NAME¶
KUPY - Converts from user coordinates to plotter address unit coordinates.
NAME¶
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.
STATUS¶
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.
SYNOPSIS¶
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)
C-BINDING SYNOPSIS¶
#include <ncarg/ncargC.h>
float c_cfux (float rx)
float c_cfuy (float ry)
float c_cufx (float rx)
float c_cufy (float ry)
DESCRIPTION¶
- 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.
C-BINDING DESCRIPTION¶
The C-binding argument description is the same as the FORTRAN argument
description.
EXAMPLES¶
Use the ncargex command to see the following relevant examples which use
coordinate converters: mpex10, cbex10, 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.
ACCESS¶
There were or c_ere 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 any of these conversion routines, load the NCAR Graphics libraries ncarg,
ncarg_gks, and ncarg_c, preferably in that order.
SEE ALSO¶
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
COPYRIGHT¶
Copyright (C) 1987-2009
University Corporation for Atmospheric Research
The use of this Software is governed by a License Agreement.