FabricJS选择处理多个对象

// 初始化 FabricJS 画布
var canvas = new fabric.Canvas('canvas');

// 添加一些对象到画布上
canvas.add(new fabric.Rect({ left: 100, top: 100, fill: 'red', width: 50, height: 50 }));
canvas.add(new fabric.Circle({ left: 200, top: 200, fill: 'blue', radius: 30 }));

// 启用多选功能
canvas.selection = true;

canvas.on('selection:created', function(event) {
    console.log('Selected objects:', event.selected);
});

canvas.on('selection:updated', function(event) {
    console.log('Updated selected objects:', event.selected);
});

function scaleSelectedObjects(factor) {
    var objects = canvas.getActiveObjects();
    objects.forEach(function(obj) {
        obj.scale(factor);
    });
    canvas.renderAll();
}

// 示例：将选中的对象放大两倍
scaleSelectedObjects(2);

canvas.discardActiveObject();
canvas.renderAll();