shapes.c

mesa-6.5-minigui源码

        for (j=0; j<slices; j++)
        {
            glVertex3d(cost[j+0]*r0,   sint[j+0]*r0,   z0    );
            glVertex3d(0,              0,              height);
            glNormal3d(cost[j+1]*sinn, sint[j+1]*sinn, cosn  );
            glVertex3d(cost[j+1]*r0,   sint[j+1]*r0,   z0    );
        }

    glEnd();

    /* Release sin and cos tables */

    free(sint);
    free(cost);
}

/*
 * Draws a wire cone
 */
void GLUTAPIENTRY glutWireCone( GLdouble base, GLdouble height, GLint slices, GLint stacks)
{
    int i,j;

    /* Step in z and radius as stacks are drawn. */

    double z = 0.0;
    double r = base;

    const double zStep = height/stacks;
    const double rStep = base/stacks;

    /* Scaling factors for vertex normals */

    const double cosn = ( height / sqrt ( height * height + base * base ));
    const double sinn = ( base   / sqrt ( height * height + base * base ));

    /* Pre-computed circle */

    double *sint,*cost;
    circleTable(&sint,&cost,-slices);

    /* Draw the stacks... */

    for (i=0; i<stacks; i++)
    {
        glBegin(GL_LINE_LOOP);

            for( j=0; j<slices; j++ )
            {
                glNormal3d(cost[j]*sinn, sint[j]*sinn, cosn);
                glVertex3d(cost[j]*r,    sint[j]*r,    z   );
            }

        glEnd();

        z += zStep;
        r -= rStep;
    }

    /* Draw the slices */

    r = base;

    glBegin(GL_LINES);

        for (j=0; j<slices; j++)
        {
            glNormal3d(cost[j]*sinn, sint[j]*sinn, cosn  );
            glVertex3d(cost[j]*r,    sint[j]*r,    0.0   );
            glVertex3d(0.0,          0.0,          height);
        }

    glEnd();

    /* Release sin and cos tables */

    free(sint);
    free(cost);
}


/*
 * Draws a solid cylinder
 */
void GLUTAPIENTRY glutSolidCylinder(GLdouble radius, GLdouble height, GLint slices, GLint stacks)
{
    int i,j;

    /* Step in z and radius as stacks are drawn. */

          double z0,z1;
    const double zStep = height/stacks;

    /* Pre-computed circle */

    double *sint,*cost;
    circleTable(&sint,&cost,-slices);

    /* Cover the base and top */

    glBegin(GL_TRIANGLE_FAN);
        glNormal3d(0.0, 0.0, -1.0 );
        glVertex3d(0.0, 0.0,  0.0 );
        for (j=0; j<=slices; j++)
          glVertex3d(cost[j]*radius, sint[j]*radius, 0.0);
    glEnd();

    glBegin(GL_TRIANGLE_FAN);
        glNormal3d(0.0, 0.0, 1.0   );
        glVertex3d(0.0, 0.0, height);
        for (j=slices; j>=0; j--)
          glVertex3d(cost[j]*radius, sint[j]*radius, height);
    glEnd();

    /* Do the stacks */

    z0 = 0.0;
    z1 = zStep;

    for (i=1; i<=stacks; i++)
    {
        if (i==stacks)
            z1 = height;

        glBegin(GL_QUAD_STRIP);
            for (j=0; j<=slices; j++ )
            {
                glNormal3d(cost[j],        sint[j],        0.0 );
                glVertex3d(cost[j]*radius, sint[j]*radius, z0  );
                glVertex3d(cost[j]*radius, sint[j]*radius, z1  );
            }
        glEnd();

        z0 = z1; z1 += zStep;
    }

    /* Release sin and cos tables */

    free(sint);
    free(cost);
}

/*
 * Draws a wire cylinder
   */
void GLUTAPIENTRY glutWireCylinder(GLdouble radius, GLdouble height, GLint slices, GLint stacks)
{
    int i,j;

    /* Step in z and radius as stacks are drawn. */

          double z = 0.0;
    const double zStep = height/stacks;

    /* Pre-computed circle */

    double *sint,*cost;
    circleTable(&sint,&cost,-slices);

