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codybuell/README.md

Last active Oct 23, 2019
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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
width: 960px;
height: 500px;
position: relative;
}
#sun {
stroke: #666;
fill: #666;
}
.orbit {
stroke: #ccc;
fill: transparent;
}
.planet {
stroke: #666;
fill: #fff;
}
.moon {
stroke: #ccc;
fill: #fff;
}
</style>
</head>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
// establish variables
var w = 960;
var h = 500;
var x = (w/2) - 250;
var y = (h/2) - 150;
var t0 = new Date().setHours(0,0,0,0);
var delta = (Date.now() - t0);
// planets and moons
var planets = [
{ R: 23, r: 1, speed: -1.60, phi0: 35, moons: [ // mercury
]},
{ R: 45, r: 2, speed: -1.17, phi0: 185, moons: [ // venus
]},
{ R: 87, r: 2, speed: -1.00, phi0: 135, moons: [ // earth
{ R: 10, r: 1, speed: -9.00, phi0: 15 } // the moon
]},
{ R: 140, r: 1, speed: -0.80, phi0: 235, moons: [ // mars
{ R: 6, r: 0.5, speed: -3.80, phi0: 15 }, // phobos
{ R: 9, r: 0.5, speed: -2.80, phi0: 115 } // deimos
]},
{ R: 290, r: 22, speed: -0.43, phi0: 135, moons: [ // jupiter
{ R: 30, r: 2, speed: -7.70, phi0: 25 }, // io
{ R: 36, r: 1, speed: -2.45, phi0: 95 }, // europa
{ R: 49, r: 3, speed: -1.10, phi0: 125 }, // ganymede
{ R: 79, r: 2, speed: -0.50, phi0: 315 } // callisto
]},
{ R: 583, r: 18, speed: -0.32, phi0: 260, moons: [ // saturn
{ R: 28, r: 1, speed: -4.10, phi0: 120 }, // mimas
{ R: 33, r: 1, speed: -3.90, phi0: 20 }, // enceladus
{ R: 38, r: 1, speed: -3.60, phi0: 0 }, // tethys
{ R: 44, r: 1, speed: -3.20, phi0: 100 }, // dione
{ R: 58, r: 2, speed: -2.90, phi0: 300 }, // rhea
{ R: 98, r: 5, speed: -1.30, phi0: 180 }, // titan
{ R: 188, r: 2, speed: -0.10, phi0: 10 } // lapetus
]}
];
// insert svg element
var svg = d3.select('body').insert("svg")
.attr("width", w)
.attr("height", h);
// sun
svg.append("circle")
.attr("r", 10)
.attr("cx", x)
.attr("cy", y)
.attr("id", "sun");
// planet group
var container = svg.append("g")
.attr("id", "orbit_container")
.attr("transform", "translate(" + x + "," + y + ")");
// draw planets and moon clusters
container.selectAll("g.planet").data(planets).enter().append("g")
.attr("class", "planet_cluster").each(function(d, i) {
d3.select(this).append("circle").attr("class", "orbit")
.attr("r", d.R);
d3.select(this).append("circle").attr("r", d.r).attr("cx",d.R)
.attr("cy", 0).attr("class", "planet");
d3.select(this).append("g").attr("transform", "translate(" + d.R + ",0)")
.selectAll("g.moon").data(d.moons).enter().append("g")
.attr("class", "moon_cluster").each(function(d, i) {
d3.select(this).append("circle").attr("class", "orbit")
.attr("r", d.R);
d3.select(this).append("circle").attr("r", d.r).attr("cx",d.R)
.attr("cy", 0).attr("class", "moon");
})
.attr("transform", function(d) {
return "rotate(" + (d.phi0 + (delta * (d.speed/100))) + ")";
});
})
.attr("transform", function(d) {
return "rotate(" + (d.phi0 + (delta * (d.speed/100))) + ")";
});
// throttled rotaiton animations
setInterval(function(){
var delta = (Date.now() - t0);
svg.selectAll(".planet_cluster, .moon_cluster").attr("transform", function(d) {
return "rotate(" + (d.phi0 + (delta * (d.speed/100))) + ")";
});
}, 40);
</script>
</body>
</html>
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