kc3-lang/ftgl/demo/tb.h

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  Commit

• Author : henry
  Date : 2002-02-16 05:42:47
  Hash : 3922d728
  Message : Added EXTERN "C"

• demo/tb.h

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