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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
text { | |
font: bold 100px monospace; | |
cursor: move; | |
} | |
.enter { | |
fill: green; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v2.min.js?2.10.1"></script> | |
<script> | |
var alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".split(""); | |
var width = 960, | |
height = 500; | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.append("g") | |
.attr("transform", "translate(32," + (height / 2) + ")"); | |
var drag = d3.behavior.drag() | |
.on("drag", dragmove); | |
function dragmove(d) { | |
d3.select(this) | |
.attr("x", d3.event.x) | |
.attr("y", d3.event.y); | |
} | |
function update(data) { | |
// DATA JOIN | |
// Join new data with old elements, if any. | |
var text = svg.selectAll("text") | |
.data(data, function(d) { return d; }); | |
// UPDATE | |
// Update old elements as needed. | |
text.attr("class", "update") | |
.transition() | |
.duration(750) | |
.attr("x", function(d, i) { return i * 32; }); | |
// ENTER | |
// Create new elements as needed. | |
text.enter().append("text") | |
.attr("class", "enter") | |
.attr("dy", ".15em") | |
.attr("y", 0) | |
.attr("x", function(d, i) { return i * 34; }) | |
.style("fill-opacity", 1e-6) | |
.text(function(d) { return d; }) | |
.call(drag) | |
.transition() | |
.duration(750) | |
.attr("y", function(d,i) { return randomFromInterval(-140, 140); }) | |
.style("fill-opacity", 1); | |
// EXIT | |
// Remove old elements as needed. | |
text.exit() | |
.attr("class", "exit") | |
.transition() | |
.duration(750) | |
.attr("y", 60) | |
.style("fill-opacity", 1e-6) | |
.remove(); | |
} | |
function randomFromInterval(from,to) | |
{ | |
return Math.floor(Math.random()*(to-from+1)+from); | |
} | |
// The initial display. | |
update(alphabet); | |
</script> |
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