├── Callipers.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── simon.xcuserdatad
    │       └── xcschemes
    │           ├── Callipers.xcscheme
    │           └── xcschememanagement.plist
├── Callipers
    ├── Callipers-Info.plist
    ├── Callipers-Prefix.pch
    ├── Callipers.h
    ├── Callipers.m
    ├── CallipersOptions.xib
    ├── Info.plist
    ├── SCPathTime.h
    ├── SCPathTime.m
    └── toolbar.pdf
├── LICENSE
├── README.md
└── callipers.gif


/Callipers.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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/Callipers/Callipers-Info.plist:
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/Callipers/Callipers-Prefix.pch:
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--------------------------------------------------------------------------------
/Callipers/Callipers.h:
--------------------------------------------------------------------------------
 1 | //
 2 | //  Callipers.h
 3 | //  Callipers
 4 | //
 5 | //  Created by Simon Cozens on 19/12/2015.
 6 | //  Copyright © 2015 Simon Cozens. All rights reserved.
 7 | //
 8 | 
 9 | #import <Cocoa/Cocoa.h>
10 | #import <GlyphsCore/GlyphsToolDrawProtocol.h>
11 | #import <GlyphsCore/GlyphsToolEventProtocol.h>
12 | #import <GlyphsCore/GSToolSelect.h>
13 | #import <GlyphsCore/GSLayer.h>
14 | #import <GlyphsCore/GSPath.h>
15 | #import <GlyphsCore/GSNode.h>
16 | #import <GlyphsCore/GSGeometrieHelper.h>
17 | 
18 | #import "SCPathTime.h"
19 | 
20 | typedef enum {
21 |     DRAWING_START,
22 |     DRAWING_END
23 | } TOOL_STATE ;
24 | 
25 | typedef enum {
26 |     MEASURE_CLOSEST,
27 |     MEASURE_CORRESPONDING
28 | } MEASURE_MODE ;
29 | 
30 | @interface Callipers : GSToolSelect {
31 |     SCPathTime* segStart1;
32 |     SCPathTime* segStart2;
33 |     SCPathTime* segEnd1;
34 |     SCPathTime* segEnd2;
35 |     long cacheMin;
36 |     long cacheMax;
37 |     long cacheAvg;
38 |     TOOL_STATE tool_state;
39 |     MEASURE_MODE measure_mode;
40 |     GSLayer* currentLayer;
41 | }
42 | 
43 | - (IBAction) changeMeasureMode:(id)sender;
44 | 
45 | @property (nonatomic, weak) IBOutlet NSWindow *optionsWindow;
46 | @property (weak) IBOutlet NSSlider *stepsSlider;
47 | @property (weak) IBOutlet NSSlider *thickSlider;
48 | 
49 | @end
50 | 


--------------------------------------------------------------------------------
/Callipers/Callipers.m:
--------------------------------------------------------------------------------
  1 | //
  2 | //  Callipers.m
  3 | //  Callipers
  4 | //
  5 | //  Created by Simon Cozens on 19/12/2015.
  6 | //  Copyright © 2015 Simon Cozens. All rights reserved.
