69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package engine
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import (
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"image"
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)
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// ID implements Identifier directly (as a string value).
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type ID string
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// Ident returns id as a string.
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func (id ID) Ident() string { return string(id) }
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// Bounds implements Bounder directly (as an image.Rectangle value).
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type Bounds image.Rectangle
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// BoundingRect returns b as an image.Rectangle.
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func (b Bounds) BoundingRect() image.Rectangle { return image.Rectangle(b) }
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// Disables implements Disabler directly (as a bool).
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type Disables bool
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// Disabled returns d as a bool.
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func (d Disables) Disabled() bool { return bool(d) }
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// Disable sets d to true.
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func (d *Disables) Disable() { *d = true }
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// Enable sets d to false.
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func (d *Disables) Enable() { *d = false }
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// Hides implements Hider directly (as a bool).
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type Hides bool
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// Hidden returns h as a bool.
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func (h Hides) Hidden() bool { return bool(h) }
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// Hide sets h to true.
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func (h *Hides) Hide() { *h = true }
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// Show sets h to false.
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func (h *Hides) Show() { *h = false }
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// ZPosition implements DrawAfter and DrawBefore using only Z information.
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type ZPosition int
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// DrawAfter reports if z >= x.Max.Z.
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func (z ZPosition) DrawAfter(x Drawer) bool {
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switch x := x.(type) {
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case BoundingBoxer:
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return int(z) >= x.BoundingBox().Max.Z
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case ZPositioner:
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return z.ZPos() > x.ZPos()
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}
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return false
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}
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// DrawBefore reports if z < x.Min.Z.
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func (z ZPosition) DrawBefore(x Drawer) bool {
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switch x := x.(type) {
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case BoundingBoxer:
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return int(z) < x.BoundingBox().Min.Z
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case ZPositioner:
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return z.ZPos() < x.ZPos()
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}
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return false
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}
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// ZPos returns itself.
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func (z ZPosition) ZPos() int { return int(z) }
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