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 /* GRG: This is not ANSI standard, define M_PI explicitly
  27 #include <math.h>       // M_PI
  28 */
  29
  30 #ifndef M_PI
  31 #define M_PI 3.1415926535897932384626433832795
  32 #endif
  33
  34
  35 class MyApp: public wxApp
  36 {
  37 public:
  38     virtual bool OnInit();
  39
  40     const wxImage& GetImage() const { return m_image; }
  41
  42 private:
  43     wxImage m_image;
  44 };
  45
  46
  47 class MyCanvas: public wxScrolledWindow
  48 {
  49 public:
  50     MyCanvas(wxWindow* parent);
  51
  52     void OnMouseLeftUp (wxMouseEvent & event);
  53     void OnMouseRightUp (wxMouseEvent & event);
  54
  55 private:
  56
  57     DECLARE_EVENT_TABLE()
  58 };
  59
  60 class MyFrame: public wxFrame
  61 {
  62 public:
  63     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  64
  65     void OnQuit (wxCommandEvent &);
  66     void OnAngle(wxCommandEvent &);
  67
  68     double  m_angle;
  69
  70     DECLARE_EVENT_TABLE()
  71 };
  72
  73 enum
  74 {
  75     ID_Quit = 1,
  76     ID_Angle
  77 };
  78
  79 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
  80     EVT_LEFT_UP (MyCanvas::OnMouseLeftUp)
  81     EVT_RIGHT_UP (MyCanvas::OnMouseRightUp)
  82 END_EVENT_TABLE()
  83
  84 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
  85     EVT_MENU (ID_Quit, MyFrame::OnQuit)
  86     EVT_MENU (ID_Angle, MyFrame::OnAngle)
  87 END_EVENT_TABLE()
  88
  89 IMPLEMENT_APP(MyApp)
  90
  91 bool MyApp::OnInit()
  92 {
  93     m_image = wxImage(_T("kclub.bmp"), wxBITMAP_TYPE_BMP);
  94
  95     // any unused colour will do
  96     m_image.SetMaskColour( 0, 255, 255 );
  97
  98     if ( !m_image.Ok() )
  99     {
 100         wxLogError(wxT("Can't load the test image, please copy it to the ")
 101                    wxT("program directory"));
 102         return false;
 103     }
 104
 105     MyFrame *frame = new MyFrame (_T("wxWidgets rotate sample"),
 106                                   wxPoint(20,20), wxSize(600,450));
 107
 108     frame->Show (true);
 109     SetTopWindow (frame);
 110     return true;
 111 }
 112
 113 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 114     : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
 115 {
 116     m_angle = 0.1;
 117
 118     new MyCanvas(this);
 119
 120     wxMenu *menuFile = new wxMenu;
 121     menuFile->Append (ID_Angle, _T("Set &angle\tCtrl-A"));
 122     menuFile->AppendSeparator();
 123     menuFile->Append (ID_Quit, _T("E&xit\tAlt-X"));
 124
 125     wxMenuBar *menuBar = new wxMenuBar;
 126     menuBar->Append (menuFile, _T("&File"));
 127
 128     SetMenuBar (menuBar);
 129 }
 130
 131 void MyFrame::OnAngle (wxCommandEvent &)
 132 {
 133     long degrees = (long)((180*m_angle)/M_PI);
 134     degrees = wxGetNumberFromUser(_T("Change the image rotation angle"),
 135                                   _T("Angle in degrees:"),
 136                                   _T("wxWidgets rotate sample"),
 137                                   degrees,
 138                                   -180, +180,
 139                                   this);
 140     if ( degrees != -1 )
 141         m_angle = (degrees * M_PI) / 180.0;
 142 }
 143
 144 void MyFrame::OnQuit (wxCommandEvent &)
 145 {
 146     Close (true);
 147 }
 148
 149 MyCanvas::MyCanvas(wxWindow* parent):
 150   wxScrolledWindow(parent, wxID_ANY)
 151 {
 152     SetBackgroundColour (wxColour (0,80,60));
 153     ClearBackground();
 154 }
 155
 156 // Rotate with interpolation and with offset correction
 157 void MyCanvas::OnMouseLeftUp (wxMouseEvent & event)
 158 {
 159     MyFrame* frame = (MyFrame*) GetParent();
 160
 161     wxPoint offset;
 162     const wxImage& img = wxGetApp().GetImage();
 163     wxImage img2 = img.Rotate(frame->m_angle, wxPoint(img.GetWidth()/2, img.GetHeight()/2), true, &offset);
 164
 165     wxBitmap bmp(img2);
 166
 167     wxClientDC dc (this);
 168     dc.DrawBitmap (bmp, event.m_x + offset.x, event.m_y + offset.y, true);
 169 }
 170
 171 // without interpolation, and without offset correction
 172 void MyCanvas::OnMouseRightUp (wxMouseEvent & event)
 173 {
 174     MyFrame* frame = (MyFrame*) GetParent();
 175
 176     const wxImage& img = wxGetApp().GetImage();
 177     wxImage img2 = img.Rotate(frame->m_angle, wxPoint(img.GetWidth()/2, img.GetHeight()/2), false);
 178
 179     wxBitmap bmp(img2);
 180
 181     wxClientDC dc (this);
 182     dc.DrawBitmap (bmp, event.m_x, event.m_y, true);
 183 }