85 lines
1.3 KiB
Go
85 lines
1.3 KiB
Go
package main
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import (
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"math/rand"
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"github.com/fogleman/gg"
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)
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func random() float64 {
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return rand.Float64()*2 - 1
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}
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func point() (x, y float64) {
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return random(), random()
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}
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func drawCurve(dc *gg.Context) {
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dc.SetRGBA(0, 0, 0, 0.1)
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dc.FillPreserve()
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dc.SetRGB(0, 0, 0)
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dc.SetLineWidth(12)
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dc.Stroke()
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}
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func drawPoints(dc *gg.Context) {
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dc.SetRGBA(1, 0, 0, 0.5)
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dc.SetLineWidth(2)
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dc.Stroke()
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}
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func randomQuadratic(dc *gg.Context) {
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x0, y0 := point()
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x1, y1 := point()
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x2, y2 := point()
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dc.MoveTo(x0, y0)
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dc.QuadraticTo(x1, y1, x2, y2)
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drawCurve(dc)
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dc.MoveTo(x0, y0)
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dc.LineTo(x1, y1)
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dc.LineTo(x2, y2)
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drawPoints(dc)
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}
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func randomCubic(dc *gg.Context) {
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x0, y0 := point()
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x1, y1 := point()
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x2, y2 := point()
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x3, y3 := point()
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dc.MoveTo(x0, y0)
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dc.CubicTo(x1, y1, x2, y2, x3, y3)
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drawCurve(dc)
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dc.MoveTo(x0, y0)
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dc.LineTo(x1, y1)
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dc.LineTo(x2, y2)
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dc.LineTo(x3, y3)
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drawPoints(dc)
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}
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func main() {
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const (
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S = 256
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W = 8
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H = 8
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)
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dc := gg.NewContext(S*W, S*H)
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dc.SetRGB(1, 1, 1)
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dc.Clear()
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for j := 0; j < H; j++ {
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for i := 0; i < W; i++ {
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x := float64(i)*S + S/2
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y := float64(j)*S + S/2
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dc.Push()
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dc.Translate(x, y)
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dc.Scale(S/2, S/2)
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if j%2 == 0 {
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randomCubic(dc)
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} else {
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randomQuadratic(dc)
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}
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dc.Pop()
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}
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}
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dc.SavePNG("out.png")
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}
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