glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(-0.8f, 0.1f); glVertex2f(-0.2f, 0.1f); glVertex2f(-0.2f, 0.7f); glVertex2f(-0.8f, 0.7f);. 我们将颜色设置为红色(R=1,G=0 ...
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