samples/printing/printing.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        samples/printing.cpp
   3 // Purpose:     Printing demo for wxWidgets
   4 // Author:      Julian Smart
   5 // Modified by: Francesco Montorsi
   6 // Created:     1995
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx/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     #include "wx/log.h"
  22 #endif
  23
  24 #if !wxUSE_PRINTING_ARCHITECTURE
  25     #error "You must set wxUSE_PRINTING_ARCHITECTURE to 1 in setup.h, and recompile the library."
  26 #endif
  27
  28 // Set this to 1 if you want to test PostScript printing under MSW.
  29 // However, you'll also need to edit src/msw/makefile.nt.
  30 #define wxTEST_POSTSCRIPT_IN_MSW 0
  31
  32 #include <ctype.h>
  33 #include "wx/metafile.h"
  34 #include "wx/print.h"
  35 #include "wx/printdlg.h"
  36 #include "wx/image.h"
  37 #include "wx/accel.h"
  38
  39 #if wxTEST_POSTSCRIPT_IN_MSW
  40     #include "wx/generic/printps.h"
  41     #include "wx/generic/prntdlgg.h"
  42 #endif
  43
  44 #if wxUSE_GRAPHICS_CONTEXT
  45     #include "wx/graphics.h"
  46 #endif
  47
  48 #ifdef __WXMAC__
  49     #include "wx/osx/printdlg.h"
  50 #endif
  51
  52 #include "printing.h"
  53
  54 #ifndef __WXMSW__
  55     #include "mondrian.xpm"
  56 #endif
  57
  58 // Global print data, to remember settings during the session
  59 wxPrintData *g_printData = NULL;
  60
  61 // Global page setup data
  62 wxPageSetupDialogData* g_pageSetupData = NULL;
  63
  64
  65
  66 // ----------------------------------------------------------------------------
  67 // MyApp
  68 // ----------------------------------------------------------------------------
  69
  70 IMPLEMENT_APP(MyApp)
  71
  72 bool MyApp::OnInit(void)
  73 {
  74     if ( !wxApp::OnInit() )
  75         return false;
  76
  77     wxInitAllImageHandlers();
  78
  79
  80     // init global objects
  81     // -------------------
  82
  83     g_printData = new wxPrintData;
  84
  85     // You could set an initial paper size here
  86 #if 0
  87     g_printData->SetPaperId(wxPAPER_LETTER); // for Americans
  88     g_printData->SetPaperId(wxPAPER_A4);    // for everyone else
  89 #endif
  90
  91     g_pageSetupData = new wxPageSetupDialogData;
  92
  93     // copy over initial paper size from print record
  94     (*g_pageSetupData) = *g_printData;
  95
  96     // Set some initial page margins in mm.
  97     g_pageSetupData->SetMarginTopLeft(wxPoint(15, 15));
  98     g_pageSetupData->SetMarginBottomRight(wxPoint(15, 15));
  99
 100
 101     // init local GUI objects
 102     // ----------------------
 103
 104 #if 0
 105     wxImage image( wxT("test.jpg") );
 106     image.SetAlpha();
 107     int i,j;
 108     for (i = 0; i < image.GetWidth(); i++)
 109        for (j = 0; j < image.GetHeight(); j++)
 110           image.SetAlpha( i, j, 50 );
 111     m_bitmap = image;
 112 #endif
 113     m_angle = 30;
 114     m_testFont.Create(10, wxFONTFAMILY_SWISS, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
 115
 116
 117     // Create the main frame window
 118     // ----------------------------
 119
 120     MyFrame* frame = new MyFrame((wxFrame *) NULL, wxT("wxWidgets Printing Demo"),
 121                                  wxPoint(0, 0), wxSize(400, 400));
 122
 123     frame->Centre(wxBOTH);
 124     frame->Show();
 125
 126     SetTopWindow(frame);
 127
 128     return true;
 129 }
 130
 131 int MyApp::OnExit()
 132 {
 133     delete g_printData;
 134     delete g_pageSetupData;
 135
 136     return wxApp::OnExit();
 137 }
 138
 139 void MyApp::Draw(wxDC&dc)
 140 {
 141     // This routine just draws a bunch of random stuff on the screen so that we
 142     // can check that different types of object are being drawn consistently
 143     // between the screen image, the print preview image (at various zoom
 144     // levels), and the printed page.
