forked from vonkow/astrolabe
/
index.html
208 lines (206 loc) · 6.36 KB
/
index.html
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<html>
<head>
</head>
<body>
<canvas id="astrolabe" width=500 height=500></canvas>
<script>
var cPos = {
sun:[[138,29,9]],
mon:[[198,20,47]],
mer:[[153,0.1]],
ven:[[118,55.8],true],
mar:[[159,55.5]],
jup:[[263,35.8],true],
sat:[[102,35.3]]
}
var nPos = {
sun:[[139,29,29]],
mon:[[210,44,30]],
mer:[[154,29.1]],
ven:[[118,37.7],true],
mar:[[160,39.4]],
jup:[[263,34.3],true],
sat:[[102,41.8]]
}
//var ascArr = [
//[0,[
//0,55,110,165,220,275,330,386,441,496,551,607,662,718,773
//]]
//]
Date.prototype.stdTimezoneOffset = function() {
var jan = new Date(this.getFullYear(), 0, 1);
var jul = new Date(this.getFullYear(), 6, 1);
return Math.max(jan.getTimezoneOffset(), jul.getTimezoneOffset());
}
Date.prototype.dst = function() {
return this.getTimezoneOffset() < this.stdTimezoneOffset();
}
// create current time
var lat = 0;//42.36;
var lon = 0;//-71.1;
function setLatLon(pos) {
lat = pos.coords.latitude;
lon = pos.coords.longitude;
}
function handleErr(err) {
alert(err.code);
}
navigator.geolocation.getCurrentPosition(setLatLon,handleErr);
function calcAsc() {
var curT = new Date();
var curSec = (curT.getHours()*3600)+(curT.getMinutes()*60)+curT.getSeconds();
var gmtSec = curSec+(curT.stdTimezoneOffset()*60);
var locSec = gmtSec+(Math.round(lon)*4*60);
//now calc star time using local time and longitude
// yesterday's sidereal time 3:16.12
// today's sidereal time 3:20.8
var sidT1 = (((3*60)+20)*60)+8;
// Add 10 sec for every 15 deg lon west (sub east)
var sidT2 = sidT1+Math.round((-lon/15)*10);
// Add Local Time
var sidT3 = sidT2+locSec;
// Add 10 seconds for ever hour of local time
var sidT = sidT3+Math.round(((locSec/60)/60)*10);
// Subtract 24 hours for true local sidereal time, if needed
if (sidT>(24*60*60)) sidT-=(24*60*60);
// Get degrees to rotate,(assuming equator, even houses)
var curDeg = (sidT/60)/4;
var degs = {
sid:curDeg
};
var planets = ['sun','mon','mer','ven','mar','jup','sat'];
for (var y=0; y<planets.length; y++) {
var s1 = (((cPos[planets[y]][0][0]*60)+cPos[planets[y]][0][1])*60);
if (cPos[planets[y]][0][2]) s1+=cPos[planets[y]][0][2];
var s2 = (((nPos[planets[y]][0][0]*60)+nPos[planets[y]][0][1])*60);
if (nPos[planets[y]][0][2]) s2+=nPos[planets[y]][0][2];
var f = ((gmtSec/60)/60)/24;
var d = s2-s1; //Add logic to reverse this if retrograde
var p = d*f;
var s = s1+p;
degs[planets[y]]= (s/60)/60;
}
return degs;
}
// Here's the rendering stuff
function loadSprites(imgs, callback) {
function loadNext(arr) {
if (arr.length) {
var i = arr.pop();
var img = new Image();
img.onload = function() {
sprites[i[0]] = [this, i[2], i[3]];
loadNext(arr);
};
img.onerror = function() { loadNext(arr) };
img.src = i[1];
} else {
callback();
};
};
var x,
arr = [];
for (x in imgs) {
var i = imgs[x];
arr.push([x, i[0], i[1], i[2]]);
};
