gluPartialDisk function
The gluPartialDisk function draws an arc of a disk.
Syntax
void WINAPI gluPartialDisk(
GLUquadric *qobj,
GLdouble innerRadius,
GLdouble outerRadius,
GLint slices,
GLint loops,
GLdouble startAngle,
GLdouble sweepAngle
);
Parameters
 qobj

A quadric object (created with gluNewQuadric).
 innerRadius

The inner radius of the partial disk (can be zero).
 outerRadius

The outer radius of the partial disk.
 slices

The number of subdivisions around the zaxis.
 loops

The number of concentric rings about the origin into which the partial disk is subdivided.
 startAngle

The starting angle, in degrees, of the disk portion.
 sweepAngle

The sweep angle, in degrees, of the disk portion.
Return value
This function does not return a value.
Remarks
The gluPartialDisk function 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 startAngle through startAngle + sweepAngle is included (where 0 degrees is along the positive yaxis, 90 degrees is along the positive xaxis, 180 degrees is along the negative yaxis, and 270 degrees is along the negative xaxis).
The partial disk has a radius of outerRadius and contains a concentric circular hole with a radius of innerRadius. If innerRadius is zero, then no hole is generated. The partial disk is subdivided around the zaxis into slices (like pizza slices), and also about the zaxis into rings (as specified by slices and loops, respectively).
With respect to orientation, the positive zside 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 positive zaxis.
If you have turned on texturing (with gluQuadricTexture), gluPartialDisk generates texture coordinates linearly such that where r = outerRadius, the value at (r, 0, 0) is (1, 0.5); at (0, r, 0) it is (0.5, 1); at (r, 0, 0) it is (0, 0.5); and at (0, r, 0) it is (0.5, 0).
Requirements
Minimum supported client  Windows 2000 Professional [desktop apps only] 

Minimum supported server  Windows 2000 Server [desktop apps only] 
Header 

Library 

DLL 

See also