Q. bout translations

when v translate a polygon, does opengl translate it from the first point or from the center of the polygon?

i have a display list that draws a polygon, and i want to translate it. should i translate it with reference to one of its vertices/edges or the center of the polygon?

Every vertex is translated.

OpenGL doesnt translate ne object, it uses transformation of coordinate systems,

Although it pretty similar and confusing with point transformations, its different!

U can read more bout this in ne graphics book or http://courses.cs.vt.edu/~cs4204/lectures/2dtransform_lecture.pdf