65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
|
package generativeart
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/fogleman/gg"
|
||
|
|
"github.com/jdxyw/generativeart/common"
|
||
|
|
"image"
|
||
|
|
"image/color"
|
||
|
|
"image/draw"
|
||
|
|
"math"
|
||
|
|
)
|
||
|
|
|
||
|
|
type solarFlare struct {
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewSolarFlare() *solarFlare {
|
||
|
|
return &solarFlare{}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// Generative draws a solar flare images.
|
||
|
|
func (o *solarFlare) Generative(c *canva) {
|
||
|
|
var xOffset, yOffset float64
|
||
|
|
var offsetInc = 0.006
|
||
|
|
var inc = 1.0
|
||
|
|
var r = 1.0
|
||
|
|
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)
|
||
|
|
ctex := gg.NewContextForRGBA(img)
|
||
|
|
|
||
|
|
ctex.Push()
|
||
|
|
ctex.Translate(float64(c.width/2), float64(c.height/2))
|
||
|
|
ctex.SetLineWidth(1.0)
|
||
|
|
ctex.SetColor(c.opts.lineColor)
|
||
|
|
|
||
|
|
for j :=0.0; j<float64(nPoints+1); j+=1.0 {
|
||
|
|
a := j/float64(nPoints) * math.Pi * 2
|
||
|
|
px := math.Cos(a)
|
||
|
|
py := math.Sin(a)
|
||
|
|
n := noise.Noise2D(xOffset + px * inc, yOffset + py * inc)*r
|
||
|
|
px *= n
|
||
|
|
py *= n
|
||
|
|
ctex.LineTo(px, py)
|
||
|
|
}
|
||
|
|
ctex.Stroke()
|
||
|
|
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
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|