1CUFY(3NCARG)                     NCAR GRAPHICS                    CUFY(3NCARG)
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NAME

6       CUFY - Converts from user coordinates to fractional coordinates.
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10SPPS_converters(3NCARG)          NCAR GRAPHICS         SPPS_converters(3NCARG)
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NAME

15       spps_converters - A set of functions, each of which transforms a
16       coordinate from one of the NCAR Graphics coordinate systems to another.
17       The complete list of functions is as follows:  CFUX, CFUY, CMFX, CMFY,
18       CMUX, CMUY, CPFX, CPFY, CPUX, CPUY, CUFX, CUFY, KFMX, KFMY, KFPX, KFPY,
19       KMPX, KMPY, KPMX, KPMY, KUMX, KUMY, KUPX, and KUPY.
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STATUS

22       Plotter Address Units (PAUs) and Metacode Units (MUs) are no longer
23       used in NCAR Graphics; thus, all functions with either an M or a P as
24       the second or third letter of the function name are considered
25       obsolete.
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27       The current recognized coordinate systems are GKS world coordinates,
28       GKS normalized device coordinates, NCAR Graphics fractional
29       coordinates, and NCAR Graphics user coordinates.  See the NCAR Graphics
30       document "NCAR Graphics Fundamentals, UNIX Version" for descriptions of
31       these coordinate systems.
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33       The following definitions of the PAU coordinate system and the MU
34       coordinate system are provided for the purpose of interpreting and
35       converting codes which use PAUs or MUs:
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37       The plotter coordinates of a point are integers IPX and IPY, where IPX
38       is between 1 and 2**MX and IPY is between 1 and 2**MY.  MX and MY are
39       internal parameters of SPPS; each has a default value of 10.  Values of
40       MX and MY can be set by calling the routines SETI or SETUSV and
41       retrieved by calling the routines GETSI or GETUSV.
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43       The metacode coordinates of a point are integers IMX and IMY between 0
44       and 32767 inclusive.  The area addressed is a square in a "metacode
45       space" that is usually mapped into a square subset of the addressable
46       area of the plotting device.  Metacode coordinates were used in calls
47       to the routine PLOTIT and are returned in calls to FL2INT.
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SYNOPSIS

50       Current:
51       X = CFUX (RX),  Y = CFUY(RY)
52       X = CUFX (RX),  Y = CUFY(RY)
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54       Obsolete:
55       X = CMUX (IX),  Y = CMUY(IY)
56       X = CPUX (IX),  Y = CPUY(IY)
57       X = CMFX (IX),  Y = CMFY(IY)
58       X = CPFX (IX),  Y = CPFY(IY)
59       I = KFMX (RX),  J = KFMY(RY)
60       I = KUMX (RX),  J = KUMY(RY)
61       I = KFPX (RX),  J = KFPY(RY)
62       I = KUPX (RX),  J = KUPY(RY)
63       I = KPMX (IX),  J = KPMY(IY)
64       I = KMPX (IX),  J = KMPY(IY)
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C-BINDING SYNOPSIS

67       #include <ncarg/ncargC.h>
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69       float c_cfux (float rx)
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71       float c_cfuy (float ry)
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73       float c_cufx (float rx)
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75       float c_cufy (float ry)
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DESCRIPTION

78       RX          (an input expression of type REAL) is an X coordinate in
79                   the coordinate system specified by the second letter of the
80                   function name.  In a reference to CFUX, RX is a fractional
81                   X coordinate; in a reference to CUFX, RX is a user X
82                   coordinate.
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84       RY          (an input expression of type REAL) is a Y coordinate in the
85                   coordinate system specified by the second letter of the
86                   function name.  In a reference to CFUY, RY is a fractional
87                   Y coordinate; in a reference to CUFY, RY is a user Y
88                   coordinate.
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90       IX and IY occur as arguments only in references to some of the obsolete
91       functions; they represent input expressions of type INTEGER, specifying
92       the X and Y coordinates of a point in either PAUs or MUs (depending on
93       the second letter of the function name).
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95       The first letter of the function name is a C if the result is of type
96       REAL and a K if the result is of type INTEGER (the latter only happens
97       for some of the obsolete ones).  This conforms to the usual FORTRAN
98       convention for implicit typing.
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100       The second letter of the function name specifies the coordinate system
101       of the argument.
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103       The third letter of the function name specifies the coordinate system
104       of the functional result.  In references to CFUX and CFUY, the result
105       is in the user system; in references to CUFX and CUFY, the result is in
106       the fractional system.
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108       The fourth letter of the function name is an X or a Y, depending on
109       whether an X or a Y coordinate is being converted.
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C-BINDING DESCRIPTION

112       The C-binding argument description is the same as the FORTRAN argument
113       description.
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EXAMPLES

116       Use the ncargex command to see the following relevant examples which
117       use coordinate converters: mpex10, cbex10, sfex02, epltch.
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119       The command "ncargex -n mpex10" will load the driver mpex10.f into your
120       current working directory where you can examine the file using a local
121       editor, or the UNIX more command.
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ACCESS

124       There were 24 conversion functions in the original set.  These
125       functions (12 for the X coordinate of a point, and 12 for the Y
126       coordinate), allowed one to convert between any combination of PAUs,
127       MUs, fractional coordinates, and user coordinates.  PAUs and MUs are
128       now obsolete; thus, only four of the conversion functions are still
129       pertinent:  CFUX and CFUY allow one to convert the X and Y coordinates
130       of a point from the fractional system to the user system, while CUFX
131       and CUFY do the opposite.
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133       To use any of the conversion routines, load the load the NCAR Graphics
134       libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.
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SEE ALSO

137       Online: cfux, cfuy, cmfx, cmfy, cmux, cmuy, cpfx, cpfy, cpux, cpuy,
138       cufx, cufy, kfmx, kfmy, kfpx, kfpy, kmpx, kmpy, kpmx, kpmy, kumx, kumy,
139       kupx, kupy, spps, ncarg_cbind
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141       Hardcopy: NCAR Graphics Fundamentals, UNIX Version; User's Guide for
142       NCAR GKS-0A Graphics
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145       Copyright (C) 1987-2009
146       University Corporation for Atmospheric Research
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148       The use of this Software is governed by a License Agreement.
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152UNIX                              March 1993           SPPS_converters(3NCARG)
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