  7 | //
  8 | 
  9 | #import "Callipers.h"
 10 | #import <GlyphsCore/GSGeometrieHelper.h>
 11 | 
 12 | @implementation Callipers
 13 | 
 14 | - (id) init {
 15 | 	self = [super init];
 16 | 	NSBundle * thisBundle = [NSBundle bundleForClass:[self class]];
 17 | 	if (thisBundle) {
 18 | 		// The toolbar icon:
 19 | 		_toolBarIcon = [[NSImage alloc] initWithContentsOfFile:[thisBundle pathForImageResource: @"toolbar"]];
 20 | 		[_toolBarIcon setTemplate:YES];
 21 | 	}
 22 |     tool_state = DRAWING_START;
 23 |     measure_mode = MEASURE_CLOSEST;
 24 |     [NSBundle loadNibNamed:@"CallipersOptions" owner:self];
 25 |     [_stepsSlider setTarget:self];
 26 |     [_stepsSlider setAction:@selector(redrawTheView)];
 27 |     [_thickSlider setTarget:self];
 28 |     [_thickSlider setAction:@selector(redrawTheView)];
 29 |     
 30 |     segStart1 = [[SCPathTime alloc] init];
 31 |     segStart2 = [[SCPathTime alloc] init];
 32 |     segEnd1   = [[SCPathTime alloc] init];
 33 |     segEnd2   = [[SCPathTime alloc] init];
 34 | 
 35 | 	return self;
 36 | }
 37 | 
 38 | - (NSUInteger) interfaceVersion { return 1; }
 39 | 
 40 | - (NSUInteger) groupID { return 120; }
 41 | 
 42 | - (NSString*) title { return @"Callipers"; }
 43 | 
 44 | - (NSString*) trigger { return @"c"; }
 45 | 
 46 | - (NSInteger) tempTrigger { return 0; }
 47 | 
 48 | - (BOOL) willSelectTempTool:(id) tempTool {	return NO; }
 49 | 
 50 | - (void) mouseDown:(NSEvent*)theEvent {
 51 | 	// Called when the mouse button is clicked.
 52 |     if (!([theEvent modifierFlags] & NSEventModifierFlagOption)) {
 53 |         return [super mouseDown:theEvent];
 54 |     }
 55 | 	_editViewController = [_windowController activeEditViewController];
 56 |     currentLayer = [_editViewController.graphicView activeLayer];
 57 | 	// editViewController.graphicView.cursor = [NSCursor closedHandCursor];
 58 |     _draggStart = [_editViewController.graphicView getActiveLocation: theEvent];
 59 |     if (tool_state == DRAWING_START) {
 60 | //        NSLog(@"Clearing start");
 61 |         segStart1 = [segStart1 init];
 62 |         segStart2 = [segStart2 init];
 63 |     }
 64 | //    NSLog(@"Clearing end");
 65 |     segEnd1 = [segEnd1 init];
 66 |     segEnd2 = [segEnd2 init];
 67 |     cacheMin = 0;
 68 | //    NSLog(@"Mousedown ended");
 69 | //    NSLog(@"__mouse dragged from : %@", NSStringFromPoint(_draggStart));
 70 | }
 71 | 
 72 | - (void) mouseDragged:(NSEvent*)theEvent {
 73 | 	// Called when the mouse is moved with the primary button down.
 74 |     if (!([theEvent modifierFlags] & NSEventModifierFlagOption)) {
 75 |         return [super mouseDragged:theEvent];
 76 |     }
 77 |     NSPoint Loc = [_editViewController.graphicView getActiveLocation: theEvent];
 78 |     [_editViewController.graphicView setNeedsDisplay: TRUE];
 79 |     if ([theEvent modifierFlags] & NSShiftKeyMask) {
 80 |         CGFloat dx = fabs(Loc.x - _draggStart.x);
 81 |         CGFloat dy = fabs(Loc.y - _draggStart.y);
 82 |         if (dx < dy) {
 83 |             Loc.x = _draggStart.x;
 84 |         } else {
 85 |             Loc.y = _draggStart.y;
 86 |         }
 87 |     }
 88 |     _draggCurrent = Loc;
 89 |     _dragging = true;
 90 | }
 91 | 
 92 | - (void) mouseUp:(NSEvent*)theEvent {
 93 | 	// Called when the primary mouse button is released.
