My map editor is really very simple, there are no buttons or mouse control. Still maybe you can use it as a basis or just have a look at it, so here's a link to the file (87 Kb):
worldEditor.zip
I cleaned up the source code and added some comments, all the controls and details are in the source code (controls are the cursor keys and space bar, plus L for load and S for save (always from and to the same default file) and [ and ] for selecting the current drawing tile).
worldEditor.zip
I cleaned up the source code and added some comments, all the controls and details are in the source code (controls are the cursor keys and space bar, plus L for load and S for save (always from and to the same default file) and [ and ] for selecting the current drawing tile).