MirOS Manual: gluPartialDisk(3)


GLUPARTIALDISK(3G)  UNIX Programmer's Manual   GLUPARTIALDISK(3G)

NAME

     gluPartialDisk - draw an arc of a disk

C SPECIFICATION

     void gluPartialDisk( GLUquadric* quad,
                          GLdouble inner,
                          GLdouble outer,
                          GLint slices,
                          GLint loops,
                          GLdouble start,
                          GLdouble sweep )

PARAMETERS

     quad    Specifies a quadrics object (created with
             gluNewQuadric).

     inner   Specifies the inner radius of the partial disk (can
             be 0).

     outer   Specifies the outer radius of the partial disk.

     slices  Specifies the number of subdivisions around the z
             axis.

     loops   Specifies the number of concentric rings about the
             origin into which the partial disk is subdivided.

     start   Specifies the starting angle, in degrees, of the
             disk portion.

     sweep   Specifies the sweep angle, in degrees, of the disk
             portion.

DESCRIPTION

     gluPartialDisk renders a partial disk on the z = 0 plane. A
     partial disk is similar to a full disk, except that only the
     subset of the disk from start through start + sweep is
     included (where 0 degrees is along the +y axis, 90 degrees
     along the +x axis, 180 degrees along the -y axis, and 270
     degrees along the -x axis).

     The partial disk has a radius of outer, and contains a con-
     centric circular hole with a radius of inner. If inner is 0,
     then no hole is generated. The partial disk is subdivided
     around the z axis into slices (like pizza slices), and also
     about the z axis into rings (as specified by slices and
     loops, respectively).

     With respect to orientation, the +z side of the partial disk
     is considered to be outside (see gluQuadricOrientation).

MirOS BSD #10-current  Printed 09.04.2016                       1

GLUPARTIALDISK(3G)  UNIX Programmer's Manual   GLUPARTIALDISK(3G)

     This means that if the orientation is set to GLU_OUTSIDE,
     then any normals generated point along the +z axis. Other-
     wise, they point along the -z axis.

     If texturing is turned on (with gluQuadricTexture), texture
     coordinates are generated linearly such that where
     r = outer, the value at (r, 0, 0) is (1.0, 0.5), at (0, r,
     0) it is (0.5, 1.0), at (-r, 0, 0) it is (0.0, 0.5), and at
     (0, -r, 0) it is (0.5, 0.0).

SEE ALSO

     gluCylinder(3G), gluDisk(3G), gluNewQuadric(3G),
     gluQuadricOrientation(3G), gluQuadricTexture(3G),
     gluSphere(3G)

MirOS BSD #10-current  Printed 09.04.2016                       2

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