118 lines
2.6 KiB
Plaintext
118 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 24 September 1999
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.ds Re Release 1.2.1
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.ds Dp Jan 14 18:30
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.ds Dm 01 rect.gl -
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.ds Xs 25554 4 rect.gl
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.TH GLRECT 3G
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.SH NAME
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.B "glRectd, glRectf, glRecti, glRects, glRectdv, glRectfv, glRectiv, glRectsv
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\- draw a rectangle
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.SH C SPECIFICATION
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void \f3glRectd\fP(
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GLdouble \fIx1\fP,
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.nf
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.ta \w'\f3void \fPglRectd( 'u
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GLdouble \fIy1\fP,
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GLdouble \fIx2\fP,
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GLdouble \fIy2\fP )
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.fi
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void \f3glRectf\fP(
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GLfloat \fIx1\fP,
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.nf
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.ta \w'\f3void \fPglRectf( 'u
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GLfloat \fIy1\fP,
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GLfloat \fIx2\fP,
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GLfloat \fIy2\fP )
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.fi
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void \f3glRecti\fP(
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GLint \fIx1\fP,
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.nf
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.ta \w'\f3void \fPglRecti( 'u
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GLint \fIy1\fP,
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GLint \fIx2\fP,
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GLint \fIy2\fP )
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.fi
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void \f3glRects\fP(
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GLshort \fIx1\fP,
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.nf
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.ta \w'\f3void \fPglRects( 'u
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GLshort \fIy1\fP,
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GLshort \fIx2\fP,
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GLshort \fIy2\fP )
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.fi
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.SH PARAMETERS
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.TP \w'\f2x1\fP\ \f2y1\fP\ \ 'u
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\f2x1\fP, \f2y1\fP
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Specify one vertex of a rectangle.
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.TP
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\f2x2\fP, \f2y2\fP
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Specify the opposite vertex of the rectangle.
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.SH C SPECIFICATION
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void \f3glRectdv\fP(
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const GLdouble \fI*v1\fP,
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.nf
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.ta \w'\f3void \fPglRectdv( 'u
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const GLdouble \fI*v2\fP )
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.fi
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void \f3glRectfv\fP(
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const GLfloat \fI*v1\fP,
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.nf
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.ta \w'\f3void \fPglRectfv( 'u
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const GLfloat \fI*v2\fP )
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.fi
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void \f3glRectiv\fP(
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const GLint \fI*v1\fP,
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.nf
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.ta \w'\f3void \fPglRectiv( 'u
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const GLint \fI*v2\fP )
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.fi
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void \f3glRectsv\fP(
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const GLshort \fI*v1\fP,
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.nf
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.ta \w'\f3void \fPglRectsv( 'u
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const GLshort \fI*v2\fP )
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.fi
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.BP
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.SH PARAMETERS
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.TP
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\f2v1\fP
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Specifies a pointer to one vertex of a rectangle.
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.TP
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\f2v2\fP
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Specifies a pointer to the opposite vertex of the rectangle.
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.SH DESCRIPTION
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\%\f3glRect\fP supports efficient specification of rectangles as two corner points.
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Each
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rectangle command takes four arguments,
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organized either as two consecutive pairs of (\f2x\fP,\f2y\fP) coordinates,
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or as two pointers to arrays,
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each containing an (\f2x\fP,\f2y\fP) pair.
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The resulting rectangle is defined in the \f2z\fP = 0 plane.
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.P
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\%\f3glRect\fP(\f2x1\fP, \f2y1\fP, \f2x2\fP, \f2y2\fP)
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is exactly equivalent to the following sequence:
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.Ex 6
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glBegin(\%\f3GL_POLYGON\fP);
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glVertex2(\f2x1\fP, \f2y1\fP);
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glVertex2(\f2x2\fP, \f2y1\fP);
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glVertex2(\f2x2\fP, \f2y2\fP);
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glVertex2(\f2x1\fP, \f2y2\fP);
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glEnd();
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.Ee
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Note that if the second vertex is above and to the right of the first vertex,
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the rectangle is constructed with a counterclockwise winding.
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.SH ERRORS
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\%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glRect\fP
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is executed between the execution of \%\f3glBegin\fP
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and the corresponding execution of \%\f3glEnd\fP.
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.SH SEE ALSO
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\%\f3glBegin(3G)\fP,
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\%\f3glVertex(3G)\fP
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