samples/rotate/rotate.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:      rotate.cpp
   3 // Purpose:   Image rotation test
   4 // Author:    Carlos Moreno
   5 // Modified by:
   6 // Created:   6/2/2000
   7 // RCS-ID:    $Id$
   8 // Copyright: (c) 2000
   9 // Licence:   wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16 #pragma hdrstop
  17 #endif
  18
  19 #ifndef WX_PRECOMP
  20 #include "wx/wx.h"
  21 #endif
  22
  23 #include "wx/image.h"
  24 #include "wx/numdlg.h"
  25
  26 class MyApp: public wxApp
  27 {
  28 public:
  29     virtual bool OnInit();
  30
  31     const wxImage& GetImage() const { return m_image; }
  32
  33 private:
  34     wxImage m_image;
  35 };
  36
  37
  38 class MyCanvas: public wxScrolledWindow
  39 {
  40 public:
  41     MyCanvas(wxWindow* parent);
  42
  43     void OnMouseLeftUp (wxMouseEvent & event);
  44     void OnMouseRightUp (wxMouseEvent & event);
  45
  46 private:
  47
  48     DECLARE_EVENT_TABLE()
  49 };
  50
  51 class MyFrame: public wxFrame
  52 {
  53 public:
  54     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  55
  56     void OnQuit (wxCommandEvent &);
  57     void OnAngle(wxCommandEvent &);
  58
  59     double  m_angle;
  60
  61     DECLARE_EVENT_TABLE()
  62 };
  63
  64 enum
  65 {
  66     ID_Quit = 1,
  67     ID_Angle
  68 };
  69
  70 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
  71     EVT_LEFT_UP (MyCanvas::OnMouseLeftUp)
  72     EVT_RIGHT_UP (MyCanvas::OnMouseRightUp)
  73 END_EVENT_TABLE()
  74
  75 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  76     EVT_MENU (ID_Quit, MyFrame::OnQuit)
  77     EVT_MENU (ID_Angle, MyFrame::OnAngle)
  78 END_EVENT_TABLE()
  79
  80 IMPLEMENT_APP(MyApp)
  81
  82 bool MyApp::OnInit()
  83 {
  84     m_image = wxImage(_T("kclub.bmp"), wxBITMAP_TYPE_BMP);
  85
  86     // any unused colour will do
  87     m_image.SetMaskColour( 0, 255, 255 );
  88
  89     if ( !m_image.Ok() )
  90     {
  91         wxLogError(wxT("Can't load the test image, please copy it to the ")
  92                    wxT("program directory"));
  93         return false;
  94     }
  95
  96     MyFrame *frame = new MyFrame (_T("wxWidgets rotate sample"),
  97                                   wxPoint(20,20), wxSize(600,450));
  98
  99     frame->Show (true);
 100     SetTopWindow (frame);
 101     return true;
 102 }
 103
 104 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 105     : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
 106 {
 107     m_angle = 0.1;
 108
 109     new MyCanvas(this);
 110
 111     wxMenu *menuFile = new wxMenu;
 112     menuFile->Append (ID_Angle, _T("Set &angle\tCtrl-A"));
 113     menuFile->AppendSeparator();
 114     menuFile->Append (ID_Quit, _T("E&xit\tAlt-X"));
 115
 116     wxMenuBar *menuBar = new wxMenuBar;
 117     menuBar->Append (menuFile, _T("&File"));
 118
 119     SetMenuBar (menuBar);
 120 }
 121
 122 void MyFrame::OnAngle (wxCommandEvent &)
 123 {
 124     long degrees = (long)((180*m_angle)/M_PI);
 125     degrees = wxGetNumberFromUser(_T("Change the image rotation angle"),
 126                                   _T("Angle in degrees:"),
 127                                   _T("wxWidgets rotate sample"),
 128                                   degrees,
 129                                   -180, +180,
 130                                   this);
 131     if ( degrees != -1 )
 132         m_angle = (degrees * M_PI) / 180.0;
 133 }
 134
 135 void MyFrame::OnQuit (wxCommandEvent &)
 136 {
 137     Close (true);
 138 }
 139
 140 MyCanvas::MyCanvas(wxWindow* parent):
 141   wxScrolledWindow(parent, wxID_ANY)
 142 {
 143     SetBackgroundColour (wxColour (0,80,60));
 144     ClearBackground();
 145 }
 146
 147 // Rotate with interpolation and with offset correction
 148 void MyCanvas::OnMouseLeftUp (wxMouseEvent & event)
 149 {
 150     MyFrame* frame = (MyFrame*) GetParent();
 151
 152     wxPoint offset;
 153     const wxImage& img = wxGetApp().GetImage();
 154     wxImage img2 = img.Rotate(frame->m_angle, wxPoint(img.GetWidth()/2, img.GetHeight()/2), true, &offset);
 155
 156     wxBitmap bmp(img2);
 157
 158     wxClientDC dc (this);
 159     dc.DrawBitmap (bmp, event.m_x + offset.x, event.m_y + offset.y, true);
 160 }
 161
 162 // without interpolation, and without offset correction
 163 void MyCanvas::OnMouseRightUp (wxMouseEvent & event)
 164 {
 165     MyFrame* frame = (MyFrame*) GetParent();
 166
 167     const wxImage& img = wxGetApp().GetImage();
 168     wxImage img2 = img.Rotate(frame->m_angle, wxPoint(img.GetWidth()/2, img.GetHeight()/2), false);
 169
 170     wxBitmap bmp(img2);
 171
 172     wxClientDC dc (this);
 173     dc.DrawBitmap (bmp, event.m_x, event.m_y, true);
 174 }