将画布转换为PDF
将画布转换为PDF
提问于 2018-05-28 23:57:57
是否可以使用JavaScript直接将画布转换为pdf？
还有另一种可能的方式，比如画布到IMG，然后IMG到pdf？
你能给我举个例子吗？
回答 2
Stack Overflow用户
发布于 2018-05-29 08:02:11
做了个小小的示范：
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
// draw a blue cloud
context.beginPath();
context.moveTo(170, 80);
context.bezierCurveTo(130, 100, 130, 150, 230, 150);
context.bezierCurveTo(250, 180, 320, 180, 340, 150);
context.bezierCurveTo(420, 150, 420, 120, 390, 100);
context.bezierCurveTo(430, 40, 370, 30, 340, 50);
context.bezierCurveTo(320, 5, 250, 20, 250, 50);
context.bezierCurveTo(200, 5, 150, 20, 170, 80);
context.closePath();
context.lineWidth = 5;
context.fillStyle = '#8ED6FF';
context.fill();
context.strokeStyle = '#0000ff';
context.stroke();
download.addEventListener("click", function() {
// only jpeg is supported by jsPDF
var imgData = canvas.toDataURL("image/jpeg", 1.0);
var pdf = new jsPDF();
pdf.addImage(imgData, 'JPEG', 0, 0);
pdf.save("download.pdf");
}, false);<script src="//cdnjs.cloudflare.com/ajax/libs/jspdf/1.3.3/jspdf.min.js"></script>
<canvas id="myCanvas" width="578" height="200"></canvas>
<button id="download">download</button>
Stack Overflow用户
发布于 2018-05-29 09:09:24
这个库画布元素的PDF表示，与其他建议的解决方案不同，后者将图像嵌入到PDF文档中。
//Create a new PDF canvas context.
var ctx = new canvas2pdf.Context(blobStream());
//draw your canvas like you would normally
ctx.fillStyle='yellow';
ctx.fillRect(100,100,100,100);
// more canvas drawing, etc...
//convert your PDF to a Blob and save to file
ctx.stream.on('finish', function () {
var blob = ctx.stream.toBlob('application/pdf');
saveAs(blob, 'example.pdf', true);
});
ctx.end();页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/-100004563
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