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david4096/index.html

Created December 7, 2013 00:42
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Example used for n-body toy. Shows attractive nodes
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body{
padding: 0;
margin: 0;
background: white;
font-family: sans-serif;
}
rect {
fill: none;
pointer-events: all;
}
.node {
}
.inputs {transition: opacity .2s; text-align: left; position:absolute; font-family: sans-serif;
opacity: .5; color:#ccc; font-size: 10pt; color: #cdcdcf; position:absolute; display:block; size: 8em; top: 30px;}
em { size:14em; opacity: .8;}
.slideLog {
position:absolute;
left: 300px;
}
.inputs:hover {opacity: .8;}
.cursor {
fill: none;
stroke: #333;
pointer-events: none;
}
.slider {
height: 10px;
left: 3em;
width: 200px;
position: absolute;
right: 2px;
opacity: .82;
}
input[type='range'] {
-webkit-appearance: none;
padding-left:2px; padding-right:2px;
-webkit-border-radius: 5px;
opacity: .5;
background: #3ac;
}
input[type='range']::-webkit-slider-thumb {
-webkit-appearance: none;
background-color: #fff;
opacity: 1;
width: 10px;
height: 10px;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var currentWidth;
currentWidth = function() {
return [window.innerWidth, window.innerHeight];
}
var width = window.innerWidth,
height = window.innerHeight;
var fill = d3.scale.category20();
var force = d3.layout.force();
var trailLength = 1;
window.onresize = function() { force.size(currentWidth());}
function resize () {
force.size(currentWidth());
}
force
.size(currentWidth())
.nodes([{}, {}, {}]) // initialize with a single node
.linkDistance(30)
.charge(40)
.gravity(.05)
.on("tick", tick)
//oscillators.push(newOsc());
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
svg.append("rect")
.attr("width", width)
.attr("height", height);
var nodes = force.nodes(),
links = force.links(),
node = svg.selectAll(".node"),
link = svg.selectAll(".link");
var cursor = svg.append("circle")
.attr("r", 30)
.attr("transform", "translate(-100,-100)")
.attr("class", "cursor");
restart();
function mousemove() {
cursor.attr("transform", "translate(" + d3.mouse(this) + ")");
}
// TODO separate charges
var charges = [];
function mousedown(auto) {
if (force.nodes().length < 40000) {
var point = d3.mouse(this),
node = {x: point[0], y: point[1]},
n = nodes.push(node);
charges.push(30);
// oscillators.push(newOsc());
// add links to any nearby nodes
nodes.forEach(function(target) {
var x = target.x - node.x,
y = target.y - node.y;
if (Math.sqrt(x * x + y * y) < 30) {
links.push({source: node, target: target});
}
});
restart(); }
}
function distanceFromZero(d) {
return Math.sqrt ( (d.x - width / 2) * (d.x - width / 2) + (d.y - height / 2) * (d.y - height / 2) );
}
var totalEnergy = 0;
var lastTime = (new Date).getMilliseconds();
var maxE = 0;
var energies = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
function drawEnergy() {
if (totalEnergy > maxE) {
maxE = totalEnergy;
document.getElementById('maxE').style.color = d3.hsl(-200 + 2*Math.log(totalEnergy) % 360, .5, .8).toString();
document.getElementById('maxE').innerHTML = Math.round(totalEnergy);
}
energies.push(totalEnergy);
var avg;
avg = energies.reduce(function(prev, cur) {
return (cur + prev);
}, 0) / energies.length;
console.log(avg);
energies.shift();
if (!isNaN(avg)) {
document.getElementById('energy').style.color = d3.hsl(-200 + 2*Math.log(avg) % 360, .5, .8).toString();
document.getElementById('energy').innerHTML = Math.round(avg);
}
}
var lastTime = 0;
function drawFps(){
var now = (new Date).getTime();
document.getElementById('fps').innerHTML = Math.round(1000 / (now - lastTime));
lastTime = (new Date).getTime();
}
var sometimes = 0;
function tick() {
//force.charge(charges);
//drawFps();
//drawEnergy();
force.resume();
force.size(currentWidth());
link.attr("x1", function(d) { return d.source.x; }).attr("stroke",
function(d) {
var length = Math.sqrt(Math.pow(d.source.x - d.target.x, 2) + Math.pow(d.source.y - d.target.y, 2));
return d3.hsl(length, .5, .3).toString();
})
.attr("y1", function(d) { return d.source.y; })
.attr("x2", function(d) { return d.target.x; })
.attr("y2", function(d, i) {
return d.target.y;
});
//.attr("stroke", function(d) {
// console.log(d);
// return d3.hsl(distanceFromZero(d.source) % 360, .5, .5).toString();});
// requested to make color stick depending on where its placed
totalEnergy = 0;
node.attr("cx", function(d, i) { //console.log(oscillators[0]);
//updateFreq(oscillators[i], numberToNote(distanceFromZero(d) / 10)) ;
return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("fill", function(d) { //console.log(d3.hsl(d.x % 360, .5, .5).toString());
var energy = Math.pow(d.x - d.x_last, 2) + Math.pow(d.y - d.y_last, 2) ;
svg.insert("line", ":first-child")
.attr("stroke", d3.hsl(-200 + 68*Math.log(energy) % 360, .5, .1*Math.log(energy)).toString())
.attr("x1", function(v) {if (d.x_last == undefined) {return d.x;} else {return d.x_last;}})
.attr("y1", function(v) {if (d.y_last == undefined) {return d.y;} else {return d.y_last;}})
.attr("x2", d.x)
.attr("y2", d.y).attr("stroke-width", 1).transition().duration(trailLength)
//.transition().duration(10000).attr("transform", "scale(1.1) translate( " + width / 2 + " " + height / 2 + ")")
.remove();
//.transition().duration(10000).attr("transform", "scale(1.1) translate( -" + width / 2 + " " + height / 2 + ")")
d.x_last = d.x;
d.y_last = d.y;
// svg.append("circle")
// .attr("r", 2)
// .attr("fill", d3.hsl(distanceFromZero(d) % 360, .5, .5).toString())
// .attr("cx", d.x)
// .attr("cy", d.y)
// .transition().delay(10000)
// .remove()
totalEnergy = totalEnergy + energy;
return "blue";})
}
function removeTrails(){
d3.selectAll("line").remove();
}
function restart() {
link = link.data(links);
link.enter().insert("line", ".node")
.attr("class", "link");
node = node.data(nodes);
node.enter().insert("circle", ".cursor")
.attr("class", "node")
.attr("r", 3)
.call(force.drag);
force.start();
}
function sliderLog(obj, id) {
document.getElementById(id).innerHTML = obj.value;
}
</script>
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