add circle move

README.md

@@ -37,6 +37,7 @@ This package is still working in progress. More types would be added. Welcome an
 - Circle Loop2
 - Pixel Hole
 - Dots Wave
+- Circle Move
 
 For these kinds of art, the package provides as many parameters to control the appearance.
 
@@ -71,6 +72,7 @@ NewNoiseLine(n int)
 NewCircleLoop2(depth int)
 NewPixelHole(dotN int)
 NewDotsWave(dotsN int)
+NewCircleMove(circleNum int)
 ```
 
 ## Docs
@@ -419,22 +421,20 @@ func main() {
 
 ![](images/silksky.png)
 
-### Maze
+### Circle Move
 
 ```go
 func main() {
  rand.Seed(time.Now().Unix())
- c := generativeart.NewCanva(600, 600)
+ c := generativeart.NewCanva(1200, 500)
- c.SetBackground(generativeart.Azure)
+ c.SetBackground(common.White)
- c.SetLineWidth(3)
- c.SetLineColor(generativeart.Orange)
  c.FillBackground()
- c.Draw(generativeart.NewMaze(20))
+ c.Draw(generativeart.NewCircleMove(1000))
- c.ToPNG("maze.png")
+ c.ToPNG("circlemove.png")
 }
 ```
 
-![](images/maze.png)
+![](images/circlemove.png)
 
 ### Random Circle
 

circlemove.go

@@ -0,0 +1,60 @@
+package generativeart
+
+import (
+	"github.com/fogleman/gg"
+	"github.com/jdxyw/generativeart/common"
+	"math"
+	"math/rand"
+)
+
+type circleMove struct {
+	circleNum int
+}
+
+func NewCircleMove(circleNum int) *circleMove {
+	return &circleMove{
+		circleNum: circleNum,
+	}
+}
+
+// Generative draws a sircle moving images.
+func (cm *circleMove) Generative(c *canva) {
+	ctex := gg.NewContextForRGBA(c.img)
+	ctex.SetLineWidth(0.3)
+	noise := common.NewPerlinNoise()
+	cl := rand.Intn(255)
+	for i := 0; i < cm.circleNum; i++ {
+		//var sx, sy float64
+		var cxx float64
+		var np = 300.0
+		for j := 0.0; j < np; j += 1.0 {
+			theta := common.Remap(j, 0, np, 0, math.Pi*2)
+			cx := float64(i)*3 - 200.0
+			cy := float64(c.height)/2 + math.Sin(float64(i)/50)*float64(c.height)/12.0
+			xx := math.Cos(theta+cx/10)*float64(c.height)/6.0
+			yy := math.Sin(theta+cx/10)*float64(c.height)/6.0
+			p := common.NewVector(xx, yy)
+			xx = (xx + cx) / 150
+			yy = (yy + cy) / 150
+			p.Multiple(1 + 1.5*noise.Noise2D(xx, yy))
+			ctex.LineTo(cx+p.X, cy+p.Y)
+			cxx = cx
+		}
+		hue := int(cxx/4) - cl
+		if hue < 0 {
+			hue += 255
+		}
+
+		h := common.HSV{
+			H: hue,
+			S: 180,
+			V: 120,
+		}
+
+		rgba := h.ToRGB(255, 255, 255)
+		rgba.A = 255
+		ctex.SetColor(rgba)
+		ctex.Stroke()
+		ctex.ClosePath()
+	}
+}

common/blend.go

@@ -18,10 +18,10 @@ func Blend(src, dest *image.RGBA, mode BlendMode) *image.RGBA {
 		for j := 0; j < src.Bounds().Max.Y; j++ {
 			switch mode {
 			case Add:
-				if compareColor(src.At(i, j), Black) {
+				if compareColor(src.RGBAAt(i, j), Black) {
-					img.Set(i, j, dest.At(i, j))
+					img.Set(i, j, dest.RGBAAt(i, j))
 				} else {
-					img.SetRGBA(i, j, add(src.At(i, j), dest.At(i, j)))
+					img.SetRGBA(i, j, add(src.RGBAAt(i, j), dest.RGBAAt(i, j)))
 				}
 			}
 		}
@@ -29,9 +29,9 @@ func Blend(src, dest *image.RGBA, mode BlendMode) *image.RGBA {
 	return img
 }
 
-func compareColor(src, dst color.Color) bool {
+func compareColor(src, dst color.RGBA) bool {
-	sr, sg, sb ,sa := src.RGBA()
+	sr, sg, sb, sa := src.R, src.G, src.B, src.A
-	dr, dg, db, da := dst.RGBA()
+	dr, dg, db, da := dst.R, dst.G, dst.B, dst.A
 
 	if sr == dr && sg == dg && sb == db && sa == da {
 		return true
@@ -39,24 +39,18 @@ func compareColor(src, dst color.Color) bool {
 	return false
 }
 
-func add(srcC, dstC color.Color) color.RGBA {
+func add(srcC, dstC color.RGBA) color.RGBA {
 	c := color.RGBA{}
-	sr, sg, sb ,sa := srcC.RGBA()
+	sr, sg, sb, sa := srcC.R, srcC.G, srcC.B, srcC.A
-	dr, dg, db, da := dstC.RGBA()
+	dr, dg, db, da := dstC.R, dstC.G, dstC.B, dstC.A
 
-	//aSrc := float64(sa)/255.0
+	aSrc := float64(sa) / 255.0
-	//aDst := 1.0 - aSrc
+	aDst := 1.0 - aSrc
 
-	//c.R = uint8(float64(sr) * aSrc + float64(dr)*aDst)
+	c.R = uint8(ConstrainInt(int(float64(sr)*aSrc+float64(dr)*aDst), 0, 255))
-	//c.G = uint8(float64(sg) * aSrc + float64(dg)*aDst)
+	c.G = uint8(ConstrainInt(int(float64(sg)*aSrc+float64(dg)*aDst), 0, 255))
-	//c.B = uint8(float64(sb) * aSrc + float64(db)*aDst)
+	c.B = uint8(ConstrainInt(int(float64(sb)*aSrc+float64(db)*aDst), 0, 255))
-	//c.A = uint8(float64(sa) * aSrc + float64(da)*aDst)
+	c.A = uint8(ConstrainInt(int(float64(sa)*aSrc+float64(da)*aDst), 0, 255))
-
-	c.R = uint8(ConstrainInt(int(uint32(float64(sr)*0.05)+dr), 0, 255))
-	c.G = uint8(ConstrainInt(int(uint32(float64(sg)*0.05)+dg), 0, 255))
-	c.B = uint8(ConstrainInt(int(uint32(float64(sb)*0.05)+db), 0, 255))
-	c.A = uint8(ConstrainInt(int(uint32(float64(sa)*0.9)+da), 0, 255))
-	//c.A = uint8(float64(sa) * aSrc + float64(da)*aDst)
 
 	return c
 }

common/vector.go

@@ -0,0 +1,17 @@
+package common
+
+type Vector struct {
+	X, Y float64
+}
+
+func NewVector(x, y float64) *Vector {
+	return &Vector{
+		X: x,
+		Y: y,
+	}
+}
+
+func (v *Vector) Multiple(z float64) {
+	v.X = v.X * z
+	v.Y = v.Y * z
+}

docs/doc.md

@@ -163,3 +163,16 @@ d := generativeart.NewDotsWave(300)
 ```
 
