feat: implemented basic animation. (very raw)

animation.go

@@ -1,15 +1,67 @@
 package gg
 
 import (
-	"time"
+	"github.com/hajimehoshi/ebiten/v2"
+	"fmt"
 )
 
-type Animation struct {
-	Frames []*Image
+type Animation []*Image
+
+type AnimationDefine struct{
+	Id AnimationId
+	Indexes []ImageRectIndex
+}
+// Animation define
+func AD(id AnimationId, indexes ...ImageRectIndex) AnimationDefine {
+	return AnimationDefine{
+		Id: id,
+		Indexes: indexes,
+	}
+}
+func (ad AnimationDefine) DefRow(y int, xs ...int) AnimationDefine {
+	for _, x := range xs {
+		ad.Indexes = append(ad.Indexes, ImageRectIndex{x, y})
+	}
+	return ad
+}
+
+func (ad AnimationDefine) DefCol(x int, ys ...int) AnimationDefine {
+	for _, y := range ys {
+		ad.Indexes = append(ad.Indexes, ImageRectIndex{x, y})
+	}
+	return ad
 }
 
 type AnimationId int
-type AnimationSet map[AnimationId] *Animation
+type AnimationSet map[AnimationId] Animation
+func AnimationSetFromImage(
+	img *Image,
+	w, h int,
+	defines ...AnimationDefine,
+) (AnimationSet, error) {
+	set := AnimationSet{}
+
+	r := img.Bounds()
+	fw, fh := r.Dx()/w, r.Dy()/h
+
+	for _, define := range defines {
+		fmt.Println("def-idx-len:", len(define.Indexes))
+		animation := make(Animation, len(define.Indexes))
+		for i := range animation {
+			idx := define.Indexes[i]
+			animation[i] = ebiten.NewImageFromImage(img.SubImage(
+				ImageRect{
+					Min: ImagePoint{idx.X*fw, idx.Y*fh},
+					Max: ImagePoint{(idx.X+1)*fw, (idx.Y+1)*fh},
+				},
+			))
+		}
+		fmt.Println("animation-len:", len(animation))
+		set[define.Id] = animation
+	}
+
+	return set, nil
+}
 
 // The type implements animated sprites.
 type AnimatedSprite struct {
@@ -17,18 +69,31 @@ type AnimatedSprite struct {
 	Animations AnimationSet
 	AnimationId AnimationId
 	CurrentFrame int
-	TimeBetweenFrames time.Duration
+	// This is time between animation frames, not
+	// engine ones.
+	TimeBetweenFrames Duration
+	duration Duration
 }
 
 func (as *AnimatedSprite) Animate(id AnimationId) bool {
 	_, ok := as.Animations[id]
 	if ok {
+		as.duration = 0
 		as.AnimationId = id
 	}
 	return ok
 }
 
 func (as *AnimatedSprite) Draw(c *Context) []EVertex {
-	return nil
+	as.duration += c.DrawDt()
+	frames := as.Animations[as.AnimationId]
+	fmt.Println("len:", len(frames))
+	fullTime := Duration(len(frames)) * as.TimeBetweenFrames
+	if as.duration > fullTime {
+		as.duration -= fullTime
+	}
+	as.Images[0] = frames[(as.duration/as.TimeBetweenFrames)%Duration(len(frames))]
+
+	return as.Sprite.Draw(c)
 }
 

cmd/test/main.go

@@ -21,7 +21,13 @@ const (
 	LowestL
 )
 
+const (
+	Stand gg.AnimationId = iota
+	Walk
+)
+
 var (
+	playerAnimations gg.AnimationSet
 	playerImg *gg.Image
 	player    *Player
 	rectMove  gg.Rectangle
@@ -45,6 +51,12 @@ func main() {
 	}
 
 	rect = NewRect()
+
+	playerAnimations, _ = gg.AnimationSetFromImage(
+		playerImg,
+		8, 3,
+		gg.AD(Walk).DefRow(0, 0, 1, 2, 3, 4),
+	)
 	player = NewPlayer()
 	tri = NewTri()
 
@@ -82,6 +94,7 @@ func main() {
 	}
 	e.Spawn(txt)
 
+
 	//fmt.Println(rect.GetLayer(), player.GetLayer())
 	fmt.Println("Starting...")
 	err = e.Run()

cmd/test/player.go

@@ -3,12 +3,13 @@ package main
 import (
 	//"math/rand"
 	"fmt"
+	"time"
 )
 
 import "vultras.su/core/gg"
 
 type Player struct {
-	gg.Sprite
+	gg.AnimatedSprite
 	MoveSpeed  gg.Float
 	ScaleSpeed gg.Float
 	Spawned bool
@@ -17,17 +18,15 @@ type Player struct {
 func NewPlayer() *Player {
 	ret := &Player{}
 	ret.Transform = gg.T()
-	fmt.Println("transform:", ret.Transform)
-	//ret.Parent = rect
 	ret.Scale = gg.V2(1)
-	// Around center.
 	ret.Around = gg.V2(.5)
 	ret.MoveSpeed = 90.
 	ret.ScaleSpeed = .2
+	ret.Animations = playerAnimations
+	ret.TimeBetweenFrames = time.Second/5
+	fmt.Println("player-walk", ret.Animate(Walk))
 
 	ret.Visible = true
-
-	ret.Images[0] = playerImg
 	ret.Layer = PlayerL
 
 	return ret
@@ -40,7 +39,7 @@ func (p *Player) Update(c *Context) {
 	if p.Spawned {
 		return
 	}
-	dt := c.Dt()
+	dt := c.Dt().Seconds()
 	cam := c.Camera
 	keys := c.Keys()
 
