NAME¶
RESET - The "super" version of RESET zeroes the internal integer array
used to detect crowded lines; other versions do nothing.
SYNOPSIS¶
CALL RESET
C-BINDING SYNOPSIS¶
#include <ncarg/ncargC.h>
void c_reset()
USAGE¶
The "super" version of the Dashline utility attempts to cull crowded
lines from the output picture. It does this using an internal integer array,
ISCREN, in which each bit used represents a single pixel in a square array of
1024x1024 pixels of the picture. Initially, all the bits must be set to zero
by calling the routine RESET. When a line segment is about to be drawn, an
appropriate set of bits in ISCREN (representing the pixels through which the
line segment passes) is examined; if any bit in that set is a 1, the line
segment is not drawn. Then, the bits representing the pixels in the immediate
vicinity of the line segment are set to 1, so as to prevent any subsequent
line segment from being drawn through the area.
As each label is drawn, the bits in ISCREN representing the area occupied by the
label are set to 1, as well, which prevents subsequent line segments from
being drawn through the label.
This culling process has the following implications for the user of the
"super" version of Dashline:
- •
- The routine RESET should be called at the beginning of each new picture.
If this is not done, each of a consecutive series of pictures will have
progressively more gaps where line segments have been culled.
- •
- More important lines should be drawn first, followed by less important
lines. For example, the "super" version of the routine CONREC
draws labeled contour lines first, followed by the contour lines halfway
in between the labeled lines, followed by the rest of the lines.
- •
- Because each line segment is either drawn in its entirety or not at all,
long straight line segments are broken into shorter pieces. The internal
parameter MLLINE determines how small the resulting pieces will be; you
may wish to reduce its value so that smaller pieces will be used.
EXAMPLES¶
Use the ncargex command to see the following relevant examples: tdashp, fdlsmth.
ACCESS¶
To use RESET or c_reset, load the NCAR Graphics libraries ncarg, ncarg_gks, and
ncarg_c, preferably in that order.
SEE ALSO¶
Online: dashline, dashline_params, curved, dashdb, dashdc, frstd, lastd, lined,
vectd, ncarg_cbind
Hardcopy: NCAR Graphics Contouring and Mapping Tutorial; NCAR Graphics
Fundamentals, UNIX Version; User's Guide for NCAR GKS-0A Graphics
COPYRIGHT¶
Copyright (C) 1987-2009
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.