[Station Locations] Start of adding automatic gridsquare population

application/views/interface_assets/footer.php

@@ -56,7 +56,29 @@ function load_was_map() {
 <script type="text/javascript" src="<?php echo base_url();?>assets/js/selectize.js"></script>
 
 <?php if ($this->uri->segment(1) == "station") { ?>
+    <script language="javascript" src="<?php echo base_url() ;?>assets/js/HamGridSquare.js"></script>
     <script src="<?php echo base_url() ;?>assets/js/sections/station_locations.js"></script>
+    <script>
+        var x = document.getElementById("demo");
+        var position;
+        function getLocation() {
+            console.log("'clicked");
+            if (navigator.geolocation) {
+                navigator.geolocation.getCurrentPosition(showPosition);
+                console.log("'got position");
+            } else { 
+                x.innerHTML = "Geolocation is not supported by this browser.";
+            }
+        }
+
+        function showPosition(position) {
+            console.log("'got position");
+  x.innerHTML = "Latitude: " + position.coords.latitude + 
+  "<br>Longitude: " + position.coords.longitude;
+  console.log(position);
+  console.log(latLonToGridSquare(position.coords.latitude,position.coords.longitude));
+  }
+    </script>
 <?php } ?>
 
 <?php if ($this->uri->segment(1) == "logbooks") { ?>

application/views/station_profile/create.php

@@ -161,6 +161,8 @@
 		    <input type="text" class="form-control" name="gridsquare" id="stationGridsquareInput" aria-describedby="stationGridInputHelp" required>
 		    <small id="stationGridInputHelp" class="form-text text-muted">Station grid square. For example: IO87IP</small>
 		    <small id="stationGridInputHelp" class="form-text text-muted">If you are located on a grid line, enter multiple grid squares separated with commas. For example: IO77,IO78,IO87,IO88.</small>
+
+			<button onclick="getLocation()">Find Gridsquare</button>
 		  </div>
 