@@ -124,7 +123,7 @@ func (p *Player) Update(c *Context) {
 		c.Camera.Position = pos.Sub(ec.Abs)
 	case *gg.WheelChange:
 		c.Camera.Scale = c.Camera.Scale.Add(gg.V2(
-			ec.Offset.Y * c.Dt() * p.ScaleSpeed * 40,
+			ec.Offset.Y * dt * p.ScaleSpeed * 40,
 		))
 	}}
 }

cmd/test/trianlge.go

@@ -32,7 +32,7 @@ func NewTri() *Tri {
 }
 
 func (t *Tri) Update(c *Context) {
-	dt := c.Dt()
+	dt := c.Dt().Seconds()
 	if t.ContainsPoint(c.AbsCursorPosition()) {
 		t.Color = gg.Rgba(0, 1, 0, 1)
 	} else {
@@ -53,12 +53,12 @@ func (t *Tri) Update(c *Context) {
 	case gg.KeyM:
 		absPos := t.AbsPosition()
 		t.SetAbsPosition(
-			absPos.Add(gg.V(0, 100*c.Dt()*d)),
+			absPos.Add(gg.V(0, 100*dt*d)),
 		)
 	case gg.KeyN:
 		absPos := t.AbsPosition()
 		t.SetAbsPosition(
-			absPos.Add(gg.V(100*c.Dt()*d, 0)),
+			absPos.Add(gg.V(100*dt*d, 0)),
 		)
 	case gg.KeyV:
 			t.Rotation += d * gg.Pi * 0.3 * dt

engine.go

@@ -61,12 +61,12 @@ type Engine struct {
 	// If is set to nil then the engine will panic.
 	Camera *Camera
 
-	lastTime time.Time
-	dt Float
+	drawLastTime time.Time
+	drawdt Duration
 
 	// Frame delta time.
-	fdt Float
-	fLastTime time.Time
+	dt Duration
+	lastTime time.Time
 
 	// Temporary stuff 
 	keys, prevKeys []Key
@@ -228,7 +228,7 @@ func (e *Engine) AbsCursorPosition() Vector {
 
 func (e *engine) Update() error {
 	eng := (*Engine)(e)
-	e.fdt = time.Since(e.fLastTime).Seconds()
+	e.dt = time.Since(e.lastTime)
 
 	// Buffering the context for faster.
 
@@ -302,7 +302,7 @@ func (e *engine) Update() error {
 		object.Input() <- c
 	}
 	e.wg.Wait()
-	e.fLastTime = time.Now()
+	e.lastTime = time.Now()
 	e.frame++
 	return nil
 }
@@ -323,7 +323,7 @@ var (
 	defaultTriOptions = &ebiten.DrawTrianglesOptions{}
 )
 func (e *engine) Draw(img *ebiten.Image) {
-	e.dt = time.Since(e.lastTime).Seconds()
+	e.drawdt = time.Since(e.drawLastTime)
 	eng := (*Engine)(e)
 	m := map[Layer][]Drawer{}
 	for _, object := range eng.Objects.store {
@@ -378,7 +378,7 @@ func (e *engine) Draw(img *ebiten.Image) {
 
 	// Empty the buff to generate it again.
 	eng.Camera.buffered = false
-	e.lastTime = time.Now()
+	e.drawLastTime = time.Now()
 	e.dframe++
 }
 
@@ -391,8 +391,8 @@ func (e *engine) Layout(ow, oh int) (int, int) {
 }
 
 // Return the delta time.
-func (e *Engine) Dt() Float {
-	return e.dt
+func (e *Engine) DrawDt() Duration {
+	return e.drawdt
 }
 
 func (e *Engine) Dframe() uint {
@@ -400,8 +400,8 @@ func (e *Engine) Dframe() uint {
 }
 
 // Return the current fixed delta time.
-func (e *Engine) Fdt() Float {
-	return 1/60
+func (e *Engine) Dt() Duration {
+	return e.dt
 }
 
 func (e *Engine) Frame() uint {

img.go

@@ -9,6 +9,11 @@ import (
 )
 
 type Image = ebiten.Image
+type ImageRect = image.Rectangle
+type ImagePoint = image.Point
+type ImageRectIndex struct {
+	X, Y int
+}
 
 type ColorV uint32
 type ColorM = ebiten.ColorM

time.go

@@ -7,3 +7,10 @@ import (
 type Time = time.Time
 type Duration = time.Duration
 
+const (
+	ZeroDuration Duration = 0
+	Microsecond = time.Microsecond
+	Millisecond = time.Millisecond
+	Second = time.Second
+)
+