OpenGL simple examples.

glLoadIdentity()

glClear(GL_COLOR_BUFFER_BIT)

glBegin(GL_POLYGON)

glColor4f(1.0f, 0.0f, 0.0f, 1.0f)

glVertex2f(100.0f, 50.0f)

glColor4f(0.0f, 1.0f, 0.0f, 1.0f)

glVertex2f(450.0f, 400.0f)

glColor4f(0.0f, 0.0f, 1.0f, 1.0f)

glVertex2f(450.0f, 50.0f)

glVertex2f(100.0f, 400.0f)

glEnd()

glFlush() -OpenGL simple examples.

glLoadIdentity()

glClear(GL_COLOR_BUFFER_BIT)

glBegin(GL_POLYGON)

glColor4f(1.0f, 0.0f, 0.0f, 1.0f)

glVertex2f(100.0f, 50.0f)

glColor4f(0.0f, 1.0f, 0.0f, 1.0f)

glVertex2f(450.0f, 400.0f)

glColor4f(0.0f, 0.0f, 1.0f, 1.0f)　　

glVertex2f(450.0f, 50.0f)

glVertex2f(100.0f, 400.0f)

glEnd()

glFlush()