void
glSlider::Draw()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,300,0,300,-1,1); // ATTENZIONE HACK
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
int curp=CurPos();
glDisable(GL_LIGHTING);
glBegin(GL_LINE_LOOP);
glVertex2i(px , py
);
glVertex2i(px+sx, py );
glVertex2i(px+sx, py+sy);
glVertex2i(px , py+sy);
glEnd();
glBegin(GL_QUADS);
glVertex2i(curp-sy/2,py);
glVertex2i(curp+sy/2,py);
glVertex2i(curp+sy/2,py+sy);
glVertex2i(curp-sy/2,py+sy);
glEnd();
}