 145     dc.SetBackground(*wxWHITE_BRUSH);
 146     // dc.Clear();
 147     dc.SetFont(m_testFont);
 148
 149     // dc.SetBackgroundMode(wxTRANSPARENT);
 150
 151     dc.SetPen(*wxBLACK_PEN);
 152     dc.SetBrush(*wxLIGHT_GREY_BRUSH);
 153
 154     dc.DrawRectangle(0, 0, 230, 350);
 155     dc.DrawLine(0, 0, 229, 349);
 156     dc.DrawLine(229, 0, 0, 349);
 157     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 158
 159     dc.SetBrush(*wxCYAN_BRUSH);
 160     dc.SetPen(*wxRED_PEN);
 161
 162     dc.DrawRoundedRectangle(0, 20, 200, 80, 20);
 163
 164     dc.DrawText( wxT("Rectangle 200 by 80"), 40, 40);
 165
 166     dc.SetPen( wxPen(*wxBLACK,0,wxDOT_DASH) );
 167     dc.DrawEllipse(50, 140, 100, 50);
 168     dc.SetPen(*wxRED_PEN);
 169
 170     dc.DrawText( wxT("Test message: this is in 10 point text"), 10, 180);
 171
 172 #if wxUSE_UNICODE
 173     const char *test = "Hebrew    שלום -- Japanese (日本語)";
 174     wxString tmp = wxConvUTF8.cMB2WC( test );
 175     dc.DrawText( tmp, 10, 200 );
 176 #endif
 177
 178     wxPoint points[5];
 179     points[0].x = 0;
 180     points[0].y = 0;
 181     points[1].x = 20;
 182     points[1].y = 0;
 183     points[2].x = 20;
 184     points[2].y = 20;
 185     points[3].x = 10;
 186     points[3].y = 20;
 187     points[4].x = 10;
 188     points[4].y = -20;
 189     dc.DrawPolygon( 5, points, 20, 250, wxODDEVEN_RULE );
 190     dc.DrawPolygon( 5, points, 50, 250, wxWINDING_RULE );
 191
 192     dc.DrawEllipticArc( 80, 250, 60, 30, 0.0, 270.0 );
 193
 194     points[0].x = 150;
 195     points[0].y = 250;
 196     points[1].x = 180;
 197     points[1].y = 250;
 198     points[2].x = 180;
 199     points[2].y = 220;
 200     points[3].x = 200;
 201     points[3].y = 220;
 202     dc.DrawSpline( 4, points );
 203
 204     dc.DrawArc( 20,10, 10,10, 25,40 );
 205
 206     wxString str;
 207     int i = 0;
 208     str.Printf( wxT("---- Text at angle %d ----"), i );
 209     dc.DrawRotatedText( str, 100, 300, i );
 210
 211     i = m_angle;
 212     str.Printf( wxT("---- Text at angle %d ----"), i );
 213     dc.DrawRotatedText( str, 100, 300, i );
 214
 215     wxIcon my_icon = wxICON(mondrian);
 216
 217     dc.DrawIcon( my_icon, 100, 100);
 218
 219     if (m_bitmap.IsOk())
 220         dc.DrawBitmap( m_bitmap, 10, 10 );
 221
 222 #if wxUSE_GRAPHICS_CONTEXT
 223     wxGraphicsContext *gc = NULL;
 224
 225     wxPrinterDC *printer_dc = wxDynamicCast( &dc, wxPrinterDC );
 226     if (printer_dc)
 227         gc = wxGraphicsContext::Create( *printer_dc );
 228
 229     wxWindowDC *window_dc = wxDynamicCast( &dc, wxWindowDC );
 230     if (window_dc)
 231         gc = wxGraphicsContext::Create( *window_dc );
 232
 233     if (gc)
 234     {
