GLT ZPR is a mouse manipulation module for C or C++ GLUT/OpenGL programs. It adds two lines of code to any GLUT based OpenGL program to enable zooming, panning, and rotation using the left, middle, and right mouse buttons. The middle mouse button can be simulated by using both left and right buttons together. The module works by providing GLUT callbacks for functions like glutReshapeFunc, glutMouseFunc, and glutMotionFunc, which manage the OpenGL modelview matrix according to mouse events received via GLUT.
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