gg/examples/spiral.go

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414 B
Go
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2016-02-21 23:04:23 +01:00
package main
import (
"math"
"github.com/fogleman/gg"
)
func main() {
const S = 1024
const N = 2048
dc := gg.NewContext(S, S)
dc.SetRGB(1, 1, 1)
dc.Clear()
dc.SetRGB(0, 0, 0)
for i := 0; i <= N; i++ {
t := float64(i) / N
d := t*S*0.4 + 10
a := t * math.Pi * 2 * 20
x := S/2 + math.Cos(a)*d
y := S/2 + math.Sin(a)*d
r := t * 8
dc.DrawCircle(x, y, r)
}
dc.Fill()
dc.SavePNG("out.png")
}