modify how to load the constellations

apps.json

@@ -2720,6 +2720,7 @@
   "storage": [
     {"name":"planetarium.app.js","url":"planetarium.app.js"},
     {"name":"planetarium.data.csv","url":"planetarium.data.csv"},
+    {"name":"planetarium.const.csv","url":"planetarium.const.csv"},
     {"name":"planetarium.settings.js","url":"settings.js"},
     {"name":"planetarium.img","url":"planetarium-icon.js","evaluate":true}
   ],

apps/planetarium/planetarium.app.js

@@ -35,14 +35,56 @@ function siderealTime(julianDay)
     return toRadians(280.46061837 + 360.98564736629 * (julianDay - 2451545.0) + 0.000387933 * T * T - T * T * T / 38710000);
 }
 
-function drawStars(lat,lon,date){
+/*
+* Draws a single star in the sky. 
+* starPositions is a dictionary that gets modified and it is used later for ploting the constelations
+*/
+function drawStar(zeta,theta,z,julianDay,latitude,longitude,starDE,starRA,starMag,starNumber,starPositions){
+  var dec = Math.asin(Math.sin(theta) * Math.cos(starDE) * Math.cos(starRA + zeta) + Math.cos(theta) * Math.sin(starDE));
+  var ascen = Math.atan2(Math.cos(starDE) * Math.sin(starRA + zeta), Math.cos(theta) * Math.cos(starDE) * Math.cos(starRA + zeta) - Math.sin(theta) * Math.sin(starDE)) + z;
+  var H = siderealTime(julianDay) - longitude - ascen;
+  //Compute altitude
+  var alt = Math.asin(Math.sin(latitude) * Math.sin(dec) + Math.cos(latitude) * Math.cos(dec) * Math.cos(H));
+  if(alt >= 0)
+  {
+    //Compute azimuth  
+    var azi = Math.atan2(Math.sin(H), Math.cos(H) * Math.sin(latitude) - Math.tan(dec) * Math.cos(latitude));
+    var x = size / 2 + size / 2 * Math.cos(alt) * Math.sin(azi);
+    var y = size / 2 + size / 2 * Math.cos(alt) * Math.cos(azi);
+    starPositions[starNumber] = [x,y];
+    var magnitude = starMag<1?2:1;
+    //Stars between 1.5 and 4 magnitude should get a different colour
+    var col=1;
+    if (starMag<=1.5)
+      col=1;
+    else if (starMag>1.5 && starMag<2)
+      col=0.9;
+    else if (starMag>=2 && starMag<3)
+      col=0.7;
+    else if (starMag>=3 && starMag<3.5)
+      col=0.5;
+    else
+      col=0.3;
+
+    g.setColor(col,col,col);
+    g.fillCircle(x, y, magnitude);
+    if (starMag<1 && settings.starnames)
+      g.drawString(starInfo[3],x,y+2);
+    g.flip();
+
+  }
+}
+
+
+
+function plotSky(lat,lon,date){
   var longitude = toRadians(-lon);
   var latitude = toRadians(lat);
 
   var julianDay = toJulianDay(date.getFullYear(), date.getMonth()+1,date.getDate(),
                               date.getHours() + date.getTimezoneOffset() / 60,
                               date.getMinutes(), date.getSeconds());
-  var size = 240;
+  
 
   storage = require('Storage');
   f=storage.read("planetarium.data.csv","r");
@@ -63,64 +105,40 @@ function drawStars(lat,lon,date){
   while (lineend>=0) {
     line = f.substring(linestart,lineend);
     starNumber++;
-    //console.log(line);
     //Process the star
     starInfo = line.split(',');
     //console.log(starInfo[0]);
     starRA = parseFloat(starInfo[0]);
     starDE = parseFloat(starInfo[1]);
     starMag = parseFloat(starInfo[2]);
-    //var start = new Date().getTime();
-    var dec = Math.asin(Math.sin(theta) * Math.cos(starDE) * Math.cos(starRA + zeta) + Math.cos(theta) * Math.sin(starDE));
-    var ascen = Math.atan2(Math.cos(starDE) * Math.sin(starRA + zeta), Math.cos(theta) * Math.cos(starDE) * Math.cos(starRA + zeta) - Math.sin(theta) * Math.sin(starDE)) + z;
-    var H = siderealTime(julianDay) - longitude - ascen;
-    //Compute altitude
-    var alt = Math.asin(Math.sin(latitude) * Math.sin(dec) + Math.cos(latitude) * Math.cos(dec) * Math.cos(H));
-    if(alt >= 0)
-    {
-      //Compute azimuth  
-      var azi = Math.atan2(Math.sin(H), Math.cos(H) * Math.sin(latitude) - Math.tan(dec) * Math.cos(latitude));
-      var x = size / 2 + size / 2 * Math.cos(alt) * Math.sin(azi);
-      var y = size / 2 + size / 2 * Math.cos(alt) * Math.cos(azi);
-      starPositions[starNumber] = [x,y];
-      var magnitude = starMag<1?2:1;
-      //Stars between 1.5 and 4 magnitude should get a different colour
-      var col=1;
-      if (starMag<=1.5)
-        col=1;
-      else if (starMag>1.5 && starMag<2)
-        col=0.9;
-      else if (starMag>=2 && starMag<3)
-        col=0.7;
-      else if (starMag>=3 && starMag<3.5)
-        col=0.5;
-      else
-        col=0.3;
-        
-      g.setColor(col,col,col);
-      g.fillCircle(x, y, magnitude);
-      if (starMag<1 && settings.starnames)
-        g.drawString(starInfo[3],x,y+2);
-      g.flip();
-
-    }
+    drawStar(zeta,theta,z,julianDay,latitude,longitude,starDE,starRA,starMag,starNumber,starPositions);
     linestart = lineend+1;
     lineend = f.indexOf("\n",linestart);
   }
   
