Es++ Sample: PerspectiveMapping


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 *  PerspectiveMapping.cpp
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//
#include <es++/gtkmm-3.0/Application.h>
#include <es++/gtkmm-3.0/ApplicationView.h>
#include <es++/gtkmm-3.0/Label.h>
#include <es++/gtkmm-3.0/LabeledTrackBar.h>
#include <es++/gtkmm-3.0/FileOpenDialog.h>
#include <es++/opencv-4.0/OpenCVScrolledImageView.h>
#include <es++/opencv-4.0/OpenCVScaleComboBox.h>

using namespace Gtk;

namespace Es {

class MainView :public Es::ApplicationView {
private:
  /////////////////////////////////////////////////////// 
  //Inner classes start.

  class OriginalImageView :public Es::OpenCVScrolledImageView {
  public:
    OriginalImageView()
    {
    }    
    void rescale(int scaling_ratio)
    {
      OpenCVScrolledImageView::scaleImage(scaling_ratio);
    }
  };

  class TransformedImageView :public Es::OpenCVScrolledImageView {
  private:
    cv::Mat transformed_image;

  public:
    TransformedImageView()
    {
    }

    void loadImage(const std::string& filename, 
        int imageLoadingFlag= CV_LOAD_IMAGE_COLOR,
                int scaling_ratio=100)
    {
      OpenCVScrolledImageView::loadImage(filename, imageLoadingFlag,
                                scaling_ratio);
 
      cv::Mat& original_image = getOriginalImage();
      transformed_image  = original_image.clone();
      scaleImage(transformed_image, scaling_ratio);
      
    }    

    void transform(int degree, int scaling_ratio)
    {
      cv::Mat& original_image = getOriginalImage();

      double radian = (double)degree*3.141592/180.0;

      float w = (float)original_image.cols;
      float h = (float)original_image.rows;

      float co = cos(radian);
      float si = sin(radian);

      const cv::Point2f rect[]={
              cv::Point2f( w/2.0*co, (h/2.0)*si),
              cv::Point2f( (w/2.0)*co,   (h/2.0)*si),
              cv::Point2f( w*co,   h*si),
              cv::Point2f( (w/2.0)*co,  h*si)};

      const cv::Mat homography = cv::getPerspectiveTransform(rect, rect);

      cv::warpPerspective(original_image, transformed_image, 
                     homography, original_image.size());

      scaleImage(transformed_image, scaling_ratio);
    } 

    void rescale(int scaling_ratio)
    {
      OpenCVScrolledImageView::scaleImage(transformed_image, scaling_ratio);
    }
  };
  // Inner classes end.
  /////////////////////////////////////////////////////// 

  Es::Label              filepath;

  Es::HorizontalLayout   horiz_layout;

  Es::VerticalLayout     control_pane;

  OriginalImageView      original_image;

  TransformedImageView   transformed_image;

  int                    loading_flag;

  Es::OpenCVScaleComboBox scale_combobox;

  Es::LabeledTrackBar     angle_trackbar;
  int                     angle;
 
  int                     scaling_ratio;  //Percentage.
  static const int        CONTROLPANE_WIDTH = 180;

  std::string             filename;
 
  Es::FileOpenDialog      file_dialog;

public:
  //////////////////////////////////////////////
  //Constructor
  //
  MainView(Es::Application& applet, 
          std::string&      name,
          Es::Args&         args)
  :ApplicationView(applet, name, args)
  ,scaling_ratio(100)  //100%
  ,file_dialog(*this, Es::FileOpenDialog::IMAGE_FILES)
  {
    int w = (int)args.get(XmNwidth);
    int h = (int)args.get(XmNheight);

    int ratio = (int)args.get(XmNscalingRatio);

    scaling_ratio = OpenCVImageView::validateScale(ratio);

    Es::MainLayout& main_layout = get_main_layout();

    main_layout.pack_start(filepath, FALSE, FALSE, 0);

    main_layout.pack_start(horiz_layout);

    filename = "../../images/SlantHelloWorld2.png";

    filepath.set_label(filename);
    int ww = (w - CONTROLPANE_WIDTH)/2;

    filepath.set_size_request(w, 30);
    original_image.set_size_request(ww, h);
    transformed_image.set_size_request(ww, h);
    control_pane.set_size_request( CONTROLPANE_WIDTH, h);

    horiz_layout.pack_start(original_image);
    horiz_layout.pack_start(transformed_image);

    horiz_layout.pack_start(control_pane, FALSE, FALSE, 0);

    scale_combobox.set_selection(scaling_ratio);
    angle = 10;
    angle_trackbar.set_label("Angle: [0, 360]");
    angle_trackbar.configure_adjuster(10.0f, 0.0f, 360.0f);
    angle_trackbar.set_value_changed_callback(
            sigc::mem_fun(*this, &MainView::trackbar_value_changed) );

    control_pane.set_spacing(20);
    control_pane.pack_start(scale_combobox, Gtk::PACK_SHRINK);
    control_pane.pack_start(angle_trackbar, Gtk::PACK_SHRINK);

    scale_combobox.set_changed_callback(
             sigc::mem_fun(*this, &MainView::scale_changed) );

    loading_flag = IMREAD_COLOR;
    original_image.loadImage(filename, loading_flag, scaling_ratio);
    transformed_image.loadImage(filename, loading_flag, scaling_ratio);

    transformed_image.transform(angle, scaling_ratio);

    show_all();
  }

  void scale_changed()
  {
    std::string scale = scale_combobox.get_active_text();
    printf("scale_changed %s\n", scale.c_str());
    scaling_ratio = scale_combobox.get_selection();

    original_image.rescale(scaling_ratio);
    transformed_image.rescale(scaling_ratio);
  }

  void trackbar_value_changed()
  {
    angle = (int)angle_trackbar.get_value();
    
    transformed_image.transform(angle, scaling_ratio);
  }

  void file_open()
  {
    int rc = file_dialog.popup();

    if (rc == Gtk::RESPONSE_OK) {
      const std::string filename = file_dialog.get_filename();

      filepath.set_label(filename);

      original_image.loadImage(filename, loading_flag, scaling_ratio);
      transformed_image.loadImage(filename, loading_flag, scaling_ratio);

      transformed_image.transform(angle, scaling_ratio);
    }
  }
};
}


int main(int argc, char** argv)
{
  Es::Environment env;

  try {
    std::string name = argv[0];

    Es::Application applet(argc, argv);

    Es::Args args;
    args.set(XmNx, 20);
    args.set(XmNy, 40);
    args.set(XmNwidth, 900);
    args.set(XmNheight, 400);
    args.set(XmNscalingRatio, 60); //60%
    Es::MainView mainv(applet, name, args);

    mainv.show();

    applet.run(mainv);

  } catch (Es::Exception& ex) {
    caught(ex);

  } catch (...) {
    printf("Get exception \n");
  }
  return 0;
}