64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package arts
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import (
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"github.com/fogleman/gg"
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"github.com/jdxyw/generativeart"
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"github.com/jdxyw/generativeart/common"
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"math"
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"math/rand"
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)
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type colorCircle2 struct {
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circleNum int
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}
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// NewColorCircle2 returns a colorCircle2 object.
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func NewColorCircle2(circleNum int) *colorCircle2 {
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return &colorCircle2{
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circleNum: circleNum,
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}
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}
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// Generative draws a color circle image.
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func (cc *colorCircle2) Generative(c *generativeart.Canva) {
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ctex := gg.NewContextForRGBA(c.Img())
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for i := 0; i < cc.circleNum; i++ {
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x := common.RandomRangeFloat64(0, float64(c.Width()))
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y := common.RandomRangeFloat64(0, float64(c.Height()))
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r1 := common.RandomRangeFloat64(50.0, float64(c.Width())/4)
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r2 := common.RandomRangeFloat64(10.0, float64(c.Width())/3)
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cc.circle(ctex, c, x, y, r1, r2)
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if rand.Float64() < 0.3 {
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col := c.Opts().ColorSchema()[rand.Intn(len(c.Opts().ColorSchema()))]
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ctex.SetColor(col)
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ctex.DrawCircle(x, y, r1/2.0)
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ctex.Fill()
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}
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}
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}
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func (cc *colorCircle2) circle(ctex *gg.Context, c *generativeart.Canva, x, y, d, dx float64) {
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col := c.Opts().ColorSchema()[rand.Intn(len(c.Opts().ColorSchema()))]
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for j := 0.0; j < dx; j += 1.0 {
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dd := d + j*2.0
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alpha := int((dx / j) * 255.0)
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if alpha > 255 {
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alpha = 255
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}
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col.A = uint8(alpha)
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ctex.SetColor(col)
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for i := 0; i < 150; i++ {
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theta := common.RandomRangeFloat64(0, math.Pi*2)
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xx := x + dd*0.5*math.Cos(theta)
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yy := y + dd*0.5*math.Sin(theta)
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ctex.DrawPoint(xx, yy, 0.51)
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ctex.Fill()
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}
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}
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}
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