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Refactoring: matrix initialization
This commit is contained in:
Hajime Hoshi
parent
c53695eb56
commit
ea98fefc4f
28
colorm.go
28
colorm.go
@ -21,16 +21,6 @@ import (
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// ColorMDim is a dimension of a ColorM.
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const ColorMDim = 5
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var colorMI = ColorM{
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initialized: true,
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es: [ColorMDim - 1][ColorMDim]float64{
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{1, 0, 0, 0, 0},
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{0, 1, 0, 0, 0},
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{0, 0, 1, 0, 0},
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{0, 0, 0, 1, 0},
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},
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}
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// A ColorM represents a matrix to transform coloring when rendering an image.
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//
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// A ColorM is applied to the source alpha color
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@ -48,6 +38,14 @@ func (c *ColorM) dim() int {
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return ColorMDim
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}
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func (c *ColorM) initialize() {
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c.initialized = true
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c.es[0][0] = 1
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c.es[1][1] = 1
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c.es[2][2] = 1
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c.es[3][3] = 1
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}
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// Element returns a value of a matrix at (i, j).
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func (c *ColorM) Element(i, j int) float64 {
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if !c.initialized {
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@ -62,7 +60,7 @@ func (c *ColorM) Element(i, j int) float64 {
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// Concat multiplies a color matrix with the other color matrix.
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func (c *ColorM) Concat(other ColorM) {
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if !c.initialized {
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*c = colorMI
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c.initialize()
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}
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result := ColorM{}
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mul(&other, c, &result)
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@ -72,7 +70,7 @@ func (c *ColorM) Concat(other ColorM) {
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// Add adds a color matrix with the other color matrix.
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func (c *ColorM) Add(other ColorM) {
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if !c.initialized {
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*c = colorMI
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c.initialize()
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}
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result := ColorM{}
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add(&other, c, &result)
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@ -81,7 +79,7 @@ func (c *ColorM) Add(other ColorM) {
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func (c *ColorM) Scale(r, g, b, a float64) {
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if !c.initialized {
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*c = colorMI
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c.initialize()
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}
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for i := 0; i < ColorMDim; i++ {
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c.es[0][i] *= r
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@ -93,7 +91,7 @@ func (c *ColorM) Scale(r, g, b, a float64) {
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func (c *ColorM) Translate(r, g, b, a float64) {
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if !c.initialized {
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*c = colorMI
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c.initialize()
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}
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c.es[0][4] += r
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c.es[1][4] += g
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@ -104,7 +102,7 @@ func (c *ColorM) Translate(r, g, b, a float64) {
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// SetElement sets an element at (i, j).
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func (c *ColorM) SetElement(i, j int, element float64) {
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if !c.initialized {
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*c = colorMI
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c.initialize()
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}
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c.es[i][j] = element
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}
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@ -109,22 +109,24 @@ func (s *GameScene) drawBackground(r *ebiten.Image) error {
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}
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w, h := imageGameBG.Size()
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geo := ebiten.TranslateGeo(-float64(w)/2, -float64(h)/2)
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var geo ebiten.GeoM
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geo.Translate(-float64(w)/2, -float64(h)/2)
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scaleW := ScreenWidth / float64(w)
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scaleH := ScreenHeight / float64(h)
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scale := scaleW
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if scale < scaleH {
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scale = scaleH
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}
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geo.Concat(ebiten.ScaleGeo(scale, scale))
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geo.Concat(ebiten.TranslateGeo(ScreenWidth/2, ScreenHeight/2))
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geo.Scale(scale, scale)
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geo.Translate(ScreenWidth/2, ScreenHeight/2)
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a := 0.7
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m := ebiten.Monochrome()
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m.Concat(ebiten.ScaleColor(a, a, a, a))
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clr := ebiten.ScaleColor(1-a, 1-a, 1-a, 1-a)
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m.Scale(a, a, a, a)
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var clr ebiten.ColorM
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clr.Scale(1-a, 1-a, 1-a, 1-a)
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clr.Add(m)
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clr.Concat(ebiten.TranslateColor(0.3, 0.3, 0.3, 0))
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clr.Translate(0.3, 0.3, 0.3, 0)
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return r.DrawImage(imageGameBG, &ebiten.DrawImageOptions{
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GeoM: geo,
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ColorM: clr,
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24
geom.go
24
geom.go
@ -21,14 +21,6 @@ import (
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// GeoMDim is a dimension of a GeoM.
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const GeoMDim = 3
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var geoMI = GeoM{
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initialized: true,
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es: [2][3]float64{
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{1, 0, 0},
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{0, 1, 0},
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},
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}
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// A GeoM represents a matrix to transform geometry when rendering an image.
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//
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// The initial value is identity.
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@ -41,6 +33,12 @@ func (g *GeoM) dim() int {
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return GeoMDim
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}
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func (g *GeoM) initialize() {
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g.initialized = true
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g.es[0][0] = 1
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g.es[1][1] = 1
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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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if !g.initialized {
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@ -55,7 +53,7 @@ func (g *GeoM) Element(i, j int) float64 {
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// Concat multiplies a geometry matrix with the other geometry matrix.
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func (g *GeoM) Concat(other GeoM) {
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if !g.initialized {
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*g = geoMI
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g.initialize()
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}
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result := GeoM{}
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mul(&other, g, &result)
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@ -65,7 +63,7 @@ func (g *GeoM) Concat(other GeoM) {
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// Add adds a geometry matrix with the other geometry matrix.
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func (g *GeoM) Add(other GeoM) {
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if !g.initialized {
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*g = geoMI
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g.initialize()
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}
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result := GeoM{}
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add(&other, g, &result)
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@ -74,7 +72,7 @@ func (g *GeoM) Add(other GeoM) {
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func (g *GeoM) Scale(x, y float64) {
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if !g.initialized {
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*g = geoMI
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g.initialize()
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}
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for i := 0; i < GeoMDim; i++ {
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g.es[0][i] *= x
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@ -84,7 +82,7 @@ func (g *GeoM) Scale(x, y float64) {
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func (g *GeoM) Translate(tx, ty float64) {
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if !g.initialized {
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*g = geoMI
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g.initialize()
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}
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g.es[0][2] += tx
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g.es[1][2] += ty
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@ -93,7 +91,7 @@ func (g *GeoM) Translate(tx, ty float64) {
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// SetElement sets an element at (i, j).
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func (g *GeoM) SetElement(i, j int, element float64) {
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if !g.initialized {
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*g = geoMI
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g.initialize()
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}
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g.es[i][j] = element
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}
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