On Sat, 13 Mar 1999, njyzh wrote:
> I think this problem is simple but I could not find any documentation
> about it, i.e. what do these functions "cfux" "cfuy" "cpux" "cpuy"
> "wtstr" do?
From the man pages:
% man spps_converters
SPPS_converters(3NCARG) NCAR GRAPHICS SPPS_converters(3NCARG)
NNNNAAAAMMMMEEEE
spps_converters - A set of functions, each of which
transforms a coordinate from one of the NCAR Graphics
coordinate systems to another. The complete list of
functions is as follows: CFUX, CFUY, CMFX, CMFY, CMUX,
CMUY, CPFX, CPFY, CPUX, CPUY, CUFX, CUFY, KFMX, KFMY, KFPX,
KFPY, KMPX, KMPY, KPMX, KPMY, KUMX, KUMY, KUPX, and KUPY.
SSSSTTTTAAAATTTTUUUUSSSS
Plotter Address Units (PAUs) and Metacode Units (MUs) are no
longer used in NCAR Graphics; thus, all functions with
either an M or a P as the second or third letter of the
function name are considered obsolete.
The current recognized coordinate systems are GKS world
coordinates, GKS normalized device coordinates, NCAR
Graphics fractional coordinates, and NCAR Graphics user
coordinates. See the NCAR Graphics document "NCAR Graphics
Fundamentals, UNIX Version" for descriptions of these
coordinate systems.
The following definitions of the PAU coordinate system and
the MU coordinate system are provided for the purpose of
interpreting and converting codes which use PAUs or MUs:
The plotter coordinates of a point are integers IPX and IPY,
where IPX is between 1 and 2**MX and IPY is between 1 and
2**MY. MX and MY are internal parameters of SPPS; each has
a default value of 10. Values of MX and MY can be set by
calling the routines SETI or SETUSV and retrieved by calling
the routines GETSI or GETUSV.
The metacode coordinates of a point are integers IMX and IMY
between 0 and 32767 inclusive. The area addressed is a
square in a "metacode space" that is usually mapped into a
square subset of the addressable area of the plotting
device. Metacode coordinates were used in calls to the
routine PLOTIT and are returned in calls to FL2INT.
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
Current:
X = CFUX (RX), Y = CFUY(RY)
X = CUFX (RX), Y = CUFY(RY)
Obsolete:
X = CMUX (IX), Y = CMUY(IY)
X = CPUX (IX), Y = CPUY(IY)
X = CMFX (IX), Y = CMFY(IY)
X = CPFX (IX), Y = CPFY(IY)
I = KFMX (RX), J = KFMY(RY)
I = KUMX (RX), J = KUMY(RY)
I = KFPX (RX), J = KFPY(RY)
I = KUPX (RX), J = KUPY(RY)
I = KPMX (IX), J = KPMY(IY)
I = KMPX (IX), J = KMPY(IY)
CCCC----BBBBIIIINNNNDDDDIIIINNNNGGGG SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
#include <ncarg/ncargC.h>
float c_cfux (float rx)
float c_cfuy (float ry)
float c_cufx (float rx)
float c_cufy (float ry)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
RX (an input expression of type REAL) is an X
coordinate in the coordinate system specified by
the second letter of the function name. In a
reference to CFUX, RX is a fractional X
coordinate; in a reference to CUFX, RX is a user
X coordinate.
RY (an input expression of type REAL) is a Y
coordinate in the coordinate system specified by
the second letter of the function name. In a
reference to CFUY, RY is a fractional Y
coordinate; in a reference to CUFY, RY is a user
Y coordinate.
IX and IY occur as arguments only in references to some of
the obsolete functions; they represent input expressions of
type INTEGER, specifying the X and Y coordinates of a point
in either PAUs or MUs (depending on the second letter of the
function name).
The first letter of the function name is a C if the result
is of type REAL and a K if the result is of type INTEGER
(the latter only happens for some of the obsolete ones).
This conforms to the usual FORTRAN convention for implicit
typing.
The second letter of the function name specifies the
coordinate system of the argument.
The third letter of the function name specifies the
coordinate system of the functional result. In references
to CFUX and CFUY, the result is in the user system; in
references to CUFX and CUFY, the result is in the fractional
system.
The fourth letter of the function name is an X or a Y,
depending on whether an X or a Y coordinate is being
converted.
CCCC----BBBBIIIINNNNDDDDIIIINNNNGGGG DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
The C-binding argument description is the same as the
FORTRAN argument description.
EEEEXXXXAAAAMMMMPPPPLLLLEEEESSSS
Use the ncargex command to see the following relevant
examples which use coordinate converters: mpex10, cbex01,
sfex02, epltch.
