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 wxHAS_IMAGES_IN_RESOURCES
  55     #include "../sample.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     return true;
 127 }
 128
 129 int MyApp::OnExit()
 130 {
 131     delete g_printData;
 132     delete g_pageSetupData;
 133
 134     return wxApp::OnExit();
 135 }
 136
 137 void MyApp::Draw(wxDC&dc)
 138 {
 139     // This routine just draws a bunch of random stuff on the screen so that we
 140     // can check that different types of object are being drawn consistently
 141     // between the screen image, the print preview image (at various zoom
 142     // levels), and the printed page.
 143     dc.SetBackground(*wxWHITE_BRUSH);
 144     // dc.Clear();
 145     dc.SetFont(m_testFont);
 146
 147     // dc.SetBackgroundMode(wxTRANSPARENT);
 148
 149     dc.SetPen(*wxBLACK_PEN);
 150     dc.SetBrush(*wxLIGHT_GREY_BRUSH);
 151
 152     dc.DrawRectangle(0, 0, 230, 350);
 153     dc.DrawLine(0, 0, 229, 349);
 154     dc.DrawLine(229, 0, 0, 349);
 155     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 156
 157     dc.SetBrush(*wxCYAN_BRUSH);
 158     dc.SetPen(*wxRED_PEN);
 159
 160     dc.DrawRoundedRectangle(0, 20, 200, 80, 20);
 161
 162     dc.DrawText( wxT("Rectangle 200 by 80"), 40, 40);
 163
 164     dc.SetPen( wxPen(*wxBLACK, 0, wxPENSTYLE_DOT_DASH) );
 165     dc.DrawEllipse(50, 140, 100, 50);
 166     dc.SetPen(*wxRED_PEN);
 167
 168     dc.DrawText( wxT("Test message: this is in 10 point text"), 10, 180);
 169
 170 #if wxUSE_UNICODE
 171     const char *test = "Hebrew    שלום -- Japanese (日本語)";
 172     wxString tmp = wxConvUTF8.cMB2WC( test );
 173     dc.DrawText( tmp, 10, 200 );
 174 #endif
 175
 176     wxPoint points[5];
 177     points[0].x = 0;
 178     points[0].y = 0;
 179     points[1].x = 20;
 180     points[1].y = 0;
 181     points[2].x = 20;
 182     points[2].y = 20;
 183     points[3].x = 10;
 184     points[3].y = 20;
 185     points[4].x = 10;
 186     points[4].y = -20;
 187     dc.DrawPolygon( 5, points, 20, 250, wxODDEVEN_RULE );
 188     dc.DrawPolygon( 5, points, 50, 250, wxWINDING_RULE );
 189
 190     dc.DrawEllipticArc( 80, 250, 60, 30, 0.0, 270.0 );
 191
 192     points[0].x = 150;
 193     points[0].y = 250;
 194     points[1].x = 180;
 195     points[1].y = 250;
 196     points[2].x = 180;
 197     points[2].y = 220;
 198     points[3].x = 200;
 199     points[3].y = 220;
 200     dc.DrawSpline( 4, points );
 201
 202     dc.DrawArc( 20,10, 10,10, 25,40 );
 203
 204     wxString str;
 205     int i = 0;
 206     str.Printf( wxT("---- Text at angle %d ----"), i );
 207     dc.DrawRotatedText( str, 100, 300, i );
 208
 209     i = m_angle;
 210     str.Printf( wxT("---- Text at angle %d ----"), i );
 211     dc.DrawRotatedText( str, 100, 300, i );
 212
 213     wxIcon my_icon = wxICON(sample);
 214
 215     dc.DrawIcon( my_icon, 100, 100);
 216
 217     if (m_bitmap.IsOk())
 218         dc.DrawBitmap( m_bitmap, 10, 10 );
 219
 220 #if wxUSE_GRAPHICS_CONTEXT
 221     wxGraphicsContext *gc = NULL;
 222
 223     wxPrinterDC *printer_dc = wxDynamicCast( &dc, wxPrinterDC );
 224     if (printer_dc)
 225         gc = wxGraphicsContext::Create( *printer_dc );
 226
 227     wxWindowDC *window_dc = wxDynamicCast( &dc, wxWindowDC );
 228     if (window_dc)
 229         gc = wxGraphicsContext::Create( *window_dc );
