最初,我通过控制对象的顶部和左侧值,使其超出画布区域来实例化Rect对象,以便Rect对象不会呈现在画布上。之后,改变Rect的顶部和左侧值,使其在事件处理程序的画布区域中,然后如何在画布上渲染Rect对象。如何渲染画布上的对象
下面的代码是一个演示:
<canvas id="canvas" width="800" height="600"></canvas>
<script src="js/fabric.js"></script>
<script>
(function() {
var canvas = this.__canvas = new fabric.Canvas('canvas');
fabric.Object.prototype.transparentCorners = false;
var targetLine = [], paramsG, paramsR;
for (var k = 0; k < 20; k++) {
paramsG = {
left: 200,
top: 530 - 100 * k,
width: 20,
height: 50,
visibile: false,
fill: '#62ab59',
hasBorders: false,
lockMovementX: true,
hasControls: false
};
paramsR = {
left: 200,
top: 580 - 100 * k,
width: 20,
height: 50,
visibile: false,
fill: '#ed5d5d',
hasBorders: false,
lockMovementX: true,
hasControls: false
};
canvas.add(new fabric.Rect(paramsG), new fabric.Rect(paramsR));
}
canvas.on('mouse:down', function (e) {
if (e.target) {
targetLine = getMemberByLeft(canvas._objects, e.target);
}
})
canvas.on('object:moving', function (e) {
targetLine.forEach(function (val) {
canvas._objects[val.index].set({top: e.e.movementY + canvas._objects[val.index].top});
})
canvas.renderAll();
})
function getMemberByLeft(arr, tar) {
var returnArr = [];
arr.forEach(function (value, key) {
if (value.left == tar.left && value != tar) {
returnArr.push({data: value, index: key});
}
})
return returnArr;
}
})();
</script>
你能提供代码吗你试过了@ volcano.y –