Added keyframe animation and demo.

demo/keyframe/keyframe.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"github.com/DeKugelschieber/go-game"
+)
+
+const (
+	assets_dir = "src/github.com/DeKugelschieber/go-game/demo/keyframe/assets"
+)
+
+type Game struct{}
+
+func (g *Game) Setup() {
+	err := goga.LoadResFromFolder(assets_dir)
+
+	if err != nil {
+		panic(err)
+	}
+
+	tex, err := goga.GetTex("runningcat.png")
+
+	if err != nil {
+		panic(err)
+	}
+
+	// create a keyframe set
+	set := goga.NewKeyframeSet()
+	set.Add(goga.NewKeyframe(goga.Vec2{0, 0}, goga.Vec2{0.5, 0.25}))
+	set.Add(goga.NewKeyframe(goga.Vec2{0.5, 0}, goga.Vec2{1, 0.25}))
+	set.Add(goga.NewKeyframe(goga.Vec2{0, 0.25}, goga.Vec2{0.5, 0.5}))
+	set.Add(goga.NewKeyframe(goga.Vec2{0.5, 0.25}, goga.Vec2{1, 0.5}))
+	set.Add(goga.NewKeyframe(goga.Vec2{0, 0.5}, goga.Vec2{0.5, 0.75}))
+	set.Add(goga.NewKeyframe(goga.Vec2{0.5, 0.5}, goga.Vec2{1, 0.75}))
+	set.Add(goga.NewKeyframe(goga.Vec2{0, 0.75}, goga.Vec2{0.5, 1}))
+	set.Add(goga.NewKeyframe(goga.Vec2{0.5, 0.75}, goga.Vec2{1, 1}))
+
+	// create a new animated sprite
+	sprite := goga.NewAnimatedSprite(tex, set, 512, 256)
+	sprite.KeyframeAnimation = goga.NewKeyframeAnimation(0, 7, true, 20)
+
+	// add to renderer
+	renderer, ok := goga.GetSystemByName("keyframeRenderer").(*goga.KeyframeRenderer)
+
+	if !ok {
+		panic("Could not find renderer")
+	}
+
+	renderer.Add(sprite.Actor, sprite.Pos2D, sprite.Tex, sprite.KeyframeSet, sprite.KeyframeAnimation)
+}
+
+func (g *Game) Update(delta float64) {}
+
+func main() {
+	game := Game{}
+	options := goga.RunOptions{ClearColor: goga.Vec4{0, 0, 0, 0},
+		Resizable:           true,
+		SetViewportOnResize: true,
+		ExitOnClose:         true}
+	goga.Run(&game, &options)
+}