Implemented drawing triangles.

src/cmd/test/main.go

@@ -23,6 +23,27 @@ type Rect struct {
 	*gx.DrawableRectangle
 }
 
+type Tri struct {
+	*gx.DrawableTriangles
+}
+
+func NewTri() *Tri {
+	ret := &Tri{}
+	ret.DrawableTriangles = &gx.DrawableTriangles{}
+	
+	ret.Triangles = gx.Triangles{
+		gx.Triangle{
+			gx.V(0, 0),
+			gx.V(100, 100),
+			gx.V(0, -50),
+		},
+	}
+	ret.Color = gx.Color{gx.MaxColorV, gx.MaxColorV, 0, gx.MaxColorV}
+	ret.Visible = true
+	
+	return ret
+}
+
 func NewRect() *Rect {
 	return &Rect{&gx.DrawableRectangle{
 			Rectangle: gx.Rectangle{
@@ -215,10 +236,12 @@ func main() {
 
 	player = NewPlayer()
 	rect = NewRect()
+	tri := NewTri()
 	
 	e.Add(1, &Debug{})
 	e.Add(0, player)
 	e.Add(-1, rect)
+	e.Add(100, tri)
 	
 	e.Run()
 }

src/gx/img.go

@@ -8,13 +8,22 @@ import (
 	"math"
 )
 
-type ColorV uint32
 type Image = ebiten.Image
+
+type ColorV uint32
 type ColorM = ebiten.ColorM
 type Color struct {
 	R, G, B, A ColorV
 }
 
+type Colority struct {
+	Color Color
+}
+
+type Visibility struct {
+	Visible bool
+}
+
 // The interface describes anything that can be
 // drawn. It will be drew corresponding to
 // the layers order.
@@ -30,6 +39,10 @@ const (
 	MaxColorV = math.MaxUint32
 )
 
+func (v Visibility) IsVisible() bool {
+	return v.Visible
+}
+
 func LoadImage(input io.Reader) (*Image, error) {
 	img, _, err := image.Decode(input)
 	if err != nil {

src/gx/polygon.go

@@ -1,83 +1,29 @@
 package gx
 
-// The type represents polygons.
-// Fuck. The package gets too big.
-// Should split it somehow.
-type Polygon []Point
+type PolygonTriangle struct {
+	P, S int
+}
 
-// Returns slice of edges.
-func (p Polygon) Edges() Edges {
-	ret := Edges{}
-	
-	l := p.Len()
-	for i := range p {
-		ret = append(ret, Edge{p[i], p[(i+1)%l]})
+type Polygon struct {
+	Transform
+	base Triangle
+	triangles []PolygonTriangle
+}
+
+type DrawablePolygon struct {
+	Polygon
+	ShaderOptions
+}
+
+func NewPolygon(base Triangle) *Polygon {
+	ret := &Polygon{
+		Transform: T(),
+		base: base,
 	}
-	
 	return ret
 }
 
-func (p Polygon) Len() int {
-	return len(p)
-}
-
-func (p Polygon) Vertices() []Vertex {
-	return p
-}
-
-func (p Polygon) Barycenter() Point {
-	ret := Point{}
-	for _, v := range p {
-		ret.X += v.X
-		ret.Y += v.Y
-	}
-	
-	l := Float(len(p))
-	ret.X /= l
-	ret.Y /= l
-	
-	return ret
-}
-
-/*
-func (p Polygon) anyPointInside() Point {
-	edges := p.Edges()
-	for _, e := range edges {
-		if
-	}
-}
-*/
-
-func (p Polygon) Triangles() Triangles {
-	/*
-	if len(p) < 3 {
-		return Triangles{}
-	} else 	
-	vertices = p.Vertices()
-	ret := Triangles{}
-	
-	i := 0
-	for len(vertices) != 3{
-
-		i1 = i % len(vertices)
-		i2 = (i+1) % len(vertices)
-		i3 = (i+2) % len(vertices)
-		
-		l1 = LineSegment{vertices[i1], vertices[i2]}.Line()
-		l2 = LineSegment{vertices[i1], vertices[i3]}.Line()
-		
-		if l1.K > 0 {
-			if l1.K 
-		} else {
-		}
-	}
-	
-	return append(
-		ret,
-		Triangle{p[0], p[1], p[2]},
-	)
-	*/
-	
+func (p *Polygon) Triangles() Triangles {
 	return Triangles{}
 }
 

src/gx/triangle.go

@@ -2,14 +2,37 @@ package gx
 
 import (
 	"math"
+	"github.com/hajimehoshi/ebiten/v2"
 )
 