 235         // make a path that contains a circle and some lines, centered at 100,100
 236         gc->SetPen( *wxRED_PEN );
 237         gc->SetFont( m_testFont, *wxGREEN );
 238         wxGraphicsPath path = gc->CreatePath();
 239         path.AddCircle( 50.0, 50.0, 50.0 );
 240         path.MoveToPoint(0.0, 50.0);
 241         path.AddLineToPoint(100.0, 50.0);
 242         path.MoveToPoint(50.0, 0.0);
 243         path.AddLineToPoint(50.0, 100.0 );
 244         path.CloseSubpath();
 245         path.AddRectangle(25.0, 25.0, 50.0, 50.0);
 246
 247         gc->StrokePath(path);
 248
 249         delete gc;
 250     }
 251 #endif
 252 }
 253
 254
 255 // ----------------------------------------------------------------------------
 256 // MyFrame
 257 // ----------------------------------------------------------------------------
 258
 259 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 260     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 261     EVT_MENU(wxID_PRINT, MyFrame::OnPrint)
 262     EVT_MENU(wxID_PREVIEW, MyFrame::OnPrintPreview)
 263     EVT_MENU(WXPRINT_PAGE_SETUP, MyFrame::OnPageSetup)
 264     EVT_MENU(wxID_ABOUT, MyFrame::OnPrintAbout)
 265 #if defined(__WXMSW__) &&wxTEST_POSTSCRIPT_IN_MSW
 266     EVT_MENU(WXPRINT_PRINT_PS, MyFrame::OnPrintPS)
 267     EVT_MENU(WXPRINT_PREVIEW_PS, MyFrame::OnPrintPreviewPS)
 268     EVT_MENU(WXPRINT_PAGE_SETUP_PS, MyFrame::OnPageSetupPS)
 269 #endif
 270 #ifdef __WXMAC__
 271     EVT_MENU(WXPRINT_PAGE_MARGINS, MyFrame::OnPageMargins)
 272 #endif
 273     EVT_MENU(WXPRINT_ANGLEUP, MyFrame::OnAngleUp)
 274     EVT_MENU(WXPRINT_ANGLEDOWN, MyFrame::OnAngleDown)
 275 END_EVENT_TABLE()
 276
 277 MyFrame::MyFrame(wxFrame *frame, const wxString&title, const wxPoint&pos, const wxSize&size)
 278         : wxFrame(frame, wxID_ANY, title, pos, size)
 279 {
 280     m_canvas = NULL;
 281
 282 #if wxUSE_STATUSBAR
 283     // Give us a status line
 284     CreateStatusBar(2);
 285     SetStatusText(wxT("Printing demo"));
 286 #endif // wxUSE_STATUSBAR
 287
 288     // Load icon and bitmap
 289     SetIcon( wxICON( mondrian) );
 290
 291     // Make a menubar
 292     wxMenu *file_menu = new wxMenu;
 293
 294     file_menu->Append(wxID_PRINT, wxT("&Print..."),                 wxT("Print"));
 295     file_menu->Append(WXPRINT_PAGE_SETUP, wxT("Page Set&up..."),    wxT("Page setup"));
 296 #ifdef __WXMAC__
 297     file_menu->Append(WXPRINT_PAGE_MARGINS, wxT("Page Margins..."), wxT("Page margins"));
 298 #endif
 299     file_menu->Append(wxID_PREVIEW, wxT("Print Pre&view"),          wxT("Preview"));
 300
 301 #if wxUSE_ACCEL
 302     // Accelerators
 303     wxAcceleratorEntry entries[1];
 304     entries[0].Set(wxACCEL_CTRL, (int) 'V', wxID_PREVIEW);
