earthjs/.block

## .block
license: mit

## README.md

      
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              README.md
            
          
    An attempt at panning and zooming with Orthographic projection.
forked from curran's block: Orthographic Zoom

  
## index.html
<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://d3js.org/topojson.v1.min.js"></script>
</head>
<body>
  <svg width="960" height="500"></svg>
  <script>
    const svg = d3.select('svg');
    const path = svg.append('path');
    const projection = d3.geoOrthographic();
    const initialScale = projection.scale();
    const geoPath = d3.geoPath().projection(projection);
    const sensitivity = 58;

    d3.json('world-110m.json', (error, world) => {
      const land = topojson.feature(world, world.objects.land);
      const render = () => path.attr('d', geoPath(land));
      render();
      svg
        .call(d3.drag().filter(_ => {
        	const {touches} = d3.event;
          return (touches===undefined || touches.length===1)
        }).on('drag', () => {
          const rotate = projection.rotate();
          const k = sensitivity / projection.scale();
          projection.rotate([
            rotate[0] + d3.event.dx * k,
            rotate[1] - d3.event.dy * k
          ])
          render();
        }))
        .call(d3.zoom().on('zoom', () => {
          projection.scale(initialScale * d3.event.transform.k);
          render();
        }));
    });
  </script>
</body>

## world-110m.json

      
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              world-110m.json
            
          
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	<!DOCTYPE html>
	<head>
	<meta charset="utf-8">
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="https://d3js.org/topojson.v1.min.js"></script>
	</head>
	<body>
	<svg width="960" height="500"></svg>
	<script>
	const svg = d3.select('svg');
	const path = svg.append('path');
	const projection = d3.geoOrthographic();
	const initialScale = projection.scale();
	const geoPath = d3.geoPath().projection(projection);
	const sensitivity = 58;

	d3.json('world-110m.json', (error, world) => {
	const land = topojson.feature(world, world.objects.land);
	const render = () => path.attr('d', geoPath(land));
	render();
	svg
	.call(d3.drag().filter(_ => {
	const {touches} = d3.event;
	return (touches===undefined \|\| touches.length===1)
	}).on('drag', () => {
	const rotate = projection.rotate();
	const k = sensitivity / projection.scale();
	projection.rotate([
	rotate[0] + d3.event.dx * k,
	rotate[1] - d3.event.dy * k
	])
	render();
	}))
	.call(d3.zoom().on('zoom', () => {
	projection.scale(initialScale * d3.event.transform.k);
	render();
	}));
	});
	</script>
	</body>