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104 lines
1.8 KiB
104 lines
1.8 KiB
2 years ago
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/*
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* Simple trackball-like motion adapted (ripped off) from projtex.c
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* (written by David Yu and David Blythe). See the SIGGRAPH '96
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* Advanced OpenGL course notes.
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*
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*
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* Usage:
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*
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* o call tbInit() in before any other tb call
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* o call tbReshape() from the reshape callback
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* o call tbMatrix() to get the trackball matrix rotation
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* o call tbStartMotion() to begin trackball movememt
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* o call tbStopMotion() to stop trackball movememt
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* o call tbMotion() from the motion callback
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* o call tbAnimate(GL_TRUE) if you want the trackball to continue
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* spinning after the mouse button has been released
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* o call tbAnimate(GL_FALSE) if you want the trackball to stop
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* spinning after the mouse button has been released
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*
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* Typical setup:
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*
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*
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void
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init(void)
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{
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tbInit(GLUT_MIDDLE_BUTTON);
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tbAnimate(GL_TRUE);
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. . .
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}
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void
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reshape(int width, int height)
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{
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tbReshape(width, height);
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. . .
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}
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void
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display(void)
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{
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glPushMatrix();
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tbMatrix();
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. . . draw the scene . . .
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glPopMatrix();
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}
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void
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mouse(int button, int state, int x, int y)
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{
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tbMouse(button, state, x, y);
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. . .
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}
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void
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motion(int x, int y)
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{
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tbMotion(x, y);
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. . .
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}
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int
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main(int argc, char** argv)
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{
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. . .
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init();
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glutReshapeFunc(reshape);
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glutDisplayFunc(display);
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glutMouseFunc(mouse);
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glutMotionFunc(motion);
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. . .
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}
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*
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* */
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/* functions */
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#ifdef __cplusplus
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extern "C" {
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#endif
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void
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tbInit(GLuint button);
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void
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tbMatrix(void);
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void
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tbReshape(int width, int height);
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void
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tbMouse(int button, int state, int x, int y);
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void
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tbMotion(int x, int y);
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void
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tbAnimate(GLboolean animate);
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#ifdef __cplusplus
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}
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#endif
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