 305     wxAcceleratorTable accel(1, entries);
 306     SetAcceleratorTable(accel);
 307 #endif
 308
 309 #if defined(__WXMSW__) &&wxTEST_POSTSCRIPT_IN_MSW
 310     file_menu->AppendSeparator();
 311     file_menu->Append(WXPRINT_PRINT_PS, wxT("Print PostScript..."),           wxT("Print (PostScript)"));
 312     file_menu->Append(WXPRINT_PAGE_SETUP_PS, wxT("Page Setup PostScript..."), wxT("Page setup (PostScript)"));
 313     file_menu->Append(WXPRINT_PREVIEW_PS, wxT("Print Preview PostScript"),    wxT("Preview (PostScript)"));
 314 #endif
 315
 316     file_menu->AppendSeparator();
 317     file_menu->Append(WXPRINT_ANGLEUP, wxT("Angle up\tAlt-U"),                wxT("Raise rotated text angle"));
 318     file_menu->Append(WXPRINT_ANGLEDOWN, wxT("Angle down\tAlt-D"),            wxT("Lower rotated text angle"));
 319     file_menu->AppendSeparator();
 320     file_menu->Append(wxID_EXIT, wxT("E&xit"),                                wxT("Exit program"));
 321
 322     wxMenu *help_menu = new wxMenu;
 323     help_menu->Append(wxID_ABOUT, wxT("&About"),                              wxT("About this demo"));
 324
 325     wxMenuBar *menu_bar = new wxMenuBar;
 326
 327     menu_bar->Append(file_menu, wxT("&File"));
 328     menu_bar->Append(help_menu, wxT("&Help"));
 329
 330     // Associate the menu bar with the frame
 331     SetMenuBar(menu_bar);
 332
 333
 334     // create the canvas
 335     // -----------------
 336
 337     m_canvas = new MyCanvas(this, wxPoint(0, 0), wxSize(100, 100),
 338                             wxRETAINED|wxHSCROLL|wxVSCROLL);
 339
 340     // Give it scrollbars: the virtual canvas is 20 * 50 = 1000 pixels in each direction
 341     m_canvas->SetScrollbars(20, 20, 50, 50);
 342 }
 343
 344 void MyFrame::OnExit(wxCommandEvent& WXUNUSED(event))
 345 {
 346     Close(true /*force closing*/);
 347 }
 348
 349 void MyFrame::OnPrint(wxCommandEvent& WXUNUSED(event))
 350 {
 351     wxPrintDialogData printDialogData(* g_printData);
 352
 353     wxPrinter printer(&printDialogData);
 354     MyPrintout printout(this, wxT("My printout"));
 355     if (!printer.Print(this, &printout, true /*prompt*/))
 356     {
 357         if (wxPrinter::GetLastError() == wxPRINTER_ERROR)
 358         {
 359             wxLogError(wxT("There was a problem printing. Perhaps your current printer is not set correctly?"));
 360         }
 361         else
 362         {
 363             wxLogMessage(wxT("You canceled printing"));
 364         }
 365     }
 366     else
 367     {
 368         (*g_printData) = printer.GetPrintDialogData().GetPrintData();
 369     }
 370 }
 371
 372 void MyFrame::OnPrintPreview(wxCommandEvent& WXUNUSED(event))
 373 {
 374     // Pass two printout objects: for preview, and possible printing.
