I Have a need for a graphical interface to the data.

Think Hotel Floor plan, or car-park layout or slips in a Marina.

Given an image, I need to be able to define regions as entities, and color code each entity, and have a click event that will pull it back.

I've done this in fancy expensive GIS programs, but that's overkill for this.

I really only need one 'map' file for each location, and maybe 250 distinct entities.

Has anyone got an example? want to quote building it?

Could be Web or desktop.