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。