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<html> | |
<head> | |
<meta charset="utf-8"> | |
<link href="stars.css" rel="stylesheet"> | |
</head> | |
<body> | |
<h1></h1> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="stars.js"></script> | |
</body> | |
</html> |
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body { | |
background: #113; | |
} | |
h1 { | |
position: absolute; | |
top: 280px; | |
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
font-size: 18px; | |
text-align: center; | |
width: 960px; | |
color: #fff; | |
} | |
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var width = 960, | |
height = 500; | |
var projection = d3.geo.stereographic() | |
.scale(600) | |
var canvas = d3.select("body").append("canvas") | |
.attr("width", width) | |
.attr("height", height) | |
var c = canvas.node().getContext("2d") | |
function getRetinaRatio() { | |
var devicePixelRatio = window.devicePixelRatio || 1 | |
var backingStoreRatio = c.webkitBackingStorePixelRatio || | |
c.mozBackingStorePixelRatio || | |
c.msBackingStorePixelRatio || | |
c.oBackingStorePixelRatio || | |
c.backingStorePixelRatio || 1 | |
return devicePixelRatio / backingStoreRatio | |
} | |
var ratio = getRetinaRatio() | |
var scaledWidth = width * ratio | |
var scaledHeight = height * ratio | |
canvas.node().width = scaledWidth | |
canvas.node().height = scaledHeight | |
canvas | |
.style("width", width + 'px') | |
.style("height", height + 'px') | |
c.scale(ratio, ratio) | |
var path = d3.geo.path() | |
.projection(projection) | |
.context(c) | |
var graticule = d3.geo.graticule() | |
.step([15, 15]) | |
var title = d3.select("h1") | |
var bgRGB = d3.rgb('#113') | |
d3.json("/erohinaelena/raw/ec635d68e8bf55586d40/starData.json", function(error, data) { | |
var geoConstellations = [] | |
var starsMag = [] | |
data = data.map(function(constellation){ | |
constellation.stars = constellation.stars.filter(function(star){ | |
if (star.mag < 6) starsMag.push(star.mag) | |
return star.mag < 6 | |
}) | |
return constellation | |
}) | |
var minMaxMag = d3.extent(starsMag) | |
var opacityScale = d3.scale.linear() | |
.domain(minMaxMag) | |
.range([1, 0.4]) | |
console.log(d3.extent(starsMag)) | |
var magScale = d3.scale.linear() | |
.domain(minMaxMag) | |
.range([2.7, 1.7]) | |
data.forEach(function (constellation) { | |
var geometries = [] | |
constellation.stars.map(function (star) { | |
var rgb = d3.rgb(star.color) | |
var rgba = 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + opacityScale(star.mag) + ')' | |
geometries.push({ | |
type: 'Point', | |
coordinates: [-star.ra, star.dec], | |
properties: { | |
color: rgba, | |
mag: magScale(star.mag) | |
} | |
}) | |
}) | |
var lines = constellation.lines.map(function (line) { | |
var p1 = [-line.ra1, line.dec1] | |
var p2 = [-line.ra2, line.dec2] | |
return [p1, p2] | |
}) | |
geometries.push({ | |
type: "MultiLineString", | |
coordinates: lines | |
}) | |
if (constellation.name == 'Serpens'){ | |
var bound1 = constellation.boundary[0].map(function (coords) { | |
return [-coords[0], coords[1]] | |
}) | |
var bound2 = constellation.boundary[1].map(function (coords) { | |
return [-coords[0], coords[1]] | |
}) | |
geometries.push({ | |
type: "LineString", | |
coordinates: bound1 | |
}) | |
geometries.push({ | |
