69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package engine
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import "image"
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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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// Disabled implements Disabler directly (as a bool).
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type Disabled bool
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// IsHidden returns h as a bool.
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func (d Disabled) IsDisabled() bool { return bool(d) }
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// Hide sets h to true.
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func (d *Disabled) Disable() { *d = true }
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// Show sets h to false.
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func (d *Disabled) Enable() { *d = false }
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// Hidden implements Hider directly (as a bool).
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type Hidden bool
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// IsHidden returns h as a bool.
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func (h Hidden) IsHidden() bool { return bool(h) }
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// Hide sets h to true.
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func (h *Hidden) Hide() { *h = true }
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// Show sets h to false.
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func (h *Hidden) Show() { *h = false }
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// Parallax implements ParallaxScaler directly (as a float64 value).
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type Parallax float64
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// ParallaxFactor returns s as a float64.
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func (s Parallax) ParallaxFactor() float64 { return float64(s) }
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// ZOrder implements DrawOrder (in Drawer) directly (as a float64 value).
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type ZOrder float64
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// DrawOrder returns z as a float64.
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func (z ZOrder) DrawOrder() float64 { return float64(z) }
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// Some math helpers
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func mul2(p, q image.Point) image.Point {
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p.X *= q.X
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p.Y *= q.Y
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return p
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}
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func div2(p, q image.Point) image.Point {
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p.X /= q.X
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p.Y /= q.Y
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return p
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}
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func float2(p image.Point) (float64, float64) {
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return float64(p.X), float64(p.Y)
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}
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