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affine: Add Reset function
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@ -33,6 +33,11 @@ type ColorM struct {
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impl affine.ColorM
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}
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// Reset resets the ColorM as identity.
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func (c *ColorM) Reset() {
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c.impl.Reset()
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}
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// Concat multiplies a color matrix with the other color matrix.
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// This is same as muptiplying the matrix other and the matrix c in this order.
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func (c *ColorM) Concat(other ColorM) {
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@ -110,7 +110,7 @@ func update(screen *ebiten.Image) error {
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}
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for i := 0; i < sprites.num; i++ {
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s := sprites.sprites[i]
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op.GeoM = ebiten.GeoM{}
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op.GeoM.Reset()
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op.GeoM.Translate(float64(s.x), float64(s.y))
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screen.DrawImage(ebitenImage, op)
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}
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5
geom.go
5
geom.go
@ -28,6 +28,11 @@ type GeoM struct {
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impl affine.GeoM
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}
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// Reset resets the GeoM as identity.
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func (g *GeoM) Reset() {
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g.impl.Reset()
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}
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// Element returns a value of a matrix at (i, j).
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func (g *GeoM) Element(i, j int) float64 {
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a, b, c, d, tx, ty := g.impl.Elements()
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@ -44,6 +44,10 @@ type ColorM struct {
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elements []float64
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}
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func (c *ColorM) Reset() {
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c.elements = nil
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}
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func (c *ColorM) UnsafeElements() []float64 {
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if c.elements == nil {
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c.elements = colorMIdentityElements
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@ -34,6 +34,10 @@ type GeoM struct {
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inited bool
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}
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func (g *GeoM) Reset() {
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g.inited = false
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}
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func (g *GeoM) Elements() (a, b, c, d, tx, ty float64) {
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if !g.inited {
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return 1, 0, 0, 1, 0, 0
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