多个可编辑多边形FabricJS

Question

我正在尝试制作多个可编辑的多边形，结构中是否有一个功能可以选择对象并使之可编辑，或者我必须手工实现。绘制多个多边形的代码示例如下：https://codepen.io/durga598/pen/gXQjdw

generatePolygon : function(pointArray){
    var points = new Array();
    $.each(pointArray,function(index,point){
        points.push({
            x:point.left,
            y:point.top
        });
        canvas.remove(point);
    });
    $.each(lineArray,function(index,line){
        canvas.remove(line);
    });
    canvas.remove(activeShape).remove(activeLine);
    var polygon = new fabric.Polygon(points,{
        stroke:'#333333',
        strokeWidth:0.5,
        fill: 'red',
        opacity: 1,
        hasBorders: false,
        hasControls: false
    });
    canvas.add(polygon);

    activeLine = null;
    activeShape = null;
    polygonMode = false;
    canvas.selection = true;
}

};