88 lines
2.6 KiB
Plaintext
88 lines
2.6 KiB
Plaintext
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'\" e
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'\"! eqn | mmdoc
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'\"macro stdmacro
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.ds Vn Version 1.2
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.ds Dt 6 March 1997
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.ds Re Release 1.2.0
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.ds Dp May 02 11:53
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.ds Dm 37 partialdi
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.ds Xs 56621 5 partialdisk.gl
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.TH GLUPARTIALDISK 3G
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.SH NAME
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.B "gluPartialDisk
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\- draw an arc of a disk
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.SH C SPECIFICATION
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void \f3gluPartialDisk\fP(
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GLUquadric* \fIquad\fP,
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.nf
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.ta \w'\f3void \fPgluPartialDisk( 'u
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GLdouble \fIinner\fP,
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GLdouble \fIouter\fP,
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GLint \fIslices\fP,
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GLint \fIloops\fP,
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GLdouble \fIstart\fP,
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GLdouble \fIsweep\fP )
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.fi
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.EQ
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delim $$
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.EN
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.SH PARAMETERS
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.TP \w'\fIslices\fP\ \ 'u
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\f2quad\fP
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Specifies a quadrics object (created with \%\f3gluNewQuadric\fP).
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.TP
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\f2inner\fP
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Specifies the inner radius of the partial disk (can be 0).
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.TP
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\f2outer\fP
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Specifies the outer radius of the partial disk.
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.TP
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\f2slices\fP
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Specifies the number of subdivisions around the \f2z\fP axis.
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.TP
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\f2loops\fP
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Specifies the number of concentric rings about the origin into which
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the partial disk is subdivided.
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.TP
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\f2start\fP
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Specifies the starting angle, in degrees, of the disk portion.
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.TP
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\f2sweep\fP
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Specifies the sweep angle, in degrees, of the disk portion.
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.SH DESCRIPTION
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\%\f3gluPartialDisk\fP renders a partial disk on the $ z ~=~ 0 $ plane. A partial disk is
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similar to a full disk, except that only the subset of the disk from
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\f2start\fP through \f2start\fP + \f2sweep\fP is included (where 0 degrees is along the
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+\f2y\f axis,
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90 degrees along the +\f2x\fP axis, 180 degrees along the \-\f2y\fP axis, and
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270 degrees along the \-\f2x\fP axis).
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.P
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The partial disk has a radius of
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\f2outer\fP, and contains a concentric circular hole with a radius
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of \f2inner\fP. If \f2inner\fP is 0, then no hole is generated. The partial disk is
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subdivided around the \f2z\fP axis into slices (like pizza slices), and also
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about the \f2z\fP axis into rings
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(as specified by \f2slices\fP and \f2loops\fP, respectively).
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.P
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With respect to orientation, the +\f2z\fP
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side of the partial disk is considered to
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be outside (see \%\f3gluQuadricOrientation\fP).
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This means that if the
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orientation is set to \%\f3GLU_OUTSIDE\fP, then any normals generated
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point along the +\f2z\fP axis. Otherwise, they point along the \-\f2z\fP
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axis.
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.P
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If texturing is turned on (with \%\f3gluQuadricTexture\fP), texture
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coordinates are generated
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linearly such that where $ r ~=~ "outer" $, the value at (\f2r\fP, 0, 0) is
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(1.0, 0.5), at (0, \f2r\fP, 0) it is (0.5, 1.0), at (\-\f2r\fP, 0, 0)
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it is (0.0, 0.5), and
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at (0, \-\f2r\fP, 0) it is (0.5, 0.0).
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.SH SEE ALSO
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\%\f3gluCylinder(3G)\fP, \%\f3gluDisk(3G)\fP, \%\f3gluNewQuadric(3G)\fP, \%\f3gluQuadricOrientation(3G)\fP,
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\%\f3gluQuadricTexture(3G)\fP,
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\%\f3gluSphere(3G)\fP
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