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I have the following problem: I am converting the svg plot created by d3.js but the png is completely different from svg.
SVG before converting
PNG after converting: 
How can I apply the same .css code to the convertion? Is there anyway to link to the .css file like when creating svg's?
svgtopng.js code:
d3.select("#save").on("click", function(){
var html = d3.select('#h3 svg')
.attr("version", 1.1)
.attr("xmlns", "http://www.w3.org/2000/svg")
//HERE I WAS TRYING WITH .style but I want to link all the css classes from .css file below//
.node().parentNode.innerHTML;
var imgsrc = 'data:image/svg+xml;base64,'+ btoa(html);
var img = '<img src="'+imgsrc+'">';
d3.select("#svgdataurl").html(img);
css code:
body {
font-family: 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
padding-left: 10px;
color: #222;
}
/* Histogram line areas */
.Histogram .line {
shape-rendering: crispEdges;
}
.LineChart .line {
stroke-width: 2px;
}
/* 2D Histogram bins */
.Histogram2D .tile {
shape-rendering: crispEdges;
}
/* Error bars */
.uncertainty {
stroke-width: 1px;
shape-rendering: crispEdges;
}
/* Axes */
.axis path {
fill: none;
stroke: #000;
stroke-width: 1px;
shape-rendering: crispEdges;
}
.axis .tick line {
stroke: #000;
stroke-width: 1px;
shape-rendering: crispEdges;
}
.grid {
fill: none;
stroke: #e0e0e0;
shape-rendering: crispEdges;
}
.axis-label {
font-size: 0.9em;
}
/* TextBox */
.TextBox rect {
shape-rendering: crispEdges;
}
/* Brush, i.e. zoom box */
.brush .extent {
fill: #000;
fill-opacity: 0.125;
stroke: #000;
stroke-opacity: 0.2;
stroke-width: 1px;
shape-rendering: crispEdges;
}
/* 'Clear zoom' text */
.clear-button {
cursor: pointer;
}
.clear-button rect {
fill: #eee;
stroke: #000;
stroke-width: 1px;
stroke-opacity: 0.125;
border-radius: 2px;
}
.clear-button:hover rect {
fill: #e4e4e4;
}
.clear-button:active rect {
fill: #ddd;
}
.zscale-box {
stroke: #000;
stroke-width: 1px;
shape-rendering: crispEdges;
}
HTML CODE:
<button id="save">Save as Image</button></h1>
<div id="svgdataurl"></div>
<span id="h3">
</span>
232
Essentially, you need to move the styles "inline" on the elements. Your g axis path for example goes from:
<g class="x axis" transform="translate(0,450)">
<path class="domain" d="M0,6V0H440V6"></path>
</g>
To:
<g class="x axis" transform="translate(0,450)">
<path class="domain" d="M0,6V0H440V6"
style="fill: none; stroke: #000; stroke-width: 1px; shape-rendering: crispEdges;">
</path>
</g>
There's some recursion tricks out there to do this but full recursion across all the elements is probably a bit of overkill (and gonna be slow).
I would either manually move the styles in line or do something to target the elements you care about. For instance, here's how your could fix the axis lines:
d3.selectAll('.axis path, .axis line, .axis').each(function() {
var element = this;
var computedStyle = getComputedStyle(element, null);
for (var i = 0; i < computedStyle.length; i++) {
var property = computedStyle.item(i);
var value = computedStyle.getPropertyValue(property);
element.style[property] = value;
}
});
Full working example:
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.axis {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
</style>
<body>
<button id="save">Save as Image</button>
<div id="svgdataurl"></div>
<span id="h3">
</span>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>
var margin = {
top: 20,
right: 20,
bottom: 30,
left: 40
},
width = 500 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var x = d3.scale.linear()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
var svg = d3.select("#h3").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
x.domain([0, 100]);
y.domain([0, 100]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end");
d3.select("#save").on("click", function() {
d3.selectAll('.axis path, .axis line, .axis').each(function() {
var element = this;
var computedStyle = getComputedStyle(element, null);
for (var i = 0; i < computedStyle.length; i++) {
var property = computedStyle.item(i);
var value = computedStyle.getPropertyValue(property);
element.style[property] = value;
}
});
var html = d3.select('#h3 svg')
.attr("version", 1.1)
.attr("xmlns", "http://www.w3.org/2000/svg")
//HERE I WAS TRYING WITH .style but I want to link all the css classes from .css file below//
.node().parentNode.innerHTML;
var imgsrc = 'data:image/svg+xml;base64,' + btoa(html);
var img = '<img src="' + imgsrc + '">';
d3.select("#svgdataurl").html(img);
});
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