| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: pngdemo.cpp |
| 3 | // Purpose: Demos PNG reading |
| 4 | // Author: Julian Smart |
| 5 | // Modified by: |
| 6 | // Created: 04/01/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Julian Smart |
| 9 | // Licence: wxWindows license |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | #ifdef __GNUG__ |
| 13 | #pragma implementation "pngdemo.h" |
| 14 | #endif |
| 15 | |
| 16 | // For compilers that support precompilation, includes "wx.h". |
| 17 | #include "wx/wxprec.h" |
| 18 | |
| 19 | #ifdef __BORLANDC__ |
| 20 | #pragma hdrstop |
| 21 | #endif |
| 22 | |
| 23 | #include "wx/image.h" |
| 24 | |
| 25 | #include "pngdemo.h" |
| 26 | |
| 27 | MyFrame *frame = (MyFrame *) NULL; |
| 28 | wxBitmap *g_TestBitmap = (wxBitmap *) NULL; |
| 29 | |
| 30 | IMPLEMENT_APP(MyApp) |
| 31 | |
| 32 | bool MyApp::OnInit(void) |
| 33 | { |
| 34 | wxImage::AddHandler(new wxPNGHandler); |
| 35 | |
| 36 | // Create the main frame window |
| 37 | frame = new MyFrame((wxFrame *) NULL, _T("wxPNGBitmap Demo"), wxPoint(0, 0), wxSize(300, 300)); |
| 38 | |
| 39 | #if wxUSE_STATUSBAR |
| 40 | // Give it a status line |
| 41 | frame->CreateStatusBar(2); |
| 42 | #endif // wxUSE_STATUSBAR |
| 43 | |
| 44 | // Make a menubar |
| 45 | wxMenu *file_menu = new wxMenu; |
| 46 | wxMenu *help_menu = new wxMenu; |
| 47 | |
| 48 | file_menu->Append(PNGDEMO_LOAD_FILE, _T("&Load file"), _T("Load file")); |
| 49 | file_menu->Append(PNGDEMO_SAVE_FILE, _T("&Save file"), _T("Save file")); |
| 50 | file_menu->Append(PNGDEMO_QUIT, _T("E&xit"), _T("Quit program")); |
| 51 | help_menu->Append(PNGDEMO_ABOUT, _T("&About"), _T("About PNG demo")); |
| 52 | |
| 53 | wxMenuBar *menu_bar = new wxMenuBar; |
| 54 | |
| 55 | menu_bar->Append(file_menu, _T("&File")); |
| 56 | menu_bar->Append(help_menu, _T("&Help")); |
| 57 | |
| 58 | // Associate the menu bar with the frame |
| 59 | frame->SetMenuBar(menu_bar); |
| 60 | |
| 61 | MyCanvas *canvas = new MyCanvas(frame, wxPoint(0, 0), wxSize(100, 100)); |
| 62 | |
| 63 | // Give it scrollbars: the virtual canvas is 20 * 50 = 1000 pixels in each direction |
| 64 | // canvas->SetScrollbars(20, 20, 50, 50, 4, 4); |
| 65 | frame->canvas = canvas; |
| 66 | |
| 67 | frame->Show(true); |
| 68 | |
| 69 | #if wxUSE_STATUSBAR |
| 70 | frame->SetStatusText(_T("Hello, wxWidgets")); |
| 71 | #endif // wxUSE_STATUSBAR |
| 72 | |
| 73 | return true; |
| 74 | } |
| 75 | |
| 76 | BEGIN_EVENT_TABLE(MyFrame, wxFrame) |
| 77 | EVT_MENU(PNGDEMO_QUIT, MyFrame::OnQuit) |
| 78 | EVT_MENU(PNGDEMO_ABOUT, MyFrame::OnAbout) |
| 79 | EVT_MENU(PNGDEMO_LOAD_FILE, MyFrame::OnLoadFile) |
| 80 | EVT_MENU(PNGDEMO_SAVE_FILE, MyFrame::OnSaveFile) |
| 81 | END_EVENT_TABLE() |
| 82 | |
| 83 | // Define my frame constructor |
| 84 | MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos, const wxSize& size): |
| 85 | wxFrame(frame, wxID_ANY, title, pos, size) |
| 86 | { |
| 87 | canvas = (MyCanvas *) NULL; |
| 88 | } |
| 89 | |
| 90 | // frame destructor |
| 91 | MyFrame::~MyFrame() |
| 92 | { |
| 93 | if (g_TestBitmap) |
| 94 | { |
| 95 | delete g_TestBitmap; |
| 96 | g_TestBitmap = (wxBitmap *) NULL; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) |
| 101 | { |
| 102 | Close(true); |
| 103 | } |
| 104 | |
| 105 | void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) |
| 106 | { |
| 107 | (void)wxMessageBox(_T("PNG demo\nJulian Smart (c) 1998"), |
