Zoomer Window Demo
This is a very simple FlTk/LibTarga Demo I through together. It does some funky FlTk stuff (a custom image display function).
It basically makes a magnifying glass so you can zoom in on an image, and work on the details.
To use it, click/drag in the big window to set the magnifying glass, click/drag in the magnify window to paint.
This program might be useful in your first project, so you might want to try to understand how it works.
The parts of it are:
It's all in a ZIP file