滚动精灵

2020-07-07 21:40:57 +08:00
parent 1870ee5e45
commit 3f6ab79894
9 changed files with 332 additions and 181 deletions
@@ -0,0 +1,37 @@
+///<reference path="./TiledSpriteRenderer.ts"/>
+class ScrollingSpriteRenderer extends TiledSpriteRenderer {
+    public scrollSpeedX = 15;
+    public scroolSpeedY = 0;
+    private _scrollX = 0;
+    private _scrollY = 0;
+
+    public update(){
+        this._scrollX += this.scrollSpeedX * Time.deltaTime;
+        this._scrollY += this.scroolSpeedY * Time.deltaTime;
+        this.sourceRect.x = this._scrollX;
+        this.sourceRect.y = this._scrollY;
+    }
+
+    public render(camera: Camera) {
+        if (!this.sprite)
+            return;
+
+        super.render(camera);
+
+        let renderTexture = new egret.RenderTexture();
+        let cacheBitmap = new egret.DisplayObjectContainer();
+        cacheBitmap.removeChildren();
+        cacheBitmap.addChild(this.leftTexture);
+        cacheBitmap.addChild(this.rightTexture);
+
+        this.leftTexture.x = this.sourceRect.x;
+        this.rightTexture.x = this.sourceRect.x - this.sourceRect.width;
+        this.leftTexture.y = this.sourceRect.y;
+        this.rightTexture.y = this.sourceRect.y;
+
+        cacheBitmap.cacheAsBitmap = true;
+        renderTexture.drawToTexture(cacheBitmap, new egret.Rectangle(0, 0, this.sourceRect.width, this.sourceRect.height));
+
+        this.bitmap.texture = renderTexture;
+    }
+}