├── LICENSE.md ├── README.md ├── drawille.go ├── drawille_test.go ├── examples └── basic.go └── rotating_cube └── rotating_cube.go /LICENSE.md: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | GO-DRAWILLE 2 | =========== 3 | Drawing in the terminal with Unicode Braille characters. 4 | A [go](https://golang.org) port of [asciimoo's](https://github.com/asciimoo) [drawille](https://github.com/asciimoo/drawille) 5 | 6 | ### LICENSE 7 | 8 | ``` 9 | drawille-go is free software: you can redistribute it and/or modify 10 | it under the terms of the GNU Affero General Public License as published by 11 | the Free Software Foundation, either version 3 of the License, or 12 | (at your option) any later version. 13 | 14 | drawille-go is distributed in the hope that it will be useful, 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 | GNU Affero General Public License for more details. 18 | 19 | You should have received a copy of the GNU Affero General Public License 20 | along with drawille-go. If not, see < http://www.gnu.org/licenses/ >. 21 | 22 | (C) 2014 by Adam Tauber, 23 | (C) 2014 by Jacob Hughes, 24 | ``` 25 | -------------------------------------------------------------------------------- /drawille.go: -------------------------------------------------------------------------------- 1 | package drawille 2 | 3 | //import "code.google.com/p/goncurses" 4 | import "math" 5 | 6 | var pixel_map = [4][2]int{ 7 | {0x1, 0x8}, 8 | {0x2, 0x10}, 9 | {0x4, 0x20}, 10 | {0x40, 0x80}} 11 | 12 | // Braille chars start at 0x2800 13 | var braille_char_offset = 0x2800 14 | 15 | func getPixel(y, x int) int { 16 | var cy, cx int 17 | if y >= 0 { 18 | cy = y % 4 19 | } else { 20 | cy = 3 + ((y + 1) % 4) 21 | } 22 | if x >= 0 { 23 | cx = x % 2 24 | } else { 25 | cx = 1 + ((x + 1) % 2) 26 | } 27 | return pixel_map[cy][cx] 28 | } 29 | 30 | type Canvas struct { 31 | LineEnding string 32 | chars map[int]map[int]int 33 | } 34 | 35 | // Make a new canvas 36 | func NewCanvas() Canvas { 37 | c := Canvas{LineEnding: "\n"} 38 | c.Clear() 39 | return c 40 | } 41 | 42 | func (c Canvas) MaxY() int { 43 | max := 0 44 | for k, _ := range c.chars { 45 | if k > max { 46 | max = k 47 | } 48 | } 49 | return max * 4 50 | } 51 | 52 | func (c Canvas) MinY() int { 53 | min := 0 54 | for k, _ := range c.chars { 55 | if k < min { 56 | min = k 57 | } 58 | } 59 | return min * 4 60 | } 61 | 62 | func (c Canvas) MaxX() int { 63 | max := 0 64 | for _, v := range c.chars { 65 | for k, _ := range v { 66 | if k > max { 67 | max = k 68 | } 69 | } 70 | } 71 | return max * 2 72 | } 73 | 74 | func (c Canvas) MinX() int { 75 | min := 0 76 | for _, v := range c.chars { 77 | for k, _ := range v { 78 | if k < min { 79 | min = k 80 | } 81 | } 82 | } 83 | return min * 2 84 | } 85 | 86 | // Clear all pixels 87 | func (c *Canvas) Clear() { 88 | c.chars = make(map[int]map[int]int) 89 | } 90 | 91 | // Convert x,y to cols, rows 92 | func (c Canvas) get_pos(x, y int) (int, int) { 93 | return (x / 2), (y / 4) 94 | } 