28 lines
561 B
Go
28 lines
561 B
Go
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package utils
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import (
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"fmt"
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"math"
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)
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// coords returns the coordinates for the given percentage.
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func coords(percent float64) (float64, float64) {
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x := math.Cos(2 * math.Pi * percent)
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y := math.Sin(2 * math.Pi * percent)
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return x, y
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}
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// SVGSlicePath creates a path string for a slice in a pie chart.
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func SVGSlicePath(from float64, to float64) string {
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x1, y1 := coords(from)
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x2, y2 := coords(to)
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largeArc := "0"
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if to-from > 0.5 {
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largeArc = "1"
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}
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return fmt.Sprintf("M %.3f %.3f A 1 1 0 %s 1 %.3f %.3f L 0 0", x1, y1, largeArc, x2, y2)
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}
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