kpdecker · June 18, 2014 06:18
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>
  <head>
  </head>
  <body>
    <canvas id="output" width="600" height="800"></canvas>

    <script>
      // Renderer code
      var output = document.getElementById('output'),
          context = output.getContext('2d');

      var LIGHTS_PER_METER = 30;
      var NUM_PIXELS = [
        5,
        10,

        5, 1, 2, 1,
        5, 1, 2, 1,
        5, 1, 2, 1
      ].map(function(value) { return Math.floor(value * LIGHTS_PER_METER); });

      var NUM_CIRCLES = 2,
          NUM_LINES = NUM_PIXELS.length - NUM_CIRCLES,
          
          FULL_CIRCLE = 2 * Math.PI,
          PX_PER_METER = 150,
          OUTER_RADIUS = 2,
          OFFSET = OUTER_RADIUS*PX_PER_METER,
          FOLD_RADIUS = 0.1,
          ROTATE = Math.PI / 4.1;

      function mapLine(line, pixelId) {
        if (line < NUM_CIRCLES) {
          // Circular components
          var radius = 5*(line+1)/FULL_CIRCLE,
              angle = FULL_CIRCLE * (pixelId / NUM_PIXELS[line]) + ROTATE;

          return [radius*Math.cos(angle), radius*Math.sin(angle), 0];
        } else {
          var lineOffset = line - NUM_CIRCLES,
              lineMod = lineOffset % 4,

              // A bit of a hack here. We want o fold one of the lines slightly early
              // to provide spacing between other objects displayed on the screen.
              // If rotate is changed then the special casing here will need to be adjusted.
              currentFold = lineOffset / 4 < 1 ? FOLD_RADIUS*1.8 : FOLD_RADIUS,

              angle = FULL_CIRCLE * lineOffset / NUM_LINES + ROTATE,
              radius = OUTER_RADIUS - pixelId / LIGHTS_PER_METER;

          if (!lineMod && radius < currentFold) {
            // Fake the depth for the components that are "folded over"
            return [
              currentFold*Math.cos(angle),
              currentFold*Math.sin(angle) - radius + currentFold,
              currentFold - radius
            ];
          } else {
            return [radius*Math.cos(angle), radius*Math.sin(angle), 0];
          }
        }
      }
      function lightPixel(line, pixel, color) {
        var map = mapLine(line, pixel);

        context.fillStyle = color;
        context.fillRect(OFFSET + PX_PER_METER*map[0], OFFSET + PX_PER_METER*map[1], 2, 2);
      }
    </script>

    <script>
      // Example code
      var COLORS = [
        '#f00',
        '#f00',

        '#000', '#555', '#4f4', '#555',
        '#000', '#555', '#4f4', '#555',
        '#000', '#555', '#4f4', '#555',
      ];
      for (var line = NUM_PIXELS.length; line; line--) {
        for (var pixel = 0; pixel < NUM_PIXELS[line-1]; pixel++) {
          lightPixel(line-1, pixel, COLORS[line-1]);
        }
      }
    </script>
  </body>
 </html>
	<!DOCTYPE html>
	<html>
	<head>
	</head>
	<body>
	<canvas id="output" width="600" height="800"></canvas>

	<script>
	// Renderer code
	var output = document.getElementById('output'),
	context = output.getContext('2d');

	var LIGHTS_PER_METER = 30;
	var NUM_PIXELS = [
	5,
	10,

	5, 1, 2, 1,
	5, 1, 2, 1,
	5, 1, 2, 1
	].map(function(value) { return Math.floor(value * LIGHTS_PER_METER); });

	var NUM_CIRCLES = 2,
	NUM_LINES = NUM_PIXELS.length - NUM_CIRCLES,

	FULL_CIRCLE = 2 * Math.PI,
	PX_PER_METER = 150,
	OUTER_RADIUS = 2,
	OFFSET = OUTER_RADIUS*PX_PER_METER,
	FOLD_RADIUS = 0.1,
	ROTATE = Math.PI / 4.1;

	function mapLine(line, pixelId) {
	if (line < NUM_CIRCLES) {
	// Circular components
	var radius = 5*(line+1)/FULL_CIRCLE,
	angle = FULL_CIRCLE * (pixelId / NUM_PIXELS[line]) + ROTATE;

	return [radiusMath.cos(angle), radiusMath.sin(angle), 0];
	} else {
	var lineOffset = line - NUM_CIRCLES,
	lineMod = lineOffset % 4,

	// A bit of a hack here. We want o fold one of the lines slightly early
	// to provide spacing between other objects displayed on the screen.
	// If rotate is changed then the special casing here will need to be adjusted.
	currentFold = lineOffset / 4 < 1 ? FOLD_RADIUS*1.8 : FOLD_RADIUS,

	angle = FULL_CIRCLE * lineOffset / NUM_LINES + ROTATE,
	radius = OUTER_RADIUS - pixelId / LIGHTS_PER_METER;

	if (!lineMod && radius < currentFold) {
	// Fake the depth for the components that are "folded over"
	return [
	currentFold*Math.cos(angle),
	currentFold*Math.sin(angle) - radius + currentFold,
	currentFold - radius
	];
	} else {
	return [radiusMath.cos(angle), radiusMath.sin(angle), 0];
	}
	}
	}
	function lightPixel(line, pixel, color) {
	var map = mapLine(line, pixel);

	context.fillStyle = color;
	context.fillRect(OFFSET + PX_PER_METERmap[0], OFFSET + PX_PER_METERmap[1], 2, 2);
	}
	</script>

	<script>
	// Example code
	var COLORS = [
	'#f00',
	'#f00',

	'#000', '#555', '#4f4', '#555',
	'#000', '#555', '#4f4', '#555',
	'#000', '#555', '#4f4', '#555',
	];
	for (var line = NUM_PIXELS.length; line; line--) {
	for (var pixel = 0; pixel < NUM_PIXELS[line-1]; pixel++) {
	lightPixel(line-1, pixel, COLORS[line-1]);
	}
	}
	</script>
	</body>
	</html>