 ![](../images/dotswave.png)
+
+## Circle Move
+
+### parameters
+
+- circleNum: The number of the circle in the image.
+
+
+```go
+cm := generativeart.NewCircleMove(1000)
+```
+
+![](../images/circlemove.png)

example/example_circlemove.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"github.com/jdxyw/generativeart"
+	"github.com/jdxyw/generativeart/common"
+	"math/rand"
+	"time"
+)
+
+func main() {
+	rand.Seed(time.Now().Unix())
+	c := generativeart.NewCanva(1200, 500)
+	c.SetBackground(common.White)
+	c.FillBackground()
+	c.Draw(generativeart.NewCircleMove(1000))
+	c.ToPNG("circlemove.png")
+}

generativeart.go

@@ -31,11 +31,11 @@ type Options struct {
 }
 
 // NewCanva returns a canva.
-func NewCanva(h, w int) *canva {
+func NewCanva(w, h int) *canva {
 	return &canva{
 		height: h,
 		width:  w,
-		img:    image.NewRGBA(image.Rect(0, 0, h, w)),
+		img:    image.NewRGBA(image.Rect(0, 0, w, h)),
 		// Set some defaults value
 		opts: Options{
 			background:  common.Azure,

solarflare.go

@@ -16,7 +16,6 @@ func NewSolarFlare() *solarFlare {
 	return &solarFlare{}
 }
 
-
 // Generative draws a solar flare images.
 func (o *solarFlare) Generative(c *canva) {
 	var xOffset, yOffset float64
@@ -26,14 +25,13 @@ func (o *solarFlare) Generative(c *canva) {
 	var m = 1.005
 	noise := common.NewPerlinNoise()
 
-
 	for r < 200 {
 		for i := 0; i < 10; i++ {
 			nPoints := int(2 * math.Pi * r)
 			nPoints = common.MinInt(nPoints, 500)
 
 			img := image.NewRGBA(image.Rect(0, 0, c.width, c.height))
-			draw.Draw(img, img.Bounds(), &image.Uniform{color.RGBA{0,0,0,255}}, image.ZP, draw.Src)
+			draw.Draw(img, img.Bounds(), &image.Uniform{color.Black}, image.ZP, draw.Src)
 			ctex := gg.NewContextForRGBA(img)
 
 			ctex.Push()
@@ -54,9 +52,6 @@ func (o *solarFlare) Generative(c *canva) {
 			ctex.Pop()
 
 			c.img = common.Blend(img, c.img, common.Add)
-			//cc := NewCanva(0,0)
-			//cc.img = c.img
-			//cc.ToPNG(fmt.Sprintf("xxxx%v.png", r))
 			xOffset += offsetInc
 			yOffset += offsetInc
 			r *= m