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/**
* \file polygonarea.cpp
* \brief Matlab mex file for computing the area of a geodesicpolygon
*
* Copyright (c) Charles Karney (2011) <charles@karney.com> and licensed
* under the MIT/X11 License. For more information, see
* http://geographiclib.sourceforge.net/
**********************************************************************/
// Compile in Matlab with
// [Unix]
// mex -I/usr/local/include -L/usr/local/lib -Wl,-rpath=/usr/local/lib
// -lGeographic polygonarea.cpp
// [Windows]
// mex -I../include -L../windows/Release
// -lGeographic polygonarea.cpp
#include <algorithm>
#include <GeographicLib/PolygonArea.hpp>
#include <mex.h>
using namespace std;
using namespace GeographicLib;
void mexFunction( int nlhs, mxArray* plhs[],
int nrhs, const mxArray* prhs[] ) {
if (nrhs < 1)
mexErrMsgTxt("One input argument required.");
else if (nrhs > 3)
mexErrMsgTxt("More than three input arguments specified.");
else if (nrhs == 2)
mexErrMsgTxt("Must specify flattening with the major radius.");
else if (nlhs > 2)
mexErrMsgTxt("More than two output arguments specified.");
if (!( mxIsDouble(prhs[0]) && !mxIsComplex(prhs[0]) ))
mexErrMsgTxt("latlong coordinates are not of type double.");
if (mxGetN(prhs[0]) != 2)
mexErrMsgTxt("latlong coordinates must be M x 2 matrix.");
double a = Constants::WGS84_a<double>(), f = Constants::WGS84_f<double>();
if (nrhs == 3) {
if (!( mxIsDouble(prhs[1]) && !mxIsComplex(prhs[1]) &&
mxGetNumberOfElements(prhs[1]) == 1 ))
mexErrMsgTxt("Major radius is not a real scalar.");
a = mxGetScalar(prhs[1]);
if (!( mxIsDouble(prhs[2]) && !mxIsComplex(prhs[2]) &&
mxGetNumberOfElements(prhs[2]) == 1 ))
mexErrMsgTxt("Flattening is not a real scalar.");
f = mxGetScalar(prhs[2]);
}
mwSize m = mxGetM(prhs[0]);
double* lat = mxGetPr(prhs[0]);
double* lon = lat + m;
plhs[0] = mxCreateDoubleMatrix(1, 1, mxREAL);
double* area = mxGetPr(plhs[0]);
double* perimeter = NULL;
bool perimeterp = nlhs == 2;
if (perimeterp) {
plhs[1] = mxCreateDoubleMatrix(1, 1, mxREAL);
perimeter = mxGetPr(plhs[1]);
}
try {
const Geodesic g(a, f);
PolygonArea p(g, false);
for (mwIndex i = 0; i < m; ++i) {
if (!(abs(lat[i]) <= 90))
throw GeographicErr("Invalid latitude");
if (!(lon[i] >= -540 || lon[i] < 540))
throw GeographicErr("Invalid longitude");
p.AddPoint(lat[i], lon[i]);
}
double tp, ta;
p.Compute(false, true, tp, ta);
*area = ta;
if (perimeterp) *perimeter = tp;
}
catch (const std::exception& e) {
mexErrMsgTxt(e.what());
}
}
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