Started implementing colliders. Simplified structure for basic types like Camera.

src/cmd/test/main.go

@@ -24,13 +24,11 @@ var (
 func NewPlayer() *Player {
 	return &Player{
 		Sprite: &gx.Sprite{
-			Object: &gx.Object{
-				T: gx.Transform {
-					S: gx.Vector{5, 5},
-					RA: gx.Vector{320, 240},
-				},
+			T: gx.Transform {
+				S: gx.Vector{5, 5},
+				RA: gx.Vector{320, 240},
 			},
-			Image: playerImg,
+			I: playerImg,
 		},
 		MoveSpeed: 90.,
 		ScaleSpeed: .2,
@@ -39,7 +37,7 @@ func NewPlayer() *Player {
 
 func (p *Player) Start(e *gx.Engine) {
 	c := e.Camera()
-	c.Object.T.RA = gx.V(360, -240)
+	c.T.RA = gx.V(360, -240)
 }
 
 func (p *Player) Update(e *gx.Engine) error {
@@ -49,51 +47,51 @@ func (p *Player) Update(e *gx.Engine) error {
 
 	for _, v := range keys {switch v {
 	case ebiten.KeyArrowUp :
-		c.Object.T.P.Y += p.MoveSpeed * dt
+		c.T.P.Y += p.MoveSpeed * dt
 	case ebiten.KeyArrowLeft :
-		c.Object.T.P.X -= p.MoveSpeed * dt
+		c.T.P.X -= p.MoveSpeed * dt
 	case ebiten.KeyArrowDown :
-		c.Object.T.P.Y -= p.MoveSpeed * dt
+		c.T.P.Y -= p.MoveSpeed * dt
 	case ebiten.KeyArrowRight :
-		c.Object.T.P.X += p.MoveSpeed * dt
+		c.T.P.X += p.MoveSpeed * dt
 	case ebiten.KeyW :
-		p.Object.T.P.Y += p.MoveSpeed * dt
+		p.T.P.Y += p.MoveSpeed * dt
 	case ebiten.KeyA :
-		p.Object.T.P.X -= p.MoveSpeed * dt
+		p.T.P.X -= p.MoveSpeed * dt
 	case ebiten.KeyS :
-		p.Object.T.P.Y -= p.MoveSpeed * dt
+		p.T.P.Y -= p.MoveSpeed * dt
 	case ebiten.KeyD :
-		p.Object.T.P.X += p.MoveSpeed * dt
+		p.T.P.X += p.MoveSpeed * dt
 	case ebiten.KeyR :
-		c.Object.T.R += gx.Pi * p.ScaleSpeed * dt
+		c.T.R += gx.Pi * p.ScaleSpeed * dt
 	case ebiten.KeyT :
-		c.Object.T.R -= gx.Pi * p.ScaleSpeed * dt
+		c.T.R -= gx.Pi * p.ScaleSpeed * dt
 	case ebiten.KeyF :
 		if e.KeyIsPressed(ebiten.KeyShift) {
-			c.Object.T.S.X -= gx.Pi * p.ScaleSpeed * dt
+			c.T.S.X -= gx.Pi * p.ScaleSpeed * dt
 		} else {
-			c.Object.T.S.X += gx.Pi * p.ScaleSpeed * dt
+			c.T.S.X += gx.Pi * p.ScaleSpeed * dt
 		}
 	case ebiten.KeyG :
 		if e.KeyIsPressed(ebiten.KeyShift) {
-			c.Object.T.S.Y -= gx.Pi * p.ScaleSpeed * dt
+			c.T.S.Y -= gx.Pi * p.ScaleSpeed * dt
 		} else {
-			c.Object.T.S.Y += gx.Pi * p.ScaleSpeed * dt
+			c.T.S.Y += gx.Pi * p.ScaleSpeed * dt
 		}
 	case ebiten.KeyZ :
 		if e.KeyIsPressed(ebiten.KeyShift) {
-			c.Object.T.RA.X -= gx.Pi * p.MoveSpeed * dt
+			c.T.RA.X -= gx.Pi * p.MoveSpeed * dt
 		} else {
-			c.Object.T.RA.X += gx.Pi * p.MoveSpeed * dt
+			c.T.RA.X += gx.Pi * p.MoveSpeed * dt
 		}
-		log.Println(c.Object.T.RA.X)
+		log.Println(c.T.RA.X)
 	case ebiten.KeyX :
 		if e.KeyIsPressed(ebiten.KeyShift) {
-			c.Object.T.RA.Y -= gx.Pi * p.MoveSpeed * dt
+			c.T.RA.Y -= gx.Pi * p.MoveSpeed * dt
 		} else {
-			c.Object.T.RA.Y += gx.Pi * p.MoveSpeed * dt
+			c.T.RA.Y += gx.Pi * p.MoveSpeed * dt
 		}
-		log.Println(c.Object.T.RA.Y)
+		log.Println(c.T.RA.Y)
 	case ebiten.Key0 :
 		e.Del(p)
 	}}
@@ -117,6 +115,7 @@ func main() {
 		Title: "Test title",
 		Width: 720,
 		Height: 480,
+		VSync: true,
 	})
 
 	var err error

src/gx/camera.go

@@ -7,7 +7,7 @@ import (
 // Implements the camera component
 // for the main window.
 type Camera struct {
-	*Object
+	T Transform
 }
 
