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Ch. 8, Fig. 10 - D3.js in Action
Raw
readme.md

This is the code for Chapter 8, Figure 10 from D3.js in Action that creates an image gallery with image elements that increase in size on mouseover.

Raw
index.html
<html>
<head>
<title>D3 in Action Chapter 8 - Example 8</title>
<meta charset="utf-8" />
<script src="https://d3js.org/colorbrewer.v1.min.js" type="text/JavaScript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
</head>
<style>
tr {
border: 1px gray solid;
}
td {
border: 2px black solid;
}
div.table {
position:relative;
}
div.data {
position: absolute;
width: 90px;
padding: 0 5px;
}
div.head {
position: absolute;
}
div.datarow {
position: absolute;
width: 100%;
border-top: 2px black solid;
background: white;
height: 35px;
overflow: hidden;
}
div.gallery {
position: relative;
}
img.infinite {
position: absolute;
background: rgba(255,255,255,0);
border-width: 1px;
border-style: solid;
border-color: rgba(0,0,0,0);
}
</style>
<body>
<div id="traditional">
</div>
</body>
<footer>
<script>
imageArray = [];
d3.select("#traditional").append("canvas").attr("height", 500).attr("width", 500);
var context = d3.select("canvas").node().getContext("2d");
context.textAlign = "center";
context.font="200px Georgia";
colorScale = d3.scale.quantize().domain([0,1]).range(colorbrewer.Reds[7]);
lineScale = d3.scale.quantize().domain([0,1]).range([10,40]);
for (var x=0;x<100;x++) {
context.clearRect(0,0,500,500);
context.strokeStyle = colorScale(Math.random());
context.lineWidth = lineScale(Math.random());
context.fillStyle = colorScale(Math.random());
context.beginPath();
context.arc(250,250,200,0,2*Math.PI);
context.fill();
context.stroke();
context.fillStyle = "black";
context.fillText(x,250,280);
var dataURL = d3.select("canvas").node().toDataURL();
imageArray.push({x: x, url: dataURL});
}
imgPerLine = 8;
d3.select("canvas").remove();
d3.select("#traditional")
.append("div").attr("class", "gallery")
.selectAll("img").data(imageArray).enter().append("img")
.attr("class", "infinite")
.attr("src", function(d) {return d.url})
redrawGallery();
d3.selectAll("img")
.on("mouseover", highlightImage)
.on("mouseout", dehighlightImage)
function redrawGallery() {
var newWidth = parseFloat(d3.select("div.gallery").node().clientWidth);
var imageSize = newWidth / imgPerLine;
function imgX(x) {
return Math.floor(x / imgPerLine) * imageSize;
}
function imgY(x) {
return Math.floor(x%imgPerLine * imageSize)
}
d3.selectAll("img")
.style("width", newWidth / imgPerLine)
.style("top", function(d) {return imgX(d.x)})
.style("left", function(d) {return imgY(d.x)})
}
function highlightImage(d) {
var newWidth = parseFloat(d3.select("div.gallery").node().clientWidth);
var imageSize = newWidth / 8;
d3.select(this).transition().duration(500).style("width", imageSize * 2)
.style("background", "rgba(255,255,255,1)")
.style("border-color", "rgba(0,0,0,1)");
this.parentNode.appendChild(this)
}
function dehighlightImage(d) {
var newWidth = parseFloat(d3.select("div.gallery").node().clientWidth);
var imageSize = newWidth / 8;
d3.select(this).transition().duration(500).style("width", imageSize)
.style("background", "rgba(255,255,255,0)")
.style("border-color", "rgba(0,0,0,0)")
}
window.onresize = function(event) {
redrawGallery();
}
</script>
</footer>
</html>
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