Added map to Building/Index

public/assets/js/geo/geo.js

@@ -0,0 +1,90 @@
+function rad2degr(rad) { return rad * 180 / Math.PI; }
+function degr2rad(degr) { return degr * Math.PI / 180; }
+
+/**
+ * @param latLngInDeg array of arrays with latitude and longtitude
+ *   pairs in degrees. e.g. [[latitude1, longtitude1], [latitude2
+ *   [longtitude2] ...]
+ *
+ * @return array with the center latitude longtitude pairs in 
+ *   degrees.
+ */
+function getLatLngCenter(latLngInDegr) {
+    var LATIDX = 0;
+    var LNGIDX = 1;
+    var sumX = 0;
+    var sumY = 0;
+    var sumZ = 0;
+
+    for (var i=0; i<latLngInDegr.length; i++) {
+        var lat = degr2rad(latLngInDegr[i][LATIDX]);
+        var lng = degr2rad(latLngInDegr[i][LNGIDX]);
+        // sum of cartesian coordinates
+        sumX += Math.cos(lat) * Math.cos(lng);
+        sumY += Math.cos(lat) * Math.sin(lng);
+        sumZ += Math.sin(lat);
+    }
+
+    var avgX = sumX / latLngInDegr.length;
+    var avgY = sumY / latLngInDegr.length;
+    var avgZ = sumZ / latLngInDegr.length;
+
+    // convert average x, y, z coordinate to latitude and longtitude
+    var lng = Math.atan2(avgY, avgX);
+    var hyp = Math.sqrt(avgX * avgX + avgY * avgY);
+    var lat = Math.atan2(avgZ, hyp);
+
+    return ([rad2degr(lat), rad2degr(lng)]);
+}
+
+/**
+ * Get a center latitude,longitude from an array of like geopoints
+ *
+ * @param array data 2 dimensional array of latitudes and longitudes
+ * For Example:
+ * $data = array
+ * (
+ *   0 = > array(45.849382, 76.322333),
+ *   1 = > array(45.843543, 75.324143),
+ *   2 = > array(45.765744, 76.543223),
+ *   3 = > array(45.784234, 74.542335)
+ * );
+*/
+function GetCenterFromDegrees(data)
+{       
+    if (!(data.length > 0)){
+        return false;
+    } 
+
+    var num_coords = data.length;
+
+    var X = 0.0;
+    var Y = 0.0;
+    var Z = 0.0;
+
+    for(i = 0; i < data.length; i++){
+        var lat = data[i][0] * Math.PI / 180;
+        var lon = data[i][1] * Math.PI / 180;
+
+        var a = Math.cos(lat) * Math.cos(lon);
+        var b = Math.cos(lat) * Math.sin(lon);
+        var c = Math.sin(lat);
+
+        X += a;
+        Y += b;
+        Z += c;
+    }
+
+    X /= num_coords;
+    Y /= num_coords;
+    Z /= num_coords;
+
+    var lon = Math.atan2(Y, X);
+    var hyp = Math.sqrt(X * X + Y * Y);
+    var lat = Math.atan2(Z, hyp);
+
+    var newX = (lat * 180 / Math.PI);
+    var newY = (lon * 180 / Math.PI);
+
+    return new Array(newX, newY);
+}