    /* Draw the stacks... */

    for (i=0; i<=stacks; i++)
    {
        if (i==stacks)
            z = height;

        glBegin(GL_LINE_LOOP);

            for( j=0; j<slices; j++ )
            {
                glNormal3d(cost[j],        sint[j],        0.0);
                glVertex3d(cost[j]*radius, sint[j]*radius, z  );
            }

        glEnd();

        z += zStep;
    }

    /* Draw the slices */

    glBegin(GL_LINES);

        for (j=0; j<slices; j++)
        {
            glNormal3d(cost[j],        sint[j],        0.0   );
            glVertex3d(cost[j]*radius, sint[j]*radius, 0.0   );
            glVertex3d(cost[j]*radius, sint[j]*radius, height);
        }

    glEnd();

    /* Release sin and cos tables */

    free(sint);
    free(cost);
}

/*
 *
 */
void GLUTAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
{
  double  iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
  double *vertex, *normal;
  int    i, j;
  double spsi, cpsi, sphi, cphi ;

  /*
   * Allocate the vertices array
   */
  vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
  normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );

  glPushMatrix();

  dpsi =  2.0 * M_PI / (double)nRings ;
  dphi = -2.0 * M_PI / (double)nSides ;
  psi  = 0.0;

  for( j=0; j<nRings; j++ )
  {
    cpsi = cos ( psi ) ;
    spsi = sin ( psi ) ;
    phi = 0.0;

    for( i=0; i<nSides; i++ )
    {
      int offset = 3 * ( j * nSides + i ) ;
      cphi = cos ( phi ) ;
      sphi = sin ( phi ) ;
      *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
      *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
      *(vertex + offset + 2) =                    sphi * iradius  ;
      *(normal + offset + 0) = cpsi * cphi ;
      *(normal + offset + 1) = spsi * cphi ;
      *(normal + offset + 2) =        sphi ;
      phi += dphi;
    }

    psi += dpsi;
  }

  for( i=0; i<nSides; i++ )
  {
    glBegin( GL_LINE_LOOP );

    for( j=0; j<nRings; j++ )
    {
      int offset = 3 * ( j * nSides + i ) ;
      glNormal3dv( normal + offset );
      glVertex3dv( vertex + offset );
    }

    glEnd();
  }

  for( j=0; j<nRings; j++ )
  {
    glBegin(GL_LINE_LOOP);

    for( i=0; i<nSides; i++ )
    {
      int offset = 3 * ( j * nSides + i ) ;
      glNormal3dv( normal + offset );
      glVertex3dv( vertex + offset );
    }

    glEnd();
  }

  free ( vertex ) ;
  free ( normal ) ;
  glPopMatrix();
}

/*
 *
 */
void GLUTAPIENTRY glutSolidTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
{
  double  iradius = dInnerRadius, oradius = dOuterRadius, phi, psi, dpsi, dphi;
  double *vertex, *normal;
  int    i, j;
  double spsi, cpsi, sphi, cphi ;

  /*
   * Increment the number of sides and rings to allow for one more point than surface
   */
  nSides ++ ;
  nRings ++ ;

  /*
   * Allocate the vertices array
   */
  vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
  normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );

  glPushMatrix();

  dpsi =  2.0 * M_PI / (double)(nRings - 1) ;
  dphi = -2.0 * M_PI / (double)(nSides - 1) ;
  psi  = 0.0;

  for( j=0; j<nRings; j++ )
  {
    cpsi = cos ( psi ) ;
    spsi = sin ( psi ) ;
    phi = 0.0;

    for( i=0; i<nSides; i++ )
    {
      int offset = 3 * ( j * nSides + i ) ;
      cphi = cos ( phi ) ;
      sphi = sin ( phi ) ;
      *(vertex + offset + 0) = cpsi * ( oradius + cphi * iradius ) ;
      *(vertex + offset + 1) = spsi * ( oradius + cphi * iradius ) ;
      *(vertex + offset + 2) =                    sphi * iradius  ;
      *(normal + offset + 0) = cpsi * cphi ;
      *(normal + offset + 1) = spsi * cphi ;
      *(normal + offset + 2) =        sphi ;
      phi += dphi;
    }

