我不知道如何对对象进行排序,然后重复添加和删除以对对象进行排序。
我在组对象上尝试过unshift
,但是它不保存状态。
$(document).on("click", "#addToGroup", function() {
var objects = canvas.getActiveObject();
if(objects && objects.type === "activeSelection") {
objects.toGroup();
canvas.requestRenderAll();
}
});
count = 1;
$(document).on("click", "#addObject", function() {
canvas.add(new fabric.Rect({
width: 100, height: 100, left: 100 + (count * 20), top: 20 + (count * 10), angle: -10,
fill: 'rgba(0,200,0,1)'
}));
});
答案 0 :(得分:1)
您可以使用fabric.Object.prototype.moveTo()。有一个未记录的行为:如果调用它的对象是组的一部分,则该对象将在组的_objects
数组内移动,从而在重绘组时有效地更改其z索引。
此外,请确保在此之后以某种方式强制面料重新绘制组。设置group.dirty = true
。
const canvas = new fabric.Canvas("c")
const a = new fabric.Rect({
width: 100,
height: 100,
left: 100,
top: 20,
angle: -10,
fill: 'rgba(0,200,0,1)'
})
const b = new fabric.Rect({
width: 50,
height: 100,
left: 150,
top: 50,
angle: 45,
stroke: '#eee',
strokeWidth: 10,
fill: 'rgba(0,0,200,1)'
})
const c = new fabric.Circle({
radius: 50,
left: 150,
top: 75,
fill: '#aac'
})
const group = new fabric.Group([a, b, c])
canvas.add(group).requestRenderAll()
document.querySelector('#b1').addEventListener('click', () => {
const bottomChild = group.getObjects()[0]
bottomChild.moveTo(group.size() - 1)
// force fabric to redraw the group
group.dirty = true
canvas.requestRenderAll()
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/2.4.6/fabric.js"></script>
<canvas id='c' width="400" height="200"></canvas>
<button id='b1'>move bottom to top</button>