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Add DistanceToLine function

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Sasha Koshka 2024-06-25 01:55:28 -04:00
parent c1c166efcf
commit 1f04d688cf
1 changed files with 15 additions and 0 deletions
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15
image/path/path.go
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@ -59,6 +59,21 @@ func Distance (start, end image.Point) float64 {
return math.Sqrt(float64(delta.X * delta.X) + float64(delta.Y * delta.Y)) return math.Sqrt(float64(delta.X * delta.X) + float64(delta.Y * delta.Y))
} }
// DistanceToLine calculates the distance from a point to a line which passes
// through points line1 and line2.
func DistanceToLine (point, line1, line2 image.Point) float64 {
x := float64(point.X)
y := float64(point.Y)
x1 := float64(line1.X)
y1 := float64(line1.Y)
x2 := float64(line2.X)
y2 := float64(line2.Y)
triangle := math.Abs((y2 - y1)*x - (x2 - x1)*y + x2*y1 - y2*x1)
return triangle / Distance(line1, line2)
}
func lerp (fac float64, x, y int) int { func lerp (fac float64, x, y int) int {
return int(float64(x) * fac + float64(y) * (1.0 - fac)) return int(float64(x) * fac + float64(y) * (1.0 - fac))
} }