 94 | 	// editViewController.graphicView.cursor = [NSCursor openHandCursor];
 95 |     if (!([theEvent modifierFlags] & NSEventModifierFlagOption)) {
 96 |         return [super mouseUp:theEvent];
 97 |     }
 98 |     NSPoint startPoint = _draggStart;
 99 |     NSPoint endPoint   = _draggCurrent;
100 |     GSLayer* layer = [_editViewController.graphicView activeLayer];
101 |     _dragging = false;
102 |     NSMutableArray* intersections = [NSMutableArray array];
103 |     /* How many segments does my line intersect? */
104 |     for (GSPath* p in [layer paths]) {
105 |         int i =0;
106 |         NSArray* segs = [p segments];
107 |         while (i < [segs count]) {
108 |             NSArray *thisSeg = [segs objectAtIndex: i];
109 |             if ([thisSeg count] == 2) {
110 |                 // Set up line intersection
111 |                 NSPoint segstart = [[thisSeg objectAtIndex:0] pointValue];
112 |                 NSPoint segend = [[thisSeg objectAtIndex:1] pointValue];
113 |                 NSPoint pt = GSIntersectLineLine(startPoint, endPoint, segstart, segend);
114 |                 if (pt.x != NSNotFound && pt.y != NSNotFound) {
115 |                     CGFloat t = GSDistance(segstart,pt) / GSDistance(segstart, segend);
116 |                     SCPathTime *intersection = [[SCPathTime alloc] initWithPath:p SegId:i t:t];
117 |                     [intersections addObject: intersection];
118 |                 }
119 |             } else {
120 |                 NSPoint segstart = [[thisSeg objectAtIndex:0] pointValue];
121 |                 NSPoint handle1 = [[thisSeg objectAtIndex:1] pointValue];
122 |                 NSPoint handle2 = [[thisSeg objectAtIndex:2] pointValue];
123 |                 NSPoint segend = [[thisSeg objectAtIndex:3] pointValue];
124 |                 NSArray* localIntersections = GSIntersectBezier3Line(segstart, handle1, handle2, segend, startPoint, endPoint);
125 |                 for (id _pt in localIntersections) {
126 |                     NSPoint pt = [_pt pointValue];
127 |                     CGFloat t;
128 |                     [p nearestPointOnPath:pt pathTime:&t];
129 |                     t = fmod(t, 1.0);
130 |                     SCPathTime *intersection = [[SCPathTime alloc] initWithPath:p SegId:i t:t];
131 |                     [intersections addObject: intersection];
132 |                 }
133 |             }
134 |             i++;
135 |         }
136 |     }
137 | //    NSLog(@"Found %lu intersections!", (unsigned long)[intersections count]);
138 |     if ([intersections count] != 2) {
139 |         [_editViewController.graphicView setNeedsDisplay: TRUE];
140 |         return;
141 |     }
142 |     
143 |     if (tool_state == DRAWING_START) {
144 |         tool_state = DRAWING_END;
145 |         segStart1 = [intersections objectAtIndex:0];
146 |         segStart2 = [intersections objectAtIndex:1];
147 | //        NSLog(@"Setting start");
148 | //        NSLog(@"start1: %@, %lu, %g", segStart1->path, segStart1->segId, segStart1->t);
149 | //        NSLog(@"start2: %@, %lu, %g", segStart2->path, segStart2->segId, segStart2->t);
150 |     } else {
151 |         tool_state = DRAWING_START;
152 |         segEnd1 = [intersections objectAtIndex:0];
153 |         segEnd2 = [intersections objectAtIndex:1];
154 |         _dragging = false;
155 | //        NSLog(@"Setting end");
156 | //        NSLog(@"start1: %@, %lu, %g", segStart1->path, segStart1->segId, segStart1->t);
157 | //        NSLog(@"start2: %@, %lu, %g", segStart2->path, segStart2->segId, segStart2->t);
158 | //        NSLog(@"end1: %@, %lu, %g", segEnd1->path, segEnd1->segId, segEnd1->t);
159 | //        NSLog(@"end2: %@, %lu, %g", segEnd2->path, segEnd2->segId, segEnd2->t);
160 |         [_editViewController.graphicView setNeedsDisplay: TRUE];
161 |     }
162 |     
163 | }
164 | 
165 | - (void) redrawTheView {
166 |     [_editViewController.graphicView setNeedsDisplay: TRUE];
167 | }
168 | 
169 | - (void) drawBackground {
170 | 	// Draw in the background, concerns the complete view.
