add maze generation and some other files

example/example.go

@@ -11,9 +11,9 @@ func formula1(x, y float64) (float64, float64) {
 }
 
 func main() {
-	c := generativeart.NewCanva(1600, 1600, 4, 4)
-	c.FillBackgroud(generativeart.Tomato)
+	c := generativeart.NewCanva(1600, 1600, 2, 2)
+	c.FillBackgroud(generativeart.White)
 	g := generativeart.NewWave(formula1)
-	g.GenerativePolar(c, generativeart.Black)
+	g.GenerativePolar(c, generativeart.DarkSalmon)
 	c.ToPng("g1.png")
 }

example/example_maze.go

@@ -0,0 +1,11 @@
+package main
+
+import "generativeart"
+
+func main() {
+	c := generativeart.NewCanva(800, 800, 2,2)
+	c.FillBackgroud(generativeart.Azure)
+	g := generativeart.NewMaze()
+	g.Generative(c, generativeart.Tomato)
+	c.ToPng("maze.png")
+}

go.mod

@@ -1,3 +1,9 @@
 module generativeart
 
 go 1.14
+
+require (
+	github.com/fogleman/gg v1.3.0
+	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	golang.org/x/image v0.0.0-20210220032944-ac19c3e999fb // indirect
+)

go.sum

@@ -0,0 +1,7 @@
+github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
+github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+golang.org/x/image v0.0.0-20210220032944-ac19c3e999fb h1:fqpd0EBDzlHRCjiphRR5Zo/RSWWQlWv34418dnEixWk=
+golang.org/x/image v0.0.0-20210220032944-ac19c3e999fb/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

maze.go

@@ -0,0 +1,37 @@
+package generativeart
+
+import (
+	"image/color"
+	"math/rand"
+
+	"github.com/fogleman/gg"
+)
+
+type maze struct{}
+
+// NewMaze returns a maze generator.
+func NewMaze() *maze {
+	return &maze{}
+}
+
+// Generative draws a random maze image.
+func (m *maze) Generative(c *canva, rgba color.RGBA) {
+	ctex := gg.NewContextForRGBA(c.img)
+	ctex.SetColor(rgba)
+	ctex.SetLineWidth(3.0)
+	step := 20
+	for x := 0; x < c.width; x += step {
+		for y := 0; y < c.height; y += step {
+			if rand.Float32() > 0.5 {
+				ctex.DrawLine(float64(x), float64(y), float64(x+step), float64(y+step))
+
+				//ctex.Stroke()
+			} else {
+				ctex.DrawLine(float64(x+step), float64(y), float64(x), float64(y+step))
+				ctex.SetLineWidth(3.0)
+				//ctex.Stroke()
+			}
+			ctex.Stroke()
+		}
+	}
+}

wave.go

@@ -3,6 +3,8 @@ package generativeart
 import (
 	"image/color"
 	"math"
+
+	"github.com/fogleman/gg"
 )
 
 type Formula func(x, y float64) (float64, float64)
@@ -18,6 +20,7 @@ func NewWave(fn Formula) *wave {
 
 // GenerativePolar draws the image in polar coordinate system.
 func (w *wave) GenerativePolar(c *canva, rgba color.RGBA) {
+	ctex := gg.NewContextForRGBA(c.img)
 	for x := -math.Pi; x <= math.Pi; x += 0.01 {
 		for y := -math.Pi; y <= math.Pi; y += 0.01 {
 			xi, yi := w.fn(x, y)
@@ -25,7 +28,10 @@ func (w *wave) GenerativePolar(c *canva, rgba color.RGBA) {
 			if i < 0 || i > c.width-1 || j < 0 || j > c.height-1 {
 				continue
 			}
-			c.img.Set(i, j, rgba)
+			ctex.DrawCircle(float64(i), float64(j), 1.0)
+			ctex.SetColor(rgba)
+			ctex.Fill()
+			//c.img.Set(i, j, rgba)
 		}
 	}
 }