gluPartialDisk

NAME

gluPartialDisk -- draw an arc of a disk

C SPECIFICATION

void gluPartialDisk(GLUquadricObj *qobj,
                    GLdouble innerRadius,
                    GLdouble outerRadius,
                    GLint slices,
                    GLint loops,
                    GLdouble startAngle,
                    GLdouble sweepAngle)

PARAMETERS

qobj: Specifies a quadrics object (created with gluNewQuadric).
innerRadius: Specifies the inner radius of the partial disk (can be zero).
outerRadius: Specifies the outer radius of the partial disk.
slices: Specfies 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.
startAngle: Specifies the starting angle, in degrees, of the disk portion.
sweepAngle: 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 startAngle through startAngle + sweepAngle 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 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 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 = 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).

gluPartialDisk

NAME

C SPECIFICATION

PARAMETERS

DESCRIPTION

SEE ALSO