在Fabric.js中设置对象拖动限制 [英] Set object drag limit in Fabric.js

问题描述

我是Fabric JS的新手，想要设置拖动限制

i am new in fabric js want to set the drag limit

我也尝试使用 https://github.com/kangax /fabric.js/wiki/事件处理

无法获得解决方案.

请检查附件中的图像，对象可以移动任何软件，但应仅在红色区域显示.我想要这个.帮帮我...谢谢！

please check the attached image, object can move anyware but it should be display in red area only.i want this. help me...thanks in advance !!

推荐答案

对我有用的是为object:moving事件创建事件侦听器.当移动发生时，您将更新toptop和goodleft变量，并且一旦超出范围就将对象重新定位到最后一个好点.

What had worked for me is to create an event listener for the object:moving event. When the move is happening you update the goodtop and goodleft variables and once you are out of bounds to reposition the object to the last good points.

var goodtop, goodleft, boundingObject;

canvas.on("object:moving", function(){
    var obj = this.relatedTarget;
    var bounds = boundingObject;
    obj.setCoords();
    if(!obj.isContainedWithinObject(bounds)){
        obj.setTop(goodtop);
        obj.setLeft(goodleft);
        canvas.refresh();    
    } else {
        goodtop = obj.top;
        goodleft = obj.left;
    }  
});

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