28 lines
561 B
Go

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