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Add RotateMatrix and TranslateMatrix

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This commit is contained in:
Hajime Hoshi 2013-06-20 00:49:44 +09:00
parent 6ed9102f01
commit bc91c2210b
3 changed files with 36 additions and 3 deletions
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10
examples/glut/main.go
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@ -117,10 +117,13 @@ func (game *DemoGame) Update() {
func (game *DemoGame) Draw(g graphics.GraphicsContext, offscreen graphics.TextureID) {
g.Fill(&color.RGBA{R: 128, G: 128, B: 255, A: 255})
geometryMatrix := graphics.IdentityGeometryMatrix()
geometryMatrix.SetTx(float64(game.x))
geometryMatrix.SetTy(float64(game.x))
tx, ty := float64(game.ebitenTexture.Width), float64(game.ebitenTexture.Height)
geometryMatrix = geometryMatrix.Concat(graphics.TranslateMatrix(-tx/2, -ty/2))
geometryMatrix = geometryMatrix.Concat(graphics.RotateMatrix(float64(game.x) / 60))
geometryMatrix = geometryMatrix.Concat(graphics.TranslateMatrix(tx/2, ty/2))
geometryMatrix = geometryMatrix.Concat(graphics.TranslateMatrix(100, 100))
g.DrawTexture(game.ebitenTexture.ID,
0, 0, game.ebitenTexture.Width, game.ebitenTexture.Height,
0, 0, int(tx), int(ty),
geometryMatrix,
graphics.IdentityColorMatrix())
}
@ -133,4 +136,5 @@ func main() {
currentUI.Init()
ebiten.OpenGLRun(game, currentUI)
}

4
graphics/color_matrix.go
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@ -14,6 +14,10 @@ func IdentityColorMatrix() *ColorMatrix {
return &ColorMatrix{*IdentityAffineMatrix(colorMatrixDimension)}
}
func (matrix *ColorMatrix) Concat(other *ColorMatrix) *ColorMatrix {
return &ColorMatrix{*matrix.AffineMatrix.Concat(&other.AffineMatrix)}
}
func (matrix *ColorMatrix) Clone() *ColorMatrix {
return &ColorMatrix{*(matrix.AffineMatrix.Clone())}
}

25
graphics/geometry_matrix.go
View File

@ -1,5 +1,9 @@
package graphics
import (
"math"
)
type GeometryMatrix struct {
AffineMatrix
}
@ -14,6 +18,27 @@ func IdentityGeometryMatrix() *GeometryMatrix {
return &GeometryMatrix{*IdentityAffineMatrix(geometryMatrixDimension)}
}
func TranslateMatrix(tx, ty float64) *GeometryMatrix {
matrix := IdentityGeometryMatrix()
matrix.SetTx(tx)
matrix.SetTy(ty)
return matrix
}
func RotateMatrix(theta float64) *GeometryMatrix {
matrix := NewGeometryMatrix()
cos, sin := math.Cos(theta), math.Sin(theta)
matrix.SetA(cos)
matrix.SetB(-sin)
matrix.SetC(sin)
matrix.SetD(cos)
return matrix
}
func (matrix *GeometryMatrix) Concat(other *GeometryMatrix) *GeometryMatrix {
return &GeometryMatrix{*matrix.AffineMatrix.Concat(&other.AffineMatrix)}
}
func (matrix *GeometryMatrix) Clone() *GeometryMatrix {
return &GeometryMatrix{*(matrix.AffineMatrix.Clone())}
}