sine

2016-02-20 15:42:59 -05:00 · 2016-02-20 15:42:59 -05:00 · 215984bf96
parent a46d144fed
commit 215984bf96
1 changed files with 29 additions and 0 deletions
--- a/examples/sine.go
+++ b/examples/sine.go
@ -0,0 +1,29 @@
+package main
+
+import (
+	"math"
+
+	"github.com/fogleman/gg"
+)
+
+func main() {
+	const W = 1200
+	const H = 60
+	dc := gg.NewContext(W, H)
+	// dc.SetHexColor("#FFFFFF")
+	// dc.Clear()
+	dc.ScaleAbout(0.95, 0.75, W/2, H/2)
+	for i := 0; i < W; i++ {
+		a := float64(i) * 2 * math.Pi / W * 8
+		x := float64(i)
+		y := (math.Sin(a) + 1) / 2 * H
+		dc.LineTo(x, y)
+	}
+	dc.ClosePath()
+	dc.SetHexColor("#3E606F")
+	dc.FillPreserve()
+	dc.SetHexColor("#19344180")
+	dc.SetLineWidth(8)
+	dc.Stroke()
+	dc.SavePNG("out.png")
+}