 230
 231 #ifdef __WXMSW__
 232     wxEnhMetaFileDC *emf_dc = wxDynamicCast( &dc, wxEnhMetaFileDC );
 233     if (emf_dc)
 234         gc = wxGraphicsContext::Create( *emf_dc );
 235 #endif
 236
 237     if (gc)
 238     {
 239         // make a path that contains a circle and some lines, centered at 100,100
 240         gc->SetPen( *wxRED_PEN );
 241
 242         wxGraphicsPath path = gc->CreatePath();
 243         path.AddCircle( 50.0, 50.0, 50.0 );
 244         path.MoveToPoint(0.0, 50.0);
 245         path.AddLineToPoint(100.0, 50.0);
 246         path.MoveToPoint(50.0, 0.0);
 247         path.AddLineToPoint(50.0, 100.0 );
 248         path.CloseSubpath();
 249         path.AddRectangle(25.0, 25.0, 50.0, 50.0);
 250
 251         gc->StrokePath(path);
 252
 253         // draw some text
 254         wxString text("Text by wxGraphicsContext");
 255         gc->SetFont( m_testFont, *wxBLACK );
 256         gc->DrawText(text, 25.0, 60.0);
 257
 258         // draw rectangle around the text
 259         double w, h, d, el;
 260         gc->GetTextExtent(text, &w, &h, &d, &el);
 261         gc->SetPen( *wxBLACK_PEN );
 262         gc->DrawRectangle(25.0, 60.0, w, h);
 263
 264         delete gc;
 265     }
 266 #endif
 267 }
 268
 269
 270 // ----------------------------------------------------------------------------
 271 // MyFrame
 272 // ----------------------------------------------------------------------------
 273
 274 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 275     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 276     EVT_MENU(wxID_PRINT, MyFrame::OnPrint)
 277     EVT_MENU(wxID_PREVIEW, MyFrame::OnPrintPreview)
 278     EVT_MENU(WXPRINT_PAGE_SETUP, MyFrame::OnPageSetup)
 279     EVT_MENU(wxID_ABOUT, MyFrame::OnPrintAbout)
 280 #if defined(__WXMSW__) &&wxTEST_POSTSCRIPT_IN_MSW
 281     EVT_MENU(WXPRINT_PRINT_PS, MyFrame::OnPrintPS)
 282     EVT_MENU(WXPRINT_PREVIEW_PS, MyFrame::OnPrintPreviewPS)
 283     EVT_MENU(WXPRINT_PAGE_SETUP_PS, MyFrame::OnPageSetupPS)
 284 #endif
 285 #ifdef __WXMAC__
 286     EVT_MENU(WXPRINT_PAGE_MARGINS, MyFrame::OnPageMargins)
 287 #endif
 288     EVT_MENU(WXPRINT_ANGLEUP, MyFrame::OnAngleUp)
 289     EVT_MENU(WXPRINT_ANGLEDOWN, MyFrame::OnAngleDown)
 290
 291     EVT_MENU_RANGE(WXPRINT_FRAME_MODAL_APP,
 292                    WXPRINT_FRAME_MODAL_NON,
 293                    MyFrame::OnPreviewFrameModalityKind)
 294 END_EVENT_TABLE()
 295
 296 MyFrame::MyFrame(wxFrame *frame, const wxString&title, const wxPoint&pos, const wxSize&size)
 297         : wxFrame(frame, wxID_ANY, title, pos, size)
 298 {
 299     m_canvas = NULL;
 300     m_previewModality = wxPreviewFrame_AppModal;
 301
 302 #if wxUSE_STATUSBAR
 303     // Give us a status line
 304     CreateStatusBar(2);
 305     SetStatusText(wxT("Printing demo"));
 306 #endif // wxUSE_STATUSBAR
 307
 308     // Load icon and bitmap
 309     SetIcon( wxICON( sample) );
 310
 311     // Make a menubar
 312     wxMenu *file_menu = new wxMenu;
 313
 314     file_menu->Append(wxID_PRINT, wxT("&Print..."),                 wxT("Print"));
 315     file_menu->Append(WXPRINT_PAGE_SETUP, wxT("Page Set&up..."),    wxT("Page setup"));
 316 #ifdef __WXMAC__
 317     file_menu->Append(WXPRINT_PAGE_MARGINS, wxT("Page Margins..."), wxT("Page margins"));
 318 #endif
