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gluPartialDisk

Chapter 14

318

gluPartialDisk

gluPartialDisk: draw an arc of a disk.

C Speciﬁcation

void gluPartialDisk(

GLUquadric* quad,

GLdouble inner,

GLdouble outer,

GLint slices,

GLint loops,

GLdouble start,

GLdouble sweep)

Parameters

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

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).

HP b2600 Reference Guide

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