javascript - Poor Image Quality Inserting Google Charts into a PDF using JSPDF -


i'm trying render pdf view of reporting page contains google charts display data. going converting chart url encoded jpeg. image quality @ stage still once add pdf document using jspdf image quality severely reduced.

here's jsfiddle of current method: http://jsfiddle.net/5c5yx/3/

function getimgdata(chartcontainer) {     var chartarea = chartcontainer.getelementsbytagname('svg')[0].parentnode;     var svg = chartarea.innerhtml;     var chartdoc = chartcontainer.ownerdocument;     var canvas = chartdoc.createelement('canvas');     canvas.setattribute('width', chartarea.offsetwidth);     canvas.setattribute('height', chartarea.offsetheight);       canvas.setattribute(         'style',         'position: absolute; ' +         'top: ' + (-chartarea.offsetheight * 2) + 'px;' +         'left: ' + (-chartarea.offsetwidth * 2) + 'px;');     chartdoc.body.appendchild(canvas);     canvg(canvas, svg);     var imgdata = canvas.todataurl('image/jpeg');     doc.addimage(imgdata, "jpeg", 10,10);      doc.addimage(imgdata, "jpeg", 10,100);      canvas.parentnode.removechild(canvas);     return imgdata;   }

does know of fix or reason it's doing this? or if not; there different way can render pdf containing google chart data (client side preferably) ?

any appreciated!

most visualization api charts support #getimageuri method, returns uri string can use save .png image file. here docs on printing charts, can follow save them .png image instead: https://developers.google.com/chart/interactive/docs/printing. there should not quality loss importing .png file pdf.


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