我目前遇到了问题。当希望转换使用JOINTJS图像创建的图表时,元素无法正确显示...
图表:
http://www.hostingpics.net/viewer.php?id=698706graph.png
转化:
http://www.hostingpics.net/viewer.php?id=867158graph2.png
这是我的代码:
var canvas = document.getElementById('canvas');
var svg = document.querySelector('svg');
var ctx = canvas.getContext('2d');
var data = (new XMLSerializer()).serializeToString(svg);
var DOMURL = window.URL || window.webkitURL || window;
var img = new Image();
var svgBlob = new Blob([data], {type: 'image/svg+xml;charset=utf-8'});
var url = DOMURL.createObjectURL(svgBlob);
img.onload = function () {
ctx.drawImage(img, 0, 0);
DOMURL.revokeObjectURL(url);
var imgURI = canvas
.toDataURL('image/png')
.replace('image/png', 'image/octet-stream');
triggerDownload(imgURI);
};
img.src = url;
经过大量研究,不同的代码,我仍然找不到解决方案。
提前谢谢!
答案 0 :(得分:3)
让我试着回答。
使用以下代码获取SVG编码数据并将其存储在var(此处为'encodedData')
中SELECT t.AccountID, upvt.Title, upvt.TheData
FROM dbo.StagingTable AS t
CROSS APPLY
(VALUES
('FreeText1', FreeText1),
('FreeText2', FreeText2),
('FreeText3', FreeText3),
('FreeText4', FreeText4)
) AS upvt (Title, TheData);
只需将SVG图像绘制到画布
即可var encodedData;
var s = new XMLSerializer().serializeToString(document.getElementById("ur_svg_id"));
encodedData = window.btoa(s);
将画布导出为PNG图像
var canvas = document.getElementById('canvas');
var ctx = c.getContext('2d');
ctx.drawSvg('data:image/svg+xml;base64,' + encodedData, 0, 0, 740, 1100);
简单一点!