gg/examples/quadratic.go

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package main
import "github.com/fogleman/gg"
func main() {
const S = 1000
dc := gg.NewContext(S, S)
dc.SetRGB(1, 1, 1)
dc.Clear()
dc.Translate(S/2, S/2)
dc.Scale(40, 40)
var x0, y0, x1, y1, x2, y2, x3, y3, x4, y4 float64
x0, y0 = -10, 0
x1, y1 = -5, -10
x2, y2 = 0, 0
x3, y3 = 5, 10
x4, y4 = 10, 0
dc.MoveTo(x0, y0)
dc.LineTo(x1, y1)
dc.LineTo(x2, y2)
dc.LineTo(x3, y3)
dc.LineTo(x4, y4)
dc.SetHexColor("FF2D00")
dc.SetLineWidth(8)
dc.Stroke()
dc.MoveTo(x0, y0)
dc.QuadraticTo(x1, y1, x2, y2)
dc.QuadraticTo(x3, y3, x4, y4)
dc.SetHexColor("3E606F")
dc.SetLineWidth(16)
dc.FillPreserve()
dc.SetRGB(0, 0, 0)
dc.Stroke()
dc.DrawCircle(x0, y0, 0.5)
dc.DrawCircle(x1, y1, 0.5)
dc.DrawCircle(x2, y2, 0.5)
dc.DrawCircle(x3, y3, 0.5)
dc.DrawCircle(x4, y4, 0.5)
dc.SetRGB(1, 1, 1)
dc.FillPreserve()
dc.SetRGB(0, 0, 0)
dc.SetLineWidth(4)
dc.Stroke()
dc.LoadFontFace("/Library/Fonts/Arial.ttf", 200)
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dc.DrawStringAnchored("g", -5, 5, 0.5, 0.5)
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dc.DrawStringAnchored("G", 5, -5, 0.5, 0.5)
dc.SavePNG("out.png")
}