57 lines
1.1 KiB
Go
57 lines
1.1 KiB
Go
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package gg
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type Liner interface {
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Line() Line
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}
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type LinerPointContainer interface {
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Liner
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PointContainer
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}
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// The type represents the cross of 2 Liners.
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type LineCross struct {
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Pair [2]Line
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Point Point
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}
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// Check if two LinerPointContainers do cross and return the
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// crossing point.
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func LinersCross(lp1, lp2 LinerPointContainer) (LineCross, bool) {
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l1 := lp1.Line()
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l2 := lp2.Line()
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crossPt, doCross := l1.crossesLine(l2)
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if !doCross ||
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len(lp1.ContainedPoints([]Point{crossPt}))==0 ||
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len(lp2.ContainedPoints([]Point{crossPt}))==0 {
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return LineCross{}, false
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}
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return LineCross{
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Pair: [2]Line{l1, l2},
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Point: crossPt,
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}, true
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}
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// Check whether the liner is parallel to the other liner.
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func LinersParallel(first, second Liner) bool {
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l1 := first.Line()
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l2 := second.Line()
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return l1.K == l2.K
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}
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// Returns angle between liners in radians.
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// The value fits the -Pi < Value < Pi condition.
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func LinersAngle(first, second Liner) Float {
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l1 := first.Line()
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l2 := second.Line()
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if l1.K == l2.K {
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return 0
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}
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return Atan(l1.K/l2.K)
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}
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