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fabricjs-demo
/
tutorial
/
Object
/
intersectsWithObject.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>检测元素重叠intersectsWithObject</title>
</head>
<body>
<canvas id="c" width="500" height="500" style="border: 1px solid #ccc;"></canvas>

<script src="../../script/fabric.js"></script>
<script>
  let canvas = new fabric.Canvas('c')

  let rect = new fabric.Rect({
    left: 260,
    top: 110,
    width: 80,
    height: 60,
    fill: 'hotpink'
  })

  let circle = new fabric.Circle({
    top: 200,
    left: 150,
    radius: 30,
    fill: 'yellowgreen'
  })

  let triangle = new fabric.Triangle({
    width: 100,
    height: 100,
    left: 300,
    top: 200,
    fill: 'skyblue'
  })

  canvas.add(rect, circle, triangle)

  canvas.on({
    'object:moving': onChange,
    'object:scaling': onChange,
    'object:rotating': onChange
  })

  function onChange(options) {
    options.target.set('opacity', 1)
    canvas.forEachObject(function(obj) {
      if (obj === options.target) return
      // intersectsWithObject 可以检测元素是否相交（重叠）
      obj.set('opacity' ,options.target.intersectsWithObject(obj) ? 0.3 : 1)
    })
  }

</script>
</body>
</html>