171 | }
172 | 
173 | - (NSPoint) minSquareDistancePoint:(NSPoint) p Curve:(SCPathTime*)c {
174 |     NSPoint best = [c point];
175 |     if (measure_mode == MEASURE_CORRESPONDING) return best;
176 |     
177 |     long bestDist = GSSquareDistance(p, best);
178 |     SCPathTime* c2 = [c copy];
179 |     while (true){
180 |         [c2 stepTimeBy:0.01];
181 |         NSPoint p2 = [c2 point];
182 |         long d = GSSquareDistance(p, p2);
183 |         if (d < bestDist) {
184 |             bestDist = d;
185 |             best = p2;
186 |         }
187 |         if (d > bestDist) break;
188 |     }
189 |     c2 = [c copy];
190 |     while (true){
191 |         [c2 stepTimeBy:-0.01];
192 |         NSPoint p2 = [c2 point];
193 |         long d = GSSquareDistance(p, p2);
194 |         if (d < bestDist) {
195 |             bestDist = d;
196 |             best = p2;
197 |         }
198 |         if (d > bestDist) break;
199 |     }
200 |     return best;
201 | }
202 | 
203 | - (CGFloat) segLength: (GSPath*)p segId:(NSInteger)segId from:(CGFloat)t1 to:(CGFloat)t2 {
204 |     NSArray* seg = p.segments[segId];
205 |     if ([ seg count] == 2) {
206 |         NSPoint start = [[seg objectAtIndex:0] pointValue];
207 |         NSPoint end = [[seg objectAtIndex:1] pointValue];
208 |         CGFloat x1 = start.x + (end.x-start.x)*fmod(t1,1.0);
209 |         CGFloat y1 = start.y + (end.y-start.y)*fmod(t1,1.0);
210 |         CGFloat x2 = start.x + (end.x-start.x)*fmod(t2,1.0);
211 |         CGFloat y2 = start.y + (end.y-start.y)*fmod(t2,1.0);
212 |         return sqrtf( (float)(((x1 - x2) * (x1 - x2)) + ((y1 - y2) * (y1 - y2))));
213 |     } else {
214 |         NSPoint o1, o2, o3, o4;
215 |         NSPoint i1 = [[seg objectAtIndex:0] pointValue];
216 |         NSPoint i2 = [[seg objectAtIndex:1] pointValue];
217 |         NSPoint i3 = [[seg objectAtIndex:2] pointValue];
218 |         NSPoint i4 = [[seg objectAtIndex:3] pointValue];
219 |         GSSegmentBetweenPoints(i1,i2,i3,i4, &o1, &o2, &o3, &o4, GSPointAtTime(i1,i2,i3,i4,t1),GSPointAtTime(i1,i2,i3,i4,t2));
220 |         return GSLengthOfSegment(o1,o2,o3,o4);
221 |     }
222 | }
223 | 
224 | - (CGFloat) pathLength: (SCPathTime*)start to: (SCPathTime*) end {
225 |     SCPathTime *p1, *p2;
226 |     if (start->segId > end->segId || (start->segId == end->segId && start->t > end->t)) {
227 |         p1 = end; p2 = start;
228 |     } else {
229 |         p1 = start; p2 = end;
230 |     }
231 |     NSInteger segId = p1->segId;
232 |     CGFloat total = 0;
233 |     CGFloat t = p1->t;
234 |     while (segId < p2->segId) {
235 |         total += [self segLength: p1->path segId:segId from:t to:1];
236 |         segId++;
237 |         t = 0;
238 |     }
239 |     total += [self segLength:p1->path segId:segId from:t to:p2->t];
240 |     return total;
241 | }
242 | 
243 | 
244 | - (void) drawForegroundForLayer:(GSLayer *)Layer {
245 | 
246 |     if (segStart1->segId == NSNotFound || segEnd1->segId == NSNotFound ||
247 |         segStart2->segId == NSNotFound || segEnd2->segId == NSNotFound ||
248 |         !segStart1->path || !segStart2->path) {
249 |         if (_dragging) {
250 |             NSBezierPath * path = [NSBezierPath bezierPath];
251 |             [path setLineWidth: 1];
252 |             [path moveToPoint: _draggStart];
253 |             [path lineToPoint: _draggCurrent];
254 |             if (tool_state == DRAWING_START) {
255 |                 [[NSColor greenColor] set];
