37 lines
971 B
Go
37 lines
971 B
Go
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package engine
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import (
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"image"
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"github.com/hajimehoshi/ebiten/v2"
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)
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// Transform is a bucket of things that affect drawing.
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type Transform struct {
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// IsoProjection is used by isometric 3D components to project their
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// coordinates into 2D. There's usually only one component in the tree that
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// sets this field, but it would apply to all descendants.
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IsoProjection image.Point
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// Opts contains the 2D geometry matrix, the colour matrix, filter mode, and
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// composition mode.
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Opts ebiten.DrawImageOptions
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}
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// Concat returns the combined transform (a transform equivalent to applying t
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// and then u).
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func (t Transform) Concat(u Transform) Transform {
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if u.IsoProjection != (image.Point{}) {
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t.IsoProjection = u.IsoProjection
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}
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t.Opts.ColorM.Concat(u.Opts.ColorM)
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t.Opts.GeoM.Concat(u.Opts.GeoM)
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if u.Opts.CompositeMode != 0 {
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t.Opts.CompositeMode = u.Opts.CompositeMode
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}
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if u.Opts.Filter != 0 {
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t.Opts.Filter = u.Opts.Filter
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}
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return t
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}
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