init code void myinit(void / attributes*/ glClear Color (1.0, 1.0, 1.0, 1.0); / * white background * glColor3f(1.0, 0.0,0.0); / draw in red*/ / set up viewing /*500x 50.0 camera coordinate window with origin lower left * gIMatrixMode(GL PROjECtIon) gILoadldentityo gluortho2D(0.0,50.0,0.0,50.0) gIMatrixMode(GL MODELVIEwinit code void myinit(void) { /* attributes */ glClearColor(1.0, 1.0, 1.0, 1.0); /* white background */ glColor3f(1.0, 0.0, 0.0); /* draw in red */ /* set up viewing */ /* 50.0 × 50.0 camera coordinate window with origin lower left */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0.0, 50.0, 0.0, 50.0); glMatrixMode(GL_MODELVIEW); } 6