再学AS3(五)：鼠绘.docx

再学AS3（五）：鼠绘知识点：1、添加鼠标监听事件MouseEvent；2、规定画布大小；3、moveTo和lineTo；4、绘制开始与结束判断。代码：varhuabu:Sprite=new Sprite(); huabu.graphics.beginFill(0xFFFFFF); huabu.graphics.drawRect(20,20,510,360); huabu.graphics.endFill(); addChild(huabu); var _drawing:Boolean; varquxian:Sprite=new Sprite(); quxian.graphics.lineStyle( 2, 0xFF0000 ); huabu.addChild(quxian); _drawing = false; huabu.addEventListener( MouseEvent.MOUSE_DOWN, startDrawing ); huabu.addEventListener( MouseEvent.MOUSE_MOVE,moving); huabu.addEventListener( MouseEvent.MOUSE_UP, stopDrawing ); stage.addEventListener(MouseEvent.MOUSE_UP,stopDrawing); function startDrawing( event:MouseEvent ):void { quxian.graphics.moveTo( mouseX, mouseY ); _drawing = true; } function moving( event:MouseEvent ):void { if ( _drawing ) { quxian.graphics.lineTo( mouseX, mouseY ); } } function stopDrawing( event:MouseEvent ):void { _drawing = false; }（2）：直线知识点：1、添加鼠标监听事件MouseEvent；2、规定画布大小；3、moveTo和lineTo；4、绘制开始与结束判断。难点：绘制多条直线代码：varhuabu:Sprite=new Sprite(); huabu.graphics.beginFill(0xFFFFFF); huabu.graphics.drawRect(20,20,510,360); huabu.graphics.endFill(); addChild(huabu); var _drawing:Boolean=false; varzhixian:Sprite=new Sprite(); huabu.addChild(zhixian); var _color:Number=0xFF0000; varzx:int=1; varys_x:Number; varys_y:Number; huabu.addEventListener( MouseEvent.MOUSE_DOWN, startDrawing ); huabu.addEventListener( MouseEvent.MOUSE_MOVE,moving); huabu.addEventListener( MouseEvent.MOUSE_UP, stopDrawing ); stage.addEventListener( MouseEvent.MOUSE_UP, stopDrawing ); function startDrawing( event:MouseEvent ):void { ys_x=mouseX; ys_y=mouseY; _drawing = true; } function moving( event:MouseEvent ):void { if (_drawing) { huabu.removeChild(zhixian); zhixian=new Sprite(); zhixian.graphics.lineStyle( zx, _color ); zhixian.graphics.moveTo(ys_x,ys_y); zhixian.graphics.lineTo(mouseX,mouseY); huabu.addChild(zhixian); } } function stopDrawing( event:MouseEvent ):void { zhixian=new Sprite(); huabu.addChild(zhixian); //没有以上两句，只能画一条直线_drawing = false; }（3）：圆知识点：1、添加鼠