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<!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>移动画布</title>
</head>
<body>
<canvas id="canvasBox" width="600" height="600" style="border: 1px solid #ccc;"></canvas>
<script src="../../script/fabric.js"></script>
<script>
// 官方案例
// http://fabricjs.com/fabric-intro-part-5
const canvas = new fabric.Canvas('canvasBox')
fabric.Image.fromURL('../../images/bg.jpg', img => {
canvas.setBackgroundImage(img)
canvas.renderAll()
})
canvas.on('mouse:down', function (opt) {
var evt = opt.e;
if (evt.altKey === true) {
this.isDragging = true
this.selection = false
this.lastPosX = evt.clientX
this.lastPosY = evt.clientY
}
})
canvas.on('mouse:move', function (opt) {
if (this.isDragging) {
var e = opt.e;
var vpt = this.viewportTransform;
vpt[4] += e.clientX - this.lastPosX
vpt[5] += e.clientY - this.lastPosY
this.requestRenderAll()
this.lastPosX = e.clientX
this.lastPosY = e.clientY
}
})
canvas.on('mouse:up', function (opt) {
// on mouse up we want to recalculate new interaction
// for all objects, so we call setViewportTransform
this.setViewportTransform(this.viewportTransform)
this.isDragging = false
this.selection = true
})
</script>
</body>
</html>
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