Ubuntu Manpage: Areas_params - This document briefly describes all Areas parameters.

Provided by: libncarg-dev_6.3.0-6build1_amd64

NAME

       Areas_params - This document briefly describes all Areas parameters.

DESCRIPTION

Areas currently supports nine parameters. These parameters are useful mostly for debugging
Areas problems. The current values may be retrieved using one of the routines ARGETI or
ARGETR. Parameter values may be reset using the routine ARSETI or ARSETR; the parameter
'DI' is for retrieval only and may not be given a new value by the user.

The Areas parameter descriptions appear below in alphabetical order. Each description
begins with a line giving the parameter name and the intrinsic FORTRAN type of the
parameter.

'AL' - Real
Arrowhead Length. AL specifies the length of each arrowhead used on a debug plot
produced by ARDBPA. The value is interpreted as a fraction of the width of the
plotter frame. Using a value which is less than or equal to zero causes arrowheads
to be omitted. The default value is .008.

'AT' - Integer
Arithmetic Type flag. AT allows the user to specify the type of arithmetic Areas
is to use or to find out what type it decided to use. A call to set the value of
AT should precede any other call to an Areas routine (except, possibly, one to set
the value of LC) and it should only be done once. A call to get the value of AT
will either return the value you set or a value picked by Areas.

< 1 Areas decides what sort of arithmetic to use.

1 Real arithmetic is to be used.

2 Double-precision arithmetic is to be used.

3 Multiple-precision arithmetic is to be used and Areas is to choose the base
value.

> 3 Multiple-precision arithmetic is to be used and AT specifies the base value.
(For example, the value 100 specifies the use of base-100 multiple-precision
integer arithmetic.)

Default: 0

Note: You should use a nonzero value of AT only on the recommendation of an NCAR
consultant.

'AW' - Real
Arrowhead Width. AL specifies the half-width of each arrowhead used on a debug
plot produced by ARDBPA. The value is interpreted as a fraction of the width of the
plotter frame. Using a value which is less than or equal to zero causes arrowheads
to be omitted. The default value is .002.

'DB' - Integer
DeBug-plots flag. DB allows the user to study the area map.

0 Debugging turned off. This is the default.

> 0 Debugging is on. At selected break points, ARPRAM produces plots showing all
edge segments in the area map that belong to the edge group with group
identifier DB.

'DC' - Integer
Debug Colors index. ARDBPA uses color indices DC+1 through DC+5 for debug-plot
colors.

By default, DC=100, so ARDBPA defines and uses color indices 101 through 105.

'DI' - Integer
Direction Indicator flag. The value of DI is for retrieval only and cannot be set
by the user. A value returned for DI is meaningful only when the call to ARGETI
that retrieves it originates from the user-written routine (dummy argument "APR")
that is called by ARSCAM. It then gives you information about the area whose
polygonal boundary is defined by the values of APR's arguments. The two possible
values of DI are:

1 Edge of the area is given in counterclockwise order (with the interior to the
left).

2 Edge of the area is given in clockwise order (with the interior to the right).

'ID' - Real
Identifier Distance. ID specifies the distance from an arrow to a left or right
area identifier on a debug plot produced by ARDBPA. The value is interpreted as a
fraction of the width of the plotter frame. Using a value which is less than or
equal to zero causes area identifiers to be omitted. The default value is .004.

'IS' - Real
Identifier Size. IS specifies the size of the characters used to write an area
identifier on a debug plot produced by ARDBPA. The value is interpreted as a
fraction of the width of the plotter frame. Using a value which is less than or
equal to zero causes area identifiers to be omitted. The default value is .001.

'LC' - Integer
Largest Coordinate. LC lets you specify the largest coordinate allowed in an area
map. X and Y coordinates in an area map are represented by integers in the range
from 0 to LC, inclusive; the default value of LC is 1000000.

The minimum value allowed for LC is 1000; attempting to set LC<1000 gives it the
value 1000. The value of LC must not be greater than the largest integer on the
machine on which Areas is running; its value must also be exactly representable as
a real number on that machine.

A call to set the value of LC should precede any other call to an Areas routine and
should only be done once.

'RC' - Integer
Reconciling Conflicts in area-identifier information.

This is an array of 16 values, indexed by group identifier. To set all values in
the array to the same value "n", use "CALL ARSETI('RC',n)"; to set just the first
value in the array, use "CALL ARSETI('RC(1)',n)"; to set just the second value, use
"CALL ARSETI('RC(2)',n)"; and so on. You can call ARGETI to get the value of RC(1)
or RC(2) or RC(3), etc.; if you ask for the value of just RC, you will get the
value of RC(1).

RC(1) is associated with edge group 1, RC(2) with edge group 2, and so on. An edge
group with a group identifier greater than 16 is associated with RC(16).

When the set of possible area identifiers for a given area in a given group is
contradictory, some algorithm must be used to choose an identifier for the area.
The value of that element of RC that is associated with the group determines what
algorithm will be used, as follows:

0 The default scheme: If any of the possible area identifiers is negative, use
-1 as the identifier for the area. Otherwise, if none of the possible values
is non-zero, use a zero identifier. Otherwise, from among the non-zero
possibilities, use the one most recently seen by AREAS.

1 The set of possible identifiers is examined: Zeroes are ignored, negatives
are treated as -1's, and the value that occurs most frequently in the
resulting set is used as the identifier for the area.

2 Using RC = 2 is just like using RC = 1 except that zeroes are not ignored: the
area identifier used is simply the one that occurs most frequently in the set
of possibilities (all negatives being treated as -1's).

-1 Using RC = -1 is just like using RC = 1 except that, if there are any
negatives in the set of possible identifiers, a -1 is used.

-2 Using RC = -2 is just like using RC = 2 except that, if there are any
negatives in the set of possible identifiers, a -1 is used.

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.

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