 319     file_menu->Append(wxID_PREVIEW, wxT("Print Pre&view"),          wxT("Preview"));
 320
 321     wxMenu * const menuModalKind = new wxMenu;
 322     menuModalKind->AppendRadioItem(WXPRINT_FRAME_MODAL_APP, "&App modal");
 323     menuModalKind->AppendRadioItem(WXPRINT_FRAME_MODAL_WIN, "&Window modal");
 324     menuModalKind->AppendRadioItem(WXPRINT_FRAME_MODAL_NON, "&Not modal");
 325     file_menu->AppendSubMenu(menuModalKind, "Preview frame &modal kind");
 326 #if wxUSE_ACCEL
 327     // Accelerators
 328     wxAcceleratorEntry entries[1];
 329     entries[0].Set(wxACCEL_CTRL, (int) 'V', wxID_PREVIEW);
 330     wxAcceleratorTable accel(1, entries);
 331     SetAcceleratorTable(accel);
 332 #endif
 333
 334 #if defined(__WXMSW__) &&wxTEST_POSTSCRIPT_IN_MSW
 335     file_menu->AppendSeparator();
 336     file_menu->Append(WXPRINT_PRINT_PS, wxT("Print PostScript..."),           wxT("Print (PostScript)"));
 337     file_menu->Append(WXPRINT_PAGE_SETUP_PS, wxT("Page Setup PostScript..."), wxT("Page setup (PostScript)"));
 338     file_menu->Append(WXPRINT_PREVIEW_PS, wxT("Print Preview PostScript"),    wxT("Preview (PostScript)"));
 339 #endif
 340
 341     file_menu->AppendSeparator();
 342     file_menu->Append(WXPRINT_ANGLEUP, wxT("Angle up\tAlt-U"),                wxT("Raise rotated text angle"));
 343     file_menu->Append(WXPRINT_ANGLEDOWN, wxT("Angle down\tAlt-D"),            wxT("Lower rotated text angle"));
 344     file_menu->AppendSeparator();
 345     file_menu->Append(wxID_EXIT, wxT("E&xit"),                                wxT("Exit program"));
 346
 347     wxMenu *help_menu = new wxMenu;
 348     help_menu->Append(wxID_ABOUT, wxT("&About"),                              wxT("About this demo"));
 349
 350     wxMenuBar *menu_bar = new wxMenuBar;
 351
 352     menu_bar->Append(file_menu, wxT("&File"));
 353     menu_bar->Append(help_menu, wxT("&Help"));
 354
 355     // Associate the menu bar with the frame
 356     SetMenuBar(menu_bar);
 357
 358
 359     // create the canvas
 360     // -----------------
 361
 362     m_canvas = new MyCanvas(this, wxPoint(0, 0), wxSize(100, 100),
 363                             wxRETAINED|wxHSCROLL|wxVSCROLL);
 364
 365     // Give it scrollbars: the virtual canvas is 20 * 50 = 1000 pixels in each direction
 366     m_canvas->SetScrollbars(20, 20, 50, 50);
 367 }
 368
 369 void MyFrame::OnExit(wxCommandEvent& WXUNUSED(event))
 370 {
 371     Close(true /*force closing*/);
 372 }
 373
 374 void MyFrame::OnPrint(wxCommandEvent& WXUNUSED(event))
 375 {
 376     wxPrintDialogData printDialogData(* g_printData);
 377
 378     wxPrinter printer(&printDialogData);
 379     MyPrintout printout(this, wxT("My printout"));
 380     if (!printer.Print(this, &printout, true /*prompt*/))
 381     {
 382         if (wxPrinter::GetLastError() == wxPRINTER_ERROR)
 383         {
 384             wxLogError(wxT("There was a problem printing. Perhaps your current printer is not set correctly?"));
 385         }
 386         else
 387         {
 388             wxLogMessage(wxT("You canceled printing"));
 389         }
 390     }
 391     else
 392     {
 393         (*g_printData) = printer.GetPrintDialogData().GetPrintData();
 394     }
 395 }
 396
 397 void MyFrame::OnPrintPreview(wxCommandEvent& WXUNUSED(event))
 398 {
 399     // Pass two printout objects: for preview, and possible printing.
