fgluNextContour(3G)

NAME
     fgluNextContour - mark the beginning of another contour


FORTRAN SPECIFICATION
     SUBROUTINE fgluNextContour( CHARACTER*8 tess,
                                 INTEGER*4 type )


PARAMETERS
     tess  Specifies the tessellation object (created with fgluNewTess).

     type  Specifies the type of the contour being defined. Valid values are
           GLU_EXTERIOR, GLU_INTERIOR, GLU_UNKNOWN, GLU_CCW, and GLU_CW.

DESCRIPTION
     fgluNextContour is used in describing polygons with multiple contours.
     After the first contour has been described through a series of
     fgluTessVertex calls, a fgluNextContour call indicates that the previous
     contour is complete and that the next contour is about to begin.  Another
     series of fgluTessVertex calls is then used to describe the new contour.
     This process can be repeated until all contours have been described.

     type defines what type of contour follows.  The legal contour types are
     as follows:

     GLU_EXTERIOR      An exterior contour defines an exterior boundary of the
                       polygon.

     GLU_INTERIOR      An interior contour defines an interior boundary of the
                       polygon (such as a hole).

     GLU_UNKNOWN       An unknown contour is analyzed by the library to
                       determine if it is interior or exterior.

     GLU_CCW,

     GLU_CW            The first GLU_CCW or GLU_CW contour defined is
                       considered to be exterior. All other contours are
                       considered to be exterior if they are oriented in the
                       same direction (clockwise or counterclockwise) as the
                       first contour, and interior if they are not.

     If one contour is of type GLU_CCW or GLU_CW, then all contours must be of
     the same type (if they are not, then all GLU_CCW and GLU_CW contours will
     be changed to GLU_UNKNOWN).

     Note that there is no real difference between the GLU_CCW and GLU_CW
     contour types.
     Before the first contour is described, fgluNextContour can be called to
     define the type of the first contour.  If fgluNextContour is not called
     before the first contour, then the first contour is marked GLU_EXTERIOR.

     This command is obsolete and is provided for backward compatibility only.
     Calls to fgluNextContour are mapped to fgluTessEndContour followed by
     fgluTessBeginContour.

EXAMPLE
     A quadrilateral with a triangular hole in it can be described as follows:


          gluBeginPolygon(tobj);
             gluTessVertex(tobj, v1, v1);
             gluTessVertex(tobj, v2, v2);
             gluTessVertex(tobj, v3, v3);
             gluTessVertex(tobj, v4, v4);
          gluNextContour(tobj, GLU_INTERIOR);
             gluTessVertex(tobj, v5, v5);
             gluTessVertex(tobj, v6, v6);
             gluTessVertex(tobj, v7, v7);
          gluEndPolygon(tobj);


SEE ALSO
     fgluBeginPolygon, fgluNewTess, fgluTessCallback, fgluTessVertex,
     fgluTessBeginContour