gluPartialDisk - draw an arc of a disk
void gluPartialDisk( | GLUquadric* | quad, |
| GLfloat | inner, | |
| GLfloat | outer, | |
| GLint | slices, | |
| GLint | loops, | |
| GLfloat | start, | |
| GLfloat | sweep); |
quadSpecifies a quadrics object (created with gluNewQuadric).
innerSpecifies the inner radius of the partial disk (can be 0).
outerSpecifies the outer radius of the partial disk.
slicesSpecifies the number of subdivisions around the z axis.
loopsSpecifies the number of concentric rings about the origin into which the partial disk is subdivided.
startSpecifies the starting angle, in degrees, of the disk portion.
sweepSpecifies the sweep angle, in degrees, of the disk portion.
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 = 0 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).
Copyright c 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.