) return;
346 |
347 | this.save();
348 |
349 | if(typeof align === 'number') {
350 | depth = align;
351 | align = undefined;
352 | }
353 |
354 | if(depth) {
355 | this.depth = depth;
356 | }
357 |
358 | var offset = 0;
359 |
360 | align = align || this.align;
361 |
362 | if(align === 'outer') {
363 | offset = this.toolDiameter/2;
364 | }
365 | if(align === 'inner') {
366 | offset = -this.toolDiameter/2;
367 | }
368 |
369 | var path = this.path;
370 |
371 | if(align != 'center') {
372 | path = path.simplify('evenodd', this.precision);
373 | path = path.offset(offset);
374 | }
375 |
376 | if(path.subPaths)
377 | path.subPaths.forEach(function(subPath) {
378 |
379 | // Climb milling
380 | if(align == 'inner') {
381 | subPath = subPath.reverse();
382 | }
383 |
384 | this._layer(subPath, function(z) {
385 | this.motion.followPath(subPath,z);
386 | });
387 | }, this);
388 |
389 | this.motion.retract();
390 | this.restore();
391 | }
392 | , fill: function(windingRule, depth) {
393 | if(!this._isOpaque(this.fillStyle)) return;
394 |
395 | this.save();
396 |
397 | if(typeof windingRule === 'number') {
398 | depth = windingRule;
399 | windingRule = 'nonzero';
400 | }
401 |
402 | if(depth) {
403 | this.depth = depth;
404 | }
405 |
406 | if(!this.toolDiameter) {
407 | throw 'You must set context.toolDiameter to use fill()'
408 | }
409 |
410 | var path = this.path;
411 | path = path.simplify(windingRule, this.precision);
412 | path = path.clip(this.clipRegion, 0, this.precision);
413 | path = path.fillPath(this.toolDiameter, this.precision);
414 | var motion = this.motion;
415 |
416 | if(path.subPaths)
417 | path.subPaths.forEach(function(subPath) {
418 | this._layer(subPath, function(z) {
419 | this.motion.followPath(subPath, z);
420 | });
421 | }, this);
422 |
423 | this.motion.retract();
424 | this.restore();
425 | }
426 |
427 | // , outerThread: function(dmin, dmaj, depth, pitch, ccw) {
428 | // this.align = 'outer';
429 | // this.beginPath();
430 | // if(ccw) {
431 | // this.moveTo(dmin/2,depth);
432 | // this.lineTo(dmaj/2,depth);
433 | // this.lineTo(dmaj/2,0);
434 | // }
435 | // else {
436 | // this.moveTo(dmaj/2,0);
437 | // this.lineTo(dmaj/2,depth);
438 | // this.lineTo(dmin/2,depth);
439 | // }
440 | // this.spiral(pitch, ccw);
441 | // }
442 | , thread: function(x, y, attack, dmin, dmaj, pitch, start, length, ccw, virtual) {
443 | this.save();
444 | this.beginPath();
445 | this.rect(dmin/2,start,dmaj/2-dmin/2,length);
446 | this.lathe(x,y,attack, pitch, ccw, virtual);
447 | this.restore();
448 | }
449 | , threadMill: function(x, y, attack, dmin, dmaj, pitch, start, length, ccw) {
450 | return this.thread(x, y, attack, dmin, dmaj, pitch, start, length, ccw, true);
451 | }
452 | , latheMill: function(x, y, attack, pitch, ccw) {
453 | return this.lathe(x, y, attack, pitch, ccw, true);
454 | }
455 | , lathe: function(x, y, attack, pitch, ccw, virtual) {
456 |
457 | this.save();
458 |
459 | this.filter(function(p) {
460 | if(p.x != undefined)
461 | p.x += x;
462 | if(p.y != undefined)
463 | p.y += y;
464 | });
465 |
466 | var inPath = this.path;
467 | var toolR = this.toolDiameter/2 || 0;
468 |
469 | if(virtual && toolR) {
470 | if(attack == 'inner') {
471 | inPath = inPath.translate(-toolR,0);
472 | }
473 | if(attack == 'outer') {
474 | inPath = inPath.translate(toolR,0);
475 | }
476 | }
477 |
478 | var bounds = inPath.getBounds(); // Find bounds
479 | var height = bounds.bottom-bounds.top;
480 | var width = bounds.right-bounds.left;
481 | inPath = inPath.simplify();
482 |
483 | var quad = new Path();
484 | quad.rect(0,0,bounds.right,bounds.bottom);
485 | inPath = inPath.clip(quad);
486 |
487 | var path = new Path();
488 | var s = this.depthOfCut || 1000;
489 | var top = virtual ? this.top : 0;
490 |
491 | // Build waterline path
492 | // for given attack.
