Added checking support for a pair of lat/lng numbers with slight touc…

…h on the README.
tparkin · Feb 23, 2013 · edddcbb · edddcbb
1 parent f1ed6ca
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diff --git a/README.md b/README.md
@@ -0,0 +1,21 @@
+Google-Maps-Point-in-Polygon
+------------------------
+
+A Javascript Google Maps v3 extension for the Polygon class to detect whether or not a point resides within it.
+
+Usage:
+------------------------
+- Check if a LatLng object resides within the polygon.
+```
+var coordinate = new google.maps.LatLng(40, -90);                                                                                                                                                                                                       
+var polygon = new google.maps.Polygon([], "#000000", 1, 1, "#336699", 0.3);
+var isWithinPolygon = polygon.containsLatLng(coordinate);
+```
+
+- Or, check if a pair of lat,lng resides within the polygon without creating a Marker object
+
+```
+var polygon = new google.maps.Polygon([], "#000000", 1, 1, "#336699", 0.3);
+var isWithinPolygon = polygon.containsLatLng(40, -90);
+```
+
diff --git a/maps.google.polygon.containsLatLng.js b/maps.google.polygon.containsLatLng.js
@@ -20,10 +20,25 @@ if (!google.maps.Polygon.prototype.getBounds) {
 // Polygon containsLatLng - method to determine if a latLng is within a polygon
 google.maps.Polygon.prototype.containsLatLng = function(latLng) {
   // Exclude points outside of bounds as there is no way they are in the poly
-  var bounds = this.getBounds();
+
+  var lat, lng;
 
-  if(bounds != null && !bounds.contains(latLng)) {
-    return false;
+  //arguments are a pair of lat, lng variables
+  if(arguments.length == 2) {
+    if(typeof arguments[0]=="number" && typeof arguments[1]=="number") {
+      lat = arguments[0];
+      lng = arguments[1];
+    }
+  } else if (arguments.length == 1) {
+    var bounds = this.getBounds();
+
+    if(bounds != null && !bounds.contains(latLng)) {
+      return false;
+    }
+    lat = latLng.lat();
+    lng = latLng.lng();
+  } else {
+    console.log("Wrong number of inputs in google.maps.Polygon.prototype.contains.LatLng");
   }
 
   // Raycast point in polygon method
@@ -39,8 +54,8 @@ google.maps.Polygon.prototype.containsLatLng = function(latLng) {
       var vertex1 = path.getAt(i);
       var vertex2 = path.getAt(j);
 
-      if (vertex1.lng() < latLng.lng() && vertex2.lng() >= latLng.lng() || vertex2.lng() < latLng.lng() && vertex1.lng() >= latLng.lng())  {
-        if (vertex1.lat() + (latLng.lng() - vertex1.lng()) / (vertex2.lng() - vertex1.lng()) * (vertex2.lat() - vertex1.lat()) < latLng.lat()) {
+      if (vertex1.lng() < lng && vertex2.lng() >= lng || vertex2.lng() < lng && vertex1.lng() >= lng) {
+        if (vertex1.lat() + (lng - vertex1.lng()) / (vertex2.lng() - vertex1.lng()) * (vertex2.lat() - vertex1.lat()) < lat) {
           inPoly = !inPoly;
         }
       }