 400     wxPrintDialogData printDialogData(* g_printData);
 401     wxPrintPreview *preview =
 402         new wxPrintPreview(new MyPrintout(this), new MyPrintout(this), &printDialogData);
 403     if (!preview->IsOk())
 404     {
 405         delete preview;
 406         wxLogError(wxT("There was a problem previewing.\nPerhaps your current printer is not set correctly?"));
 407         return;
 408     }
 409
 410     wxPreviewFrame *frame =
 411         new wxPreviewFrame(preview, this, wxT("Demo Print Preview"), wxPoint(100, 100), wxSize(600, 650));
 412     frame->Centre(wxBOTH);
 413     frame->InitializeWithModality(m_previewModality);
 414     frame->Show();
 415 }
 416
 417 void MyFrame::OnPageSetup(wxCommandEvent& WXUNUSED(event))
 418 {
 419     (*g_pageSetupData) = *g_printData;
 420
 421     wxPageSetupDialog pageSetupDialog(this, g_pageSetupData);
 422     pageSetupDialog.ShowModal();
 423
 424     (*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
 425     (*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
 426 }
 427
 428 #if defined(__WXMSW__) && wxTEST_POSTSCRIPT_IN_MSW
 429 void MyFrame::OnPrintPS(wxCommandEvent& WXUNUSED(event))
 430 {
 431     wxPostScriptPrinter printer(g_printData);
 432     MyPrintout printout(wxT("My printout"));
 433     printer.Print(this, &printout, true/*prompt*/);
 434
 435     (*g_printData) = printer.GetPrintData();
 436 }
 437
 438 void MyFrame::OnPrintPreviewPS(wxCommandEvent& WXUNUSED(event))
 439 {
 440     // Pass two printout objects: for preview, and possible printing.
 441     wxPrintDialogData printDialogData(* g_printData);
 442     wxPrintPreview *preview = new wxPrintPreview(new MyPrintout, new MyPrintout, &printDialogData);
 443     wxPreviewFrame *frame =
 444         new wxPreviewFrame(preview, this, wxT("Demo Print Preview"), wxPoint(100, 100), wxSize(600, 650));
 445     frame->Centre(wxBOTH);
 446     frame->Initialize();
 447     frame->Show();
 448 }
 449
 450 void MyFrame::OnPageSetupPS(wxCommandEvent& WXUNUSED(event))
 451 {
 452     (*g_pageSetupData) = * g_printData;
 453
 454     wxGenericPageSetupDialog pageSetupDialog(this, g_pageSetupData);
 455     pageSetupDialog.ShowModal();
 456
 457     (*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
 458     (*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
 459 }
 460 #endif
 461
 462 #ifdef __WXMAC__
 463 void MyFrame::OnPageMargins(wxCommandEvent& WXUNUSED(event))
 464 {
 465     (*g_pageSetupData) = *g_printData;
 466
 467     wxMacPageMarginsDialog pageMarginsDialog(this, g_pageSetupData);
 468     pageMarginsDialog.ShowModal();
 469
 470     (*g_printData) = pageMarginsDialog.GetPageSetupDialogData().GetPrintData();
 471     (*g_pageSetupData) = pageMarginsDialog.GetPageSetupDialogData();
 472 }
 473 #endif
 474
 475 void MyFrame::OnPrintAbout(wxCommandEvent& WXUNUSED(event))
 476 {
 477     (void)wxMessageBox(wxT("wxWidgets printing demo\nAuthor: Julian Smart"),
 478                        wxT("About wxWidgets printing demo"), wxOK|wxCENTRE);
 479 }
 480
 481 void MyFrame::OnAngleUp(wxCommandEvent& WXUNUSED(event))
 482 {
 483     wxGetApp().IncrementAngle();
 484     m_canvas->Refresh();
 485 }
 486
 487 void MyFrame::OnAngleDown(wxCommandEvent& WXUNUSED(event))
 488 {
 489     wxGetApp().DecrementAngle();
 490     m_canvas->Refresh();
 491 }
 492
 493 void MyFrame::OnPreviewFrameModalityKind(wxCommandEvent& event)
 494 {
 495     m_previewModality = static_cast<wxPreviewFrameModalityKind>(
 496                             wxPreviewFrame_AppModal +
 497                                 (event.GetId() - WXPRINT_FRAME_MODAL_APP));
 498 }
 499
 500 // ----------------------------------------------------------------------------
 501 // MyCanvas
 502 // ----------------------------------------------------------------------------
 503
 504 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 505   //  EVT_PAINT(MyCanvas::OnPaint)
 506 END_EVENT_TABLE()
 507
 508 MyCanvas::MyCanvas(wxFrame *frame, const wxPoint&pos, const wxSize&size, long style)
 509     : wxScrolledWindow(frame, wxID_ANY, pos, size, style)
 510 {
 511     SetBackgroundColour(*wxWHITE);
 512 }
 513
 514 //void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(evt))
 515 void MyCanvas::OnDraw(wxDC& dc)
 516 {
 517     //wxPaintDC dc(this);
 518     wxGetApp().Draw(dc);
 519 }
 520
 521
 522 // ----------------------------------------------------------------------------
 523 // MyPrintout
 524 // ----------------------------------------------------------------------------
 525
 526 bool MyPrintout::OnPrintPage(int page)
 527 {
 528     wxDC *dc = GetDC();
 529     if (dc)
 530     {
 531         if (page == 1)
 532             DrawPageOne();
 533         else if (page == 2)
 534             DrawPageTwo();
 535
 536         // Draw page numbers at top left corner of printable area, sized so that
 537         // screen size of text matches paper size.
