rectangle.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>=2 && nlhs<=1);

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

    // cv::rectangle has two overloaded variants
    bool rect_variant = (rhs[1].isCell() || (rhs[1].numel() % 4)==0);
    nargchk(rect_variant ? ((nrhs%2)==0) : (nrhs>=3 && (nrhs%2)==1));

    // Option processing
    Scalar color;
    vector<Vec4d> colors;
    int thickness = 1;
    int lineType = cv::LINE_8;
    int shift = 0;
    for (int i=(rect_variant ? 2 : 3); i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "Color")
            color = (rhs[i+1].isChar()) ?
                ColorType[rhs[i+1].toString()] : rhs[i+1].toScalar();
        else if (key == "Colors")
            colors = MxArrayToVectorVec<double,4>(rhs[i+1]);
        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
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat img(rhs[0].toMat());
    if (!rect_variant) {
        Point pt1(rhs[1].toPoint()),
              pt2(rhs[2].toPoint());
        rectangle(img, pt1, pt2, color, thickness, lineType, shift);
    }
    else {
        if (rhs[1].isNumeric() && rhs[1].numel() == 4) {
            Rect r(rhs[1].toRect());
            rectangle(img, r, color, thickness, lineType, shift);
        }
        else {
            vector<Rect> r(rhs[1].toVector<Rect>());
            if (!colors.empty() && colors.size() != r.size())
                mexErrMsgIdAndTxt("mexopencv:error", "Length mismatch");
            for (size_t i = 0; i < r.size(); ++i)
                rectangle(img, r[i],
                    (colors.empty() ? color : Scalar(colors[i])),
                    thickness, lineType, shift);
        }
    }
    plhs[0] = MxArray(img);
}