| 108 | _T("About PNG Demo"), wxOK); |
| 109 | } |
| 110 | |
| 111 | void MyFrame::OnSaveFile(wxCommandEvent& WXUNUSED(event)) |
| 112 | { |
| 113 | wxString f = wxFileSelector( wxT("Save Image"), (const wxChar *)NULL, |
| 114 | (const wxChar *)NULL, |
| 115 | wxT("png"), wxT("PNG files (*.png)|*.png") ); |
| 116 | |
| 117 | if (f == _T("")) return; |
| 118 | |
| 119 | wxBitmap *backstore = new wxBitmap( 150, 150 ); |
| 120 | |
| 121 | wxMemoryDC memDC; |
| 122 | memDC.SelectObject( *backstore ); |
| 123 | memDC.Clear(); |
| 124 | memDC.SetBrush( *wxBLACK_BRUSH ); |
| 125 | memDC.SetPen( *wxWHITE_PEN ); |
| 126 | memDC.DrawRectangle( 0, 0, 150, 150 ); |
| 127 | memDC.SetPen( *wxBLACK_PEN ); |
| 128 | memDC.DrawLine( 0, 0, 0, 10 ); |
| 129 | memDC.SetTextForeground( *wxWHITE ); |
| 130 | memDC.DrawText( _T("This is a memory dc."), 10, 10 ); |
| 131 | |
| 132 | memDC.SelectObject( wxNullBitmap ); |
| 133 | |
| 134 | backstore->SaveFile( f, wxBITMAP_TYPE_PNG, (wxPalette*)NULL ); |
| 135 | |
| 136 | delete backstore; |
| 137 | } |
| 138 | |
| 139 | void MyFrame::OnLoadFile(wxCommandEvent& WXUNUSED(event)) |
| 140 | { |
| 141 | // Show file selector. |
| 142 | wxString f = wxFileSelector(wxT("Open Image"), (const wxChar *) NULL, |
| 143 | (const wxChar *) NULL, wxT("png"), |
| 144 | wxT("PNG files (*.png)|*.png")); |
| 145 | |
| 146 | if (f == _T("")) |
| 147 | return; |
| 148 | |
| 149 | if ( g_TestBitmap ) |
| 150 | delete g_TestBitmap; |
| 151 | |
| 152 | g_TestBitmap = new wxBitmap(f, wxBITMAP_TYPE_PNG); |
| 153 | if (!g_TestBitmap->Ok()) |
| 154 | { |
| 155 | delete g_TestBitmap; |
| 156 | g_TestBitmap = (wxBitmap *) NULL; |
| 157 | } |
| 158 | |
| 159 | canvas->Refresh(); |
| 160 | } |
| 161 | |
| 162 | BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow) |
| 163 | EVT_PAINT(MyCanvas::OnPaint) |
| 164 | END_EVENT_TABLE() |
| 165 | |
| 166 | // Define a constructor for my canvas |
| 167 | MyCanvas::MyCanvas(wxWindow *parent, const wxPoint& pos, const wxSize& size): |
| 168 | wxScrolledWindow(parent, wxID_ANY, pos, size) |
| 169 | { |
| 170 | } |
| 171 | |
| 172 | // Define the repainting behaviour |
| 173 | void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) |
| 174 | { |
| 175 | wxPaintDC dc(this); |
| 176 | dc.SetPen(* wxRED_PEN); |
| 177 | |
| 178 | int i; |
| 179 | for ( i = 0; i < 500; i += 10) |
| 180 | { |
| 181 | dc.DrawLine(0, i, 800, i); |
| 182 | } |
| 183 | if ( g_TestBitmap && g_TestBitmap->Ok() ) |
| 184 | { |
| 185 | wxMemoryDC memDC; |
| 186 | if ( g_TestBitmap->GetPalette() ) |
| 187 | { |
| 188 | memDC.SetPalette(* g_TestBitmap->GetPalette()); |
| 189 | dc.SetPalette(* g_TestBitmap->GetPalette()); |
| 190 | } |
| 191 | memDC.SelectObject(* g_TestBitmap); |
| 192 | |
| 193 | // Normal, non-transparent blitting |
| 194 | dc.Blit(20, 20, g_TestBitmap->GetWidth(), g_TestBitmap->GetHeight(), & memDC, 0, 0, wxCOPY, false); |
| 195 | |
| 196 | memDC.SelectObject(wxNullBitmap); |
| 197 | } |
| 198 | |
| 199 | if ( g_TestBitmap && g_TestBitmap->Ok() ) |
| 200 | { |
| 201 | wxMemoryDC memDC; |
| 202 | memDC.SelectObject(* g_TestBitmap); |
| 203 | |
| 204 | // Transparent blitting if there's a mask in the bitmap |
| 205 | dc.Blit(20 + g_TestBitmap->GetWidth() + 20, 20, g_TestBitmap->GetWidth(), g_TestBitmap->GetHeight(), & memDC, |
| 206 | 0, 0, wxCOPY, true); |
| 207 | |
| 208 | memDC.SelectObject(wxNullBitmap); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | |