Start v1.0 apis (sprite, animation, box2d, etc)

lib/components/animation_component.dart

@@ -0,0 +1,42 @@
+import 'dart:ui';
+
+import 'component.dart';
+import '../sprite.dart';
+
+class AnimationComponent extends PositionComponent {
+
+  double width, height;
+
+  List<Sprite> sprites;
+  double stepTime = 0.1;
+  double lifeTime = 0.0;
+
+  AnimationComponent.spriteList(this.width, this.height, this.sprites, { this.stepTime, this.lifeTime });
+
+  AnimationComponent.sequenced(this.width, this.height, String imagePath, int amount, { double textureX = 0.0, double textureY = 0.0, double textureWidth = -1.0, double textureHeight = -1.0}) {
+    angle = 0.0;
+    if (textureWidth == -1) {
+      textureWidth = this.width;
+    }
+    if (textureHeight == -1) {
+      textureHeight = this.height;
+    }
+    sprites = new List<Sprite>(amount);
+    for (var i = 0; i < amount; i++) {
+      sprites[i] = new Sprite(imagePath, x: textureX + i*textureWidth, y: textureY, width: textureWidth, height: textureHeight);
+    }
+  }
+
+  @override
+  void render(Canvas canvas) {
+    prepareCanvas(canvas);
+
+    int i = (lifeTime / stepTime).round();
+    sprites[i % sprites.length].render(canvas, width, height);
+  }
+
+  @override
+  void update(double t) {
+    this.lifeTime += t;
+  }
+}