Glupartialdisk - HP b2600 Reference Manual

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gluPartialDisk

gluPartialDisk
gluPartialDisk: draw an arc of a disk.
C Specification
void gluPartialDisk(
Parameters
quad
inner
outer
slices
loops
start
sweep
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 along the Y axis,
and 270 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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GLUquadric* quad,
GLdouble inner,
GLdouble outer,
GLint slices,
GLint loops,
GLdouble start,
GLdouble sweep)
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 starting angle, in degrees, of the disk portion.
Specifies the sweep angle, in degrees, of the disk portion.
Chapter 14