95 | 96 | // Set a pixel of c 97 | func (c *Canvas) Set(x, y int) { 98 | px, py := c.get_pos(x, y) 99 | if m := c.chars[py]; m == nil { 100 | c.chars[py] = make(map[int]int) 101 | } 102 | val := c.chars[py][px] 103 | mapv := getPixel(y, x) 104 | c.chars[py][px] = val | mapv 105 | } 106 | 107 | // Unset a pixel of c 108 | func (c *Canvas) UnSet(x, y int) { 109 | px, py := c.get_pos(x, y) 110 | x, y = int(math.Abs(float64(x))), int(math.Abs(float64(y))) 111 | if m := c.chars[py]; m == nil { 112 | c.chars[py] = make(map[int]int) 113 | } 114 | c.chars[py][px] = c.chars[py][px] &^ getPixel(y, x) 115 | } 116 | 117 | // Toggle a point 118 | func (c *Canvas) Toggle(x, y int) { 119 | px, py := c.get_pos(x, y) 120 | if (c.chars[py][px] & getPixel(y, x)) != 0 { 121 | c.UnSet(x, y) 122 | } else { 123 | c.Set(x, y) 124 | } 125 | } 126 | 127 | // Set text to the given coordinates 128 | func (c *Canvas) SetText(x, y int, text string) { 129 | x, y = x/2, y/4 130 | if m := c.chars[y]; m == nil { 131 | c.chars[y] = make(map[int]int) 132 | } 133 | for i, char := range text { 134 | c.chars[y][x+i] = int(char) - braille_char_offset 135 | } 136 | } 137 | 138 | // Get pixel at the given coordinates 139 | func (c Canvas) Get(x, y int) bool { 140 | dot_index := pixel_map[y%4][x%2] 141 | x, y = x/2, y/4 142 | char := c.chars[y][x] 143 | return (char & dot_index) != 0 144 | } 145 | 146 | // Get character at the given screen coordinates 147 | func (c Canvas) GetScreenCharacter(x, y int) rune { 148 | return rune(c.chars[y][x] + braille_char_offset) 149 | } 150 | 151 | // Get character for the given pixel 152 | func (c Canvas) GetCharacter(x, y int) rune { 153 | return c.GetScreenCharacter(x/4,y/4) 154 | } 155 | 156 | // Retrieve the rows from a given view 157 | func (c Canvas) Rows(minX, minY, maxX, maxY int) []string { 158 | minrow, maxrow := minY/4, (maxY)/4 159 | mincol, maxcol := minX/2, (maxX)/2 160 | 161 | ret := make([]string, 0) 162 | for rownum := minrow; rownum < (maxrow + 1); rownum = rownum + 1 { 163 | row := "" 164 | for x := mincol; x < (maxcol + 1); x = x + 1 { 165 | char := c.chars[rownum][x] 166 | row += string(rune(char + braille_char_offset)) 167 | } 168 | ret = append(ret, row) 169 | } 170 | return ret 171 | } 172 | 173 | // Retrieve a string representation of the frame at the given parameters 174 | func (c Canvas) Frame(minX, minY, maxX, maxY int) string { 175 | var ret string 176 | for _, row := range c.Rows(minX, minY, maxX, maxY) { 177 | ret += row 178 | ret += c.LineEnding 179 | } 180 | return ret 181 | } 182 | 183 | func (c Canvas) String() string { 184 | return c.Frame(c.MinX(), c.MinY(), c.MaxX(), c.MaxY()) 185 | } 186 | 187 | func (c *Canvas) DrawLine(x1, y1, x2, y2 float64) { 188 | xdiff := math.Abs(x1 - x2) 189 | ydiff := math.Abs(y2 - y1) 190 | 191 | var xdir, ydir float64 192 | if x1 <= x2 { 193 | xdir = 1 194 | } else { 195 | xdir = -1 196 | } 197 | if y1 <= y2 { 198 | ydir = 1 199 | } else { 200 | ydir = -1 201 | } 202 | 203 | r := math.Max(xdiff, ydiff) 204 | 205 | for i := 0; i < round(r)+1; i = i + 1 { 206 | x, y := x1, y1 207 | if ydiff != 0 { 208 | y += (float64(i) * ydiff) / (r * ydir) 209 | } 210 | if xdiff != 0 { 211 | x += (float64(i) * xdiff) / (r * xdir) 212 | } 213 | c.Toggle(round(x), round(y)) 214 | } 215 | } 216 | 217 | func (c *Canvas) DrawPolygon(center_x, center_y, sides, radius float64) { 218 | degree := 360 / sides 219 | for n := 0; n < int(sides); n = n + 1 { 220 | a := float64(n) * degree 221 | b := float64(n+1) * degree 222 | 223 | x1 := (center_x + (math.Cos(radians(a)) * (radius/2 + 1))) 224 | y1 := (center_y + (math.Sin(radians(a)) * (radius/2 + 1))) 225 | x2 := (center_x + (math.Cos(radians(b)) * (radius/2 + 1))) 226 | y2 := (center_y + (math.Sin(radians(b)) * (radius/2 + 1))) 227 | 228 | c.DrawLine(x1, y1, x2, y2) 229 | } 230 | } 231 | 232 | func radians(d float64) float64 { 233 | return d * (math.Pi / 180) 234 | } 235 | 236 | func round(x float64) int { 237 | return int(x + 0.5) 238 | } 239 | -------------------------------------------------------------------------------- /drawille_test.go: -------------------------------------------------------------------------------- 1 | package drawille 2 | 3 | import ( 4 | "testing" 5 | 6 | "github.com/stretchr/testify/assert" 7 | ) 8 | 9 | func TestSet(t *testing.T) { 10 | c := NewCanvas() 11 | c.Set(0, 0) 12 | 13 | assert.True(t, c.Get(0, 0)) 14 | } 15 | 16 | func TestUnsetEmpty(t *testing.T) { 17 | c := NewCanvas() 18 | c.Set(1, 1) 19 | c.UnSet(1, 1) 20 | 21 | assert.False(t, c.Get(0, 0)) 22 | assert.False(t, c.Get(0, 1)) 23 | assert.False(t, c.Get(1, 0)) 24 | assert.False(t, c.Get(1, 1)) 25 | } 26 | 27 | func TestUnsetNonempty(t *testing.T) { 28 | c := NewCanvas() 29 | c.Set(0, 0) 30 | c.Set(0, 1) 31 | c.UnSet(0, 1) 32 | assert.True(t, c.Get(0, 0)) 33 | } 34 | 35 | func TestClear(t *testing.T) { 36 | c := NewCanvas() 37 | c.Set(1, 1) 38 | c.Clear() 39 | assert.False(t, c.Get(1, 1)) 40 | } 41 | 42 | func TestToggle(t *testing.T) { 43 | c := NewCanvas() 44 | c.Toggle(0, 0) 45 | assert.True(t, c.Get(0, 0)) 46 | c.Toggle(0, 0) 47 | assert.False(t, c.Get(0, 0)) 48 | } 49 | 50 | func TestSetText(t *testing.T) { 51 | c := NewCanvas() 52 | c.SetText(0, 0, "asdf") 53 | assert.Equal(t, "asdf\n", c.Frame(0, 0, 7, 3)) 54 | } 55 | 56 | func TestFrame(t *testing.T) { 57 | c := NewCanvas() 58 | assert.Equal(t, "\u2800\n", c.Frame(0, 0, 1, 3)) 59 | c.Set(0, 0) 60 | assert.Equal(t, "⠁\n", c.Frame(0, 0, 1, 3)) 61 | } 62 | 63 | // test_max_min_limits could not be ported 64 | 65 | func TestGet(t *testing.T) { 66 | c := NewCanvas() 67 | assert.False(t, c.Get(0, 0)) 68 | c.Set(0, 0) 69 | assert.True(t, c.Get(0, 0)) 70 | assert.False(t, c.Get(0, 1)) 71 | assert.False(t, c.Get(1, 0)) 72 | assert.False(t, c.Get(1, 1)) 73 | } 74 | 75 | func TestDrawLineSinglePixel(t *testing.T) { 76 | c := NewCanvas() 77 | c.DrawLine(0, 0, 0, 0) 78 | assert.True(t, c.Get(0, 0)) 79 | } 80 | 81 | func TestDrawLineRow(t *testing.T) { 82 | c := NewCanvas() 83 | c.DrawLine(0, 0, 1, 0) 84 | assert.True(t, c.Get(0, 0)) 85 | assert.True(t, c.Get(1, 0)) 86 | } 87 | 88 | func TestDrawLineColumn(t *testing.T) { 89 | c := NewCanvas() 90 | c.DrawLine(0, 0, 0, 1) 91 | assert.True(t, c.Get(0, 0)) 92 | assert.True(t, c.Get(0, 1)) 93 | } 94 | 95 | func TestDrawLineDiagonal(t *testing.T) { 96 | c := NewCanvas() 97 | c.DrawLine(0, 0, 1, 1) 98 | assert.True(t, c.Get(0, 0)) 99 | assert.True(t, c.Get(1, 1)) 100 | } 101 | 102 | func TestDrawLineDiagonalNonSquare(t *testing.T) { 103 | c := NewCanvas() 104 | c.DrawLine(0, 0, 2, 3) 105 | assert.True(t, c.Get(0, 0)) 106 | assert.True(t, c.Get(1, 1)) 107 | assert.True(t, c.Get(1, 2)) 108 | assert.True(t, c.Get(2, 3)) 109 | } 110 | -------------------------------------------------------------------------------- /examples/basic.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "github.com/exrook/drawille-go" 5 | "math" 6 | "fmt" 7 | ) 8 | 9 | func main() { 10 | s := drawille.NewCanvas() 11 | for x:=0;x<(1800);x=x+1 { 12 | y := int(math.Sin((math.Pi/180)*float64(x))*10+0.5) 13 | s.Set(x/10,y) 14 | } 15 | fmt.Print(s) 16 | 17 | s.Clear() 18 | 19 | for x:=0;x<1800;x=x+10 { 20 | s.Set(x/10,int(10+math.Sin((math.Pi/180)*float64(x))*10+0.5)) 21 | s.Set(x/10,int(10+math.Cos((math.Pi/180)*float64(x))*10+0.5)) 22 | } 23 | fmt.Print(s) 24 | 25 | s.Clear() 26 | 27 | for x:=0;x<3600;x=x+20 { 28 | s.Set(x/20,int(4+math.Sin((math.Pi/180)*float64(x))*4)) 29 | } 30 | fmt.Print(s) 31 | 32 | s.Clear() 33 | 34 | for x:=0;x<360;x=x+1 { 35 | s.Set(x/4,int(30+math.Sin((math.Pi/180)*float64(x))*30)) 36 | } 37 | 38 | for x:=0;x<30;x=x+1 { 39 | for y:=0;y<30;y=y+1 { 40 | s.Set(x,y) 41 | s.Toggle(x+30,y+30) 42 | s.Toggle(x+60,y) 43 | } 44 | } 45 | fmt.Print(s) 46 | } 47 | -------------------------------------------------------------------------------- /rotating_cube/rotating_cube.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | // ported from the rotating cube example from github.com/asciimoo/drawille by Alexander Rødseth (xyproto) 4 | // GPL3 5 | 6 | import ( 7 | . "github.com/exrook/drawille-go" 8 | tg "github.com/nsf/termbox-go" 9 | "math" 10 | "os" 11 | "strings" 12 | "time" 13 | ) 14 | 15 | const RAD = math.Pi / 180.0 16 | 17 | type ( 18 | Point3D struct { 19 | x float64 20 | y float64 21 | z float64 22 | } 23 | Face []int 24 | ) 25 | 26 | var ( 27 | vertices []Point3D = []Point3D{ 28 | Point3D{-20.0, 20.0, -20.0}, 29 | Point3D{20.0, 20.0, -20.0}, 30 | Point3D{20.0, -20.0, -20.0}, 31 | Point3D{-20.0, -20.0, -20.0}, 32 | Point3D{-20.0, 20.0, 20.0}, 33 | Point3D{20.0, 20.0, 20.0}, 34 | Point3D{20.0, -20.0, 20.0}, 35 | Point3D{-20.0, -20.0, 20.0}, 36 | } 37 | faces []Face = []Face{ 38 | Face{0, 1, 2, 3}, 39 | Face{1, 5, 6, 2}, 40 | Face{5, 4, 7, 6}, 41 | Face{4, 0, 3, 7}, 42 | Face{0, 4, 5, 1}, 43 | Face{3, 2, 6, 7}, 44 | } 45 | ) 46 | 47 | func NewPoint3D(x, y, z float64) *Point3D { 48 | return &Point3D{x, y, z} 49 | } 50 | 51 | func (p *Point3D) RotateX(angle float64) *Point3D { 52 | rad := RAD * angle 53 | cosa := math.Cos(rad) 54 | sina := math.Sin(rad) 55 | y := p.y*cosa - p.z*sina 56 | z := p.y*sina + p.z*cosa 57 | return &Point3D{p.x, y, z} 58 | } 59 | 60 | func (p *Point3D) RotateY(angle float64) *Point3D { 61 | rad := RAD * angle 62 | cosa := math.Cos(rad) 63 | sina := math.Sin(rad) 64 | z := p.z*cosa - p.x*sina 65 | x := p.z*sina + p.x*cosa 66 | return &Point3D{x, p.y, z} 67 | } 68 | 69 | func (p *Point3D) RotateZ(angle float64) *Point3D { 70 | rad := RAD * angle 71 | cosa := math.Cos(rad) 72 | sina := math.Sin(rad) 73 | x := p.x*cosa - p.y*sina 74 | y := p.x*sina + p.y*cosa 75 | return &Point3D{x, y, p.z} 76 | } 77 | 78 | func (p *Point3D) Project(win_width, win_height, fov, viewer_distance float64) *Point3D { 79 | factor := fov / (viewer_distance + p.z) 80 | x := p.x*factor + win_width/2.0 81 | y := -p.y*factor + win_height/2.0 82 | return &Point3D{x, y, 1.0} 83 | } 84 | 85 | func run(projection bool) { 86 | var t []Point3D 87 | var p *Point3D 88 | 89 | tg.Clear(tg.ColorRed|tg.AttrBold, tg.ColorBlack|tg.AttrBold) 90 | 91 | eventQueue := make(chan tg.Event) 92 | go func() { 93 | for { 94 | eventQueue <- tg.PollEvent() 95 | } 96 | }() 97 | drawTick := time.NewTicker(50 * time.Millisecond) 98 | 99 | angleX, angleY, angleZ := 0.0, 0.0, 0.0 100 | c := NewCanvas() 101 | for { 102 | select { 103 | case ev := <-eventQueue: 104 | if ev.Type == tg.EventKey && ev.Key == tg.KeyEsc { 105 | return 106 | } 107 | case <-drawTick.C: 108 | 109 | // Will hold transformed vertices. 110 | t = []Point3D{} 111 | 112 | for _, v := range vertices { 113 | // Rotate the point around X axis, then around Y axis, and finally around Z axis. 114 | p = &v 115 | p = p.RotateX(angleX) 116 | p = p.RotateY(angleY) 117 | p = p.RotateZ(angleZ) 118 | if projection { 119 | // Transform the point from 3D to 2D 120 | p = p.Project(50, 50, 50, 50) 121 | } 122 | // Put the point in the list of transformed vertices 123 | t = append(t, *p) 124 | } 125 | 126 | for _, f := range faces { 127 | c.DrawLine(t[f[0]].x, t[f[0]].y, t[f[1]].x, t[f[1]].y) 128 | c.DrawLine(t[f[1]].x, t[f[1]].y, t[f[2]].x, t[f[2]].y) 129 | c.DrawLine(t[f[2]].x, t[f[2]].y, t[f[3]].x, t[f[3]].y) 130 | c.DrawLine(t[f[3]].x, t[f[3]].y, t[f[0]].x, t[f[0]].y) 131 | } 132 | 133 | f := c.Frame(-40, -40, 80, 80) 134 | 135 | xoffset := 2 136 | for y, line := range strings.Split(f, "\n") { 137 | pos := 0 138 | for _, r := range line { // iterates over runes, not positions 139 | tg.SetCell(xoffset+pos, y, r, tg.ColorRed|tg.AttrBold, tg.ColorBlack|tg.AttrBold) 140 | pos++ 141 | } 142 | } 143 | 144 | tg.Flush() 145 | 146 | angleX += 2.0 147 | angleY += 3.0 148 | angleZ += 5.0 149 | 150 | c.Clear() 151 | } 152 | } 153 | } 154 | 155 | func main() { 156 | projection := false 157 | if len(os.Args) > 1 { 158 | if os.Args[1] == "-p" { 159 | projection = true 160 | } 161 | } 162 | tg.Init() 163 | run(projection) 164 | tg.Close() 165 | } 166 | --------------------------------------------------------------------------------