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vector: Add comments

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Hajime Hoshi 2020-03-16 23:49:55 +09:00
parent 1fdab58ff5
commit d256eaa846
1 changed files with 5 additions and 0 deletions
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5
vector/path.go
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@ -55,6 +55,7 @@ func (p *Path) LineTo(x, y float32) {
p.cur = triangulate.Point{X: x, Y: y} p.cur = triangulate.Point{X: x, Y: y}
} }
// nseg returns a number of segments based on the given two points (x0, y0) and (x1, y1).
func nseg(x0, y0, x1, y1 float32) int { func nseg(x0, y0, x1, y1 float32) int {
distx := x1 - x0 distx := x1 - x0
if distx < 0 { if distx < 0 {
@ -72,6 +73,7 @@ func nseg(x0, y0, x1, y1 float32) int {
return int(math.Ceil(float64(dist))) return int(math.Ceil(float64(dist)))
} }
// QuadTo adds a quadratic Bézier curve to the path.
func (p *Path) QuadTo(cpx, cpy, x, y float32) { func (p *Path) QuadTo(cpx, cpy, x, y float32) {
c := p.cur c := p.cur
num := nseg(c.X, c.Y, x, y) num := nseg(c.X, c.Y, x, y)
@ -82,6 +84,7 @@ func (p *Path) QuadTo(cpx, cpy, x, y float32) {
} }
} }
// CubicTo adds a cubic Bézier curve to the path.
func (p *Path) CubicTo(cp0x, cp0y, cp1x, cp1y, x, y float32) { func (p *Path) CubicTo(cp0x, cp0y, cp1x, cp1y, x, y float32) {
c := p.cur c := p.cur
num := nseg(c.X, c.Y, x, y) num := nseg(c.X, c.Y, x, y)
@ -92,7 +95,9 @@ func (p *Path) CubicTo(cp0x, cp0y, cp1x, cp1y, x, y float32) {
} }
} }
// FillOptions represents options to fill a path.
type FillOptions struct { type FillOptions struct {
// Color is a color to fill with.
Color color.Color Color color.Color
} }