add noise lines

README.md

@@ -27,6 +27,7 @@ This package is still working in progress. More types would be added. Welcome an
 - Color Circle2
 - Circle Grid
 - Contour Line
+- Noise Line
 
 For these kinds of art, the package provides as many parameters to control the appearance.
 
@@ -57,6 +58,7 @@ NewColorCircle(circleNum int)
 NewColorCircle2(circleNum int)
 NewCircleGrid(circleNumMin, circleNumMax int)
 NewContourLine(lineNum int)
+NewNoiseLine(n int)
 ```
 
 ## Docs
@@ -215,6 +217,28 @@ func main() {
 
 ![](images/contourline.png)
 
+### Noise Line
+
+```go
+func main() {
+	rand.Seed(time.Now().Unix())
+	colors := []color.RGBA{
+		{0x06, 0x7B, 0xC2, 0xFF},
+		{0x84, 0xBC, 0xDA, 0xFF},
+		{0xEC, 0xC3, 0x0B, 0xFF},
+		{0xF3, 0x77, 0x48, 0xFF},
+		{0xD5, 0x60, 0x62, 0xFF},
+	}
+	c := generativeart.NewCanva(1000, 1000)
+	c.SetBackground(color.RGBA{0xF0, 0xFE, 0xFF, 0xFF})
+	c.FillBackground()
+	c.SetColorSchema(colors)
+	c.Draw(generativeart.NewNoiseLine(1000))
+	c.ToPNG("noiseline.png")
+}
+```
+
+![](images/noiseline.png)
 ### Circle Loop
 
 ```go

contourline.go

@@ -21,7 +21,6 @@ func NewContourLine(lineNum int) *contourLine {
 // Generative draws a contour line image.
 func (cl *contourLine) Generative(c *canva) {
 	ctex := gg.NewContextForRGBA(c.img)
-	//noise := perlin.NewPerlin(2, 2, 3, rand.Int63())
 	noise := common.NewPerlinNoise()
 	for i := 0; i < cl.lineNum; i++ {
 		cl := c.opts.colorSchema[rand.Intn(len(c.opts.colorSchema))]