256 |             } else { [[NSColor redColor] set]; }
257 |             [path stroke];
258 |         }
259 |         return;
260 |     }
261 | //    NSLog(@"Drawing!");
262 | 
263 |     // Measure the two paths. Swap if needed
264 |     CGFloat sl1 = [self pathLength:segStart1 to:segEnd1];
265 |     CGFloat sl2 = [self pathLength:segStart2 to:segEnd2];
266 | //    NSLog(@"Length of intersections, 1: %g, 2: %g", sl1, sl2);
267 |     if (sl1 < sl2) {
268 |         SCPathTime* ss = segStart2;
269 |         SCPathTime* se = segEnd2;
270 |         segStart2 = segStart1; segStart1 = ss;
271 |         segEnd2 = segEnd1; segEnd1 = se;
272 |     }
273 | 
274 |     int steps = [_stepsSlider intValue];
275 |     CGFloat step1 = ((segEnd1->segId + segEnd1->t) - (segStart1->segId + segStart1->t)) / steps; // XXX
276 |     CGFloat step2 = ((segEnd2->segId + segEnd2->t) - (segStart2->segId + segStart2->t)) / steps;
277 |     long maxLen, minLen, avgLen;
278 |     SCPathTime* t1, *t2;
279 | 
280 |     if (cacheMin == 0) {
281 |         minLen = 99999;
282 |         maxLen = 0;
283 |         avgLen = 0;
284 |         t1 = [segStart1 copy];
285 |         t2 = [segStart2 copy];
286 |         int actualSteps = 0;
287 |         while ([t1 compareWith: segEnd1] != copysign(1.0, step1)) {
288 |             NSPoint p1 = [t1 point];
289 |             NSPoint p2 = [self minSquareDistancePoint:p1 Curve:t2];
290 |             long dist = GSSquareDistance(p1,p2);
291 |             if (dist < minLen) minLen = dist;
292 |             if (dist > maxLen) maxLen = dist;
293 |             avgLen += dist;
294 |             [t1 stepTimeBy:step1];
295 |             [t2 stepTimeBy:step2];
296 |             actualSteps++;
297 |         }
298 |         cacheAvg = avgLen = avgLen / actualSteps;
299 |         cacheMin = minLen;
300 |         cacheMax = maxLen;
301 |     } else {
302 |         maxLen = cacheMax;
303 |         minLen = cacheMin;
304 |         avgLen = cacheAvg;
305 |     }
306 | 
307 |     t1 = [segStart1 copy];
308 |     t2 = [segStart2 copy];
309 |     while ([t1 compareWith: segEnd1] != copysign(1.0, step1)) {
310 |         NSPoint p1 = [t1 point];
311 |         NSPoint p2 = [self minSquareDistancePoint:p1 Curve:t2];
312 |         long dist = GSSquareDistance(p1,p2);
313 |         NSBezierPath * path = [NSBezierPath bezierPath];
314 |         CGFloat scale = fabs((CGFloat)maxLen-minLen);
315 |         if (scale < 5) scale = 5;
316 |         CGFloat hue = (120+((avgLen-dist)/scale*180.0))/360;
317 | //        if (hue < 0.2) hue -= 0.11;
318 |         NSColor *c = [NSColor colorWithHue:hue saturation:1.0 brightness:1.0 alpha:1];
319 |         NSLog(@"Dist: %li, hue: %g. Min: %li, avg: %li, max: %li", dist, hue, minLen, avgLen, maxLen);
320 |         [path setLineWidth: [_thickSlider intValue]];
321 |         [path moveToPoint: p1];
322 |         [path lineToPoint: p2];
323 |         [c set];
324 |         [path stroke];
325 |         [t1 stepTimeBy:step1];
326 |         [t2 stepTimeBy:step2];
327 |     }
328 | 
329 |     [super drawBackgroundForLayer:Layer];
330 | }
331 | //
332 | //- (void) drawLayer:(GSLayer*)Layer atPoint:(NSPoint)aPoint asActive:(BOOL)Active attributes:(NSDictionary*)Attributes {
333 | //	// Draw anythin for this particular layer.
334 | //    [ _editViewController.graphicView drawLayerOutlines:Layer aPoint:aPoint color:[NSColor blackColor] fill:!Active];
335 | //}
336 | 
337 | - (void) willActivate {
338 | 	// Called when the tool is selected by the user.
