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