100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
/**
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* \addtogroup unixsimulator
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*/
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/*@{*/
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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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*
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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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*
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* void
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* display(void)
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* {
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* glPushMatrix();
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*
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* tbMatrix();
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* . . . draw the scene . . .
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*
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* glPopMatrix();
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* }
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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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*
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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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*
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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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* @file trackball.h
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* @brief Header file for helper functions for the UNIX platform Borg simulator.
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* @author Martin Ongsiek, David Yu, David Blythe
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*/
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/* functions */
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void tbInit(GLuint button);
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void tbMatrix(void);
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void tbReshape(int width, int height);
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void tbMouse(int button, int state, int x, int y);
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void tbMotion(int x, int y);
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void tbAnimate(GLboolean animate);
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/*@}*/
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