Method render

CvPlot/examples/examples_core.cpp:297–301

    struct MyRect :public Drawable {
        cv::Rect2d _rect = cv::Rect2d(3, 4, 5, 6);
        void render(RenderTarget &renderTarget) override {
            auto p1 = renderTarget.project({ _rect.x, _rect.y });
            auto p2 = renderTarget.project({ _rect.x + _rect.width, _rect.y + _rect.height });
            cv::rectangle(renderTarget.innerMat(), cv::Rect2d(p1, p2), cv::Scalar(0, 0, 255), 3);
        }
        bool getBoundingRect(cv::Rect2d &rect) override {
            rect = _rect;
            return true;