 
   if (settings.constellations){
-    //Each star has a number (the position on the file (line number)). These are the lines
-    //joining each star in the constellations.
-    constelations=[[[7,68],[10,53],[53,56],[28,68],"Orion"],[[13,172],[13,340],[293,340],[29,293],"Taurus"],
-                      [[155,8],"Canis Menor"],[[36,81],[87,81],[235,87],[33,235],[33,75],[75,40],[36,235],"Ursa Major"],[[67,91],[74,67],[91,110],[110,252],"Cassiopeia"],[[23,166],[16,294],[294,44],[166,149],[230,149],[16,23],"Gemini"],[[88,218],[215,292],[218,292],[245,88],[292,245],[215,218],"Cepheus"],[[150,62],[150,175],[175,35],[403,62],[487,158],[384,487],[384,158],[35,158],[487,403],"Perseus"],[[19,65],[65,90],[65,147],[466,65],[466,189],[147,401],[213,90],"Cygnus"],[[6,42],[168,6],[168,113],[113,29],[104,29],[104,42],"Auriga"],[[1,47],[1,37],[37,22],[22,178],[37,89],"Can Maior"],[[3,118],[118,279],[279,286],[286,180],[180,316],[316,3],"Bootes"]];
-    g.setColor(0,255,0);
-    for (i=0;i<constelations.length;i++)
-    {
+    linenum=linestart = 0;
+    fc=storage.read("planetarium.const.csv","r");
+    lineend = fc.indexOf("\n");
+    while (lineend>=0) {
+      linenum++;
+      //In this file, each constelation are two lines. The first one the name, the second the lines joining stars
+      var name = fc.substring(linestart,lineend);
+      linestart = lineend+1;
+      lineend = fc.indexOf("\n",linestart);
+      var lines = fc.substring(linestart,lineend).split(',');
+      linestart = lineend+1;
+      lineend = fc.indexOf("\n",linestart);
+      g.setColor(0,255,0);
+      if (linenum>11)
+        break;
       constelationShowing=false;
-      for (j=0;j<constelations[i].length-1;j++){
-        positionStar1=starPositions[constelations[i][j][0]];
-        positionStar2=starPositions[constelations[i][j][1]];
+      
+      for (j=0;j<lines.length;j++){
+        positions = lines[j].split(' ');
+        positionStar1=starPositions[parseInt(positions[0])];
+        positionStar2=starPositions[parseInt(positions[1])];
         //Both stars need to be visible
         if (positionStar1 && positionStar2)
         {
@@ -132,12 +150,14 @@ function drawStars(lat,lon,date){
         g.flip();
       }
       //Write the name
-      if (constelationShowing && settings.consnames)
-        g.drawString(constelations[i][constelations[i].length-1],positionStar2[0]+10,positionStar2[1]);
+      if (constelationShowing && true)
+        g.drawString(name,positionStar2[0]+10,positionStar2[1]);
     }
   }
 }
 
+const size = 240; //Bangle size screen
+
 Bangle.setGPSPower(1);
 
 var gps = { fix : 0};
@@ -157,7 +177,7 @@ Bangle.on('GPS',function(gp) {
     lon = gp.lon;
     Bangle.setGPSPower(0);
     setTimeout(function() {
-      drawStars(lat,lon,new Date());},0);
+      plotSky(lat,lon,new Date());},0);
   } else {
     g.setFont("Vector",20); 
     g.drawString("Waiting for position",120,120);

apps/planetarium/planetarium.const.csv

@@ -0,0 +1,24 @@
+Orion
+7 68,10 53,53 56,28 68
+Taurus
+13 172,13 340,293 340,29 293
+Canis Menor
+155 8
+Ursa Major
+36 81,87 81,235 87,33 235,33 75,75 40,36 235
+Cassiopeia
+67 91,74 67,91 110,110 252
+Gemini
+23 166,16 294,294,44,166 149,230 149,16 23
+Cepheus
+88 218,215 292,218 292,245 88,292 245,215 218
+Perseus
+150 62,150 175,175 35,403 62,487 158,384 487,384 158,35 158,487 403
+Cygnus
+19 65,65 90,65 147,466 65,466 189,147 401,213 90
+Auriga
+6 42,168 6,168 113,113 29,104 29,104 42
+Can Maior
+1 47,1 37,37 22,22 178,37 89
+Bootes
+3 118,118 279,279 286,286 180,180 316,316 3