feat: use values not pointers for matrices.

engine.go

@@ -206,9 +206,7 @@ func (e *Engine) CursorPosition() Vector {
 }
 
 func (e *Engine) AbsCursorPosition() Vector {
-	m := &Matrix{}
-	m.Concat(e.Camera.AbsMatrix())
-	return e.CursorPosition().Apply(m)
+	return e.CursorPosition().Apply(e.Camera.AbsMatrix())
 }
 
 func (e *engine) Update() error {
@@ -278,8 +276,8 @@ func (e *engine) Update() error {
 	if !realPos.Eq(eng.cursorPos) {
 		absM := eng.Camera.AbsMatrix()
 
-		absPrevPos :=eng.cursorPos.Apply(&absM)
-		absPos := realPos.Apply(&absM)
+		absPrevPos :=eng.cursorPos.Apply(absM)
+		absPos := realPos.Apply(absM)
 
 		events = append(events, &MouseMove{
 			Real: realPos.Sub(eng.cursorPos),

polygon.go

@@ -9,7 +9,7 @@ type Polygon struct {
 	Triangles
 }
 
-func (p *Polygon) ContainsPoint(pnt Point) bool {
+func (p Polygon) ContainsPoint(pnt Point) bool {
 	return p.MakeTriangles().ContainsPoint(pnt)
 }
 
@@ -22,7 +22,7 @@ type DrawablePolygon struct {
 	Colority
 }
 
-func (p *Polygon) MakeTriangles() Triangles {
+func (p Polygon) MakeTriangles() Triangles {
 	m := p.Matrix()
 	ret := make(Triangles, len(p.Triangles))
 	for i, t := range p.Triangles {

rect.go

@@ -79,11 +79,9 @@ func (r *DrawableRectangle) Draw(c *Context) {
 		img := NewImage(1, 1)
 		img.Set(0, 0, r.Color)
 		
-		
-		opts := &ebiten.DrawImageOptions{
-			GeoM: *m,
-		}
-		c.DrawImage(img, opts)
+		c.DrawImage(img, &ebiten.DrawImageOptions{
+			GeoM: m,
+		})
 		return
 	}
 	
@@ -98,11 +96,10 @@ func (r *DrawableRectangle) Draw(c *Context) {
 	w, h := r.Images[0].Size()
 	
 	// Drawing with shader.
-	opts := &ebiten.DrawRectShaderOptions{
-		GeoM: *m,
+	c.DrawRectShader(w, h, r.Shader, &ebiten.DrawRectShaderOptions{
+		GeoM: m,
 		Images: r.Images,
 		Uniforms: r.Uniforms,
-	}
-	c.DrawRectShader(w, h, r.Shader, opts)
+	})
 }
 

sprite.go

@@ -19,29 +19,26 @@ func (s *Sprite) Draw(c *Context) {
 	}
 	
 	t := s.Rectangle().Transform
-	m := &Matrix{}
-	tm := t.Matrix()
-	m.Concat(*tm)
+	m := t.Matrix()
 	if !s.Floating {
 		m.Concat(c.Camera.RealMatrix())
 	}
 
 	// Drawing without shader.
 	if s.Shader == nil {
-		opts := &ebiten.DrawImageOptions{}
-		opts.GeoM = *m
-		c.DrawImage(s.Images[0], opts)
+		c.DrawImage(s.Images[0], &ebiten.DrawImageOptions{
+			GeoM: m,
+		})
 		return
 	}
 	
 	w, h := s.Images[0].Size()
 	// Drawing with shader.
-	opts := &ebiten.DrawRectShaderOptions{
+	c.DrawRectShader(w, h, s.Shader, &ebiten.DrawRectShaderOptions{
 		Images: s.Images,
 		Uniforms: s.Uniforms,
-		GeoM: *m,
-	}
-	c.DrawRectShader(w, h, s.Shader, opts)
+		GeoM: m,
+	})
 }
 
 // Return the rectangle that contains the sprite.

transform.go

@@ -6,7 +6,7 @@ import (
 )
 
 type Transformer interface {
-	GetTransform() *Transform
+	GetTransform() Transform
 }
 
 // The structure represents basic transformation
@@ -25,7 +25,7 @@ type Transform struct {
 	Parent Transformer
 }
 
