Google Maps Android API v2 – Sample Code crashes

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

What is the Big O performance of maps in golang?

The language reference doesn’t make explicit guarantees about the performance of maps. There’s an implicit expectation that maps perform like you expect hash-tables to perform. I don’t see how a performance guarantee would avoid being either vaguely specified or inaccurate. Big-O complexity is a poor way to describe run-times for maps: practically speaking the actual … Read more

How to efficiently compare two maps of strings in C++ only for a subset of the keys

I am not sure what exactly you are looking for, so let me first give complete equality and then key equality. Maybe the latter fits your needs already. Complete Equality (While standard equivalence can be tested using std::map‘s own comparison operators, the following can be used as a base for a comparison on a per-value … Read more

Can I prevent panning Leaflet map out of the world’s edge?

Leaflet allows you to control how much the map resists being dragged out of bounds with the maxBoundsViscosity option (value: 0 to 1). Setting it to maximum disables dragging out of bounds entirely. var map = new L.Map(‘map’, { center: bounds.getCenter(), zoom: 5, layers: [osm], maxBounds: bounds, maxBoundsViscosity: 1.0 }); This feature is available in … Read more

Using java map for range searches

I can think of a number of possible solutions for the more general problem where the ranges are not uniform and there are ‘holes’. The simplest are: Simply populate a Map for all valid key values, with multiple keys mapping to the same value. Assuming that you use HashMaps, this should be the most time … Read more

Using custom map image tiles in LeafletJS?

You are looking for a TileLayer. In this TileLayer, you give the URL for the to-be-fetched images to leaflet with a template like this: http://{s}.somedomain.com/blabla/{z}/{x}/{y}.png When you are at the specified zoom, x and y level, Leaflet will automatically fetch the tiles on the URL you gave. Depending on the image you want to show, … Read more