 375     wxPrintDialogData printDialogData(* g_printData);
 376     wxPrintPreview *preview =
 377         new wxPrintPreview(new MyPrintout(this), new MyPrintout(this), &printDialogData);
 378     if (!preview->IsOk())
 379     {
 380         delete preview;
 381         wxLogError(wxT("There was a problem previewing.\nPerhaps your current printer is not set correctly?"));
 382         return;
 383     }
 384
 385     wxPreviewFrame *frame =
 386         new wxPreviewFrame(preview, this, wxT("Demo Print Preview"), wxPoint(100, 100), wxSize(600, 650));
 387     frame->Centre(wxBOTH);
 388     frame->Initialize();
 389     frame->Show();
 390 }
 391
 392 void MyFrame::OnPageSetup(wxCommandEvent& WXUNUSED(event))
 393 {
 394     (*g_pageSetupData) = *g_printData;
 395
 396     wxPageSetupDialog pageSetupDialog(this, g_pageSetupData);
 397     pageSetupDialog.ShowModal();
 398
 399     (*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
 400     (*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
 401 }
 402
 403 #if defined(__WXMSW__) && wxTEST_POSTSCRIPT_IN_MSW
 404 void MyFrame::OnPrintPS(wxCommandEvent& WXUNUSED(event))
 405 {
 406     wxPostScriptPrinter printer(g_printData);
 407     MyPrintout printout(wxT("My printout"));
 408     printer.Print(this, &printout, true/*prompt*/);
 409
 410     (*g_printData) = printer.GetPrintData();
 411 }
 412
 413 void MyFrame::OnPrintPreviewPS(wxCommandEvent& WXUNUSED(event))
 414 {
 415     // Pass two printout objects: for preview, and possible printing.
 416     wxPrintDialogData printDialogData(* g_printData);
 417     wxPrintPreview *preview = new wxPrintPreview(new MyPrintout, new MyPrintout, &printDialogData);
 418     wxPreviewFrame *frame =
 419         new wxPreviewFrame(preview, this, wxT("Demo Print Preview"), wxPoint(100, 100), wxSize(600, 650));
 420     frame->Centre(wxBOTH);
 421     frame->Initialize();
 422     frame->Show();
 423 }
 424
 425 void MyFrame::OnPageSetupPS(wxCommandEvent& WXUNUSED(event))
 426 {
 427     (*g_pageSetupData) = * g_printData;
 428
 429     wxGenericPageSetupDialog pageSetupDialog(this, g_pageSetupData);
 430     pageSetupDialog.ShowModal();
 431
 432     (*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
 433     (*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
 434 }
 435 #endif
 436
 437 #ifdef __WXMAC__
 438 void MyFrame::OnPageMargins(wxCommandEvent& WXUNUSED(event))
 439 {
 440     (*g_pageSetupData) = *g_printData;
 441
 442     wxMacPageMarginsDialog pageMarginsDialog(this, g_pageSetupData);
 443     pageMarginsDialog.ShowModal();
 444
 445     (*g_printData) = pageMarginsDialog.GetPageSetupDialogData().GetPrintData();
 446     (*g_pageSetupData) = pageMarginsDialog.GetPageSetupDialogData();
 447 }
 448 #endif
 449
 450 void MyFrame::OnPrintAbout(wxCommandEvent& WXUNUSED(event))
 451 {
 452     (void)wxMessageBox(wxT("wxWidgets printing demo\nAuthor: Julian Smart"),
 453                        wxT("About wxWidgets printing demo"), wxOK|wxCENTRE);
 454 }
 455
 456 void MyFrame::OnAngleUp(wxCommandEvent& WXUNUSED(event))
 457 {
 458     wxGetApp().IncrementAngle();
 459     m_canvas->Refresh();
 460 }
 461
 462 void MyFrame::OnAngleDown(wxCommandEvent& WXUNUSED(event))
 463 {
 464     wxGetApp().DecrementAngle();
 465     m_canvas->Refresh();
 466 }
 467
 468
 469 // ----------------------------------------------------------------------------
 470 // MyCanvas
 471 // ----------------------------------------------------------------------------
 472
 473 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 474   //  EVT_PAINT(MyCanvas::OnPaint)
 475 END_EVENT_TABLE()
 476
 477 MyCanvas::MyCanvas(wxFrame *frame, const wxPoint&pos, const wxSize&size, long style)
 478     : wxScrolledWindow(frame, wxID_ANY, pos, size, style)
 479 {
 480     SetBackgroundColour(*wxWHITE);
 481 }
 482
 483 //void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(evt))
 484 void MyCanvas::OnDraw(wxDC& dc)
 485 {
 486     //wxPaintDC dc(this);
 487     wxGetApp().Draw(dc);
 488 }
 489
 490
 491 // ----------------------------------------------------------------------------
 492 // MyPrintout
 493 // ----------------------------------------------------------------------------
 494
 495 bool MyPrintout::OnPrintPage(int page)
 496 {
 497     wxDC *dc = GetDC();
 498     if (dc)
 499     {
 500         if (page == 1)
 501             DrawPageOne();
 502         else if (page == 2)
 503             DrawPageTwo();
 504
 505         // Draw page numbers at top left corner of printable area, sized so that
 506         // screen size of text matches paper size.