type: "LineString", | |
coordinates: bound2 | |
}) | |
} else { | |
var boundLines = constellation.boundary.map(function (coords) { | |
return [-coords[0], coords[1]] | |
}) | |
geometries.push({ | |
type: "LineString", | |
coordinates: boundLines | |
}) | |
} | |
geoConstellations.push({ | |
type: 'Feature', | |
geometry: { | |
type: 'GeometryCollection', | |
geometries: geometries | |
}, | |
properties: { | |
name: constellation.name, | |
zodiac: constellation.zodiac | |
} | |
} | |
) | |
}) | |
ready(geoConstellations) | |
}) | |
function makeRadialGradient(x, y, r, color) { | |
var radialgradient = c.createRadialGradient(x, y, 0, x, y, r) | |
radialgradient.addColorStop(0.2, color) | |
radialgradient.addColorStop(0.5,'rgba(' + bgRGB.r + ',' +bgRGB.g + ',' + bgRGB.b + ',0)') | |
radialgradient.addColorStop(0.5,'rgba(' + bgRGB.r + ',' +bgRGB.g + ',' + bgRGB.b + ',1)') | |
radialgradient.addColorStop(1,'rgba(' + bgRGB.r + ',' +bgRGB.g + ',' + bgRGB.b + ',0)') | |
c.fillStyle = radialgradient | |
} | |
function ready (constellations) { | |
var i = -1, | |
previousCenter = [0, 0], | |
n = constellations.length; | |
(function transition() { | |
d3.transition() | |
.duration(1250) | |
.each("start", function() { | |
title.text(constellations[i = (i + 1) % n].properties.name) | |
}) | |
.tween("rotate", function() { | |
var center = d3.geo.centroid(constellations[i]) | |
var raRotate = center[0] - previousCenter[0] | |
previousCenter = center | |
var rotate = projection.rotate() | |
var r = d3.interpolate(rotate, [-center[0], -center[1]]) | |
var r1 = d3.interpolate([rotate[0] - 360, rotate[1]], [-center[0], -center[1]]) | |
var r2 = d3.interpolate([rotate[0] + 360, rotate[1]], [-center[0], -center[1]]) | |
return function(t) { | |
var coordinates = r(t) | |
if (Math.abs(raRotate) > 180) coordinates = (raRotate > 0)? r1(t) : r2(t) | |
projection.rotate(coordinates) | |
c.clearRect(0, 0, width, height) | |
c.strokeStyle = "#fff" | |
c.lineWidth = .1 | |
c.beginPath(), path(graticule()), c.stroke() | |
c.lineWidth = .4 | |
c.beginPath(), path({type: "LineString", coordinates: [[-180, 0], [-90, 0], [0, 0], [90, 0], [180, 0]]}), c.stroke() | |
c.strokeStyle = "#f2f237" | |
c.beginPath(), path({type: "LineString", coordinates: [[-180, 0], [-90, 23.26], [0, 0], [90, -23.26], [180, 0]]}), c.stroke() | |
constellations.forEach(function(constellation){ | |
constellation.geometry.geometries.forEach(function(geo){ | |
if (geo.type == 'Point') { | |
makeRadialGradient( | |
projection(geo.coordinates)[0], | |
projection(geo.coordinates)[1], | |
geo.properties.mag, | |
geo.properties.color) | |
path.pointRadius([geo.properties.mag]) | |
c.beginPath(), path(geo), c.fill(); | |
} else if (geo.type == 'LineString'){ | |
c.strokeStyle = '#000' | |
c.beginPath(), path(geo),c.stroke() | |
} else if (geo.type == 'MultiLineString'){ | |
c.strokeStyle = (constellation.properties.zodiac)?'#f2f237':"#999" | |
c.beginPath(), path(geo), c.stroke(); | |
} | |
}) | |
}) | |
c.strokeStyle = "#f00" | |
c.lineWidth = 1.2 | |
constellations[i].geometry.geometries.forEach(function(geo){ | |
if (geo.type == 'LineString'){ | |
c.beginPath(), path(geo), c.stroke() | |
} | |
}) | |
}; | |
}) | |
.transition() | |
.each("end", transition) | |
})(); | |
} |
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