loadNext(arr);
};
function toRads(deg) { return (Math.PI/180)*deg};
function radLine(a,p1,p2,deg) {
var theta = toRads(deg);
var x = Math.sin(theta);
var y = Math.cos(theta);
a.beginPath();
a.moveTo(250+(p1*x), 250+(p1*y));
a.lineTo(250+(p2*x), 250+(p2*y));
a.closePath();
a.stroke();
}
function makeCirc(a,x,y,rad) {
a.beginPath();
a.arc(x,y,rad,0,toRads(360));
a.stroke();
}
function makeDegs(a,o) {
for (var d=0; d<360; d++) {
if (d%30==0) {
radLine(a,200,250,d+o);
} else if (d%5==0) {
radLine(a,200,212.5,d+o);
} else {
radLine(a,200,206.25,d+o);
}
}
}
function makeHouses(a) {
for (var d=0;d<360; d+=30) {
radLine(a,100,200,d);
}
}
function drawImg(a,img,pdis,pdeg,ox,oy) {
var theta = toRads(pdeg);
var x = Math.sin(theta);
var y = Math.cos(theta);
a.drawImage(img,250+ox+(pdis*x),250+oy+(pdis*y));
}
function makeSigns(a,o) {
var signs = ['ares','taurus','gemini','cancer','leo','virgo','libra','scorpio','sagittarius','capricorn','aquarius','pisces'];
var signCount = -1;
for (var p=15;p<375;p+=30) {
drawImg(a, sprites[signs[++signCount]][0], 231, p+o, -15, -15);
}
}
function drawChart() {
var a = document.getElementById('astrolabe').getContext('2d');
var degs = calcAsc();
a.clearRect(0,0,500,500);
makeCirc(a,250,250,250);
makeCirc(a,250,250,212.5);
makeCirc(a,250,250,200);
makeCirc(a,250,250,100);
makeHouses(a);
makeDegs(a,270-degs.sid);
makeSigns(a,270-degs.sid);
drawImg(a,sprites['sun'][0],175,degs.sun-degs.sid,-15,-15);
radLine(a,195,200,degs.sun-degs.sid);
drawImg(a,sprites['moon'][0],175,degs.mon-degs.sid,-15,-15);
radLine(a,195,200,degs.mon-degs.sid);
drawImg(a,sprites['mercury'][0],175,degs.mer-degs.sid,-15,-15);
radLine(a,195,200,degs.mer-degs.sid);
drawImg(a,sprites['venus'][0],175,degs.ven-degs.sid,-15,-15);
radLine(a,195,200,degs.ven-degs.sid);
drawImg(a,sprites['mars'][0],175,degs.mar-degs.sid,-15,-15);
radLine(a,195,200,degs.mar-degs.sid);
drawImg(a,sprites['jupiter'][0],175,degs.jup-degs.sid,-15,-15);
radLine(a,195,200,degs.jup-degs.sid);
drawImg(a,sprites['saturn'][0],175,degs.sat-degs.sid,-15,-15);
radLine(a,195,200,degs.sat-degs.sid);
}
var sprites = {};
loadSprites({
ares: ['sprites/ares.png',30,30],
taurus: ['sprites/taurus.png',30,30],
gemini: ['sprites/gemini.png',30,30],
cancer: ['sprites/cancer.png',30,30],
leo: ['sprites/leo.png',30,30],
virgo: ['sprites/virgo.png',30,30],
libra: ['sprites/libra.png',30,30],
scorpio: ['sprites/scorpio.png',30,30],
sagittarius: ['sprites/sagittarius.png',30,30],
capricorn: ['sprites/capricorn.png',30,30],
aquarius: ['sprites/aquarius.png',30,30],
pisces: ['sprites/pisces.png',30,30],
sun: ['sprites/sun.png',30,30],
moon: ['sprites/moon.png',30,30],
mercury: ['sprites/mercury.png',30,30],
venus: ['sprites/venus.png',30,30],
mars: ['sprites/mars.png',30,30],
jupiter: ['sprites/jupiter.png',30,30],
saturn: ['sprites/saturn.png',30,30]
}, function() {
var i = window.setInterval(drawChart, 1000);
})
</script>
</body>
</html>