 507         MapScreenSizeToPage();
 508
 509         dc->DrawText(wxString::Format(wxT("PAGE %d"), page), 0, 0);
 510
 511         return true;
 512     }
 513     else
 514         return false;
 515 }
 516
 517 bool MyPrintout::OnBeginDocument(int startPage, int endPage)
 518 {
 519     if (!wxPrintout::OnBeginDocument(startPage, endPage))
 520         return false;
 521
 522     return true;
 523 }
 524
 525 void MyPrintout::GetPageInfo(int *minPage, int *maxPage, int *selPageFrom, int *selPageTo)
 526 {
 527     *minPage = 1;
 528     *maxPage = 2;
 529     *selPageFrom = 1;
 530     *selPageTo = 2;
 531 }
 532
 533 bool MyPrintout::HasPage(int pageNum)
 534 {
 535     return (pageNum == 1 || pageNum == 2);
 536 }
 537
 538 void MyPrintout::DrawPageOne()
 539 {
 540     // You might use THIS code if you were scaling graphics of known size to fit
 541     // on the page. The commented-out code illustrates different ways of scaling
 542     // the graphics.
 543
 544     // We know the graphic is 230x350. If we didn't know this, we'd need to
 545     // calculate it.
 546     wxCoord maxX = 230;
 547     wxCoord maxY = 350;
 548
 549     // This sets the user scale and origin of the DC so that the image fits
 550     // within the paper rectangle (but the edges could be cut off by printers
 551     // that can't print to the edges of the paper -- which is most of them. Use
 552     // this if your image already has its own margins.
 553 //    FitThisSizeToPaper(wxSize(maxX, maxY));
 554 //    wxRect fitRect = GetLogicalPaperRect();
 555
 556     // This sets the user scale and origin of the DC so that the image fits
 557     // within the page rectangle, which is the printable area on Mac and MSW
 558     // and is the entire page on other platforms.
 559 //    FitThisSizeToPage(wxSize(maxX, maxY));
 560 //    wxRect fitRect = GetLogicalPageRect();
 561
 562     // This sets the user scale and origin of the DC so that the image fits
 563     // within the page margins as specified by g_PageSetupData, which you can
 564     // change (on some platforms, at least) in the Page Setup dialog. Note that
 565     // on Mac, the native Page Setup dialog doesn't let you change the margins
 566     // of a wxPageSetupDialogData object, so you'll have to write your own dialog or
 567     // use the Mac-only wxMacPageMarginsDialog, as we do in this program.
 568     FitThisSizeToPageMargins(wxSize(maxX, maxY), *g_pageSetupData);
 569     wxRect fitRect = GetLogicalPageMarginsRect(*g_pageSetupData);
 570
 571     // This sets the user scale and origin of the DC so that the image appears
 572     // on the paper at the same size that it appears on screen (i.e., 10-point
 573     // type on screen is 10-point on the printed page) and is positioned in the
 574     // top left corner of the page rectangle (just as the screen image appears
 575     // in the top left corner of the window).
 576 //    MapScreenSizeToPage();
 577 //    wxRect fitRect = GetLogicalPageRect();
 578
 579     // You could also map the screen image to the entire paper at the same size
 580     // as it appears on screen.
 581 //    MapScreenSizeToPaper();
 582 //    wxRect fitRect = GetLogicalPaperRect();
 583
 584     // You might also wish to do you own scaling in order to draw objects at
 585     // full native device resolution. In this case, you should do the following.
