Thread: glRotate

hi,
what i have is a quad that looks like an arrow:

Code:

	glBegin(GL_QUADS);
	glTexCoord2f(0.0f, 0.0f);
	glVertex3f(-1.0f, 1.0f, 0.0f);

	glTexCoord2f(1.0f, 0.0f);
	glVertex3f(-0.5f, 0.5f, 0.0f);

	glTexCoord2f(1.0f, 1.0f);
	glVertex3f(-1.0f, 0.0f, 0.0f);

    glTexCoord2f(0.0f, 1.0f);
	glVertex3f(1.0f,  0.5f, 0.0f);
	glEnd();

if i do glRotatef(a, 1.0f, 0.0f, 0.0f); it rotates around the lower left vertex, that is the lower left never moves. how do i make it rotate around the center?

thanks. figured it out