339 | 	// editViewController.graphicView.cursor = [NSCursor openHandCursor];
340 | //    NSLog(@"Willactivate called");
341 |     GSLayer* layer = [_editViewController.graphicView activeLayer];
342 |     if (layer != currentLayer) {
343 |         [_optionsWindow orderFront:self];
344 |         segStart1 = [segStart1 init];
345 |         segStart2 = [segStart2 init];
346 |         segEnd1 = [segEnd1 init];
347 |         segEnd2 = [segEnd2 init];
348 |     }
349 | }
350 | 
351 | - (IBAction) changeMeasureMode:(NSButton*)sender {
352 |     if ([sender tag] == 1) { measure_mode = MEASURE_CLOSEST; }
353 |     else if ([sender tag] == 2) { measure_mode = MEASURE_CORRESPONDING; }
354 |     [self redrawTheView];
355 | }
356 | 
357 | - (void) willDeactivate {
358 | 	 [_optionsWindow orderOut:self];
359 | }
360 | 
361 | @end
362 | 


--------------------------------------------------------------------------------
/Callipers/CallipersOptions.xib:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="13771" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="13771"/>
 5 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 6 |     </dependencies>
 7 |     <objects>
 8 |         <customObject id="-2" userLabel="File's Owner" customClass="Callipers">
 9 |             <connections>
10 |                 <outlet property="optionsWindow" destination="QvC-M9-y7g" id="dUi-iG-z55"/>
11 |                 <outlet property="stepsSlider" destination="Us4-ey-xd7" id="K0W-ud-AxT"/>
12 |                 <outlet property="thickSlider" destination="mtT-Ty-wSc" id="LYk-SL-G1H"/>
13 |             </connections>
14 |         </customObject>
15 |         <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
16 |         <customObject id="-3" userLabel="Application" customClass="NSWindow"/>
17 |         <window title="Callipers" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" oneShot="NO" releasedWhenClosed="NO" showsToolbarButton="NO" visibleAtLaunch="NO" animationBehavior="default" titlebarAppearsTransparent="YES" id="QvC-M9-y7g" customClass="NSPanel">
18 |             <windowStyleMask key="styleMask" titled="YES" utility="YES" nonactivatingPanel="YES"/>
19 |             <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
20 |             <rect key="contentRect" x="196" y="240" width="279" height="134"/>
21 |             <rect key="screenRect" x="0.0" y="0.0" width="1680" height="1027"/>
22 |             <view key="contentView" id="EiT-Mj-1SZ">
23 |                 <rect key="frame" x="0.0" y="0.0" width="279" height="134"/>
24 |                 <autoresizingMask key="autoresizingMask"/>
25 |                 <subviews>
26 |                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="vBv-qM-jnY">
27 |                         <rect key="frame" x="17" y="107" width="62" height="17"/>
28 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
29 |                         <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Steps" id="oeM-MR-9Ha">
30 |                             <font key="font" metaFont="system"/>
31 |                             <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
32 |                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
33 |                         </textFieldCell>
34 |                     </textField>
35 |                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="9rp-1a-iiH">
36 |                         <rect key="frame" x="17" y="76" width="95" height="17"/>
37 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
38 |                         <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" title="Line Thickness" id="f9m-yN-t25">
39 |                             <font key="font" metaFont="system"/>
40 |                             <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
41 |                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
42 |                         </textFieldCell>
43 |                     </textField>
44 |                     <slider verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Us4-ey-xd7">
45 |                         <rect key="frame" x="114" y="100" width="132" height="24"/>
46 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
47 |                         <sliderCell key="cell" state="on" alignment="left" minValue="20" maxValue="400" doubleValue="200" tickMarkPosition="above" numberOfTickMarks="20" allowsTickMarkValuesOnly="YES" sliderType="linear" id="Zxi-c8-h8a"/>
48 |                     </slider>
49 |                     <slider verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="mtT-Ty-wSc">
