Coroutine 类型从IEnumerable为Iterator

source/src/ECS/Components/Renderables/Sprites/Sprite.ts

@@ -0,0 +1,62 @@
+module es {
+    import RenderTexture = egret.RenderTexture;
+    import Bitmap = egret.Bitmap;
+    import SpriteSheet = egret.SpriteSheet;
+
+    export class Sprite {
+        public texture2D: egret.Texture;
+        public readonly sourceRect: Rectangle;
+        public readonly center: Vector2;
+        public origin: Vector2;
+        public readonly uvs: Rectangle = new Rectangle();
+
+        constructor(texture: egret.Texture,
+                    sourceRect: Rectangle = new Rectangle(0, 0, texture.textureWidth, texture.textureHeight),
+                    origin: Vector2 = sourceRect.getHalfSize()) {
+            this.texture2D = texture;
+            this.sourceRect = sourceRect;
+            this.center = new Vector2(sourceRect.width * 0.5, sourceRect.height * 0.5);
+            this.origin = origin;
+
+            let inverseTexW = 1 / texture.textureWidth;
+            let inverseTexH = 1 / texture.textureHeight;
+
+            this.uvs.x = sourceRect.x * inverseTexW;
+            this.uvs.y = sourceRect.y * inverseTexH;
+            this.uvs.width = sourceRect.width * inverseTexW;
+            this.uvs.height = sourceRect.height * inverseTexH;
+        }
+
+        /**
+         * 提供一个精灵的列/行等间隔的图集的精灵列表
+         * @param texture
+         * @param cellWidth
+         * @param cellHeight
+         * @param cellOffset 处理时要包含的第一个单元格。基于0的索引
+         * @param maxCellsToInclude 包含的最大单元
+         */
+        public static spritesFromAtlas(texture: egret.Texture, cellWidth: number, cellHeight: number,
+                                       cellOffset: number = 0, maxCellsToInclude: number = Number.MAX_VALUE){
+            let sprites: Sprite[] = [];
+            let cols = texture.textureWidth / cellWidth;
+            let rows = texture.textureHeight / cellHeight;
+            let i = 0;
+            let spriteSheet = new SpriteSheet(texture);
+
+            for (let y = 0; y < rows; y ++){
+                for (let x = 0; x < cols; x ++) {
+                    if (i++ < cellOffset) continue;
+
+                    let texture = spriteSheet.getTexture(`${y}_${x}`);
+                    if (!texture)
+                        texture = spriteSheet.createTexture(`${y}_${x}`, x * cellWidth, y * cellHeight, cellWidth, cellHeight);
+                    sprites.push(new Sprite(texture));
+
+                    if (sprites.length == maxCellsToInclude) return sprites;
+                }
+            }
+
+            return sprites;
+        }
+    }
+}