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sample 我想用鼠標在舞臺上畫一個矩形，但是矩形不能改變大小。Createjs，如何用鼠標在舞臺上畫一個矩形
這是代碼：
var planetText,selectBox=new createjs.Shape(),x, y, width, height;
stage.on('mousedown',function(event){
x = event.stageX;y = event.stageY;
selectBox.graphics.beginFill('#ffffff').drawRect(x, y, 100, 100);
selectBox.set({alpha:0.5});
planetText = new createjs.Text(x+','+y +','+0+','+0, "16px Arial", "#ffffff");
planetText.set({textAlign:'center',textBaseline:'middle',x:x,y:y});
//console.log(selectBox);
stage.addChild(selectBox);
stage.addChild(planetText);
stage.update();
});
stage.addEventListener('pressmove',function (event){
//console.log(event);
width = event.stageX - x;
height = event.stageY - y;
planetText.text = x + ',' + y +','+width+','+height;
//selectBox.set({w:width,h:height});
createjs.Tween.get(selectBox).to({width:width,height:height},100,createjs.Ease.bounceIn());
stage.update();
});
stage.on('pressup',function(event){
//console.log(self.selectBox);
createjs.Tween.get(selectBox).to({alpha:0},300,createjs.Ease.bounceIn());
stage.removeChild(selectBox);
stage.update();
});
如何固定它，THX〜