第二章 ActionScript 3.0学习之画星星（鼠标及键盘事件）

    今天觉得学到的比较有趣，所以记录之......~~~

    下面这段就是画出星星的代码：StarShape.as

package {
	import flash.display.Shape;
	import flash.display.GradientType;
	
	public class StarShape extends Shape {
		public function StarShape (x:Number = 50, y:Number = 50, points:int = 5, innerRadius:Number = 20, outerRadius:Number = 50, angle:Number = 0, color:uint = 0xff0000) {//x和y是起始点~~
			var count = Math.abs(points);
			this.graphics.lineStyle(2, 0x85DB18);
			//开始填色
			this.graphics.beginFill(color);
			if (count > 2) {
				//init vars
				var step, halfStep, start, n, dx, dy;
				//计算两点之间的距离
				step = (Math.PI * 2) / points;
				halfStep = step / 2;
				//起始角度
				start = (angle / 180) * Math.PI;
				this.graphics.moveTo(x + (Math.cos(start) * outerRadius), y - (Math.sin(start) * outerRadius));
				//画星状图的边
				for (n = 1; n <= count; n++) {
					dx = x + Math.cos(start + (step * n) - halfStep) * innerRadius;
					dy = y - Math.sin(start + (step * n) - halfStep) * innerRadius;
					this.graphics.lineTo(dx, dy);
					dx = x + Math.cos(start + (step * n)) * outerRadius;
					dy = y - Math.sin(start + (step * n)) * outerRadius;
					this.graphics.lineTo(dx, dy);
				}
			}
			this.graphics.endFill();
		}
	}
}

　　具体显示效果如下：

鼠标点击和键盘按下事件练习（按下的按键是Alt，Shift，Ctrl,单个或两两组合，三个一起，同时点击鼠标）：

源码：

SampleMouseAndkey.as

package {
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	
	public class SampleMouseAndKey extends Sprite {
		public function SampleMouseAndKey() {
			this.stage.addEventListener(MouseEvent.CLICK, clickHandler);
		}
		private function clickHandler(evt:MouseEvent):void {
			var color:uint = 0xffffff;
			if (evt.ctrlKey) color = 0x66cc00;
			if (evt.altKey) color = 0x669933;
			if (evt.shiftKey) color = 0x66ff00;
			//按两个键
			if (evt.altKey && evt.ctrlKey) color = 0xffcc00;
			if (evt.altKey && evt.shiftKey) color = 0xffff00;
			//三个键//转载注明原文地址：http://www.cnblogs.com/xianfangloveyangmei/p/4425589.html
			if (evt.altKey && evt.ctrlKey && evt.shiftKey) color = 0xff9900;
			trace("click:" + color.toString(16));
			var star:StarShape = new StarShape(evt.stageX, evt.stageY, 5, 10, 20, 0, color);
			addChild(star);
			var clear_star:
		}
	}
}

　　

效果：(背景白色，鼠标单击可以看到画出的效果)

下面的带清舞台（其实是创建子对象覆盖）：

修改后的SampleMouseAndkey.as

package {
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	
	public class SampleMouseAndKey extends Sprite {
		public function SampleMouseAndKey() {
			this.stage.addEventListener(MouseEvent.CLICK, clickHandler);
		}
		private function clickHandler(evt:MouseEvent):void {
			var clear:Sprite = new clear_stage(0, 0, 400, 400);
			var color:uint = 0xffffff;
			if(!(evt.altKey && evt.ctrlKey && evt.shiftKey)){
				if (evt.ctrlKey) color = 0x66cc00;
				if (evt.altKey) color = 0x669933;
				if (evt.shiftKey) color = 0x66ff00;
				//按两个键
				if (evt.altKey && evt.ctrlKey) color = 0xffcc00;
				if (evt.altKey && evt.shiftKey) color = 0xffff00;
				//三个键
				//if (evt.altKey && evt.ctrlKey && evt.shiftKey) color = 0xff9900;
				trace("click:" + color.toString(16));
				var star:StarShape = new StarShape(evt.stageX, evt.stageY, 5, 10, 20, 0, color);
				addChild(star);//先画了星星
			}
			if (evt.altKey && evt.ctrlKey && evt.shiftKey) {
				var clear:Sprite = new clear_stage(0, 0, 400, 400);
				addChild(clear);
			}
			
		}
	}
}
import flash.display.Sprite;
class clear_stage extends Sprite {//清理舞台
	public function clear_stage(x:Number, y:Number, w:Number, h:Number) {
		this.graphics.beginFill(0xFFFFFF);
		this.graphics.drawRect(x, y, w, h);
		this.graphics.endFill();
		//trace("........");
	}
}

具体效果如下（同时按Alt，Shift，Ctrl,同时单击击鼠标左键清舞台）：舞台白色~~~

可以测试一下上面的点击结果哦，嘻嘻~~新手笔记！！大婶别吐。