Rotations are around the origin, not necessarily the center of an object.
glBegin(GL_TRIANGLES) glVertex2f(0.5, 0.0) glVertex2f(0.8, 0.0) glVertex2f(0.65, 0.5) glEnd() |
 | |
glRotatef(90.0, 0.0, 0.0, 1.0) glBegin(GL_TRIANGLES) glVertex2f(0.5, 0.0) glVertex2f(0.8, 0.0) glVertex2f(0.65, 0.5) glEnd() |
 |