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