50 |                         <rect key="frame" x="114" y="68" width="132" height="24"/>
51 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
52 |                         <sliderCell key="cell" state="on" alignment="left" minValue="1" maxValue="8" doubleValue="2" tickMarkPosition="below" numberOfTickMarks="8" allowsTickMarkValuesOnly="YES" sliderType="linear" id="XNc-Nx-L8u"/>
53 |                     </slider>
54 |                     <textField horizontalHuggingPriority="251" verticalHuggingPriority="750" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="ajp-ZT-Nn3">
55 |                         <rect key="frame" x="17" y="15" width="95" height="37"/>
56 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
57 |                         <textFieldCell key="cell" sendsActionOnEndEditing="YES" alignment="left" title="Measurement method" id="MfL-0K-Bum">
58 |                             <font key="font" metaFont="system"/>
59 |                             <color key="textColor" name="labelColor" catalog="System" colorSpace="catalog"/>
60 |                             <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
61 |                         </textFieldCell>
62 |                     </textField>
63 |                     <button fixedFrame="YES" tag="1" translatesAutoresizingMaskIntoConstraints="NO" id="HYb-cP-Vr3">
64 |                         <rect key="frame" x="115" y="34" width="131" height="18"/>
65 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
66 |                         <buttonCell key="cell" type="radio" title="Closest point" bezelStyle="regularSquare" imagePosition="left" alignment="left" state="on" inset="2" id="ZmH-lC-B2V">
67 |                             <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
68 |                             <font key="font" metaFont="system"/>
69 |                         </buttonCell>
70 |                         <connections>
71 |                             <action selector="changeMeasureMode:" target="-2" id="9oQ-Pi-q3r"/>
72 |                         </connections>
73 |                     </button>
74 |                     <button fixedFrame="YES" tag="2" translatesAutoresizingMaskIntoConstraints="NO" id="8wE-6G-oLp">
75 |                         <rect key="frame" x="115" y="12" width="147" height="18"/>
76 |                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
77 |                         <buttonCell key="cell" type="radio" title="Corresponding point" bezelStyle="regularSquare" imagePosition="left" alignment="left" inset="2" id="05f-0E-q8L">
78 |                             <behavior key="behavior" changeContents="YES" doesNotDimImage="YES" lightByContents="YES"/>
79 |                             <font key="font" metaFont="system"/>
80 |                         </buttonCell>
81 |                         <connections>
82 |                             <action selector="changeMeasureMode:" target="-2" id="Ak3-pP-zBS"/>
83 |                         </connections>
84 |                     </button>
85 |                 </subviews>
86 |             </view>
87 |             <point key="canvasLocation" x="-91.5" y="37"/>
88 |         </window>
89 |     </objects>
90 | </document>
91 | 


--------------------------------------------------------------------------------
/Callipers/Info.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundleShortVersionString</key>
16 | 	<string>1.0</string>
17 | 	<key>CFBundleSignature</key>
18 | 	<string>????</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | </dict>
22 | </plist>
23 | 


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/Callipers/SCPathTime.h:
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 1 | //
 2 | //  SCPathTime.h
 3 | //  Callipers
 4 | //
 5 | //  Created by Simon Cozens on 21/12/2015.
 6 | //  Copyright © 2015 Simon Cozens. All rights reserved.
 7 | //
 8 | 
 9 | #import <Foundation/Foundation.h>
10 | #import <GlyphsCore/GSPath.h>
11 | 
12 | @interface SCPathTime : NSObject {
13 |     @public NSInteger segId;
14 |     @public CGFloat t;
15 |     @public GSPath* path;
16 | };
17 | 
18 | - (SCPathTime*) initWithPath:(GSPath*)p SegId:(NSInteger)i t:(CGFloat)_t;
19 | - (int) compareWith:(SCPathTime*)t2;
20 | - (void) stepTimeBy:(float)step;
21 | - (NSPoint) point;
22 | @end
23 | 


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/Callipers/SCPathTime.m:
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 1 | //
 2 | //  SCPathTime.m
 3 | //  Callipers
 4 | //
 5 | //  Created by Simon Cozens on 21/12/2015.
 6 | //  Copyright © 2015 Simon Cozens. All rights reserved.
