codybuell/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Orbiting planets and moons with D3.js, inspired by Jan van der Laan's Planetarium.  Orbital speeds are roughly scaled relative to one another.

  
## index.html
<!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>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	<!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>