 const (
@@ -18,6 +18,8 @@ const (
 // position, scale and rotation to apply
 // it to the objects to get the real
 // transform to display on the screen.
+// (Should implement buffering it so we do not
+//  need to calculate it each time for each object. )
 func (c *Camera)RealMatrix(
 	e *Engine,
 	scale bool,
@@ -27,20 +29,20 @@ func (c *Camera)RealMatrix(
 
 	if scale {
 		g.Scale(
-			c.Object.T.S.X,
-			c.Object.T.S.Y,
+			c.T.S.X,
+			c.T.S.Y,
 		)
 	}
 
 	g.Translate(
-		-c.Object.T.P.X,
-		c.Object.T.P.Y,
+		-c.T.P.X,
+		c.T.P.Y,
 	)
-	g.Rotate(-c.Object.T.R)
+	g.Rotate(-c.T.R)
 
 	g.Translate(
-		c.Object.T.RA.X,
-		-c.Object.T.RA.Y,
+		c.T.RA.X,
+		-c.T.RA.Y,
 	)
 
 	return *g

src/gx/circle.go

@@ -0,0 +1,16 @@
+package gx
+
+type Circle struct {
+	// Position
+	P Point
+	// Radius
+	R Float
+}
+
+func (c Circle) ColliderSimplify() Rect {
+	return Rect{
+		W: c.R * 2,
+		H: c.R * 2,
+	}
+}
+

src/gx/collider-simplifier.go

@@ -0,0 +1,12 @@
+package gx
+
+// Implementing the interface lets 
+// the engine to work faster about
+// collisions because it first checks
+// if the the bigger rectangles that
+// contain more complicated structure
+// do collide.
+type ColliderSimplifier interface {
+	ColliderSimplify() Rect
+}
+

src/gx/main.go

@@ -17,6 +17,7 @@ type WindowConfig struct {
 	Title string
 	Width, Height int
 	FixedSize bool
+	VSync bool
 }
 
 // The main structure that represents current state of [game] engine.
@@ -58,10 +59,8 @@ func New(
 			*poolx.Pool[Drawer],
 		](true),
 		camera: &Camera{
-			Object: &Object{
-				T: Transform{
+			T: Transform{
 					S: Vector{1, 1},
-				},
 			},
 		},
 		behavers: poolx.New[Behaver](),
@@ -74,7 +73,6 @@ func (e *Engine) Add(l Layer, b any) {
 	beh, ok := b.(Behaver)
 	if ok {
 		e.AddBehaver(beh)
-		beh.Start(e)
 	}
 
 	drw, ok := b.(Drawer)
@@ -116,6 +114,7 @@ func (e *Engine) AddDrawer(l Layer, d Drawer) {
 
 func (e *Engine) AddBehaver(b Behaver) {
 	e.behavers.Append(b)
+	b.Start(e)
 }
 
 func (e *engine) Update() error {
@@ -163,9 +162,10 @@ func (e *Engine) Run() error {
 	ebiten.SetWindowTitle(e.wcfg.Title)
 	ebiten.SetWindowSize(e.wcfg.Width, e.wcfg.Height)
 	ebiten.SetWindowSizeLimits(1, 1, e.wcfg.Width, e.wcfg.Height)
+	
+	ebiten.SetVsyncEnabled(e.wcfg.VSync)
 
 	e.lastTime = time.Now()
-
 	return ebiten.RunGame((*engine)(e))
 }
 

src/gx/object.go

@@ -1,22 +1,23 @@
 package gx
 
-type Behaver interface {
+// Implementing the interface type
+// will call the function OnStart
+// when first appear on scene BEFORE
+// the OnUpdate.
+type Starter interface {
 	Start(*Engine)
+}
+
+// Implementing the interface type
+// will call the function on each
+// engine iteration.
+type Updater interface {
 	Update(*Engine) error
 }
 
-// The object type represents
-// basic information for interaction
-// with the engine.
-type Object struct {
-	T Transform
-}
-
-func (o *Object) Start(e *Engine) {}
-func (o *Object) Update(e *Engine) error {
-	return nil
-}
-func (o *Object) GetObject() *Object {
-	return o
+// The general interface for 
+type Behaver interface {
+	Starter
+	Updater
 }
 

src/gx/rect.go

@@ -0,0 +1,16 @@
+package gx
+
+// The type describes rectangle geometry.
+type Rect struct {
+	// Position and rotate around.
+	P, RA Point
+	// Width and height.
+	W, H Float
+	// Rotation in radians.
+	R Float
+}
+
+func (r Rect) ColliderSimplify() Rect {
+	return r
+}
+

src/gx/sprite.go

@@ -5,8 +5,8 @@ import (
 )
 
 type Sprite struct {
-	*Object
-	*Image
+	I *Image
+	T Transform
 	Floating bool
 }
 
@@ -17,7 +17,7 @@ func (s *Sprite) Draw(
 	op := &ebiten.DrawImageOptions{}
 	m := &Matrix{}
 
-	m.Concat(s.Object.T.Matrix(e))
+	m.Concat(s.T.Matrix(e))
 	if e.camera != nil {
 		m.Concat(e.camera.RealMatrix(
 			e,
@@ -26,6 +26,6 @@ func (s *Sprite) Draw(
 	}
 
 	op.GeoM = *m
-	i.DrawImage(s.Image, op)
+	i.DrawImage(s.I, op)
 }
 

src/gx/triangle.go

@@ -0,0 +1,6 @@
+package gx
+
+type Triangle struct {
+	Points [3]Point
+}
+