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Add Rect.AnchorTo()

This commit is contained in:
Nathanaël Jourdane 2020-08-10 17:25:09 +02:00
parent 2c79e7325a
commit 50e1d8c96b
1 changed files with 9 additions and 3 deletions
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12
geometry.go
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@ -548,7 +548,7 @@ func (r Rect) Edges() [4]Line {
}
// AnchorPos enumerates available anchor positions, such as `Center`, `Top`, `TopRight`, etc.
type AnchorPos struct{ v Vec }
type AnchorPos struct{ Val Vec }
var (
Center = AnchorPos{V(0.5, 0.5)}
@ -590,8 +590,14 @@ func (anchorPos AnchorPos) String() string {
// AnchorPos returns the position of the given anchor of the Rect.
func (r *Rect) AnchorPos(anchor AnchorPos) Vec {
// func (u Vec) ScaledXY(v Vec) Vec {
return r.Min.Add(r.Size().ScaledXY(anchor.v))
return r.Min.Add(r.Size().ScaledXY(anchor.Val))
}
// AnchorTo updates the Rect position to align it on the given anchor.
func (r *Rect) AnchorTo(anchor AnchorPos) {
size := r.Size()
r.Min = r.Min.Sub(size.ScaledXY(anchor.Val))
r.Max = r.Max.Sub(size.ScaledXY(anchor.Val))
}
// Center returns the position of the center of the Rect.