add color circle 2

README.md

@@ -24,6 +24,7 @@ This package is still working in progress, more types would be added. Welcome an
 - Janus
 - Random Shapes
 - Color Circle
+- Color Circle2
 
 For these kinds of art, the package provides as many as parameters to control the appearance.
 
@@ -51,6 +52,7 @@ NewPointRibbon(r float64)
 NewJanus(n int, decay float64)
 NewRandomShape(shapeNum int)
 NewColorCircle(circleNum int)
+NewColorCircle2(circleNum int)
 ```
 
 ## General Options
@@ -117,25 +119,22 @@ func main() {
 func main() {
 	rand.Seed(time.Now().Unix())
 	colors := []color.RGBA{
-		{0xFF, 0xC6, 0x18, 0xFF},
+		{0x11, 0x60, 0xC6, 0xFF},
-		{0xF4, 0x25, 0x39, 0xFF},
+		{0xFD, 0xD9, 0x00, 0xFF},
-		{0x41, 0x78, 0xF4, 0xFF},
+		{0xF5, 0xB4, 0xF8, 0xFF},
-		{0xFE, 0x84, 0xFE, 0xFF},
+		{0xEF, 0x13, 0x55, 0xFF},
-		{0xFF, 0x81, 0x19, 0xFF},
+		{0xF4, 0x9F, 0x0A, 0xFF},
-		{0x56, 0xAC, 0x51, 0xFF},
-		{0x98, 0x19, 0xFA, 0xFF},
-		{0xFF, 0xFF, 0xFF, 0xFF},
 	}
-	c := generativeart.NewCanva(1000, 1000)
+	c := generativeart.NewCanva(800, 800)
 	c.SetBackground(generativeart.White)
 	c.FillBackground()
 	c.SetColorSchema(colors)
-	c.Draw(generativeart.NewColorCircle(500))
+	c.Draw(generativeart.NewColorCircle2(30))
-	c.ToPNG("colorcircle.png")
+	c.ToPNG("colorcircle2.png")
 }
 ```
 
-![](images/colorcircle.png)
+![](images/colorcircle2.png)
 
 ### Silk Smoke
 

colorcircle2.go

@@ -0,0 +1,61 @@
+package generativeart
+
+import (
+	"github.com/fogleman/gg"
+	"math"
+	"math/rand"
+)
+
+type colorCircle2 struct {
+	circleNum int
+}
+
+// NewColorCircle2 returns a colorCircle2 object.
+func NewColorCircle2(circleNum int) *colorCircle2 {
+	return &colorCircle2{
+		circleNum: circleNum,
+	}
+}
+
+// Generative draws a color circle image.
+func (cc *colorCircle2) Generative(c *canva) {
+	ctex := gg.NewContextForRGBA(c.img)
+
+	for i := 0; i < cc.circleNum; i++ {
+		x := RandomRangeFloat64(0, float64(c.width))
+		y := RandomRangeFloat64(0, float64(c.height))
+
+		r1 := RandomRangeFloat64(50.0, float64(c.width)/4)
+		r2 := RandomRangeFloat64(10.0, float64(c.width)/3)
+
+		cc.circle(ctex, c, x, y, r1, r2)
+		if rand.Float64() < 0.3 {
+			col := c.opts.colorSchema[rand.Intn(len(c.opts.colorSchema))]
+			ctex.SetColor(col)
+			ctex.DrawCircle(x, y, r1/2.0)
+			ctex.Fill()
+		}
+	}
+}
+
+func (cc *colorCircle2) circle(ctex *gg.Context, c *canva, x, y, d, dx float64) {
+	col := c.opts.colorSchema[rand.Intn(len(c.opts.colorSchema))]
+
+	for j := 0.0; j < dx; j += 1.0 {
+		dd := d + j*2.0
+		alpha := int((dx / j) * 255.0)
+		if alpha > 255 {
+			alpha = 255
+		}
+		col.A = uint8(alpha)
+
+		ctex.SetColor(col)
+		for i := 0; i < 150; i++ {
+			theta := RandomRangeFloat64(0, math.Pi*2)
+			xx := x + dd*0.5*math.Cos(theta)
+			yy := y + dd*0.5*math.Sin(theta)
+			ctex.DrawPoint(xx, yy, 0.51)
+			ctex.Fill()
+		}
+	}
+}

example/example_colorcircle2.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{
+		{0x11, 0x60, 0xC6, 0xFF},
+		{0xFD, 0xD9, 0x00, 0xFF},
+		{0xF5, 0xB4, 0xF8, 0xFF},
+		{0xEF, 0x13, 0x55, 0xFF},
+		{0xF4, 0x9F, 0x0A, 0xFF},
+	}
+	c := generativeart.NewCanva(800, 800)
+	c.SetBackground(generativeart.White)
+	c.FillBackground()
+	c.SetColorSchema(colors)
+	c.Draw(generativeart.NewColorCircle2(30))
+	c.ToPNG("colorcircle2.png")
+}