493 | // Each subpath is a layer.
494 | if(attack === 'face') {
495 | for(var i=s; i <= bounds.bottom; i += s) {
496 | var clip = new Path();
497 | clip.rect(0, top, width, i);
498 | var layer = inPath.clip(clip,0);
499 |
500 | layer.subPaths = layer.subPaths.map(function(sp) {
501 | sp = sp.shiftToNearest(0,0);
502 | return sp;
503 | });
504 |
505 | path.addPath(layer);
506 | }
507 | }
508 | else if(attack === 'inner') {
509 | for(var i=bounds.left; i <= bounds.right; i += s) {
510 | var clip = new Path();
511 | clip.rect(0,top,i,height-top);
512 | var layer = inPath.clip(clip,0);
513 |
514 | layer.subPaths = layer.subPaths.map(function(sp) {
515 | sp = sp.shiftToNearest(0,0);
516 | return sp;
517 | });
518 |
519 | path.addPath(layer);
520 | }
521 | }
522 | else if(attack === 'outer') {
523 | for(var i=bounds.right;; i -= s) {
524 | i = Math.max(i, bounds.left);
525 |
526 | var clip = new Path();
527 | clip.rect(i,top,bounds.right+10,height-top);
528 | var layer = inPath.clip(clip,0);
529 |
530 | layer.subPaths = layer.subPaths.map(function(sp) {
531 | sp = sp.shiftToNearest(bounds.right,0);
532 | return sp;
533 | });
534 |
535 | path.addPath(layer);
536 |
537 | if(i == bounds.left) break;
538 | }
539 | }
540 |
541 | // path.addPath(inPath);
542 |
543 | var inner = this.align == 'inner';
544 | pitch = pitch || this.toolDiameter || 1;
545 |
546 | var motion = this.motion;
547 | var driver = this.driver;
548 | // var range = (attack == 'face') ? height : width;
549 | // var depthOfCut = this.depthOfCut || range;
550 | // var offset = range;
551 | var a = 0;
552 |
553 | path.subPaths.forEach(function(subPath) {
554 | var spiralAngle = 0;
555 | driver.zero({a:0});
556 | var a = 0;
557 |
558 | var pts = subPath.getPoints();
559 |
560 | if(!ccw) {
561 | // CCW simply makes the path bottom-out.
562 | // The physical circular motion is
563 | // always determined by the attack
564 | // to ensure climb milling.
565 | pts = pts.reverse();
566 | }
567 |
568 | var p0u = motion.position;
569 | var p0 = p0u.clone();
570 |
571 | pts.forEach(function(p1,i) {
572 | p1 = p1.clone();
573 | p1u = p1.clone();
574 |
575 | var xo = p1u.x-p0u.x;
576 | var yo = p1u.y-p0u.y;
577 | var dist = Math.sqrt(xo*xo + yo*yo);
578 |
579 | if(virtual) {
580 | var r0 = p0.x;
581 | var z0 = p0.y;
582 | var r1 = p1.x;
583 | var z1 = p1.y;
584 | var loops = dist/pitch;
585 |
586 | // Entering and exiting are a part of the path
587 | // touching the bounds as a consequence
588 | // of the waterline clipping.
589 | // We just have to detect them and
590 | // behave a little differently.
