Ilia Denisov
21 lines
433 B
Go
21 lines
433 B
Go
package calc
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import "math"
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// shortest distance between points on torus map
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func ShortDistance(w, h uint32, x1, y1, x2, y2 float64) float64 {
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return math.Hypot(Deltas(w, h, x1, y1, x2, y2))
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}
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func Deltas(w, h uint32, x1, y1, x2, y2 float64) (float64, float64) {
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dx := math.Abs(x2 - x1)
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dy := math.Abs(y2 - y1)
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if dx > float64(w/2) {
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dx = float64(h) - dx
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}
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if dy > float64(h/2) {
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dy = float64(h) - dy
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}
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return dx, dy
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}
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