I need a tool that is able to:
- Draw 2D/3D geometric objects given the sufficient attributes (center, raduis for a circle, lower-left corner and side length for a cube etc.)
- Show the intersection points of those objects.
- Show the distance between some specific points (like intersections, centers, a point on a surface to another point etc.)
- Let me modify the objects by drag&drop, wihout closing the initial window.
gnuplot is the best alternative so far, but it requires a spaghetti code for a little bit complicated cases.
Edit: I found Dr. Geo but it is not so useful and user friendly.