javascript - 如何使用 jsPDF 保存大图像？

Question

我想通过 jsPDF 将大图像转换为 pdf。我的问题是为大图像做这件事。我想保持图像分辨率。我的图像大小以像素为单位，但我无法将大小设置为 jsPDF。我这样做:

var pdf = new jsPDF();
var imgData = 'data:image/png;base64,iV...';

pdf.setFontSize(40);
pdf.text(35, 25, "Octonyan loves jsPDF");
pdf.addImage(imgData, 'JPEG', 15, 40, 180, 180);
pdf.save();

在 jsFiddle 处运行.

代码创建 pdf 但不保护图像分辨率。

Answer 1

使用 new jsPDF('l', 'px', [pdfHeight, pdfWidth]); 第一个参数(横向或纵向)第二个是单位

这是 Jsfiddle

var imgData = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAERAAAATkCAMAAAA9GWtEAAAAllBMVEUAoujtHCQAoq2pHCTMZMupeuhfoujtHG3MHCQAjo6pTW01ZEo1oug1jsvtNo4AosvtHEpfTSSFNiQAem2FjujtTa3MNkpfeq2pNiQ1jujMV63MPG2FesuFTW3tNm0AjsupdsupaK01eo7MTY5fbXqFTUqpP0pfhMsAjq2pWY5fTUpfjug1ga01em2FZG2Fb601oq2pTa1nLp1vAAAi9klEQVR42uzBgQAAAACAoP2pF6kCAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGD24EAAAAAAAMj/tRFUVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYU9OBAAAAAAAPJ/bQRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWEPDgQAAAAAgPxfG0FVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVdiDAwEAAAAAIP/XRlBVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVFfbgQAAAAAAAyP+1EVRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVhT04EAAAAAAA8n9tBFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYQ8OBAAAAACA/F8bQVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV2IMDAQAAAAAg/9dGUFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVUV9uBAAAAAAADI/7URVFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWFPTgQAAAAAADyf20EVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVhDw4EAAAAAID8XxtBVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVXYgwMBAAAAACD/10ZQVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVRX24EAAAAAAAMj/tRFUVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYU9OBAAAAAAAPJ/bQRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWEPDgQAAAAAgPxfG0FVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVdiDAwEAAAAAIP/XRlBVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVFfbgQAAAAAAAyP+1EVRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVhT04EAAAAAAA8n9tBFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYQ8OBAAAAACA/F8bQVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV2IMDAQAAAAAg/9dGUFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVUV9uBAAAAAAADI/7URVFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWFPTgQAAAAAADyf20EVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVhDw4EAAAAAID8XxtBVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVXYgwMBAAAAACD/10ZQVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVRX24EAAAAAAAMj/tRFUVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYU9OBAAAAAAAPJ/bQRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWEPDgQAAAAAgPxfG0FVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVdiDAwEAAAAAIP/XRlBVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVFfbgQAAAAAAAyP+1EVRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVhT04EAAAAAAA8n9tBFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYQ8OBAAAAACA/F8bQVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV2IMDAQAAAAAg/9dGUFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVUV9uBAAAAAAADI/7URVFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWFPTgQAAAAAADyf20EVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVhDw4EAAAAAID8XxtBVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVXYgwMBAAAAACD/10ZQVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVRX24EAAAAAAAMj/tRFUVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYU9OBAAAAAAAPJ/bQRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVWEPDgQAAAAAgPxfG0FVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVdiDAwEAAAAAIP/XRlBVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVFfbgQAAAAAAAyP+1EVRVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVhT04EAAAAAAA8n9tBFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVYQ8OBAAAAACA/F8bQVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV2IMDAQAAAAAg/9dGUFVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVUVdu5ot2kYDMCoDe1Is4i2awqj3YqAraNTAfH+LwcXSFZEC6kdIRSdc538jnznT0kAAAAAAAAAAAAAAOCM98eHev/ml2397eldAAAAAEbq832dtOGU+X3dcbgqXzA5NOEyL9KA781AMeRhH0/YfugTRdIuZWsDAAAA8C/NqphMTxeIl7FrEgpcx65XVwUDpkPUkOcqnrXY9GgiaZcyTQMAAADwJ/9DEHndhAxpWFEQmd/EZB1KfbyNf7G7E0QAAABgZDKCSNEBfhULg8is6t5c5Hgbe9g9CSIAAAAwKllBZB2yLUuDyHK4lDB/jD1tGkEEAAAARiQriCza/OXKgkh6mPKvd75UsbdFK4gAAADAeGQFkTjJ/6VqYRBZDZVm5s/xIhNBBAAAAEYjI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var button = document.createElement('button');
var img = document.createElement('img');
img.src = imgData;
img.onload = function(){
button.onclick = function(){
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  var left = 15, top = 40;  
  
  var width = pdf.internal.pageSize.getWidth();
  var maxWidth = (width - left*2);
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  var newHeight = img.naturalHeight*newWidth/img.naturalWidth;
  
  var left = 15, top = 40;
  var pdf = new jsPDF('l', 'px', [img.naturalHeight+top*2, img.naturalWidth+left*2]);  
  
  pdf.setFontSize(40);
  pdf.text(35, 25, "Octonyan loves jsPDF");
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};
button.innerText = 'Create PDF and Download It'
document.body.appendChild(button);
}

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