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Add Anchor.Opposite() func

This commit is contained in:
Nathanael Jourdane 2020-08-12 17:25:43 +02:00
parent 2342984744
commit c9681cec8a
1 changed files with 23 additions and 6 deletions
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29
geometry.go
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@ -553,13 +553,13 @@ type Anchor Vec
var ( var (
Center = Anchor{0.5, 0.5} Center = Anchor{0.5, 0.5}
Top = Anchor{0.5, 0} Top = Anchor{0.5, 0}
TopRight = Anchor{0, 0} TopRight = Anchor{0, 0}
Right = Anchor{0, 0.5} Right = Anchor{0, 0.5}
BottomRight = Anchor{0, 1} BottomRight = Anchor{0, 1}
Bottom = Anchor{0.5, 1} Bottom = Anchor{0.5, 1}
BottomLeft = Anchor{1, 1} BottomLeft = Anchor{1, 1}
Left = Anchor{1, 0.5} Left = Anchor{1, 0.5}
TopLeft = Anchor{1, 0} TopLeft = Anchor{1, 0}
) )
var anchorStrings map[Anchor]string = map[Anchor]string{ var anchorStrings map[Anchor]string = map[Anchor]string{
@ -579,6 +579,23 @@ func (anchor Anchor) String() string {
return anchorStrings[anchor] return anchorStrings[anchor]
} }
var oppositeAnchors map[Anchor]Anchor = map[Anchor]Anchor{
Center: Center,
Top: Bottom,
Bottom: Top,
Right: Left,
Left: Right,
TopRight: BottomLeft,
BottomLeft: TopRight,
BottomRight: TopLeft,
TopLeft: BottomRight,
}
// Opposite returns the opposite position of the anchor (ie. Top -> Bottom; BottomLeft -> TopRight, etc.).
func (anchor Anchor) Opposite() Anchor {
return oppositeAnchors[anchor]
}
// AnchorPos returns the relative position of the given anchor. // AnchorPos returns the relative position of the given anchor.
func (r Rect) AnchorPos(anchor Anchor) Vec { func (r Rect) AnchorPos(anchor Anchor) Vec {
return r.Size().ScaledXY(V(0, 0).Sub(Vec(anchor))) return r.Size().ScaledXY(V(0, 0).Sub(Vec(anchor)))