    psi += dpsi;
  }

    glBegin( GL_QUADS );
  for( i=0; i<nSides-1; i++ )
  {
    for( j=0; j<nRings-1; j++ )
    {
      int offset = 3 * ( j * nSides + i ) ;
      glNormal3dv( normal + offset );
      glVertex3dv( vertex + offset );
      glNormal3dv( normal + offset + 3 );
      glVertex3dv( vertex + offset + 3 );
      glNormal3dv( normal + offset + 3 * nSides + 3 );
      glVertex3dv( vertex + offset + 3 * nSides + 3 );
      glNormal3dv( normal + offset + 3 * nSides );
      glVertex3dv( vertex + offset + 3 * nSides );
    }
  }

  glEnd();

  free ( vertex ) ;
  free ( normal ) ;
  glPopMatrix();
}

/*
 *
 */
void GLUTAPIENTRY glutWireDodecahedron( void )
{
  /* Magic Numbers:  It is possible to create a dodecahedron by attaching two pentagons to each face of
   * of a cube.  The coordinates of the points are:
   *   (+-x,0, z); (+-1, 1, 1); (0, z, x )
   * where x = 0.61803398875 and z = 1.61803398875.
   */
  glBegin ( GL_LINE_LOOP ) ;
  glNormal3d (  0.0,  0.525731112119,  0.850650808354 ) ; glVertex3d (  0.0,  1.61803398875,  0.61803398875 ) ; glVertex3d ( -1.0,  1.0,  1.0 ) ; glVertex3d ( -0.61803398875, 0.0,  1.61803398875 ) ; glVertex3d (  0.61803398875, 0.0,  1.61803398875 ) ; glVertex3d (  1.0,  1.0,  1.0 ) ;
  glEnd () ;
  glBegin ( GL_LINE_LOOP ) ;
  glNormal3d (  0.0,  0.525731112119, -0.850650808354 ) ; glVertex3d (  0.0,  1.61803398875, -0.61803398875 ) ; glVertex3d (  1.0,  1.0, -1.0 ) ; glVertex3d (  0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d ( -1.0,  1.0, -1.0 ) ;
  glEnd () ;
  glBegin ( GL_LINE_LOOP ) ;
  glNormal3d (  0.0, -0.525731112119,  0.850650808354 ) ; glVertex3d (  0.0, -1.61803398875,  0.61803398875 ) ; glVertex3d (  1.0, -1.0,  1.0 ) ; glVertex3d (  0.61803398875, 0.0,  1.61803398875 ) ; glVertex3d ( -0.61803398875, 0.0,  1.61803398875 ) ; glVertex3d ( -1.0, -1.0,  1.0 ) ;
  glEnd () ;
  glBegin ( GL_LINE_LOOP ) ;
  glNormal3d (  0.0, -0.525731112119, -0.850650808354 ) ; glVertex3d (  0.0, -1.61803398875, -0.61803398875 ) ; glVertex3d ( -1.0, -1.0, -1.0 ) ; glVertex3d ( -0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d (  0.61803398875, 0.0, -1.61803398875 ) ; glVertex3d (  1.0, -1.0, -1.0 ) ;
  glEnd () ;

  glBegin ( GL_LINE_LOOP ) ;
  glNormal3d (  0.850650808354,  0.0,  0.525731112119 ) ; glVertex3d (  0.61803398875,  0.0,  1.61803398875 ) ; glVertex3d (  1.0, -1.0,  1.0 ) ; glVertex3d (  1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d (  1.61803398875,  0.61803398875, 0.0 ) ; glVertex3d (  1.0,  1.0,  1.0 ) ;
  glEnd () ;
  glBegin ( GL_LINE_LOOP ) ;
  glNormal3d ( -0.850650808354,  0.0,  0.525731112119 ) ; glVertex3d ( -0.61803398875,  0.0,  1.61803398875 ) ; glVertex3d ( -1.0,  1.0,  1.0 ) ; glVertex3d ( -1.61803398875,  0.61803398875, 0.0 ) ; glVertex3d ( -1.61803398875, -0.61803398875, 0.0 ) ; glVertex3d ( -1.0, -1.0,  1.0 ) ;
  glEnd () ;
  glBegin ( GL_LINE_LOOP ) ;