I want to have a good begin in OpenGL

would you please provide me with the code that enable the user to draw a ploygon only by clicking randomly on the screen-windo, those cliks will be the input vertixies.

& how can I create a drop down menu that provide 3 options (rotate, scale, translate)
these options accept inputs from the user to determen these functions arguments by a dialog box. this menu will perform the 3 options on the above described polygon.

take a look at nehe.gamedev.net , check the tutorial section, it’s really amazing ! IMO, the best place to start from …