The command "ncargex -n mpex10" will load the driver
mpex10.f into your current working directory where you can
examine the file using a local editor, or the UNIX more
command.
AAAACCCCCCCCEEEESSSSSSSS
There were 24 conversion functions in the original set.
These functions (12 for the X coordinate of a point, and 12
for the Y coordinate), allowed one to convert between any
combination of PAUs, MUs, fractional coordinates, and user
coordinates. PAUs and MUs are now obsolete; thus, only four
of the conversion functions are still pertinent: CFUX and
CFUY allow one to convert the X and Y coordinates of a point
from the fractional system to the user system, while CUFX
and CUFY do the opposite.
To use one of these conversion routines, load the NCAR
Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably
in that order.
SSSSEEEEEEEE AAAALLLLSSSSOOOO
Online: cfux, cfuy, cmfx, cmfy, cmux, cmuy, cpfx, cpfy,
cpux, cpuy, cufx, cufy, kfmx, kfmy, kfpx, kfpy, kmpx, kmpy,
kpmx, kpmy, kumx, kumy, kupx, kupy, spps, ncarg_cbind
Hardcopy: NCAR Graphics Fundamentals, UNIX Version; User's
Guide for NCAR GKS-0A Graphics
CCCCOOOOPPPPYYYYRRRRIIIIGGGGHHHHTTTT
Copyright (C) 1987-1998
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.
% man wtstr
WTSTR(3NCARG) NCAR GRAPHICS WTSTR(3NCARG)
NNNNAAAAMMMMEEEE
WTSTR - draws a specified text string at a specified
position in the user coordinate system. The call has
arguments specifying the size, orientation, and centering of
the string.
SSSSTTTTAAAATTTTUUUUSSSS
WTSTR specifies character sizes in Plotter Address Units
(PAUs), which are no longer used in NCAR Graphics; thus,
WTSTR is considered an obsolete routine.
The current recognized coordinate systems are GKS world
coordinates, GKS normalized device coordinates, NCAR
Graphics fractional coordinates, and NCAR Graphics user
coordinates. See the NCAR Graphics document "NCAR Graphics
Fundamentals, UNIX Version" for a description of these
coordinate systems.
WTSTR continues to be provided for compatibility of early
NCAR Graphics codes. If you are writing new code, we
suggest that you use the more general text writing routines
of the Plotchar utility: PLCHLQ, PLCHMQ, and PLCHHQ.
The following definition of the PAU Coordinate System is
included for the purpose of interpreting and converting PAU
codes:
The plotter coordinates of a point are integers IPX and IPY,
where IPX is between 1 and 2**MX and IPY is between 1 and
2**MY. MX and MY are internal parameters of SPPS; each has
the default value 10. Values of MX and MY can be set by the
routine SETI and retrieved by the routine GETSI.
SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
CALL WTSTR(PX,PY,CH,IS,IO,IC)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
PX (an input expression of type REAL) defines the X
user coordinate where the text string is to be
drawn.
PY (an input expression of type REAL) defines the Y
user coordinate where the text string is to be
drawn.
CH (an input constant or variable of type
CHARACTER) is the text string to be drawn.
IS (an input expression of type INTEGER) specifies
the character width in plotter address units
(PAUs).
IO (an input expression of type INTEGER) specifies
the rotation angle of the text string. IO is
measured in degrees counter-clockwise from a
horizontal orientation.
IC (an input expression of type INTEGER) specifies
the centering option, as follows:
<0 (PX,PY) will be in the vertical center of
the left edge of the leftmost character in
the original horizontal string.
=0 (PX,PY) will be in the center of the text
extent rectangle.
>0 (PX,PY) will be in the vertical center of
the right edge of the rightmost character in
the original horizontal string.
A call to WTSTR causes the SPPS polyline buffer to be
flushed and leaves the "pen" (for subsequent calls to
FRSTPT, VECTOR, PLOTIF, and PLOTIT) at the location (PX,PY).
AAAACCCCCCCCEEEESSSSSSSS
To use WTSTR, load the NCAR Graphics libraries ncarg,
ncarg_gks, and ncarg_c, preferably in that order.
SSSSEEEEEEEE AAAALLLLSSSSOOOO
Online: gtx, gstxal, gstxp, gstxfp, gschh, gschsp, gschup,
gschxp, gscr, gstxci, spps, plotchar, plchhq, plchmq,
plchlq, pwrit, plotif, seti, getsi
Hardcopy: NCAR Graphics Fundamentals, UNIX Version; User's
Guide for NCAR GKS-0A Graphics
CCCCOOOOPPPPYYYYRRRRIIIIGGGGHHHHTTTT
Copyright (C) 1987-1998
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.
Andy Mai
Phone: 303-497-1391
Email: mai AT unknown
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