I created a bar chart in D3.js and filled the bars with <pattern>. Now, I want to save the bar chart to a .svg file.
I followed the codes from this question. However, I can only save a bar chart without filling.
I think the problem is that the <pattern> is not a dom element, so it cannot be exported in this way.
Do you know how to solve this and save the bar chart with pattern to a svg file?
Here is my code. You can click the Save SVG button to save the svg file.
var btn = document.getElementById("btn");
var rotateRect = document.getElementById("rotateRect");
var data = [{ year: '2001', value:10 },
{ year: '2002', value:30 },
{ year: '2003', value:20 },
]
var svg = d3.select("svg#barchart"),
margin = 200,
width = svg.attr("width") - margin,
height = svg.attr("height") - margin
var xScale = d3.scaleBand().range([0, width]).padding(0.4),
yScale = d3.scaleLinear().range([height, 0]);
var g = svg.append("g")
.attr("transform", "translate(" + 100 + "," + 100 + ")");
xScale.domain(data.map(function(d) { return d.year; }));
yScale.domain([0, d3.max(data, function(d) { return d.value; })]);
g.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(xScale));
g.append("g")
.call(d3.axisLeft(yScale).tickFormat(function(d){
return d;
}).ticks(10));
g.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return xScale(d.year); })
.attr("y", function(d) { return yScale(d.value); })
.attr("width", xScale.bandwidth())
.attr("height", function(d) { return height - yScale(d.value); })
.attr('stroke', "black")
.attr('stroke-width', '1')
// .attr("fill", "white")
.attr("fill", function(d,i) { return "url(#pattern" + (i+1) +")"});
btn.onclick = function(){
console.log("save svg")
var svgData = $("#barchart")[0].outerHTML;
var svgBlob = new Blob([svgData], {type:"image/svg+xml;charset=utf-8"});
var svgUrl = URL.createObjectURL(svgBlob);
var downloadLink = document.createElement("a");
downloadLink.href = svgUrl;
downloadLink.download = "new.svg";
document.body.appendChild(downloadLink);
downloadLink.click();
document.body.removeChild(downloadLink);
}#rotateRect{
transform:rotate(45deg);
transform-origin: center center;
transform-box: fill-box;
}<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<svg id = "barchart" width="600" height="500"></svg>
<svg width="0" height="0">
<defs>
<pattern id="pattern1"
x="0" y="0" width="20" height="20"
patternUnits="userSpaceOnUse" >
<!-- <circle cx="10" cy="10" r="10" style="stroke: none; fill: #0000ff" /> -->
<rect id="rotateRect" x="5" y = "5" width = "10" height = "10" />
</pattern>
</defs>
<defs>
<pattern id="pattern2"
x="0" y="0" width="20" height="20"
patternUnits="userSpaceOnUse" >
<circle cx="10" cy="10" r="5" style="stroke: none; fill: #0000ff" />
</pattern>
</defs>
<defs>
<pattern id="pattern3"
x="0" y="0" width="20" height="20"
patternUnits="userSpaceOnUse" >
<circle cx="10" cy="10" r="3" style="stroke: none; fill: #0000ff" />
</pattern>
</defs>
</svg>
<button id="btn">Save SVG</button>What I want to get is a svg file looks like: 
What I got from my current code is a svg file looks like:
Thank you in advance.