 7 | //
 8 | 
 9 | #import "SCPathTime.h"
10 | #import <GlyphsCore/GSGeometrieHelper.h>
11 | 
12 | @implementation SCPathTime
13 | 
14 | - (void) stepTimeBy:(float)step {
15 |     t += step;
16 |     if (t <= 0) { t += 1; segId--; }
17 |     if (t >= 1) { t -= 1; segId++; }
18 | }
19 | 
20 | /* We do this madness instead of the path's pointAtTime function because
21 |  a) that fails on lines
22 |  b) the path time includes both on-curve and off-curve points (!)
23 |  */
24 | - (NSPoint) point {
25 |     NSArray* seg = path.segments[segId];
26 |     if ([ seg count] == 2) {
27 |         NSPoint p1 = [[seg objectAtIndex:0] pointValue];
28 |         NSPoint p2 = [[seg objectAtIndex:1] pointValue];
29 |         CGFloat x = p1.x + (p2.x-p1.x)*fmod(t,1.0);
30 |         CGFloat y = p1.y + (p2.y-p1.y)*fmod(t,1.0);
31 |         // NSLog(@"p1=[%g,%g] at t(%g)= [%g,%g] p2=[%g,%g]",p1.x,p1.y,fmod(t,1.0),x,y,p2.x,p2.y);
32 |         return NSMakePoint(x, y);
33 |     }
34 |     NSPoint p = GSPointAtTime(
35 |                               [[seg objectAtIndex:0] pointValue],
36 |                               [[seg objectAtIndex:1] pointValue],
37 |                               [[seg objectAtIndex:2] pointValue],
38 |                               [[seg objectAtIndex:3] pointValue],
39 |                               t);
40 |     return p;
41 | }
42 | 
43 | - (int) compareWith:(SCPathTime*)t2 {
44 |     if (segId < t2->segId) return -1;
45 |     if (segId > t2->segId) return 1;
46 |     return t < t2->t ? -1 : t > t2->t ? 1 : 0;
47 | }
48 | 
49 | - (SCPathTime*) copy {
50 |     SCPathTime* n = [[SCPathTime alloc] init];
51 |     n->path = self->path;
52 |     n->segId = self->segId;
53 |     n->t = self->t;
54 |     return n;
55 | }
56 | 
57 | - (SCPathTime*) initWithPath:(GSPath*)p SegId:(NSInteger)i t:(CGFloat)_t {
58 |     segId = i;
59 |     t = _t;
60 |     path = p;
61 |     return self;
62 | }
63 | 
64 | - (SCPathTime*) init {
65 |     segId = NSNotFound;
66 |     t = 0;
67 |     path = NULL;
68 |     return self;
69 | }
70 | 
71 | 
72 | @end
73 | 


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/Callipers/toolbar.pdf:
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https://raw.githubusercontent.com/simoncozens/Callipers/d4e04321fc43694affe39f43fb82147b3d8286ec/Callipers/toolbar.pdf


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/LICENSE:
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 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2016 Simon Cozens
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
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1 | # Callipers
2 | A Glyphs.app plugin for visualising stroke uniformity.
3 | 
4 | The Callipers plugin helps you to visualize the thickness of strokes. If you are creating a low contrast font, you want to ensure that curves on the inside and outside of a stroke vary at the same rate, so that your stroke remains a consistent stem thickness throughout the curve. Presumably decent type designers can do this by eye, but I am not a decent type designer, and need help from a computer to tell me whether my stems have consistent thickness or not. That's what the Callipers plugin does. This animation should be worth a thousand words:
5 | 
6 | ![Animation](https://raw.githubusercontent.com/simoncozens/Callipers/master/callipers.gif)
7 | 
8 | First, select the Callipers tool from the tool bar. Then draw a line through the stem; this green line marks where the measurement will start. Then draw another line; the red one marks where it will stop. (If you don't bisect exactly two curves, you have to do it again.) Then Callipers will show you your stem thickness: green marks areas of average thickness; redder areas are thicker than average and bluer ones are thinner than average.
9 | 


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/callipers.gif:
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https://raw.githubusercontent.com/simoncozens/Callipers/d4e04321fc43694affe39f43fb82147b3d8286ec/callipers.gif


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