source: issm/trunk/src/wrappers/Ll2xy/Ll2xy.cpp@ 13975

Last change on this file since 13975 was 13236, checked in by Mathieu Morlighem, 13 years ago

CHG: preparing files for python inclusion
File size: 3.3 KB
Line 
1/*\file Ll2xy.c
2 *\brief: lat/long to x/y coordinate mex module.
3 */
4#include "./Ll2xy.h"
5
6void Ll2xyUsage(void){/*{{{*/
7 _pprintLine_("Ll2xy - lat/long to x/y coordinate transformation module:");
8 _pprintLine_("");
9 _pprintLine_(" This module transforms lat/long to x/y coordinates.");
10 _pprintLine_("");
11 _pprintLine_(" Usage:");
12 _pprintLine_(" [x,y]=Ll2xy(lat,lon,sgn,'param name',param,...);");
13 _pprintLine_("");
14 _pprintLine_(" lat latitude coordinates (double vector)");
15 _pprintLine_(" lon longitude coordinates (double vector)");
16 _pprintLine_(" sgn sign for hemisphere (double, +1 (north) or -1 (south))");
17 _pprintLine_("");
18 _pprintLine_(" central_meridian central meridian (double, optional, but must specify with sp)");
19 _pprintLine_(" standard_parallel standard parallel (double, optional, but must specify with cm)");
20 _pprintLine_("");
21 _pprintLine_(" x x coordinates (double vector)");
22 _pprintLine_(" y y coordinates (double vector)");
23 _pprintLine_("");
24 _pprintLine_(" Examples:");
25 _pprintLine_(" [x,y]=Ll2xy(lat,lon, 1);");
26 _pprintLine_(" [x,y]=Ll2xy(lat,lon, 1,'central_meridian',45,'standard_parallel',70);");
27 _pprintLine_(" [x,y]=Ll2xy(lat,lon,-1,'central_meridian', 0,'standard_parallel',71);");
28 _pprintLine_("");
29}/*}}}*/
30WRAPPER(Ll2xy){
31
32 int i,verbose=1;
33
34 /*input: */
35 double *lat=NULL,*lon=NULL;
36 int nlat,nlon,ncoord;
37 int sgn;
38
39 Options* options=NULL;
40 double cm=0.,sp=0.;
41
42 /* output: */
43 double *x=NULL,*y=NULL;
44 int iret=0;
45
46 /*Boot module: */
47 MODULEBOOT();
48
49 /*checks on arguments on the matlab side: */
50 if (nlhs > NLHS) {
51 Ll2xyUsage(); _error_("Ll2xy usage error");
52 }
53 if (nrhs < NRHS) {
54 Ll2xyUsage(); _error_("Ll2xy usage error");
55 }
56
57 /*Input datasets: */
58 FetchData(&lat,&nlat,LAT_IN);
59 FetchData(&lon,&nlon,LON_IN);
60 FetchData(&sgn,SGN_IN);
61 FetchData(&options,NRHS,nrhs,prhs);
62
63 /* defaults are in Ll2xydef, so don't duplicate them here, and only use user values if both have been specified */
64 if(options->GetOption("central_meridian") || options->GetOption("standard_parallel")){
65 options->Get(&cm,"central_meridian");
66 if (verbose) _printLine_(" cm=" << cm);
67 options->Get(&sp,"standard_parallel");
68 if (verbose) _printLine_(" sp=" << sp);
69 }
70
71 /*some checks*/
72 if (verbose) _printLine_("Checking inputs:");
73 if (nlat != nlon){_error_("Must have same number of lat[" << nlat << "] and lon[" << nlon << "] coordinates.");}
74 else ncoord=nlat;
75 if (sgn != +1 && sgn != -1) _error_("Hemisphere sgn=" << sgn << " must be +1 (north) or -1 (south).");
76 if (fabs(cm) > 180.) _error_("Central meridian cm=" << cm << " must be between -180 (west) and +180 (east) degrees.");
77 if (sp < 0. || sp > 90.) _error_("Standard parallel sp=" << sp << " must be between 0 and 90 degrees (in specified hemisphere).");
78
79 x=(double*)mxMalloc(ncoord*sizeof(double));
80 y=(double*)mxMalloc(ncoord*sizeof(double));
81
82 /* Run core computations: */
83 if (options->GetOption("central_meridian") && options->GetOption("standard_parallel"))
84 iret=Ll2xyx(x,y,lat,lon,ncoord,sgn,cm,sp);
85 else
86 iret=Ll2xyx(x,y,lat,lon,ncoord,sgn);
87
88 /*Write data: */
89 WriteData(X_OUT,x,ncoord);
90 WriteData(Y_OUT,y,ncoord);
91
92 /*Clean-up*/
93 delete options;
94
95 /*end module: */
96 MODULEEND();
97}
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