.block

## .block
license: gpl-3.0

## README.md

      
        

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              README.md
            
          
        
      
    
  
    D3 3.0 supports three-axis rotation for geographic projections. This example demonstrates rotating lambda (λ), phi (φ) and gamma (γ) in three side-by-side orthographic projections.

  

  

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

.title {
  display: inline-block;
  font-size: 48px;
  line-height: 90px;
  text-align: center;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var diameter = 960 / 3,
    radius = diameter >> 1,
    velocity = .01,
    then = Date.now();

var projection = d3.geo.orthographic()
    .scale(radius - 2)
    .translate([radius, radius])
    .clipAngle(90)
    .precision(0);

d3.select("body").selectAll(".title")
    .data(["λ", "φ", "γ"])
  .enter().append("div")
    .attr("class", "title")
    .style("width", diameter + "px")
    .text(function(d) { return d; });

var canvas = d3.select("body").selectAll("canvas")
    .data(d3.range(3))
  .enter().append("canvas")
    .attr("width", diameter)
    .attr("height", diameter);

var path = d3.geo.path()
    .projection(projection);

d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) {
  if (error) throw error;

  var land = topojson.feature(world, world.objects.land),
      globe = {type: "Sphere"};

  d3.timer(function() {
    var angle = velocity * (Date.now() - then);
    canvas.each(function(i) {
      var rotate = [0, 0, 0], context = this.getContext("2d");
      rotate[i] = angle, projection.rotate(rotate);
      context.clearRect(0, 0, diameter, diameter);
      context.beginPath(), path.context(context)(land), context.fill();
      context.beginPath(), path(globe), context.stroke();
    });
  });
});

</script>

## thumbnail.png

      
        

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              thumbnail.png