Help with opening OSM in C++

General talk
1

Hi!

I’ve been trying to find a way too render OSM files in C++, have been googeling all over the place but cant seem to find any thing useful to help me.
I have tried using Mapnik, but cant find all the .h files it requires so that didn’t work.

Any one have an example app or any suggestions how to render OSM(or other map files) in C++ ??

2

Do you want to write a renderer on your own, or do you want to use an existing renderer from C++?

3

Would like to use something that exists if possible

Need it all to be offline, so it will need to use files lockal.

4

did you already have a look at the OSM wiki, with a search for “Renderer” or the category Renderer?

Maybe there is some more information about the programmin language of each renderer?

5

I`ve looked at the renderers at wiki but only one who was almost sensible was the mapnik renderer, but as I mentioned in the fist post, I couldn’t use it because of many missing .h files.

To explain some more, what I’m trying to make is a simple map in my c++ app. that I can set points on click that returns the coordinates of that point.

It does not have to have a full world map only a regional, so I’m starting to wonder if the solution is to just use an image of the region instead of rendering maps out of the OSM files, the problem then is to get the coordinates right(I think, haven’t tried it yet). it would be much easer then building my own renderer would it not ?
Any one got any ideas how to match up the coords and map ?

6

You probably can use the OSM-Tiles as the Map (don’t forget caching!) or a pre-rendered map with you own style (from cloudmade maybe).
Then you could click on the map and if you know which are the bounds and the width/height of your map, you can calculate the coordinates from it. Shouldn’t be complicated. For the slippy map inside an Application see the download dialog in i.e. JOSM (Java) or Merkaartor (C++).

7

Thanks for the reply`s.

Where can i download/generate OSM Tiles, and what format do the tiles come in ??
Im currently using an image of an map but dont know how to get the coordinates for it right.