591 | if(attack == 'inner' && p0.x <= bounds.left) {
592 | // Inner Entering
593 | var x = (r1) * Math.sin(spiralAngle);
594 | var y = (r1) * Math.cos(spiralAngle);
595 | if(i === 0)
596 | motion.rapid({x: x, y: y});
597 | else
598 | motion.linear({x: x, y: y});
599 |
600 | motion.rapid({z: z1});
601 | }
602 | else if(attack == 'inner' && p1.x <= bounds.left) {
603 | // Inner Exiting
604 | var x = (r1) * Math.sin(spiralAngle);
605 | var y = (r1) * Math.cos(spiralAngle);
606 | motion.rapid({x: x, y: y});
607 | motion.rapid({z: z1});
608 | }
609 | else if(attack == 'outer' && p0.x >= bounds.right) {
610 | // Outer Entering
611 | var x = (r1) * Math.cos(spiralAngle);
612 | var y = (r1) * Math.sin(spiralAngle);
613 | motion.linear({x: x, y: y});
614 | }
615 | else if(attack == 'outer' && p1.x >= bounds.right) {
616 | // Outer Exiting
617 | var x = (r1) * Math.cos(spiralAngle);
618 | var y = (r1) * Math.sin(spiralAngle);
619 | motion.rapid({x: x, y: y});
620 | motion.rapid({z: z1});
621 | }
622 | else if(attack == 'face' && p0.y <= bounds.top) {
623 | // Face Entering
624 | var x = (r1) * Math.cos(spiralAngle);
625 | var y = (r1) * Math.sin(spiralAngle);
626 | motion.rapid({x: x, y: y});
627 | motion.linear({z: z1});
628 | }
629 | else if(attack == 'face' && p1.y <= bounds.top) {
630 | // Outer Exiting
631 | var x = (r1) * Math.cos(spiralAngle);
632 | var y = (r1) * Math.sin(spiralAngle);
633 | motion.rapid({z: z1});
634 | motion.rapid({x: x, y: y});
635 | }
636 | else {
637 | spiralAngle = utils.spiral(this.precision, r0, r1, loops,
638 | spiralAngle, attack=='inner',
639 | function(x,y,t) {
640 | var z = z0+(z1-z0)*t;
641 |
642 | motion.linear({
643 | x: x,
644 | y: y,
645 | z: z
646 | });
647 | });
648 | }
649 | }
650 | else {
651 |
652 | if(attack == 'inner' && p1u.x <= bounds.left) {
653 | motion.rapid({x: p1.x, y: p1.y});
654 | }
655 | else if(attack == 'outer' && p1.x >= bounds.right) {
656 | motion.rapid({x: p1.x, y: p1.y});
657 | }
658 | else if(attack == 'face' && p1.y <= bounds.top) {
659 | motion.rapid({x: p1.x, y: p1.y});
660 | }
661 | else {
662 | a += dist/pitch*360;
663 | motion.linear({x: p1.x, y: p1.y, a: a});
664 | }
665 | }
666 |
667 | p0 = p1.clone();
668 | p0u = p1u.clone();
669 | }, this);
670 |
671 | // This is important to be done after
672 | // every subpath, for ctx.top
673 | if(virtual) {
674 | motion.rapid({z: 0});
675 | }
676 | }, this);
677 |
678 | driver.zero({a:0});
679 |
680 | // Always finish with an arc?
