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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke-linejoin: round; | |
| } | |
| .sphere, | |
| .graticule { | |
| stroke: #aaa; | |
| } | |
| .orbit { | |
| stroke: red; | |
| stroke-width: 2px; | |
| } | |
| .equator { | |
| stroke: blue; | |
| stroke-width: 2px; | |
| stroke-dasharray: 15; | |
| } | |
| .start { | |
| stroke: black; | |
| fill: #0a0; | |
| stroke-width: 1px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = interpolatedProjection( | |
| d3.geo.orthographic() | |
| .rotate([30, -10]) | |
| .center([-30, 10]) | |
| .scale(240) | |
| .translate([width / 2, height / 2]), | |
| d3.geo.equirectangular() | |
| .scale(145) | |
| .translate([width / 2, height / 2])); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("path") | |
| .datum({type: "Sphere"}) | |
| .attr("class", "sphere") | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| //The launch latitude | |
| var start = 30; | |
| //The launch direction | |
| var degree = 60; | |
| //The degree as a percentage from vertical | |
| var degPerc = Math.abs(degree) / 90; | |
| //Whether the launch is oriented North or South | |
| var direction = (degree >= 0) ? 1 : -1; | |
| //The latitude encountered after a quarter orbit | |
| var mid = (start + ((90-start) * 2 * degPerc)) * degPerc * direction; | |
| console.log(mid, degPerc, direction); | |
| //Draw the orbital path | |
| svg.append("path") | |
| .datum({type: "LineString", coordinates: [[-180, -start], [-90, -mid], [0, start], [90, mid], [180, -start]]}) | |
| .attr("class", "orbit") | |
| .attr("d", path); | |
| //Draw the equator | |
| svg.append("path") | |
| .datum({type: "LineString", coordinates: [[-180, 0], [-90, 0], [0, 0], [90, 0], [180, 0]]}) | |
| .attr("class", "equator") | |
| .attr("d", path); | |
| //Draw the longitude line of the starting point | |
| svg.append("path") | |
| .datum({type: "LineString", coordinates: [[0, -90], [0, 0], [0, 90]]}) | |
| .attr("class", "equator") | |
| .attr("d", path); | |
| //Draw the starting point | |
| svg.append("path") | |
| .datum({type: "MultiPoint", coordinates: [[0, start]]}) | |
| .attr("class", "start") | |
| .attr("d", path); | |
| var feature = svg.selectAll("path"); | |
| animation(); | |
| function animation() { | |
| svg.transition() | |
| .duration(7500) | |
| .tween("projection", function() { | |
| return function(_) { | |
| projection.alpha(_); | |
| feature.attr("d", path); | |
| }; | |
| }) | |
| .transition() | |
| .duration(2500) | |
| //.each("end", animation); | |
| } | |
| function interpolatedProjection(a, b) { | |
| var projection = d3.geo.projection(raw).scale(1), | |
| center = projection.center, | |
| translate = projection.translate, | |
| α; | |
| function raw(λ, φ) { | |
| var pa = a([λ *= 180 / Math.PI, φ *= 180 / Math.PI]), pb = b([λ, φ]); | |
| return [(1 - α) * pa[0] + α * pb[0], (α - 1) * pa[1] - α * pb[1]]; | |
| } | |
| projection.alpha = function(_) { | |
| if (!arguments.length) return α; | |
| α = +_; | |
| var ca = a.center(), cb = b.center(), | |
| ta = a.translate(), tb = b.translate(); | |
| center([(1 - α) * ca[0] + α * cb[0], (1 - α) * ca[1] + α * cb[1]]); | |
| translate([(1 - α) * ta[0] + α * tb[0], (1 - α) * ta[1] + α * tb[1]]); | |
| return projection; | |
| }; | |
| delete projection.scale; | |
| delete projection.translate; | |
| delete projection.center; | |
| return projection.alpha(0); | |
| } | |
| </script> |
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