08.FlppyBird-模拟重力

08.FlppyBird-模拟重力/08.FlppyBird-模拟重力.html

@@ -52,24 +52,19 @@
 			this.gravity = gravity; // 保存gravity
 
 			// 放到合适的位置
-			const { width, height } = this.getSize();
-			this.setPosition(
-				(winSize.height - height) / 2 - 100,
-				(winSize.width - width) / 2,
-			);
+			const { width, height } = this.size;
+			this.top = (winSize.height - height) / 2 - 100;
+			this.left = (winSize.width - width) / 2;
 		}
 
 		update() {
 			super.update();
 
-			let top = this.getPosition().top
-
 			// v = v0 + a * t²
 			this.speed += this.gravity; // 速度 = 速度 + 加速度 * 时间²
 
-			top += this.speed;  // 更新位置
+			this.top += this.speed;  // 更新位置
 
-			this.setPosition(top);
 		}
 	}
 
@@ -88,21 +83,20 @@
 			this.bg2 = bg2;
 			this.speed = speed;
 
-			bg1.setPosition(winSize.height - bg1.getSize().height); // 放在底部
-			bg2.setPosition(winSize.height - bg2.getSize().height); // 放在底部
+			bg1.top = winSize.height - bg1.size.height; // 放在底部
+			bg2.top = winSize.height - bg2.size.height; // 放在底部
 		}
 
 		update() {
 			super.update();
 			// 获取一些参数
-			let { top: bg1Top, left: bg1Left } = this.bg1.getPosition();
-			const bg1Width = this.bg1.getSize().width;
-			const bg2Top = this.bg2.getPosition().top;
+			let bg1Left = this.bg1.left;
+			const bg1Width = this.bg1.size.width;
 
 			// 计算位置
 			bg1Left -= this.speed;  // 计算位置
-			this.bg1.setPosition(bg1Top, bg1Left);  // 设置bg1的位置
-			this.bg2.setPosition(bg2Top, bg1Left + this.bg1.getSize().width);   // bg2跟在bg1后面
+			this.bg1.left = bg1Left;    // 设置bg1的位置
+			this.bg2.left = bg1Left + this.bg1.size.width;  // bg2跟在bg1后面
 
 			// 如果超出屏幕则交换bg1和bg2，为了做到循环滚动
 			if (bg1Left <= -bg1Width) {
@@ -129,7 +123,7 @@
 	const landMgr = new ScrollMgr("land", land1, land2, 5);
 
 	// 将背景放在地面的上面，因为默认top是0，子节点在内部定位在底部，所以只需要把背景定位在负的land的高度就可以了
-	bgMgr.setPosition(-land1.getSize().height);
+	bgMgr.top = -land1.size.height;
 </script>
 
 <script>

08.FlppyBird-模拟重力/08.FlppyBird-模拟重力.md

@@ -26,11 +26,9 @@ class Bird extends GameObject {
 		this.gravity = gravity; // 保存gravity
 
 		// 放到合适的位置
-		const { width, height } = this.getSize();
-		this.setPosition(
-			(winSize.height - height) / 2 - 100,
-			(winSize.width - width) / 2,
-		);
+		const { width, height } = this.size;
+		this.top = (winSize.height - height) / 2 - 100;
+		this.left = (winSize.width - width) / 2;
 	}
 
 	/* ... */
@@ -52,14 +50,11 @@ class Bird extends GameObject {
 	update() {
 		super.update();
 
-		let top = this.getPosition().top
-
 		// v = v0 + a * t²
 		this.speed += this.gravity; // 速度 = 速度 + 加速度 * 时间²
 
-		top += this.speed;  // 更新位置
+		this.top += this.speed;  // 更新位置
         
-		this.setPosition(top);
 	}
 }
 ```