zeni/go-chart
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pie charts!

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This commit is contained in:
Will Charczuk 2016-07-28 02:34:44 -07:00
parent ec4d92fc5e
commit c17c9a4bb4
10 changed files with 485 additions and 45 deletions
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8
drawing/path.go
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@ -101,10 +101,10 @@ func (p *Path) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) {
}
// ArcTo adds an arc to the path
func (p *Path) ArcTo(cx, cy, rx, ry, startAngle, angle float64) {
endAngle := startAngle + angle
func (p *Path) ArcTo(cx, cy, rx, ry, startAngle, delta float64) {
endAngle := startAngle + delta
clockWise := true
if angle < 0 {
if delta < 0 {
clockWise = false
}
// normalize
@ -124,7 +124,7 @@ func (p *Path) ArcTo(cx, cy, rx, ry, startAngle, angle float64) {
} else {
p.MoveTo(startX, startY)
}
p.appendToPath(ArcToComponent, cx, cy, rx, ry, startAngle, angle)
p.appendToPath(ArcToComponent, cx, cy, rx, ry, startAngle, delta)
p.x = cx + math.Cos(endAngle)*rx
p.y = cy + math.Sin(endAngle)*ry
}

4
drawing/stack_graphic_context.go
View file

@ -171,8 +171,8 @@ func (gc *StackGraphicContext) CubicCurveTo(cx1, cy1, cx2, cy2, x, y float64) {
}
// ArcTo draws an arc.
func (gc *StackGraphicContext) ArcTo(cx, cy, rx, ry, startAngle, angle float64) {
gc.current.Path.ArcTo(cx, cy, rx, ry, startAngle, angle)
func (gc *StackGraphicContext) ArcTo(cx, cy, rx, ry, startAngle, delta float64) {
gc.current.Path.ArcTo(cx, cy, rx, ry, startAngle, delta)
}
// Close closes a path.