Animate sprite

gameobjects/animate.go

@@ -0,0 +1,76 @@
+package gameobjects
+
+import (
+	"github.com/faiface/pixel"
+	"github.com/faiface/pixel/pixelgl"
+)
+
+type Animate struct {
+	//PlayerVec pixel.Vec
+	Sprite   *pixel.Sprite
+	Up       []pixel.Rect
+	Down     []pixel.Rect
+	Left     []pixel.Rect
+	Right    []pixel.Rect
+	Idle     bool
+	Dir      int
+	Frame    int
+	Current  []pixel.Rect
+	SprSheet pixel.Picture
+}
+
+func NewAnimation(spriteSheet pixel.Picture, sprFrames []pixel.Rect) Animate {
+	var animation Animate
+	for i := 0; i < 3; i++ {
+		animation.Up = append(animation.Up, sprFrames[i])
+	}
+	for i := 3; i < 6; i++ {
+		animation.Right = append(animation.Right, sprFrames[i])
+	}
+	for i := 6; i < 9; i++ {
+		animation.Left = append(animation.Left, sprFrames[i])
+	}
+	for i := 9; i < 12; i++ {
+		animation.Down = append(animation.Down, sprFrames[i])
+	}
+
+	animation.Current = animation.Down
+	animation.SprSheet = spriteSheet
+	animation.Sprite = pixel.NewSprite(spriteSheet, animation.Current[0])
+	animation.Frame = 0
+	animation.Idle = false
+	return animation
+}
+
+var elapsedTime int64 = 0
+
+func (a *Animate) Update(dt int64) {
+	var direction int = a.Dir
+	switch direction {
+	case 0:
+		a.Current = a.Up
+	case 1:
+		a.Current = a.Down
+	case 2:
+		a.Current = a.Left
+	case 3:
+		a.Current = a.Right
+	}
+	elapsedTime += dt
+	if elapsedTime >= 1000000000/10 {
+		a.Frame++
+		elapsedTime -= 1000000000 / 10
+	}
+	if a.Frame >= 3 {
+		a.Frame = 0
+	}
+	if a.Idle {
+		a.Frame = 0
+	}
+	a.Sprite.Set(a.SprSheet, a.Current[a.Frame])
+}
+
+func (a *Animate) Render(win *pixelgl.Window, pVec pixel.Vec) {
+	a.Sprite.Draw(win, pixel.IM.Scaled(pixel.ZV, 4).Moved(pVec))
+
+}