-// The structure of a triangle. What more you want to hear?
-type Triangle [3]Point
+// Ebitens vector in better abstractions like Vectors.
+type Vertex struct {
+	Dst Vector
+	Src Vector
+	Colority
+}
+
+type Triangle [3]Vector
 type Triangles []Triangle
-type DrawableTriangle struct {
-	Triangle
+type DrawableTriangles struct {
+	Triangles
+	Visibility
+	Colority
 	ShaderOptions
+	ebiten.DrawTrianglesOptions
+}
+
+func (v Vertex) Ebiten() ebiten.Vertex {
+	return ebiten.Vertex {
+		DstX: float32(v.Dst.X),
+		DstY: float32(v.Dst.Y),
+		SrcX: float32(v.Src.X),
+		SrcY: float32(v.Src.Y),
+		ColorR: float32(v.Color.R)/(float32(MaxColorV)),
+		ColorG: float32(v.Color.G)/(float32(MaxColorV)),
+		ColorB: float32(v.Color.B)/(float32(MaxColorV)),
+		ColorA: float32(v.Color.A)/(float32(MaxColorV)),
+	}
 }
 
 // Returns the area of the triangle.
@@ -65,52 +88,44 @@ func (ts Triangles) ContainsPoint(p Point) bool {
 	return false
 }
 
-//func (t Triangle)
-/*
-func (r *DrawableRectangle) Draw(
+func (r *DrawableTriangles) Draw(
 	e *Engine,
 	i *Image,
 ) {
-	t := r.T
+	m := e.Camera().RealMatrix(e)
+	cm := &m
 	
 	// Draw solid color if no shader.
 	if r.Shader == nil {
-		t.S.X *= r.W
-		t.S.Y *= r.H
-		
-		m := t.Matrix(e)
-		rm := e.Camera().RealMatrix(e, true)
-		
-		m.Concat(rm)
-		
-		opts := &ebiten.DrawImageOptions{
-			GeoM: m,
+		vs := make([]ebiten.Vertex, len(r.Triangles) * 3)
+		var buf Vertex
+		buf.Color = r.Color
+		for i := range r.Triangles {
+			for j := range r.Triangles[i] {
+				buf.Dst = r.Triangles[i][j].Apply(cm)
+				vs[i*3 + j] = buf.Ebiten()
+			}
 		}
-		i.DrawTriangles(img, opts)
+		
+		is := make([]uint16, len(r.Triangles) * 3)
+		for i := 0 ; i < len(is) ; i++ {
+			is[i] = uint16(i)
+		}
+		
+		img := NewImage(1, 1)
+		img.Set(0, 0, r.Color)
+		
+		i.DrawTriangles(vs, is, img, &r.DrawTrianglesOptions)
 		return
 	}
 	
 	// Use the Color as base image if no is provided.
-	var did bool
-	if r.Images[0] == nil {
+	/*if r.Images[0] == nil {
 		r.Images[0] = NewImage(1, 1)
 		r.Images[0].Set(0, 0, r.Color)
-		did = true
 	} 
 	
 	w, h := r.Images[0].Size()
-	if !did {
-		t.S.X /= Float(w)
-		t.S.Y /= Float(h)
-		
-		t.S.X *= r.W
-		t.S.Y *= r.H
-	}
-	
-	
-	rm := e.Camera().RealMatrix(e, true)
-	m := t.Matrix(e)
-	m.Concat(rm)
 	
 	// Drawing with shader.
 	opts := &ebiten.DrawRectShaderOptions{
@@ -118,7 +133,6 @@ func (r *DrawableRectangle) Draw(
 		Images: r.Images,
 		Uniforms: r.Uniforms,
 	}
-	i.DrawRectShader(w, h, r.Shader, opts)
+	i.DrawRectShader(w, h, r.Shader, opts)*/
 }
-*/
 

src/gx/vector.go

@@ -9,7 +9,7 @@ type Vector struct {
 	X, Y Float
 }
 type Point = Vector
-type Vertex = Vector
+//type Vertex = Vector
 
 type Vectors []Vector
 type Points []Point