我一直试图在边界内保持一个对象(在画布上用布料js构建).它是在移动和旋转它时实现的.为了达到这个目的,我在画布边界限制内从Move对象获取了帮助.但是当我开始缩放对象时,它只是继续走出边界.我不明白必须做什么才能将它保持在边界内,即使在缩放时也是如此.请帮我一个代码来防止这种行为.如果您也可以附加演示,那就太棒了.
<html>
<head>
<title>Basic usage</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.7.3/fabric.min.js"></script>
</head>
<body>
<canvas id="canvas" style= "border: 1px solid black" height= 480 width = 360></canvas>
<script>
var canvas = new fabric.Canvas('canvas');
canvas.add(new fabric.Circle({ radius: 30, fill: '#f55', top: 100, left: 100 }));
canvas.item(0).set({
borderColor: 'gray',
cornerColor: 'black',
cornerSize: 12,
transparentCorners: true
});
canvas.setActiveObject(canvas.item(0));
canvas.renderAll();
canvas.on('object:moving', function (e) {
var obj = e.target;
// if object is too big ignore
if(obj.currentHeight > obj.canvas.height || obj.currentWidth > obj.canvas.width){
return;
} …