arrowedLine.cpp

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#include "mexopencv.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>=3 && (nrhs%2)==1 && nlhs<=1);

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

    // Option processing
    Scalar color;
    int thickness = 1;
    int lineType = cv::LINE_8;
    int shift = 0;
    double tipLength = 0.1;
    for (int i=3; i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key=="Color")
            color = rhs[i+1].toScalar();
        else if (key=="Thickness")
            thickness = (rhs[i+1].isChar()) ?
                ThicknessType[rhs[i+1].toString()] : rhs[i+1].toInt();
        else if (key=="LineType")
            lineType = (rhs[i+1].isChar()) ?
                LineType[rhs[i+1].toString()] : rhs[i+1].toInt();
        else if (key=="Shift")
            shift = rhs[i+1].toInt();
        else if (key=="TipLength")
            tipLength = rhs[i+1].toDouble();
        else
            mexErrMsgIdAndTxt("mexopencv:error","Unrecognized option");
    }

    // Process
    Mat img(rhs[0].toMat());
    Point pt1(rhs[1].toPoint()),
          pt2(rhs[2].toPoint());
    arrowedLine(img, pt1, pt2, color, thickness, lineType, shift, tipLength);
    plhs[0] = MxArray(img);
}