An attempt to isolate odd behavior, where detail gets lost in buildings.
There's more details for the buildings than is coming through here.
Why could this be?
forked from curran's block: Orthographic Zoom II
Last active
February 13, 2018 11:22
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Why Losing Details?
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| license: mit |
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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 style="margin: 0px"> | |
| <svg width="960" height="500"></svg> | |
| <script> | |
| const svg = d3.select('svg'); | |
| const path = svg.append('path') | |
| .attr('fill', 'black') | |
| .attr('fill-opacity', 0.2) | |
| .attr('stroke', 'black'); | |
| const projection = d3.geoOrthographic() | |
| .rotate([71.09258526626792, -42.35885054083259, 0]) | |
| .scale(2430625.179); | |
| const initialScale = projection.scale(); | |
| const geoPath = d3.geoPath().projection(projection); | |
| d3.json('MIT-Buildings.topo.json', (error, world) => { | |
| console.log(world.objects.buildings) | |
| const land = topojson.feature(world, world.objects.buildings); | |
| const render = () => path.attr('d', geoPath(land)); | |
| render(); | |
| let rotate0, coords0; | |
| const coords = () => projection.rotate(rotate0) | |
| .invert([d3.event.x, d3.event.y]); | |
| svg | |
| .call(d3.drag() | |
| .on('start', () => { | |
| rotate0 = projection.rotate(); | |
| coords0 = coords(); | |
| }) | |
| .on('drag', () => { | |
| const coords1 = coords(); | |
| projection.rotate([ | |
| rotate0[0] + coords1[0] - coords0[0], | |
| rotate0[1] + coords1[1] - coords0[1], | |
| ]) | |
| render(); | |
| console.log(projection.rotate()) | |
| console.log(projection.scale()) | |
| }) | |
| // Goal: let zoom handle pinch gestures (not working correctly). | |
| .filter(() => !(d3.event.touches && d3.event.touches.length === 2)) | |
| ) | |
| .call(d3.zoom() | |
| .on('zoom', () => { | |
| projection.scale(initialScale * d3.event.transform.k); | |
| render(); | |
| }) | |
| ) | |
| }); | |
| </script> | |
| </body> |
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