ellipse.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::ellipse has two overloaded variants
    bool rrect_variant = rhs[1].isStruct();
    nargchk(rrect_variant ? ((nrhs%2)==0) : (nrhs>=3 && (nrhs%2)==1));

    // Option processing
    double angle = 0;
    double startAngle = 0;
    double endAngle = 360;
    Scalar color;
    vector<Vec4d> colors;
    int thickness = 1;
    int lineType = cv::LINE_8;
    int shift = 0;
    for (int i=(rrect_variant ? 2 : 3); i<nrhs; i+=2) {
        string key(rhs[i].toString());
        if (key == "Angle" && !rrect_variant)
            angle = rhs[i+1].toDouble();
        else if (key == "StartAngle" && !rrect_variant)
            startAngle = rhs[i+1].toDouble();
        else if (key == "EndAngle" && !rrect_variant)
            endAngle = rhs[i+1].toDouble();
        else 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" && !rrect_variant)
            shift = rhs[i+1].toInt();
        else
            mexErrMsgIdAndTxt("mexopencv:error",
                "Unrecognized option %s", key.c_str());
    }

    // Process
    Mat img(rhs[0].toMat());
    if (!rrect_variant) {
        Point center(rhs[1].toPoint());
        Size axes(rhs[2].toSize());
        ellipse(img, center, axes, angle, startAngle, endAngle,
            color, thickness, lineType, shift);
    }
    else {
        if (rhs[1].numel() == 1) {
            RotatedRect box(rhs[1].toRotatedRect());
            ellipse(img, box, color, thickness, lineType);
        }
        else {
            vector<RotatedRect> box(rhs[1].toVector<RotatedRect>());
            if (!colors.empty() && colors.size() != box.size())
                mexErrMsgIdAndTxt("mexopencv:error", "Length mismatch");
            for (size_t i = 0; i < box.size(); ++i)
                ellipse(img, box[i],
                    (colors.empty() ? color : Scalar(colors[i])),
                    thickness, lineType);
        }
    }
    plhs[0] = MxArray(img);
}