My goal is to add an image into an existing circle with d3. The circle will render and is interactive with mouseover method, but only when I use "fill", "color", and not something more sophisticated like .append("image").
g.append("circle")
.attr("class", "logo")
.attr("cx", 700)
.attr("cy", 300)
.attr("r", 10)
.attr("fill", "black") // this code works OK
.attr("stroke", "white") // displays small black dot
.attr("stroke-width", 0.25)
.on("mouseover", function(){ // when I use .style("fill", "red") here, it works
d3.select(this)
.append("svg:image")
.attr("xlink:href", "/assets/images/logo.jpeg")
.attr("cx", 700)
.attr("cy", 300)
.attr("height", 10)
.attr("width", 10);
});
The image doesn’t show after I mouse over. Using Ruby on Rails app, where my image “logo.jpeg” is stored in the assets/images/ directory. Any help for getting my logo to show within the circle? Thanks.
Answer
As Lars says you need to use pattern, once you do that it becomes pretty straightforward. Here’s a link to a conversation in d3 google groups about this. I’ve set up a fiddle here using the image of a pint from that conversation and your code above.
To set up the pattern:
<svg id="mySvg" width="80" height="80">
<defs id="mdef">
<pattern id="image" x="0" y="0" height="40" width="40">
<image x="0" y="0" width="40" height="40" xlink:href="http://www.e-pint.com/epint.jpg"></image>
</pattern>
</defs>
</svg>
Then the d3 where we only change the fill:
svg.append("circle")
.attr("class", "logo")
.attr("cx", 225)
.attr("cy", 225)
.attr("r", 20)
.style("fill", "transparent")
.style("stroke", "black")
.style("stroke-width", 0.25)
.on("mouseover", function(){
d3.select(this)
.style("fill", "url(#image)");
})
.on("mouseout", function(){
d3.select(this)
.style("fill", "transparent");
});