 586     // Note that you can use the GetLogicalXXXRect() commands to obtain the
 587     // appropriate rect to scale to.
 588 //    MapScreenSizeToDevice();
 589 //    wxRect fitRect = GetLogicalPageRect();
 590
 591     // Each of the preceding Fit or Map routines positions the origin so that
 592     // the drawn image is positioned at the top left corner of the reference
 593     // rectangle. You can easily center or right- or bottom-justify the image as
 594     // follows.
 595
 596     // This offsets the image so that it is centered within the reference
 597     // rectangle defined above.
 598     wxCoord xoff = (fitRect.width - maxX) / 2;
 599     wxCoord yoff = (fitRect.height - maxY) / 2;
 600     OffsetLogicalOrigin(xoff, yoff);
 601
 602     // This offsets the image so that it is positioned at the bottom right of
 603     // the reference rectangle defined above.
 604 //    wxCoord xoff = (fitRect.width - maxX);
 605 //    wxCoord yoff = (fitRect.height - maxY);
 606 //    OffsetLogicalOrigin(xoff, yoff);
 607
 608     wxGetApp().Draw(*GetDC());
 609 }
 610
 611 void MyPrintout::DrawPageTwo()
 612 {
 613     // You might use THIS code to set the printer DC to ROUGHLY reflect
 614     // the screen text size. This page also draws lines of actual length
 615     // 5cm on the page.
 616
 617     // Compare this to DrawPageOne(), which uses the really convenient routines
 618     // from wxPrintout to fit the screen image onto the printed page. This page
 619     // illustrates how to do all the scaling calculations yourself, if you're so
 620     // inclined.
 621
 622     wxDC *dc = GetDC();
 623
 624     // Get the logical pixels per inch of screen and printer
 625     int ppiScreenX, ppiScreenY;
 626     GetPPIScreen(&ppiScreenX, &ppiScreenY);
 627     int ppiPrinterX, ppiPrinterY;
 628     GetPPIPrinter(&ppiPrinterX, &ppiPrinterY);
 629
 630     // This scales the DC so that the printout roughly represents the the screen
 631     // scaling. The text point size _should_ be the right size but in fact is
 632     // too small for some reason. This is a detail that will need to be
 633     // addressed at some point but can be fudged for the moment.
 634     float scale = (float)((float)ppiPrinterX/(float)ppiScreenX);
 635
 636     // Now we have to check in case our real page size is reduced (e.g. because
 637     // we're drawing to a print preview memory DC)
 638     int pageWidth, pageHeight;
 639     int w, h;
 640     dc->GetSize(&w, &h);
 641     GetPageSizePixels(&pageWidth, &pageHeight);
 642
 643     // If printer pageWidth == current DC width, then this doesn't change. But w
 644     // might be the preview bitmap width, so scale down.
 645     float overallScale = scale * (float)(w/(float)pageWidth);
 646     dc->SetUserScale(overallScale, overallScale);
 647
 648     // Calculate conversion factor for converting millimetres into logical
 649     // units. There are approx. 25.4 mm to the inch. There are ppi device units
 650     // to the inch. Therefore 1 mm corresponds to ppi/25.4 device units. We also
 651     // divide by the screen-to-printer scaling factor, because we need to
 652     // unscale to pass logical units to DrawLine.
