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/ IRIX Base Documentation 2002 November / SGI IRIX Base Documentation 2002 November.iso / usr / share / catman / g_man / cat3 / OpenGL-ftn / fglupartialdisk.z / fglupartialdisk
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Text File  |  2002-10-03  |  5.1 KB  |  133 lines
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  4. ffffgggglllluuuuPPPPaaaarrrrttttiiiiaaaallllDDDDiiiisssskkkk((((3333GGGG))))            OOOOppppeeeennnnGGGGLLLL RRRReeeeffffeeeerrrreeeennnncccceeee            ffffgggglllluuuuPPPPaaaarrrrttttiiiiaaaallllDDDDiiiisssskkkk((((3333GGGG))))
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  8. NNNNAAAAMMMMEEEE
  9.      ffffgggglllluuuuPPPPaaaarrrrttttiiiiaaaallllDDDDiiiisssskkkk - draw an arc of a disk
  10.  
  11.  
  12. FFFFOOOORRRRTTTTRRRRAAAANNNN SSSSPPPPEEEECCCCIIIIFFFFIIIICCCCAAAATTTTIIIIOOOONNNN
  13.      SUBROUTINE ffffgggglllluuuuPPPPaaaarrrrttttiiiiaaaallllDDDDiiiisssskkkk( CHARACTER*8 _q_u_a_d,
  14.                                  REAL*4 _i_n_n_e_r,
  15.                                  REAL*4 _o_u_t_e_r,
  16.                                  INTEGER*4 _s_l_i_c_e_s,
  17.                                  INTEGER*4 _l_o_o_p_s,
  18.                                  REAL*4 _s_t_a_r_t,
  19.                                  REAL*4 _s_w_e_e_p )
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  22. PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
  23.      _q_u_a_d    Specifies a quadrics object (created with ffffgggglllluuuuNNNNeeeewwwwQQQQuuuuaaaaddddrrrriiiicccc).
  24.  
  25.      _i_n_n_e_r   Specifies the inner radius of the partial disk (can be 0).
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  27.      _o_u_t_e_r   Specifies the outer radius of the partial disk.
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  29.      _s_l_i_c_e_s  Specifies the number of subdivisions around the _z axis.
  30.  
  31.      _l_o_o_p_s   Specifies the number of concentric rings about the origin into
  32.              which the partial disk is subdivided.
  33.  
  34.      _s_t_a_r_t   Specifies the starting angle, in degrees, of the disk portion.
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  36.      _s_w_e_e_p   Specifies the sweep angle, in degrees, of the disk portion.
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  38. DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
  39.      ffffgggglllluuuuPPPPaaaarrrrttttiiiiaaaallllDDDDiiiisssskkkk renders a partial disk on the z = 0 plane. A partial disk
  40.      is similar to a full disk, except that only the subset of the disk from
  41.      _s_t_a_r_t through _s_t_a_r_t + _s_w_e_e_p is included (where 0 degrees is along the +_y
  42.      axis, 90 degrees along the +_x axis, 180 degrees along the -_y axis, and
  43.      270 degrees along the -_x axis).
  44.  
  45.      The partial disk has a radius of _o_u_t_e_r, and contains a concentric
  46.      circular hole with a radius of _i_n_n_e_r. If _i_n_n_e_r is 0, then no hole is
  47.      generated. The partial disk is subdivided around the _z axis into slices
  48.      (like pizza slices), and also about the _z axis into rings (as specified
  49.      by _s_l_i_c_e_s and _l_o_o_p_s, respectively).
  50.  
  51.      With respect to orientation, the +_z side of the partial disk is
  52.      considered to be outside (see ffffgggglllluuuuQQQQuuuuaaaaddddrrrriiiiccccOOOOrrrriiiieeeennnnttttaaaattttiiiioooonnnn).  This means that
  53.      if the orientation is set to GGGGLLLLUUUU____OOOOUUUUTTTTSSSSIIIIDDDDEEEE, then any normals generated
  54.      point along the +_z axis. Otherwise, they point along the -_z axis.
  55.  
  56.      If texturing is turned on (with ffffgggglllluuuuQQQQuuuuaaaaddddrrrriiiiccccTTTTeeeexxxxttttuuuurrrreeee), texture coordinates
  57.      are generated linearly such that where r = outer, the value at (_r, 0, 0)
  58.      is (1.0, 0.5), at (0, _r, 0) it is (0.5, 1.0), at (-_r, 0, 0) it is (0.0,
  59.      0.5), and at (0, -_r, 0) it is (0.5, 0.0).
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  63.                                                                         PPPPaaaaggggeeee 1111
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  70. ffffgggglllluuuuPPPPaaaarrrrttttiiiiaaaallllDDDDiiiisssskkkk((((3333GGGG))))            OOOOppppeeeennnnGGGGLLLL RRRReeeeffffeeeerrrreeeennnncccceeee            ffffgggglllluuuuPPPPaaaarrrrttttiiiiaaaallllDDDDiiiisssskkkk((((3333GGGG))))
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  74. SSSSEEEEEEEE AAAALLLLSSSSOOOO
  75.      ffffgggglllluuuuCCCCyyyylllliiiinnnnddddeeeerrrr, ffffgggglllluuuuDDDDiiiisssskkkk, ffffgggglllluuuuNNNNeeeewwwwQQQQuuuuaaaaddddrrrriiiicccc, ffffgggglllluuuuQQQQuuuuaaaaddddrrrriiiiccccOOOOrrrriiiieeeennnnttttaaaattttiiiioooonnnn,
  76.      ffffgggglllluuuuQQQQuuuuaaaaddddrrrriiiiccccTTTTeeeexxxxttttuuuurrrreeee, ffffgggglllluuuuSSSSpppphhhheeeerrrreeee
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  129.                                                                         PPPPaaaaggggeeee 2222
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