 538         MapScreenSizeToPage();
 539
 540         dc->DrawText(wxString::Format(wxT("PAGE %d"), page), 0, 0);
 541
 542         return true;
 543     }
 544     else
 545         return false;
 546 }
 547
 548 bool MyPrintout::OnBeginDocument(int startPage, int endPage)
 549 {
 550     if (!wxPrintout::OnBeginDocument(startPage, endPage))
 551         return false;
 552
 553     return true;
 554 }
 555
 556 void MyPrintout::GetPageInfo(int *minPage, int *maxPage, int *selPageFrom, int *selPageTo)
 557 {
 558     *minPage = 1;
 559     *maxPage = 2;
 560     *selPageFrom = 1;
 561     *selPageTo = 2;
 562 }
 563
 564 bool MyPrintout::HasPage(int pageNum)
 565 {
 566     return (pageNum == 1 || pageNum == 2);
 567 }
 568
 569 void MyPrintout::DrawPageOne()
 570 {
 571     // You might use THIS code if you were scaling graphics of known size to fit
 572     // on the page. The commented-out code illustrates different ways of scaling
 573     // the graphics.
 574
 575     // We know the graphic is 230x350. If we didn't know this, we'd need to
 576     // calculate it.
 577     wxCoord maxX = 230;
 578     wxCoord maxY = 350;
 579
 580     // This sets the user scale and origin of the DC so that the image fits
 581     // within the paper rectangle (but the edges could be cut off by printers
 582     // that can't print to the edges of the paper -- which is most of them. Use
 583     // this if your image already has its own margins.
 584 //    FitThisSizeToPaper(wxSize(maxX, maxY));
 585 //    wxRect fitRect = GetLogicalPaperRect();
 586
 587     // This sets the user scale and origin of the DC so that the image fits
 588     // within the page rectangle, which is the printable area on Mac and MSW
 589     // and is the entire page on other platforms.
 590 //    FitThisSizeToPage(wxSize(maxX, maxY));
 591 //    wxRect fitRect = GetLogicalPageRect();
 592
 593     // This sets the user scale and origin of the DC so that the image fits
 594     // within the page margins as specified by g_PageSetupData, which you can
 595     // change (on some platforms, at least) in the Page Setup dialog. Note that
 596     // on Mac, the native Page Setup dialog doesn't let you change the margins
 597     // of a wxPageSetupDialogData object, so you'll have to write your own dialog or
 598     // use the Mac-only wxMacPageMarginsDialog, as we do in this program.
 599     FitThisSizeToPageMargins(wxSize(maxX, maxY), *g_pageSetupData);
 600     wxRect fitRect = GetLogicalPageMarginsRect(*g_pageSetupData);
 601
 602     // This sets the user scale and origin of the DC so that the image appears
 603     // on the paper at the same size that it appears on screen (i.e., 10-point
 604     // type on screen is 10-point on the printed page) and is positioned in the
 605     // top left corner of the page rectangle (just as the screen image appears
 606     // in the top left corner of the window).
 607 //    MapScreenSizeToPage();
 608 //    wxRect fitRect = GetLogicalPageRect();
 609
 610     // You could also map the screen image to the entire paper at the same size
 611     // as it appears on screen.
 612 //    MapScreenSizeToPaper();
 613 //    wxRect fitRect = GetLogicalPaperRect();
 614
 615     // You might also wish to do you own scaling in order to draw objects at
 616     // full native device resolution. In this case, you should do the following.
 617     // Note that you can use the GetLogicalXXXRect() commands to obtain the
 618     // appropriate rect to scale to.