             <div class="form-group">

assets/js/HamGridSquare.js

@@ -0,0 +1,127 @@
+// HamGridSquare.js
+// Copyright 2014 Paul Brewer KI6CQ
+// License:  MIT License http://opensource.org/licenses/MIT
+//
+// Javascript routines to convert from lat-lon to Maidenhead Grid Squares
+// typically used in Ham Radio Satellite operations and VHF Contests
+//
+// Inspired in part by K6WRU Walter Underwood's python answer
+// http://ham.stackexchange.com/a/244
+// to this stack overflow question:
+// How Can One Convert From Lat/Long to Grid Square
+// http://ham.stackexchange.com/questions/221/how-can-one-convert-from-lat-long-to-grid-square
+//
+
+latLonToGridSquare = function(param1,param2){
+  var lat=-100.0;
+  var lon=0.0;
+  var adjLat,adjLon,GLat,GLon,nLat,nLon,gLat,gLon,rLat,rLon;
+  var U = 'ABCDEFGHIJKLMNOPQRSTUVWX'
+  var L = U.toLowerCase();
+  // support Chris Veness 2002-2012 LatLon library and
+  // other objects with lat/lon properties
+  // properties could be numbers, or strings
+  function toNum(x){
+    if (typeof(x) === 'number') return x;
+    if (typeof(x) === 'string') return parseFloat(x);
+    // dont call a function property here because of binding issue
+    throw "HamGridSquare -- toNum -- can not convert input: "+x;
+  }
+  if (typeof(param1)==='object'){
+    if (param1.length === 2){
+      lat = toNum(param1[0]);
+      lon = toNum(param1[1]);
+    } else if (('lat' in param1) && ('lon' in param1)){
+      lat = (typeof(param1.lat)==='function')? toNum(param1.lat()): toNum(param1.lat);
+      lon = (typeof(param1.lon)==='function')? toNum(param1.lon()): toNum(param1.lon);
+    } else if (('latitude' in param1) && ('longitude' in param1)){
+      lat = (typeof(param1.latitude)==='function')? toNum(param1.latitude()): toNum(param1.latitude);
+      lon = (typeof(param1.longitude)==='function')? toNum(param1.longitude()): toNum(param1.longitude);
+    } else {
+      throw "HamGridSquare -- can not convert object -- "+param1;
+    }
+  } else {
+    lat = toNum(param1);
+    lon = toNum(param2);
+  }
+  if (isNaN(lat)) throw "lat is NaN";
+  if (isNaN(lon)) throw "lon is NaN";
+  if (Math.abs(lat) === 90.0) throw "grid squares invalid at N/S poles";
+  if (Math.abs(lat) > 90) throw "invalid latitude: "+lat;
+  if (Math.abs(lon) > 180) throw "invalid longitude: "+lon;
+  adjLat = lat + 90;
+  adjLon = lon + 180;
+  GLat = U[Math.trunc(adjLat/10)];
+  GLon = U[Math.trunc(adjLon/20)];
+  nLat = ''+Math.trunc(adjLat % 10);
+  nLon = ''+Math.trunc((adjLon/2) % 10);
+  rLat = (adjLat - Math.trunc(adjLat)) * 60;
+  rLon = (adjLon - 2*Math.trunc(adjLon/2)) *60;
+  gLat = L[Math.trunc(rLat/2.5)];
+  gLon = L[Math.trunc(rLon/5)];
+  return GLon+GLat+nLon+nLat+gLon+gLat;
+}
+
+gridSquareToLatLon = function(grid, obj){
+  var returnLatLonConstructor = (typeof(LatLon)==='function');
+  var returnObj = (typeof(obj)==='object');
+  var lat=0.0,lon=0.0,aNum="a".charCodeAt(0),numA="A".charCodeAt(0);
+  function lat4(g){
+    return 10*(g.charCodeAt(1)-numA)+parseInt(g.charAt(3))-90;
+  }
+  function lon4(g){
+    return 20*(g.charCodeAt(0)-numA)+2*parseInt(g.charAt(2))-180;
+  }
+  if ((grid.length!=4) && (grid.length!=6)) throw "gridSquareToLatLon: grid must be 4 or 6 chars: "+grid;
+  if (/^[A-X][A-X][0-9][0-9]$/.test(grid)){
+    lat = lat4(grid)+0.5;
+    lon = lon4(grid)+1;
+  } else if (/^[A-X][A-X][0-9][0-9][a-x][a-x]$/.test(grid)){
+    lat = lat4(grid)+(1.0/60.0)*2.5*(grid.charCodeAt(5)-aNum+0.5);
+    lon = lon4(grid)+(1.0/60.0)*5*(grid.charCodeAt(4)-aNum+0.5);
+  } else throw "gridSquareToLatLon: invalid grid: "+grid;
+  if (returnLatLonConstructor) return new LatLon(lat,lon);
+  if (returnObj){
+    obj.lat = lat;
+    obj.lon = lon;
+    return obj;
+  }
+  return [lat,lon];
+};
+
+testGridSquare = function(){
+  // First four test examples are from "Conversion Between Geodetic and Grid Locator Systems",
+  // by Edmund T. Tyson N5JTY QST January 1989
+  // original test data in Python / citations by Walter Underwood K6WRU
+  // last test and coding into Javascript from Python by Paul Brewer KI6CQ
+  var testData = [
+    ['Munich', [48.14666,11.60833], 'JN58td'],
+    ['Montevideo', [[-34.91,-56.21166]], 'GF15vc'],
+    ['Washington, DC', [{lat:38.92,lon:-77.065}], 'FM18lw'],
+    ['Wellington', [{latitude:-41.28333,longitude:174.745}], 'RE78ir'],
+    ['Newington, CT (W1AW)', [41.714775,-72.727260], 'FN31pr'],
+    ['Palo Alto (K6WRU)', [[37.413708,-122.1073236]], 'CM87wj'],
+    ['Chattanooga (KI6CQ/4)', [{lat:function(){ return "35.0542"; }, 
+                              lon: function(){ return "-85.1142"}}], "EM75kb"]
+  ];
+  var i=0,l=testData.length,result='',result2,result3,thisPassed=0,totalPassed=0;
+  for(i=0;i<l;++i){
+    result = latLonToGridSquare.apply({}, testData[i][1]);
+    result2 = gridSquareToLatLon(result);
+    result3 = latLonToGridSquare(result2);
+    thisPassed = (result===testData[i][2]) && (result3===testData[i][2]);
+    console.log("test "+i+": "+testData[i][0]+" "+JSON.stringify(testData[i][1])+
+                " result = "+result+" result2 = "+result2+" result3 = "+result3+" expected= "+testData[i][2]+
+                " passed = "+thisPassed);
+    totalPassed += thisPassed;
+  }
+  console.log(totalPassed+" of "+l+" test passed");
+  return totalPassed===l;
+};
+
+HamGridSquare = {
+  toLatLon: gridSquareToLatLon,
+  fromLatLon: latLonToGridSquare,
+  test: testGridSquare
+};
+