Back-facing Hemisphere

.block

license: gpl-3.0

README.md

Testing a prototype new graphics pipeline for d3.geo. The red lines are the front hemisphere, while the gray lines are the back hemisphere. Back-hemisphere clipping is achieved by first clipping around the antipode of the front hemisphere, and then applying an additional rotation.

d3.js

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  var renderBack = d3.geo.pipeline()
      .source(d3.geo.jsonSource)
      .pipe(d3.geo.rotate, elapsed * .0002 + Math.PI, -elapsed * .0001, 0)
      .pipe(d3.geo.clipCircle, Math.PI / 2)
      .pipe(d3.geo.rotate, Math.PI, 0, 0)
      .pipe(d3.geo.project, d3.geo.orthographic, .3 / scale)
      .sink(d3.geom.contextSink, context)

  var renderFront = d3.geo.pipeline()
      .source(d3.geo.jsonSource)
      .pipe(d3.geo.rotate, elapsed * .0002, elapsed * .0001, 0)
      .pipe(d3.geo.clipCircle, Math.PI / 2)
      .pipe(d3.geo.project, d3.geo.orthographic, .3 / scale)
      .sink(d3.geom.contextSink, context);

  context.clearRect(0, 0, width, height);
  context.save();
  context.translate(width / 2, height / 2);
  context.scale(scale, -scale);

  context.beginPath();
  renderBack(graticule);
  context.lineWidth = 1 / scale;
  context.strokeStyle = "#999";
  context.stroke();

  context.beginPath();
  renderFront(graticule);
  context.lineWidth = 1.5 / scale;
  context.strokeStyle = "red";
  context.stroke();

  context.restore();
});

d3.select(self.frameElement).style("height", height + "px");

</script>

thumbnail.png