 653
 654     // Draw 50 mm by 50 mm L shape
 655     float logUnitsFactor = (float)(ppiPrinterX/(scale*25.4));
 656     float logUnits = (float)(50*logUnitsFactor);
 657     dc->SetPen(* wxBLACK_PEN);
 658     dc->DrawLine(50, 250, (long)(50.0 + logUnits), 250);
 659     dc->DrawLine(50, 250, 50, (long)(250.0 + logUnits));
 660
 661     dc->SetBackgroundMode(wxTRANSPARENT);
 662     dc->SetBrush(*wxTRANSPARENT_BRUSH);
 663
 664     { // GetTextExtent demo:
 665         wxString words[7] = { wxT("This "), wxT("is "), wxT("GetTextExtent "),
 666                              wxT("testing "), wxT("string. "), wxT("Enjoy "), wxT("it!") };
 667         wxCoord w, h;
 668         long x = 200, y= 250;
 669         wxFont fnt(15, wxSWISS, wxNORMAL, wxNORMAL);
 670
 671         dc->SetFont(fnt);
 672
 673         for (int i = 0; i < 7; i++)
 674         {
 675             wxString word = words[i];
 676             word.Remove( word.Len()-1, 1 );
 677             dc->GetTextExtent(word, &w, &h);
 678             dc->DrawRectangle(x, y, w, h);
 679             dc->GetTextExtent(words[i], &w, &h);
 680             dc->DrawText(words[i], x, y);
 681             x += w;
 682         }
 683
 684     }
 685
 686     dc->SetFont(wxGetApp().GetTestFont());
 687
 688     dc->DrawText(wxT("Some test text"), 200, 300 );
 689
 690     // TESTING
 691
 692     int leftMargin = 20;
 693     int rightMargin = 20;
 694     int topMargin = 20;
 695     int bottomMargin = 20;
 696
 697     int pageWidthMM, pageHeightMM;
 698     GetPageSizeMM(&pageWidthMM, &pageHeightMM);
 699
 700     float leftMarginLogical = (float)(logUnitsFactor*leftMargin);
 701     float topMarginLogical = (float)(logUnitsFactor*topMargin);
 702     float bottomMarginLogical = (float)(logUnitsFactor*(pageHeightMM - bottomMargin));
 703     float rightMarginLogical = (float)(logUnitsFactor*(pageWidthMM - rightMargin));
 704
 705     dc->SetPen(* wxRED_PEN);
 706     dc->DrawLine( (long)leftMarginLogical, (long)topMarginLogical,
 707         (long)rightMarginLogical, (long)topMarginLogical);
 708     dc->DrawLine( (long)leftMarginLogical, (long)bottomMarginLogical,
 709         (long)rightMarginLogical,  (long)bottomMarginLogical);
 710
 711     WritePageHeader(this, dc, wxT("A header"), logUnitsFactor);
 712 }
 713
 714 // Writes a header on a page. Margin units are in millimetres.
 715 bool MyPrintout::WritePageHeader(wxPrintout *printout, wxDC *dc, const wxString&text, float mmToLogical)
 716 {
 717 #if 0
 718     static wxFont *headerFont = (wxFont *) NULL;
 719     if (!headerFont)
 720     {
 721         headerFont = wxTheFontList->FindOrCreateFont(16, wxSWISS, wxNORMAL, wxBOLD);
 722     }
 723     dc->SetFont(headerFont);
 724 #endif
 725
 726     int pageWidthMM, pageHeightMM;
 727
 728     printout->GetPageSizeMM(&pageWidthMM, &pageHeightMM);
 729     wxUnusedVar(pageHeightMM);
 730
 731     int leftMargin = 10;
 732     int topMargin = 10;
 733     int rightMargin = 10;
 734
 735     float leftMarginLogical = (float)(mmToLogical*leftMargin);
 736     float topMarginLogical = (float)(mmToLogical*topMargin);
 737     float rightMarginLogical = (float)(mmToLogical*(pageWidthMM - rightMargin));
 738
 739     wxCoord xExtent, yExtent;
 740     dc->GetTextExtent(text, &xExtent, &yExtent);
 741
 742     float xPos = (float)(((((pageWidthMM - leftMargin - rightMargin)/2.0)+leftMargin)*mmToLogical) - (xExtent/2.0));
 743     dc->DrawText(text, (long)xPos, (long)topMarginLogical);
 744
 745     dc->SetPen(* wxBLACK_PEN);
 746     dc->DrawLine( (long)leftMarginLogical, (long)(topMarginLogical+yExtent),
 747                   (long)rightMarginLogical, (long)topMarginLogical+yExtent );
 748
 749     return true;
 750 }