Vue应用：Vue使用fabric.js实现局部截图与大图预览功能，上代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>使用fabric.js裁剪和显示图片</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/4.5.0/fabric.min.js"></script>
</head>
<body>
<canvas id="canvas" ></canvas>
<img id="sourceImage" src="YOUR URL" style="display: none;">
<script>
// var canvas = new fabric.Canvas('canvas');
var canvas = new fabric.StaticCanvas("canvas");
var sourceImage = document.getElementById('sourceImage');
//截图位置
const cropXywh = [821,3799,97,90]
fabric.Image.fromURL(sourceImage.src, function(img) {
canvas.add(img);
var text = new fabric.Text('这里是文本描述', {
left: 0,
top: 0,
fontSize: 16,
fill: 'red'
});
var textWidth = text.width; // 获取文本的宽度
var textHeight = text.height; // 获取文本的高度
img.set({
left: 0,
top: textHeight,
width: cropXywh[2],
height: cropXywh[3],
cropX: cropXywh[0], // 裁剪区域左上角x坐标
cropY: cropXywh[1], // 裁剪区域左上角y坐标
cropWidth: cropXywh[2], // 裁剪区域宽度
cropHeight: cropXywh[3] // 裁剪区域高度
});
let widths = [cropXywh[2],textWidth];
let maxWidth = Math.max(...widths);
let maxHeight = cropXywh[3]+textHeight;
canvas.setWidth(maxWidth);
canvas.setHeight(maxHeight);
canvas.add(text);
canvas.renderAll(); // 更新Canvas
//若使用elementui可以显示局部图放大效果
//let imgData = canvas.toDataURL({ format: "png", quality: 0.8 });
// imageData.value = [imgData]
// showImageViewer.value = true
});
</script>
</body>
</html>预览看下效果吧。
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