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DrawRoundedRectangle

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This commit is contained in:
Michael Fogleman 2016-02-19 21:15:22 -05:00
parent 43258d7dd7
commit abe835c734
2 changed files with 15 additions and 0 deletions
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1
README.md
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@ -42,6 +42,7 @@ or circles? What a pain!
```go
DrawLine(x1, y1, x2, y2 float64)
DrawRectangle(x, y, w, h float64)
DrawRoundedRectangle(x, y, w, h, r float64)
DrawCircle(x, y, r float64)
DrawArc(x, y, r, angle1, angle2 float64)
DrawEllipse(x, y, rx, ry float64)

14
context.go
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@ -274,6 +274,20 @@ func (dc *Context) DrawRectangle(x, y, w, h float64) {
dc.LineTo(x, y)
}
func (dc *Context) DrawRoundedRectangle(x, y, w, h, r float64) {
x0, x1, x2, x3 := x, x+r, x+w-r, x+w
y0, y1, y2, y3 := y, y+r, y+h-r, y+h
dc.MoveTo(x1, y0)
dc.LineTo(x2, y0)
dc.DrawArc(x2, y1, r, Radians(270), Radians(360))
dc.LineTo(x3, y2)
dc.DrawArc(x2, y2, r, Radians(0), Radians(90))
dc.LineTo(x1, y3)
dc.DrawArc(x1, y2, r, Radians(90), Radians(180))
dc.LineTo(x0, y1)
dc.DrawArc(x1, y1, r, Radians(180), Radians(270))
}
func (dc *Context) DrawEllipticalArc(x, y, rx, ry, angle1, angle2 float64) {
const n = 16
for i := 0; i < n; i++ {