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Canvas generated planets

A Pen By Captain Anonymous

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              <canvas id="c" width="1200" height="500"></canvas>
              var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');

function mkGradient(opts){
    opts.ctx.rect(0, 0, opts.r2*2, opts.r2*2);
  var g = opts.ctx.createRadialGradient(opts.r2*(opts.s ? .75:1), opts.r2*(opts.s ? .75:1), opts.r1, opts.r2*(opts.s ? .75:1), opts.r2*(opts.s ? .75:1), opts.r2);
    g.addColorStop(0, opts.c1);
    g.addColorStop(1, opts.c2);
    opts.ctx.fillStyle = g;

function mkPlanet(opts){
    var canvas = document.createElement('canvas');
    canvas.width = opts.r*2.4;
    canvas.height = opts.r*2.4;
    var ctx = canvas.getContext('2d');
    // Halo
        ctx: ctx,
        r1: opts.r,
        r2: opts.r*1.2,
        c1: opts.h1,
        c2: opts.h2
    // Translate to edge of halo.
    var offset = opts.r*1.2-opts.r;
    ctx.translate(offset, offset);

    /// Create planet outline clip
    ctx.arc(opts.r, opts.r, opts.r, 0, 2 * Math.PI);

    // Fill the ocean
        ctx: ctx,
        r1: 0,
        r2: opts.r,
        c1: opts.o2,
        c2: opts.o1
    // Add some continents
    for(var i=0;i<opts.r*20; i++){
        ctx.globalAlpha = Math.random()*.1
        var x = Math.random()*opts.r*2;
        var y = Math.random()*opts.r*2
        ctx.arc(x, y, Math.random()*(opts.r/5), 0, 2 * Math.PI);
        ctx.fillStyle = i > opts.r*10 ? opts.c3 : opts.c2;
    ctx.globalAlpha = 1.0
    // shadow
          ctx: ctx,
          r1: opts.r*.4,
          r2: opts.r,
          c1: 'rgba(0,0,0,0)',
          c2: 'rgba(0,0,0,.9)',
          s: true
          ctx: ctx,
          r1: opts.r*.95,
          r2: opts.r,
          c1: 'rgba(255,255,255,0)',
          c2: 'rgba(255,255,255,.6)'
    return canvas;

var earth = mkPlanet({
    o1: '#8a7359', // ocean 1
    o2: '#4c522c', // ocean color 2
    c2: '#1d80ef', // land color 1
    c3: '#080930', // land color 2
    h1: '#48d6f9', // halo color 1
    h2: 'rgba(134,59,249,0)', // halo color 2
    s: true

var europa = mkPlanet({
    o1: '#9f998d',
    o2: '#9f998d',
    c2: '#74301b',
    c3: '#6d6b79',
    h1: 'rgba(255,255,255,.5)',
    h2: 'rgba(134,59,249,0)',
    s: true

var mars = mkPlanet({
    o1: '#a56349',
    o2: '#a56349',
    c2: '#f7a27d',
    c3: '#603f36',
    h1: 'rgba(255,122,0,.5)',
    h2: 'rgba(255,12,0,0)',
    s: true

var sun = mkPlanet({
    o1: '#e91f00',
    o2: '#e91f00',
    c2: '#ffa614',
    c3: '#faf100',
    h1: 'rgba(255,122,0,1)',
    h2: 'rgba(255,12,0,0)',
    s: false


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