gluPartialDisk(3G)	       OpenGL Reference		    gluPartialDisk(3G)

NAME    [Toc]    [Back]

     gluPartialDisk - draw an arc of a disk

C SPECIFICATION    [Toc]    [Back]

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

PARAMETERS    [Toc]    [Back]

     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    [Toc]    [Back]

     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 concentric
     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).  This means that if
     the orientation is	set to GLU_OUTSIDE, then any normals generated point
     along the +z axis.	Otherwise, 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).



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gluPartialDisk(3G)	       OpenGL Reference		    gluPartialDisk(3G)

SEE ALSO    [Toc]    [Back]

     gluCylinder, gluDisk, gluNewQuadric, gluQuadricOrientation,
     gluQuadricTexture,	gluSphere


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