接收鼠标事件-画线

Posted by admin in ActionScript 2 & 3一 20th, 2010 | no responses

下面的完整例子通过一个绘图程序演示了各种鼠标事件，无论何时鼠标按下，绘图将立即开始，当移动鼠标，一条线跟着鼠标显示出来，当松开鼠标，绘图终止：

例子代码：

package {
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	public class DrawingDemo extends Sprite {
	    // Flag to indicate whether the mouse is in draw mode
	    private var _drawing:Boolean;
	   public function DrawingDemo(   ) {//  设置线条样式
		graphics.lineStyle( 2, 0xFF0000 );
		//  按住鼠标就绘图
		_drawing = false;
		//  监听鼠标事件
		stage.addEventListener( MouseEvent.MOUSE_DOWN, startDrawing );
		stage.addEventListener( MouseEvent.MOUSE_MOVE, draw );
		stage.addEventListener( MouseEvent.MOUSE_UP, stopDrawing );
		}
		public function startDrawing( event:MouseEvent ):void {
			//  绘制起点
			graphics.moveTo( mouseX, mouseY );
			_drawing = true;
		}
		public function draw( event:MouseEvent ):void {
			if (_drawing) {
				//  鼠标走到哪画到哪
				graphics.lineTo( mouseX, mouseY );
			}
		}
		public function stopDrawing( event:MouseEvent ):void {
			_drawing = false;
		}
	}
}