glRect(3gl)

1GLRECT(3G)                                                          GLRECT(3G)
2
3
4

NAME

6       glRectd,  glRectf,  glRecti,  glRects,  glRectdv,  glRectfv,  glRectiv,
7       glRectsv - draw a rectangle
8
9

C SPECIFICATION

11       void glRectd( GLdouble x1,
12                     GLdouble y1,
13                     GLdouble x2,
14                     GLdouble y2 )
15       void glRectf( GLfloat x1,
16                     GLfloat y1,
17                     GLfloat x2,
18                     GLfloat y2 )
19       void glRecti( GLint x1,
20                     GLint y1,
21                     GLint x2,
22                     GLint y2 )
23       void glRects( GLshort x1,
24                     GLshort y1,
25                     GLshort x2,
26                     GLshort y2 )
27
28

PARAMETERS

30       x1, y1 Specify one vertex of a rectangle.
31
32       x2, y2 Specify the opposite vertex of the rectangle.
33

C SPECIFICATION

35       void glRectdv( const GLdouble *v1,
36                      const GLdouble *v2 )
37       void glRectfv( const GLfloat *v1,
38                      const GLfloat *v2 )
39       void glRectiv( const GLint *v1,
40                      const GLint *v2 )
41       void glRectsv( const GLshort *v1,
42                      const GLshort *v2 )
43
44

PARAMETERS

46       v1     Specifies a pointer to one vertex of a rectangle.
47
48       v2     Specifies a pointer to the opposite vertex of the rectangle.
49

DESCRIPTION

51       glRect supports efficient specification of  rectangles  as  two  corner
52       points.   Each rectangle command takes four arguments, organized either
53       as two consecutive pairs of (x,y) coordinates, or as  two  pointers  to
54       arrays,  each  containing  an  (x,y)  pair.  The resulting rectangle is
55       defined in the z = 0 plane.
56
57       glRect(x1, y1, x2, y2) is exactly equivalent to the following sequence:
58       glBegin(GL_POLYGON);   glVertex2(x1,  y1);  glVertex2(x2,  y1);  glVer‐
59       tex2(x2, y2); glVertex2(x1, y2); glEnd(); Note that if the second  ver‐
60       tex  is  above  and  to the right of the first vertex, the rectangle is
61       constructed with a counterclockwise winding.
62

ERRORS

64       GL_INVALID_OPERATION is generated if glRect  is  executed  between  the
65       execution of glBegin and the corresponding execution of glEnd.
66