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