Forces the system to draw accurate concave polygons.
FORTRAN (libfgl.a)
void concave(Int32 bool)
SUBROUTINE CONCAV(bool) LOGICAL bool
The concave subroutine forces the system to draw accurate concave polygons. When the bool parameter is True (1), the system draws accurate concave polygons. When the value of the bool parameter is False (0) (the default), the results of drawing a concave polygon are unpredictable.
The system draws polygons significantly faster if checking for concavity is turned off. Therefore, unless you specifically want to draw concave polygons, you should generally operate with the bool parameter set to False.
This subroutine is part of GL in the AIXwindows Environment/6000 Version 1, Release 2 with AIXwindows/3D Feature.
On the POWERgraphics GXT1000, the value of the concave flag is ignored when drawing into the overlay planes.
If the concave flag has been set to TRUE, then the GXT1000 limits the number of vertices that can appear between a bgnline and endline pair to 255 vertices. Otherwise, an unlimited number of vertices can be specified.
| /usr/include/gl/gl.h | Contains C language constant and variable type definitions for GL. |
| /usr/include/gl/fgl.h | Contains FORTRAN constant and variable type definitions for GL. |
Drawing a vertex-based polygon with the bgnpolygon subroutine.
Specifying the next point in a polygon with the pdr subroutine.
Specifying the starting point for a polygon with the pmv subroutine.
Drawing a filled polygon with the polf subroutine.
Drawing a polygon with the poly subroutine.
AIX Graphics Library Overview, Setting Pipeline Options, Drawing Rectangles, Circles, Arcs, and Polygons.