Implemented the example for testing the engine.

src/cmd/test/main.go

@@ -3,14 +3,19 @@ package main
 import (
 	"github.com/surdeus/gox/src/gx"
 	"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
+	"github.com/hajimehoshi/ebiten/v2"
 	"bytes"
 	"log"
+	"strings"
 )
 
 type Player struct {
 	*gx.Sprite
+	MoveSpeed gx.Float
 }
 
+type Debug struct{}
+
 var (
 	playerImg *gx.Image
 )
@@ -27,23 +32,57 @@ func NewPlayer() *Player {
 			},
 			Image: playerImg,
 		},
+		MoveSpeed: 90.,
 	}
 }
 
-func (p *Player) Update(e *gx.Engine) {
-	//p.Sprite.Object.T.P.Y += 40 * e.DT()
+func (p *Player) Update(e *gx.Engine) error {
 	dt := e.DT()
 	c := e.Camera()
-	//c.Object.T.P.X += 40 * dt
-	//c.Object.T.S.X += .01 * dt
-	c.Object.T.R += .2 * dt
+	keys := e.Keys()
+
+	for _, v := range keys {switch v {
+	case ebiten.KeyArrowUp :
+		c.Object.T.P.Y += p.MoveSpeed * dt
+	case ebiten.KeyArrowLeft :
+		c.Object.T.P.X -= p.MoveSpeed * dt
+	case ebiten.KeyArrowDown :
+		c.Object.T.P.Y -= p.MoveSpeed * dt
+	case ebiten.KeyArrowRight :
+		c.Object.T.P.X += p.MoveSpeed * dt
+	case ebiten.KeyW :
+		p.Object.T.P.Y += p.MoveSpeed * dt
+	case ebiten.KeyA :
+		p.Object.T.P.X -= p.MoveSpeed * dt
+	case ebiten.KeyS :
+		p.Object.T.P.Y -= p.MoveSpeed * dt
+	case ebiten.KeyD :
+		p.Object.T.P.X += p.MoveSpeed * dt
+	case ebiten.KeyR :
+		c.Object.T.R += gx.Pi * .3 * dt
+	case ebiten.KeyT :
+		c.Object.T.R -= gx.Pi * .3 * dt
+	}}
+
+	return nil
+}
+
+func (d *Debug) Draw(
+	e *gx.Engine,
+	i *gx.Image,
+) {
+	keyStrs := []string{}
+	for _, k := range e.Keys() {
+		keyStrs = append(keyStrs, k.String())
+	}
+	e.DebugPrint(i, strings.Join(keyStrs, ", "))
 }
 
 func main() {
 	e := gx.New(&gx.WindowConfig{
 		Title: "Test title",
-		Width: 480,
-		Height: 320,
+		Width: 720,
+		Height: 480,
 	})
 
 	var err error
@@ -54,5 +93,6 @@ func main() {
 
 
 	e.Add(0, NewPlayer())
+	e.Add(1, &Debug{})
 	e.Run()
 }

src/gix/main.go

@@ -1,5 +1,6 @@
 package gix
 
 import (
-	"github.com/hajimehoshi/ebiten/v2/inpututil"
 )
+
+

src/gx/camera.go

@@ -1,11 +1,19 @@
 package gx
 
+import (
+	"math"
+)
+
 // Implements the camera component
 // for the main window.
 type Camera struct {
 	*Object
 }
 
+const (
+	Pi = math.Pi
+)
+
 // Returns the matrix satysfying camera
 // position, scale and rotation to apply
 // it to the objects to get the real
@@ -13,16 +21,17 @@ type Camera struct {
 func (c *Camera)Matrix(scale bool) Matrix {
 	g := &Matrix{}
 
+	// For rotating around.
 	g.Translate(
 		-c.Object.T.RA.X,
-		-c.Object.T.RA.Y,
+		c.Object.T.RA.Y,
 	)
 
 	g.Rotate(c.Object.T.R)
 
 	g.Translate(
 		-c.Object.T.P.X,
-		-c.Object.T.P.Y,
+		c.Object.T.P.Y,
 	)
 
 	if scale {

src/gx/debug.go

@@ -0,0 +1,12 @@
+package gx
+
+import (
+	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
+)
+
+func (e *Engine)DebugPrint(
+	i *Image,
+	str string,
+) {
+	ebitenutil.DebugPrint(i, str)
+}

src/gx/main.go

@@ -14,7 +14,7 @@ type Layer int
 type WindowConfig struct {
 	Title string
 	Width, Height int
-	FullScreen bool
+	FixedSize bool
 }
 
 type Engine struct {
@@ -90,6 +90,7 @@ func (e *Engine) AddBehaver(b Behaver) {
 }
 
 func (e *engine) Update() error {
+	var err error
 	eng := (*Engine)(e)
 
 	e.keys = inpututil.
@@ -97,15 +98,16 @@ func (e *engine) Update() error {
 
 	e.dt = time.Since(e.lastTime).Seconds()
 	for _, v := range eng.behavers {
-		v.Update(eng)
-		//fmt.Println(v)
+		err = v.Update(eng)
+		if err != nil {
+			return err
+		}
 	}
 	e.lastTime = time.Now()
 
 	return nil
 }
 
-
 func (e *engine) Draw(i *ebiten.Image) {
 	eng := (*Engine)(e)
 	for p := range e.layers.Vals() {
@@ -116,8 +118,11 @@ func (e *engine) Draw(i *ebiten.Image) {
 }
 
 func (e *engine) Layout(ow, oh int) (int, int) {
+	if e.wcfg.FixedSize {
 		return e.wcfg.Width, e.wcfg.Height
 	}
+	return ow, oh
+}
 
 // Return the delta time duration value.
 func (e *Engine) DT() Float {

src/gx/object.go

@@ -2,7 +2,7 @@ package gx
 
 type Behaver interface {
 	Start(*Engine)
-	Update(*Engine)
+	Update(*Engine) error
 }
 
 // The object type represents
@@ -13,7 +13,9 @@ type Object struct {
 }
 
 func (o *Object) Start(e *Engine) {}
-func (o *Object) Update(e *Engine) {}
+func (o *Object) Update(e *Engine) error {
+	return nil
+}
 func (o *Object) GetObject() *Object {
 	return o
 }

src/gx/transform.go

@@ -31,7 +31,7 @@ func (t Transform)Matrix() Matrix {
 	g.Scale(t.S.X, t.S.Y)
 	g.Translate(-t.RA.X, -t.RA.Y)
 	g.Rotate(t.R)
-	g.Translate(t.P.X, t.P.Y)
+	g.Translate(t.P.X, -t.P.Y)
 
 	return *g
 }