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Added point (PointF) subtraction.

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This commit is contained in:
Sander Schobers 2017-11-06 22:14:48 +01:00
parent 20f0bf7b1f
commit bdfa821989
1 changed files with 6 additions and 1 deletions
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7
pointf.go
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@ -28,11 +28,16 @@ func (p PointF) To32() PointF32 {
return PointF32{float32(p.X), float32(p.Y)} return PointF32{float32(p.X), float32(p.Y)}
} }
// Add adds q as a vector to p // Add adds q as a vector to p.
func (p PointF) Add(q PointF) PointF { func (p PointF) Add(q PointF) PointF {
return PointF{p.X + q.X, p.Y + q.Y} return PointF{p.X + q.X, p.Y + q.Y}
} }
// Sub subtracts q as a vector from p.
func (p PointF) Sub(q PointF) PointF {
return PointF{p.X - q.X, p.Y - q.Y}
}
// AngleTo calculates the angle [0..2*Pi) from point p to point q. // AngleTo calculates the angle [0..2*Pi) from point p to point q.
func (p PointF) AngleTo(q PointF) float64 { func (p PointF) AngleTo(q PointF) float64 {
a := math.Atan((p.Y - q.Y) / (p.X - q.X)) a := math.Atan((p.Y - q.Y) / (p.X - q.X))