-func (t *Transform) GetTransform() *Transform {
+func (t Transform) GetTransform() Transform {
 	return t
 }
 
@@ -40,20 +40,6 @@ func T() Transform {
 	return ret
 }
 
-func (t Transform) ScaledToXY(x, y Float) Transform {
-	return t.ScaledToX(x).ScaledToY(y)
-}
-
-func (t Transform) ScaledToX(x Float) Transform {
-	t.Scale.X = x
-	return t
-}
-
-func (t Transform) ScaledToY(y Float) Transform {
-	t.Scale.Y = y
-	return t
-}
-
 func (t *Transform) SetAbsPosition(absPosition Vector) {
 	if t.Parent == nil {
 		t.Position = absPosition
@@ -65,9 +51,9 @@ func (t *Transform) SetAbsPosition(absPosition Vector) {
 }
 
 // Get the absolute representation of the transform.
-func (t *Transform) Abs() Transform {
+func (t Transform) Abs() Transform {
 	if t.Parent == nil {
-		return *t
+		return t
 	}
 
 	ret := T()
@@ -78,21 +64,21 @@ func (t *Transform) Abs() Transform {
 	return ret
 }
 
-func (t *Transform) AbsPosition() Vector {
+func (t Transform) AbsPosition() Vector {
 	if t.Parent == nil {
 		return t.Position
 	}
 	return t.Position.Apply(t.ParentMatrix())
 }
 
-func (t *Transform) AbsScale() Vector {
+func (t Transform) AbsScale() Vector {
 	if t.Parent == nil {
 		return t.Scale
 	}
 	return V2(1)
 }
 
-func (t *Transform) AbsRotation() Float {
+func (t Transform) AbsRotation() Float {
 	if t.Parent == nil {
 		return t.Rotation
 	}
@@ -125,8 +111,8 @@ func (t *Transform) Disconnect() {
 	*t = t.Abs()
 }
 
-func (t *Transform) ParentMatrix() *Matrix {
-	g := &Matrix{}
+func (t Transform) ParentMatrix() Matrix {
+	g := Matrix{}
 	if t.Parent == nil {
 		return g
 	}
@@ -143,8 +129,8 @@ func (t *Transform) ParentMatrix() *Matrix {
 
 // Returns the GeoM with corresponding
 // to the transfrom transformation.
-func (t *Transform)Matrix() *Matrix {
-	g := &Matrix{}
+func (t Transform)Matrix() Matrix {
+	g := Matrix{}
 
 	// Scale first.
 	g.Scale(t.Scale.X, t.Scale.Y)
@@ -160,7 +146,7 @@ func (t *Transform)Matrix() *Matrix {
 	g.Translate(t.Position.X, t.Position.Y)
 
 	m := t.ParentMatrix()
-	g.Concat(*m)
+	g.Concat(m)
 
 	return g
 }

triangle.go

@@ -90,7 +90,6 @@ func (ts Triangles) ContainsPoint(p Point) bool {
 
 func (r *DrawableTriangles) Draw(c *Context) {
 	m := c.Camera.RealMatrix()
-	cm := &m
 	
 	// Draw solid color if no shader.
 	if r.Shader == nil {
@@ -99,7 +98,7 @@ func (r *DrawableTriangles) Draw(c *Context) {
 		buf.Color = r.Color
 		for i := range r.Triangles {
 			for j := range r.Triangles[i] {
-				buf.Dst = r.Triangles[i][j].Apply(cm)
+				buf.Dst = r.Triangles[i][j].Apply(m)
 				vs[i*3 + j] = buf.Ebiten()
 			}
 		}

vector.go

@@ -45,9 +45,9 @@ func (v Vector) Eq(o Vector) bool {
 }
 
 // Returns the vector with the matrix applied
-func (v Vector) Apply(m *Matrix) Vector {
+func (v Vector) Apply(m Matrix) Vector {
 	x, y := m.Apply(v.X, v.Y)
-	return V(x, y)
+	return Vector{x, y}
 }
 
 // Adds the vector to other one returning the result.
@@ -80,7 +80,7 @@ func (v Vector) Neg() Vector {
 
 // Returns the vector rotated by "a" angle in radians.
 func (v Vector) Rotate(a Float) Vector {
-	m := &Matrix{}
+	m := Matrix{}
 	m.Rotate(a)
 	return v.Apply(m)
 }