gluPartialDisk()gluPartialDisk()NAMEgluPartialDisk - draw an arc of a disk
SYNOPSIS
void gluPartialDisk(
GLUquadric* quad,
GLdouble inner,
GLdouble outer,
GLint slices,
GLint loops,
GLdouble start,
GLdouble sweep );
PARAMETERS
Specifies a quadrics object (created with gluNewQuadric()). Specifies
the inner radius of the partial disk (can be 0). Specifies the outer
radius of the partial disk. Specifies the number of subdivisions
around the z axis. Specifies the number of concentric rings about the
origin into which the partial disk is subdivided. Specifies the start‐
ing angle, in degrees, of the disk portion. Specifies the sweep angle,
in degrees, of the disk portion.
DESCRIPTIONgluPartialDisk() renders a partial disk on the $ z = 0 $ plane. A par‐
tial 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 +yFoNt axis, 90 degrees along the +x axis, 180 along the -y
axis, and 270 along the -x axis).
The partial disk has a radius of outer, and contains a concentric cir‐
cular hole with a radius of inner. If inner is 0, then no hole is gen‐
erated. 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 +zside of the partial disk is consid‐
ered 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 -zaxis.
If texturing is turned on (with gluQuadricTexture()), texture coordi‐
nates 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 ALSOgluCylinder(3), gluDisk(3), gluNewQuadric(3), gluQuadricOrientation(3),
gluQuadricTexture(3), gluSphere(3)gluPartialDisk()