arcLength.cpp

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#include "mexopencv.hpp"
#include "opencv2/imgproc.hpp"
using namespace std;
using namespace cv;

void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
{
    // Check the number of arguments
    nargchk(nrhs>=1 && (nrhs%2)==1 && nlhs<=1);

    // Argument vector
    vector<MxArray> rhs(prhs, prhs+nrhs);

    // Option processing
    bool closed = false;
    for (int i=1; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "Closed")
            closed = rhs[i+1].toBool();
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    double d = 0;
    if (rhs[0].isNumeric()) {
        Mat curve(rhs[0].toMat(CV_32F));
        d = arcLength(curve, closed);
    }
    else if (rhs[0].isCell()) {
        vector<Point2f> curve(rhs[0].toVector<Point2f>());
        d = arcLength(curve, closed);
    }
    else
        mexErrMsgIdAndTxt("mexopencv:error", "Invalid points argument");
    plhs[0] = MxArray(d);
}