Created
July 1, 2018 23:53
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Clifford Attractor Animation
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// after running this program you can run | |
// ffmpeg -framerate 30 -i out/%06d.jpg -c:v libx264 -r 30 -pix_fmt yuv420p out2.mp4 | |
package main | |
import ( | |
"fmt" | |
"image" | |
"image/color" | |
"image/jpeg" | |
"math" | |
"os" | |
) | |
func makeFrame(a float64, b float64, c float64, d float64, i int) { | |
width := 2000.0 | |
height := 2000.0 | |
img := image.NewRGBA(image.Rect(0, 0, int(width), int(height))) | |
x := 0.0 | |
y := 0.0 | |
for i := 0; i < 1000000; i++ { | |
x2 := math.Sin(a*y) + c*math.Cos(a*x) | |
y2 := math.Sin(b*x) + d*math.Cos(b*y) | |
x = x2 | |
y = y2 | |
img.Set(int(x*width/4+width/2), int(y*width/4+width/2), color.RGBA{0, 255, 0, 255}) | |
} | |
f, _ := os.OpenFile(fmt.Sprintf("out/%06d.jpg", i), os.O_WRONLY|os.O_CREATE, 0600) | |
defer f.Close() | |
options := jpeg.Options{ | |
Quality: 95, | |
} | |
jpeg.Encode(f, img, &options) | |
} | |
func interpolate(n1 float64, n2 float64, i int, n int) float64 { | |
return n1 + (n2-n1)/float64(n)*float64(i) | |
} | |
func main() { | |
a1 := -1.4 | |
a2 := -1.2 | |
b1 := 1.6 | |
b2 := 1.9 | |
c1 := 1.0 | |
c2 := 1.4 | |
d1 := 0.7 | |
d2 := 0.9 | |
maxGoroutines := 8 | |
guard := make(chan struct{}, maxGoroutines) | |
numFrames := 1000 | |
for i := 0; i < numFrames; i++ { | |
guard <- struct{}{} | |
go func(i int) { | |
fmt.Println("Frame", i, "start") | |
makeFrame( | |
interpolate(a1, a2, i, numFrames), | |
interpolate(b1, b2, i, numFrames), | |
interpolate(c1, c2, i, numFrames), | |
interpolate(d1, d2, i, numFrames), | |
i, | |
) | |
fmt.Println("Frame", i, "done") | |
<-guard | |
}(i) | |
} | |
} |
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