681 | // motion.arcCW({
682 | // x: 0,
683 | // y: 0,
684 | // i:-p1.x,
685 | // j:-p1.y
686 | // });
687 |
688 | this.restore();
689 | }
690 | , peckDrill: function(x, y, depth, peck) {
691 |
692 | this._transformPoint(arguments);
693 |
694 | if(arguments.length <= 2) {
695 | depth = arguments[0];
696 | peck = arguments[1];
697 | x = 0;
698 | y = 0;
699 | }
700 |
701 | var prevZ = this.top;
702 | var mtn = this.motion;
703 | peck = peck || this.toolDiameter;
704 |
705 | // We need a tad bit of play
706 | // to avoid rapid plunging into
707 | // the previous peck's bur
708 | // and to pull out a little further
709 | // than the surface in case it started
710 | // out too close
711 | var tad = peck/2 || depth/10;
712 |
713 | mtn.rapid({x:x,y:y});
714 |
715 | for(var z=this.top+peck; prevZ < depth; z += peck) {
716 | z = Math.min(z, depth); // Cap to exact depth
717 | mtn.rapid({z:prevZ-tad}); // Rapid to prev depth - tad
718 | mtn.linear({z:z}); // Drill a bit further
719 | mtn.retract();
720 | // mtn.rapid({z:-tad}); // Rapid all the way out
721 | prevZ = z;
722 | }
723 |
724 | mtn.retract();
725 | }
726 | , _layer: function(subPath, fn) {
727 | var depthOfCut = this.depthOfCut || this.depth;
728 |
729 | if(depthOfCut === 0) {
730 | fn.call(this, -this.top);
731 | return;
732 | }
733 |
734 | var invertedZ = this.depth < 0;
735 | if (invertedZ && depthOfCut > 0) {
736 | depthOfCut = -depthOfCut;
737 | }
738 |
739 | var steps = Math.ceil(Math.abs(this.depth/depthOfCut));
740 |
741 |
742 | var offset = -this.top;
743 | while(steps--) {
744 | offset -= depthOfCut;
745 |
746 | // Clip to actual depth
747 | if (invertedZ) {
748 | offset = Math.max(offset, this.top+this.depth);
749 | } else {
750 | offset = Math.max(offset, -this.top-this.depth);
751 | }
752 |
753 | // Remove the material at this depth
754 | fn.call(this, offset);
755 | }
756 |
757 | // Finishing pass
758 | if(this.ramping && subPath.isClosed()) {
759 | fn.call(this, offset);
760 | }
761 | }
762 | , text: function(text, x, y, params) {
763 | var fontProps = parseFont(this.font);
764 | var font = new Font(fontProps);
765 |
766 | // this.beginPath();
767 | this.save();
768 | this.translate(x, y);
769 | font.drawText(this, text);
770 | this.restore();
771 | }
772 | , fillText: function(text, x, y, params) {
773 | this.text(text, x, y, params);
774 | this.fill();
775 | }
776 | , strokeText: function(text, x, y, params) {
777 | this.text(text, x, y, params);
778 | this.stroke();
779 | }
780 | , clearRect: function() {}
781 | , closePath: function() {
782 | this.path.close();
783 | }
784 | };
785 |
786 | GCanvas.GcodeDriver = GcodeDriver;
787 |
788 | var helvetiker = require('./fonts/helvetiker_regular.typeface');
789 | Font.load(helvetiker);
790 |
791 |
--------------------------------------------------------------------------------
/lib/fonts/helvetiker_regular.typeface.js:
--------------------------------------------------------------------------------
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All Rights Reserved.\r\n\r\nPermission is hereby granted, free of charge, to any person obtaining a copy of the fonts accompanying this license (\"Fonts\") and associated documentation files (the \"Font Software\"), to reproduce and distribute the Font Software, including without limitation the rights to use, copy, merge, publish, distribute, and/or sell copies of the Font Software, and to permit persons to whom the Font Software is furnished to do so, subject to the following conditions: \r\n\r\nThe above copyright and this permission notice shall be included in all copies of one or more of the Font Software typefaces.\r\n\r\nThe Font Software may be modified, altered, or added to, and in particular the designs of glyphs or characters in the Fonts may be modified and additional glyphs or characters may be added to the Fonts, only if the fonts are renamed to names not containing the word \"MgOpen\", or if the modifications are accepted for inclusion in the Font Software itself by the each appointed Administrator.\r\n\r\nThis License becomes null and void to the extent applicable to Fonts or Font Software that has been modified and is distributed under the \"MgOpen\" name.\r\n\r\nThe Font Software may be sold as part of a larger software package but no copy of one or more of the Font Software typefaces may be sold by itself. \r\n\r\nTHE FONT SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. 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2 |
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