NAME¶
ARDBPA - Produces a plot showing all of the edge segments in an area map that
have a specified group identifier IGRP; if IGRP is less than or equal to zero,
all groups are included. Such plots allow one to debug problems with an area
map.
SYNOPSIS¶
CALL ARDBPA (MAP,IGRP,LABEL)
C-BINDING SYNOPSIS¶
#include <ncarg/ncargC.h>
void c_ardbpa (int *map, int igrp, char *label)
DESCRIPTION¶
- MAP
- (an input/output array of type INTEGER) - An array containing an area map
that has at least been initialized by a call to ARINAM and to which edges
will probably have been added by calls to AREDAM.
Note: As part of initializing the area map, ARINAM stores the dimension of
MAP in MAP(1); therefore, the dimension does not have to be given as an
argument in calls to ARDBPA.)
- IGRP
- (an input expression of type INTEGER) - The group identifier of the group
that you want to examine. If IGRP is less than or equal to zero, edges
from all groups will be shown.
- LABEL
- (an input constant or variable of type CHARACTER) - The label you want put
on the plot.
C-BINDING DESCRIPTION¶
The C-binding argument descriptions are the same as the FORTRAN argument
descriptions.
USAGE¶
When ARDBPA is called, it draws the requested picture and then calls FRAME to
advance to a new frame.
By default, each edge segment in the plot appears in one of four different
colors, depending on whether the area identifiers to the left and right are
less than or equal to zero or greater than zero, as follows:
| Color |
Left area identifier |
Right area identifier |
| ----- |
-------------------- |
--------------------- |
| Magenta |
Less than or equal to 0 |
Less than or equal to 0 |
| Yellow |
Less than or equal to 0 |
Greater than 0 |
| Cyan |
Greater than 0 |
Less than or equal to 0 |
| White |
Greater than 0 |
Greater than 0 |
In some cases you may notice gray lines in your plot. This means that the same
edge occurs in more than one group. In all but one of those groups, Areas
negates the group identifier for the edge in the area map. This allows Areas
to include the edge when it is looking at a particular group (as in ARPRAM),
but omit it when it is looking at the union of all the groups (as in ARSCAM).
Color indices DC+1 through DC+5 are used for the required colors. The default
value of DC is 100, so, by default, ARDBPA redefines color indices 101 through
105. If this would result in colors that you have defined being redefined, you
should change the value of DC to something else.
Nominally, each edge segment is shown with an arrowhead, indicating the order in
which the points defining the edge segment occur in the area map and therefore
which side of the edge segment is to the left and which side is to the right.
In regions where putting an arrowhead on each edge segment would result in too
much clutter, some of them may be omitted.
The left and right area identifiers for each edge segment are written in the
appropriate positions relative to the edge segment. Also, if IGRP is less than
or equal to zero, the group identifier for each edge segment is written on the
segment itself. These identifiers are intentionally written using very small
characters; the idea is that you can look at the whole plot to get some idea
of possible problem regions; when such a region is found, you can enlarge it,
using the "zoom" capability of "idt", for a closer look;
at that point, the area identifiers become readable.
If ARDBPA is used for a complicated area map, the amount of output can be very
large.
EXAMPLES¶
Use the ncargex command to see the following relevant examples: arex01, cardb2.
ACCESS¶
To use ARDBPA or c_ardbpa, load the NCAR Graphics libraries ncarg, ncarg_gks,
and ncarg_c, preferably in that order.
SEE ALSO¶
Online: areas, areas_params, ardrln, aredam, argeti, argetr, argtai, arinam,
armvam, arpram, arscam, arseti, arsetr, ncarg_cbind
Hardcopy: NCAR Graphics Contouring and Mapping Tutorial
COPYRIGHT¶
Copyright (C) 1987-2009
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.
