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[wxWidgets.git] / samples / png / pngdemo.cpp

diff --git a/samples/png/pngdemo.cpp b/samples/png/pngdemo.cpp
index 05fb32d7efc866601b46f933bd2bef25cb619f6a..d97f4058ddbc31139610bd5f3c0ab9e241b8df2c 100644 (file)
--- a/samples/png/pngdemo.cpp
+++ b/samples/png/pngdemo.cpp
@@ -26,8 +26,8 @@
 
 #include "pngdemo.h"
 
-MyFrame   *frame = NULL;
-wxBitmap  *g_TestBitmap = NULL;
+MyFrame   *frame = (MyFrame *) NULL;
+wxBitmap  *g_TestBitmap = (wxBitmap *) NULL;
 
 IMPLEMENT_APP(MyApp)
 
@@ -42,7 +42,7 @@ bool MyApp::OnInit(void)
 #endif
 
   // Create the main frame window
-  frame = new MyFrame(NULL, "wxPNGBitmap Demo", wxPoint(0, 0), wxSize(300, 300));
+  frame = new MyFrame((wxFrame *) NULL, "wxPNGBitmap Demo", wxPoint(0, 0), wxSize(300, 300));
 
   // Give it a status line
   frame->CreateStatusBar(2);
@@ -52,6 +52,7 @@ bool MyApp::OnInit(void)
   wxMenu *help_menu = new wxMenu;
 
   file_menu->Append(PNGDEMO_LOAD_FILE, "&Load file",                "Load file");
+  file_menu->Append(PNGDEMO_SAVE_FILE, "&Save file",                "Save file");
   file_menu->Append(PNGDEMO_QUIT, "E&xit",                "Quit program");
   help_menu->Append(PNGDEMO_ABOUT, "&About",              "About PNG demo");
 
@@ -80,30 +81,58 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_MENU(PNGDEMO_QUIT,      MyFrame::OnQuit)
     EVT_MENU(PNGDEMO_ABOUT,     MyFrame::OnAbout)
     EVT_MENU(PNGDEMO_LOAD_FILE, MyFrame::OnLoadFile)
+    EVT_MENU(PNGDEMO_SAVE_FILE, MyFrame::OnSaveFile)
 END_EVENT_TABLE()
 
 // Define my frame constructor
 MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos, const wxSize& size):
   wxFrame(frame, -1, title, pos, size)
 {
-  canvas = NULL;
+  canvas = (MyCanvas *) NULL;
 }
 
-void MyFrame::OnQuit(wxCommandEvent& event)
+void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 {
     Close(TRUE);
 }
 
-void MyFrame::OnAbout(wxCommandEvent& event)
+void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 {
     (void)wxMessageBox("PNG demo\nJulian Smart (c) 1998",
             "About PNG Demo", wxOK);
 }
 
-void MyFrame::OnLoadFile(wxCommandEvent& event)
+void MyFrame::OnSaveFile(wxCommandEvent& WXUNUSED(event))
+{
+  char *f = wxFileSelector( "Save Image", (const char *)NULL, (const char *)NULL, 
+                            "png", "PNG files (*.png)|*.png" );
+
+  if (!f)  return;
+  
+  wxBitmap *backstore = new wxBitmap( 150, 150 );
+  
+  wxMemoryDC memDC;
+  memDC.SelectObject( *backstore );
+  memDC.Clear();
+  memDC.SetBrush( *wxBLACK_BRUSH );
+  memDC.SetPen( *wxWHITE_PEN );
+  memDC.DrawRectangle( 0, 0, 150, 150 );
+  memDC.SetPen( *wxBLACK_PEN );
+  memDC.DrawLine( 0, 0, 0, 10 );
+  memDC.SetTextForeground( *wxWHITE );
+  memDC.DrawText( "This is a memory dc.", 10, 10 );
+  
+  memDC.SelectObject( wxNullBitmap );
+  
+  backstore->SaveFile( f, wxBITMAP_TYPE_PNG, (wxPalette*)NULL );
+  
+  delete backstore;
+}
+
+void MyFrame::OnLoadFile(wxCommandEvent& WXUNUSED(event))
 {
        // Show file selector.
-       char *f = wxFileSelector("Open Image", NULL, NULL,"png",
+       char *f = wxFileSelector("Open Image", (const char *) NULL, (const char *) NULL,"png",
                  "PNG files (*.png)|*.png");
 
        if (!f)
@@ -115,7 +144,7 @@ void MyFrame::OnLoadFile(wxCommandEvent& event)
     if (!g_TestBitmap->Ok())
     {
         delete g_TestBitmap;
-        g_TestBitmap = NULL;
+        g_TestBitmap = (wxBitmap *) NULL;
     }
 
     canvas->Refresh();
@@ -136,7 +165,7 @@ MyCanvas::~MyCanvas(void)
 }
 
 // Define the repainting behaviour
-void MyCanvas::OnPaint(wxPaintEvent& event)
+void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 {
   wxPaintDC dc(this);
   dc.SetPen(wxRED_PEN);