gistfile1.hpp

// CFLAGS=`wx-config --cflags`
// LDFLAGS=`wx-config --libs gl`
#ifndef _FRAME_H
#define _FRAME_H

#include <wx/wx.h>
#include <wx/glcanvas.h>
#ifdef _MSC_VER
#pragma comment(lib, "opengl32.lib")
#endif

class OpenGL
{
  public:
    void initialize()
    {
      glClearColor(0, 0, 1, 1);
    }

    void setViewport(int w, int h)
    {
      glViewport(0, 0, (GLint)w, (GLint)h);

      glMatrixMode(GL_PROJECTION);
      glLoadIdentity();
      //glFrustum(-0.5f, 0.5f, -0.5f, 0.5f, 0.1f, 100.0f);
      glOrtho(-w / 200.0, w / 200.0, -h / 200.0, h / 200.0, -1.0, 1.0);
    }

    void draw()
    {
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

      glMatrixMode(GL_MODELVIEW);
      // view
      glLoadIdentity();

      glBegin(GL_POLYGON);
      glColor3d(1.0, 0.0, 0.0);
      glVertex2d(-0.9, -0.9);
      glColor3d(0.0, 1.0, 0.0);
      glVertex2d(0.9, -0.9);
      glColor3d(0.0, 0.0, 1.0);
      glVertex2d(0.9, 0.9);
      glColor3d(1.0, 1.0, 0.0);
      glVertex2d(-0.9, 0.9);
      glEnd();
    }
};


class MyPanel : public wxGLCanvas
{
  bool isInitialized_;
  OpenGL gl_;

  public:
  MyPanel(wxWindow* parent, wxGLContext* sharedContext, wxWindowID id)
    : wxGLCanvas(parent, sharedContext, id), isInitialized_(false)
  {
    Connect(wxEVT_SIZE
        , wxSizeEventHandler(MyPanel::OnSize));
    Connect(wxEVT_PAINT
        , wxPaintEventHandler(MyPanel::OnPaint));
    Connect(wxEVT_ERASE_BACKGROUND
        , wxEraseEventHandler(MyPanel::OnEraseBackground));
  }

  void OnPaint(wxPaintEvent &event)
  {
    wxPaintDC dc(this);

    if(!GetContext()){
      return;
    }

    if(!isInitialized_){
      SetCurrent();
      gl_.initialize();
      int w;
      int h;
      GetClientSize(&w, &h);
      gl_.setViewport(w, h);
      isInitialized_=true;
    }

    gl_.draw();

    glFlush();
    SwapBuffers();
  }

  void OnSize(wxSizeEvent &event)
  {
    wxGLCanvas::OnSize(event);

    if(GetContext())
    {
      SetCurrent();
      gl_.setViewport(event.GetSize().GetWidth(), event.GetSize().GetHeight());
      Refresh();
    }
  }

  void OnEraseBackground(wxEraseEvent& event)
  {
    // Do nothing, to avoid flashing.
  }
};


class TopFrame : public wxFrame
{
  MyPanel *panel_;
  wxMenuBar *menubar_;
  wxMenu *file_;

  public:
  TopFrame(const wxString& title)
    : wxFrame(NULL, wxID_ANY, title)
  {
    menubar_ = new wxMenuBar;
    file_ = new wxMenu;
    file_->Append(wxID_OPEN, wxT("&Open"));
    file_->Append(wxID_EXIT, wxT("&Quit"));
    menubar_->Append(file_, wxT("&File"));
    SetMenuBar(menubar_);

    panel_=new MyPanel(this, NULL, wxID_ANY);

    Connect(wxID_OPEN, wxEVT_COMMAND_MENU_SELECTED,
        wxCommandEventHandler(TopFrame::OnOpen));
    Connect(wxID_EXIT, wxEVT_COMMAND_MENU_SELECTED,
        wxCommandEventHandler(TopFrame::OnQuit));
  }

  void OnOpen(wxCommandEvent& WXUNUSED(event))
  {
    wxString filename = wxFileSelector(
        wxT("Choose a file to open")
        , wxT("")
        , wxT("")
        , wxT("mqo")
        , wxT("MQO files (*.mqo)|*.mqo")
        );
    if (filename.empty())
    {
      return;
    }

    // open
  }

  void OnQuit(wxCommandEvent& WXUNUSED(event))
  {
    Close(true);
  }
};

#endif // _FRAME_H