Now I want to do such thing:
1. read a few points (2D) from a file;
2. display the points to the screen;
3. call fglTranslatef, fglScalef and fglRotatef (Only 2D)to these points.
4. after these transform, I will input new points by mouse click.
Now I want to know: How can I get the new coords of the inputted points from there coords of screen?Are there any subroutines in opengl?