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void mouse(int btn, int state, int x, int y)\n{\nint mod = glutGetModifiers();\nif(btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN) axis = 0;\nif(mod&GLUT_ACTIVE_CTRL &&btn==GLUT_LEFT_BUTTON && state == GLUT_DOWN) axis = 1;\nif(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN) axis = 2;

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theta[axis] += 2.0;\nif( theta[axis] > 360.0 ) theta[axis] -= 360.0;\ndisplay();

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