func randomQuadratic(dc *gg.Context) {
x0, y0 := point()
x1, y1 := point()
x2, y2 := point()
dc.MoveTo(x0, y0)
dc.QuadraticTo(x1, y1, x2, y2)
drawCurve(dc)
dc.MoveTo(x0, y0)
dc.LineTo(x1, y1)
//dc.LineTo(x2, y2)
drawPoints(dc)
}
func randomCubic(dc *gg.Context) {
x0, y0 := point()
x1, y1 := point()
x2, y2 := point()
x3, y3 := point()
dc.MoveTo(x0, y0)
dc.CubicTo(x1, y1, x2, y2, x3, y3)
drawCurve(dc)
dc.MoveTo(x0, y0)
dc.LineTo(x1, y1)
dc.LineTo(x2, y2)
dc.LineTo(x3, y3)
drawPoints(dc)
}
func (p *Path) draw(gc *gg.Context, trans *transformer) {
if len(p.Positions) <= 1 {
return
}
gc.ClearPath()
gc.SetLineWidth(p.Weight)
gc.SetLineCap(gg.LineCapRound)
gc.SetLineJoin(gg.LineJoinRound)
for _, ll := range p.Positions {
gc.LineTo(trans.ll2p(ll))
}
gc.SetColor(p.Color)
gc.Stroke()
}
func (m *Marker) draw(gc *gg.Context, trans *transformer) {
gc.ClearPath()
gc.SetLineJoin(gg.LineJoinRound)
gc.SetLineWidth(1.0)
radius := 0.5 * m.Size
x, y := trans.ll2p(m.Position)
gc.DrawArc(x, y-m.Size, radius, (90.0+60.0)*math.Pi/180.0, (360.0+90.0-60.0)*math.Pi/180.0)
gc.LineTo(x, y)
gc.ClosePath()
gc.SetColor(m.Color)
gc.FillPreserve()
gc.SetRGB(0, 0, 0)
gc.Stroke()
if m.Label != "" {
if Luminance(m.Color) >= 0.5 {
gc.SetColor(color.RGBA{0x00, 0x00, 0x00, 0xff})
} else {
gc.SetColor(color.RGBA{0xff, 0xff, 0xff, 0xff})
}
gc.DrawStringAnchored(m.Label, x, y-m.Size, 0.5, 0.5)
}
}