29 lines
727 B
Go
29 lines
727 B
Go
package core
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import (
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"math"
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"github.com/egoist/mygo/ui"
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"github.com/ZacharyZhang-NY/MujicaUI/internal"
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)
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// ProgressArc is the arc from turn a to turn b, clockwise from twelve o'clock.
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func ProgressArc(pt *ui.Painter, cx, cy, r float32, a, b float32) *ui.Path {
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var p ui.Path
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n := max(2, int(math.Ceil(float64((b-a)*64))))
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for i := 0; i <= n; i++ {
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t := float64(a + (b-a)*float32(i)/float32(n))
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x := cx + r*float32(math.Sin(2*math.Pi*t))
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y := cy - r*float32(math.Cos(2*math.Pi*t))
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if i == 0 {
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p.MoveTo(internal.Snap(pt, x), internal.Snap(pt, y))
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} else {
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p.LineTo(internal.Snap(pt, x), internal.Snap(pt, y))
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}
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}
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return &p
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}
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func Abs32(v float32) float32 { return float32(math.Abs(float64(v))) }
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