QGIS Application in C++ [closed]

Question

I'm new to QGIS 2.8 Library to develop standalone map application in qt4, C++ language. I was wondering if there is any way that I can use QGIS plugins such as Advanced viewshed analysis, Contour plugin and so on by:

creating a dll library by rewriting the python code to c++ after obtaining the plugins source code from github(with credits of course, will have to study Python since am more of c++ developer)

writing a wrapper around the code

If anyone has done one of the above can you tell me which one is better and where to start?

Edited: I've already develop a standalone application which can load multiple vectors and raster maps, calculate distance and area, display different svg icons on map and get pixel values of a point(elevation data) from the map. the only remaining parts that i want to develop is the above listed points.

Answer 1

Looks like you're trying to jump to advanced stuff without first trying developing a simple C++ standalone QGIS application.

Specifically, a QT C++ application calling QGIS C++ API

QT C++ application using QGIS API

After that, concering plugins reusing, you'll have to check first if the plugin was written in C++ (the original way of doing it) or in Python.

In the first case you'll probably can reuse all the code calling QGIS C++ API.

In the second case the plugin will be using PyQt and in that case you'll have find a way to call not only PyQt code from your C++ QT standalone application,. but also PyQGIS.

It's worth nothing PyQGIS is using SIP to interface with the underlaying C++, in case you want to dive in the source code, and not the more commonly used SWiG interface, for generating Python bindings.

Note: QGIS 2.8 is very old.