[英]Why does not save the chart in PNG format with html2canvas and canvas2image?
為什么不使用html2canvas
和canvas2image
以PNG格式保存圖表? 這是我的代碼的鏈接
<div class="canvas__container" style="width:100%; height:100%">
<button id="btnSave" title="Save as PNG" style="position: absolute; left: 4px; top: 4px;">Save</button>
<div id="myChart1"></div>
</div>
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/4.7.2/d3.min.js"></script>
<script src="//cdn.jsdelivr.net/npm/d3pie@0.2.1/d3pie/d3pie.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script src="//github.com/niklasvh/html2canvas/releases/download/0.4.1/html2canvas.js"></script>
<script src="//superal.github.io/canvas2image/canvas2image.js"></script>
<script>
$(function() {
$("#btnSave").click(function() {
html2canvas($("#myChart1"), {
onrendered: function (canvas) {
Canvas2Image.saveAsPNG(canvas, canvas.width, canvas.height, "Image_" + Date.now());
}
});
});
});
</script>
我找到了解決方案。 因為d3pie使用svg標記,所以必須使用saveSvgAsPng.js來保存圖表。 解
<div class="canvas__container" style="width:100%; height:100%">
<button id="btnSave" title="Save as PNG" style="position: absolute; left: 4px; top: 4px;">Save</button>
<div id="myChart1"></div>
</div>
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/4.7.2/d3.min.js"></script>
<script src="//cdn.jsdelivr.net/npm/d3pie@0.2.1/d3pie/d3pie.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="//exupero.org/saveSvgAsPng/src/saveSvgAsPng.js"></script>
<script>
$(function() {
$("#btnSave").click(function() {
saveSvgAsPng(document.getElementById("myChart1").getElementsByTagName("svg")[0], "plot_" + Date.now(), {scale: 2, backgroundColor: "#FFFFFF"});
});
});
</script>
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