(Yes, unfortunately, this is a homework question)
I've been given a struct for a 2D triangle with x and y coordinates, a rotation variable, and so on. From the point created by those x and y coordinates, I am supposed to draw a triangle around the point and rotate it appropriately using the rotation variable.
I'm familiar with drawing triangles in OpenGl with GL_TRIANGLES. My problem is somehow extracting the middle of a triangle and drawing the vertices around it.
I hope I've worded this properly, as I'm a little confused.
Thanks.
edit: Yes, what I am looking for is the centroid.