docs/doc.md

@@ -94,3 +94,17 @@ julia := generativeart.NewJulia(julia1, 40, 1.5, 1.5)
 ```
 
 ![](../images/julia.png)
+
+## Noise Line
+
+`Noise Line` draws some random line and circles based on `perlin noise`.
+
+### parameters
+
+- n: The number of random line.
+
+```go
+nl := generativeart.NewNoiseLine(1000)
+```
+
+![](../images/noiseline.png)

example/example_noiseline.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"github.com/jdxyw/generativeart"
+	"image/color"
+	"math/rand"
+	"time"
+)
+
+func main() {
+	rand.Seed(time.Now().Unix())
+	colors := []color.RGBA{
+		{0x06, 0x7B, 0xC2, 0xFF},
+		{0x84, 0xBC, 0xDA, 0xFF},
+		{0xEC, 0xC3, 0x0B, 0xFF},
+		{0xF3, 0x77, 0x48, 0xFF},
+		{0xD5, 0x60, 0x62, 0xFF},
+	}
+	c := generativeart.NewCanva(1000, 1000)
+	c.SetBackground(color.RGBA{0xF0, 0xFE, 0xFF, 0xFF})
+	c.FillBackground()
+	c.SetColorSchema(colors)
+	c.Draw(generativeart.NewNoiseLine(1000))
+	c.ToPNG("noiseline.png")
+}

example/test.go

@@ -1,41 +1,43 @@
 package main
 
-import (
+import "github.com/fogleman/gg"
-	"github.com/fogleman/gg"
-	"github.com/jdxyw/generativeart"
-	"github.com/llgcode/draw2d/draw2dimg"
-	"image"
-	"math/rand"
-	"time"
-)
 
 func main() {
-	const S = 400
+	//const S = 400
-	rand.Seed(time.Now().Unix())
+	//rand.Seed(time.Now().Unix())
-	dest := image.NewRGBA(image.Rect(0, 0, 500, 500))
+	//dest := image.NewRGBA(image.Rect(0, 0, 500, 500))
+	//
+	//ctex := gg.NewContextForRGBA(dest)
+	//ctex.Push()
+	//ctex.Translate(500/2, 500/2)
+	//ctex.Rotate(40)
+	//ctex.SetColor(color.RGBA{0xFF, 0x00, 0x00, 255})
+	//for theta :=0.0; theta<361.0; theta+=1.0 {
+	//	x := 100*math.Cos(gg.Radians(theta)) - 100*math.Pow(math.Sin(gg.Radians(theta)), 2) / math.Sqrt(2)
+	//	y := 100*math.Cos(gg.Radians(theta))*math.Sin(gg.Radians(theta))
+	//
+	//	x1 := 100*math.Cos(gg.Radians(theta+1)) - 100*math.Pow(math.Sin(gg.Radians(theta+1)), 2) / math.Sqrt(2)
+	//	y1 := 100*math.Cos(gg.Radians(theta+1))*math.Sin(gg.Radians(theta+1))
+	//
+	//	ctex.DrawLine(x, y, x1, y1)
+	//	ctex.Stroke()
+	//}
+	//ctex.Pop()
+	//
+	//
+	//f, _ := os.Create("test.png")
+	//
+	//if err := png.Encode(f, dest); err != nil {
+	//	f.Close()
+	//}
 
-	gc := draw2dimg.NewGraphicContext(dest)
+	dc := gg.NewContext(1000, 1000)
-	gc.SetStrokeColor(generativeart.Orange)
+	dc.DrawCircle(350, 500, 300)
-	gc.BeginPath()
+	dc.Clip()
-	gc.MoveTo(100, 100)
+	dc.DrawCircle(650, 500, 300)
-	gc.QuadCurveTo(150, 50, 200, 100)
+	dc.Clip()
-	//fmt.Println(gc.LastPoint())
+	dc.DrawRectangle(0, 0, 1000, 1000)
-	//gc.QuadCurveTo(200, 100, 300, 200)
+	dc.SetRGB(0, 0, 0)
-	gc.QuadCurveTo(250, 250, 200, 400)
+	dc.Fill()
-	gc.QuadCurveTo(100, 250, 100, 100)
+	dc.SavePNG("out.png")
-	//gc.QuadCurveTo(200, 400, 100, 10)
-	//gc.Close()
-	gc.Stroke()
-
-	ctex := gg.NewContextForRGBA(dest)
-	ctex.SetColor(generativeart.White)
-	//ctex.DrawCircle(100, 100, 5)
-	//ctex.DrawCircle(200, 400, 5)
-	//ctex.DrawCircle(200, 100, 5)
-	//ctex.DrawCircle(300, 200, 5)
-	//ctex.DrawCircle(200, 400, 5)
-	ctex.Fill()
-	//gc.FillStroke()
-
-	draw2dimg.SaveToPngFile("test.png", dest)
 }

noiseline.go

@@ -0,0 +1,57 @@
+package generativeart
+
+import (
+	"github.com/fogleman/gg"
+	"github.com/jdxyw/generativeart/common"
+	"math"
+	"math/rand"
+)
+
+type noiseLine struct {
+	n int
+}
+
+// NewNoiseLine returns a noiseLine object.
+func NewNoiseLine(n int) *noiseLine {
+	return &noiseLine{
+		n: n,
+	}
+}
+
+// Generative draws a noise line image.
+func (nl *noiseLine) Generative(c *canva) {
+	ctex := gg.NewContextForRGBA(c.img)
+	noise := common.NewPerlinNoise()
+
+	ctex.SetColor(Black)
+	for i := 0; i < 80; i++ {
+		x := rand.Float64() * float64(c.width)
+		y := rand.Float64() * float64(c.height)
+
+		s := rand.Float64() * float64(c.width) / 8
+		ctex.SetLineWidth(0.5)
+		ctex.DrawEllipse(x, y, s, s)
+		ctex.Stroke()
+	}
+
+	t := rand.Float64() * 10
+	for i := 0; i < nl.n; i++ {
+		x := common.RandomRangeFloat64(-0.5, 1.5) * float64(c.width)
+		y := common.RandomRangeFloat64(-0.5, 1.5) * float64(c.height)
+		cl := c.opts.colorSchema[rand.Intn(len(c.opts.colorSchema))]
+		cl.A = uint8(c.opts.alpha)
+
+		l := 400
+		for j := 0; j < l; j++ {
+			var ns = 0.0005
+			w := math.Sin(math.Pi*float64(j)/float64(l-1)) * 5
+			theta := noise.Noise(x*ns, y*ns, t) * 100
+			ctex.SetColor(cl)
+			ctex.DrawCircle(x, y, w)
+			ctex.Fill()
+			x += math.Cos(theta)
+			y += math.Sin(theta)
+			t += 0.0000003
+		}
+	}
+}