Replacing the previous answer, in case anybody else finds this like I did. As of boost 1.43, there are some commonly used range adaptors provided. In this case, you want boost::adaptors::map_values. The relevant example: http://www.boost.org/doc/libs/1_46_0/libs/range/doc/html/range/reference/adaptors/reference/map_values.html#range.reference.adaptors.reference.map_values.map_values_example
For a virtual earth application I’ve used the clustering described here. It’s lightning fast and easily extensible.
Follow the crib sheet very, very carefully: https://docs.google.com/document/pub?id=19nQzvKP-CVLd7_VrpwnHfl-AE9fjbJySowONZZtNHzw In particular, I think you need to: Import the actual source for the “google-play-services_lib” project and link it as an Android library. Do this through Project -> Properties -> Android -> Library, Add -> google-play-services_lib (you can right click on your project and choose Properties, then select … Read more
Try this solution using this example url: http://maps.google.com/maps/api/geocode/json?address=mumbai&sensor=false which returns data in json format with lat/lng of address. private class DataLongOperationAsynchTask extends AsyncTask<String, Void, String[]> { ProgressDialog dialog = new ProgressDialog(MainActivity.this); @Override protected void onPreExecute() { super.onPreExecute(); dialog.setMessage(“Please wait…”); dialog.setCanceledOnTouchOutside(false); dialog.show(); } @Override protected String[] doInBackground(String… params) { String response; try { response = getLatLongByURL(“http://maps.google.com/maps/api/geocode/json?address=mumbai&sensor=false”); … Read more
You can use the formula that calculates distances between two points. For example: function get_distance($latitude1, $longitude1, $latitude2, $longitude2, $unit=”Mi”) { $theta = $longitude1 – $longitude2; $distance = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta))); $distance = acos($distance); $distance = rad2deg($distance); $distance = $distance * 60 * 1.1515; switch($unit) { case ‘Mi’: break; case … Read more
This is similar to my other answer here, however, this is different due to the fact that you are extending the MapFragment and have your custom behavior implemented inside the Fragment. Here is an example Fragment that extends SupportMapFragment, on launch it will get the user’s current location, place a Marker, and zoom in: public … Read more
For C++, a map works well. Several million objects won’t be a problem. 10 million items took about 4.4 seconds and about 57 meg on my computer. My test application is as follows: #include <stdio.h> #include <stdlib.h> #include <map> class triple { public: int x; int y; int z; bool operator<(const triple &other) const { … Read more
To answer your question in one sentence: Per default, Maps don’t have a last entry, it’s not part of their contract. And a side note: it’s good practice to code against interfaces, not the implementation classes (see Effective Java by Joshua Bloch, Chapter 8, Item 52: Refer to objects by their interfaces). So your declaration … Read more
convert long,lat of all points to cartesian 3D space coordinates it is conversion spherical -> cartesian 3D space. Math behind is here. After this all points (long,lat,alt) will became (x,y,z) where (0,0,0) is center of the Earth X axis is lat=0,long=0 [rad] Y axis is lat=0,long=+PI/2 [rad] Z axis is North XY plane is equator … Read more