 619 //    MapScreenSizeToDevice();
 620 //    wxRect fitRect = GetLogicalPageRect();
 621
 622     // Each of the preceding Fit or Map routines positions the origin so that
 623     // the drawn image is positioned at the top left corner of the reference
 624     // rectangle. You can easily center or right- or bottom-justify the image as
 625     // follows.
 626
 627     // This offsets the image so that it is centered within the reference
 628     // rectangle defined above.
 629     wxCoord xoff = (fitRect.width - maxX) / 2;
 630     wxCoord yoff = (fitRect.height - maxY) / 2;
 631     OffsetLogicalOrigin(xoff, yoff);
 632
 633     // This offsets the image so that it is positioned at the bottom right of
 634     // the reference rectangle defined above.
 635 //    wxCoord xoff = (fitRect.width - maxX);
 636 //    wxCoord yoff = (fitRect.height - maxY);
 637 //    OffsetLogicalOrigin(xoff, yoff);
 638
 639     wxGetApp().Draw(*GetDC());
 640 }
 641
 642 void MyPrintout::DrawPageTwo()
 643 {
 644     // You might use THIS code to set the printer DC to ROUGHLY reflect
 645     // the screen text size. This page also draws lines of actual length
 646     // 5cm on the page.
 647
 648     // Compare this to DrawPageOne(), which uses the really convenient routines
 649     // from wxPrintout to fit the screen image onto the printed page. This page
 650     // illustrates how to do all the scaling calculations yourself, if you're so
 651     // inclined.
 652
 653     wxDC *dc = GetDC();
 654
 655     // Get the logical pixels per inch of screen and printer
 656     int ppiScreenX, ppiScreenY;
 657     GetPPIScreen(&ppiScreenX, &ppiScreenY);
 658     int ppiPrinterX, ppiPrinterY;
 659     GetPPIPrinter(&ppiPrinterX, &ppiPrinterY);
 660
 661     // This scales the DC so that the printout roughly represents the screen
 662     // scaling. The text point size _should_ be the right size but in fact is
 663     // too small for some reason. This is a detail that will need to be
 664     // addressed at some point but can be fudged for the moment.
 665     float scale = (float)((float)ppiPrinterX/(float)ppiScreenX);
 666
 667     // Now we have to check in case our real page size is reduced (e.g. because
 668     // we're drawing to a print preview memory DC)
 669     int pageWidth, pageHeight;
 670     int w, h;
 671     dc->GetSize(&w, &h);
 672     GetPageSizePixels(&pageWidth, &pageHeight);
 673
 674     // If printer pageWidth == current DC width, then this doesn't change. But w
 675     // might be the preview bitmap width, so scale down.
 676     float overallScale = scale * (float)(w/(float)pageWidth);
 677     dc->SetUserScale(overallScale, overallScale);
 678
 679     // Calculate conversion factor for converting millimetres into logical
 680     // units. There are approx. 25.4 mm to the inch. There are ppi device units
 681     // to the inch. Therefore 1 mm corresponds to ppi/25.4 device units. We also
 682     // divide by the screen-to-printer scaling factor, because we need to
 683     // unscale to pass logical units to DrawLine.
 684
 685     // Draw 50 mm by 50 mm L shape
 686     float logUnitsFactor = (float)(ppiPrinterX/(scale*25.4));
 687     float logUnits = (float)(50*logUnitsFactor);
 688     dc->SetPen(* wxBLACK_PEN);
 689     dc->DrawLine(50, 250, (long)(50.0 + logUnits), 250);
 690     dc->DrawLine(50, 250, 50, (long)(250.0 + logUnits));
 691
 692     dc->SetBackgroundMode(wxTRANSPARENT);
 693     dc->SetBrush(*wxTRANSPARENT_BRUSH);
 694
 695     { // GetTextExtent demo:
 696         wxString words[7] = { wxT("This "), wxT("is "), wxT("GetTextExtent "),
 697                              wxT("testing "), wxT("string. "), wxT("Enjoy "), wxT("it!") };
 698         wxCoord w, h;
 699         long x = 200, y= 250;
 700         wxFont fnt(15, wxSWISS, wxNORMAL, wxNORMAL);
 701
 702         dc->SetFont(fnt);
 703
 704         for (int i = 0; i < 7; i++)
 705         {
 706             wxString word = words[i];
 707             word.Remove( word.Len()-1, 1 );
 708             dc->GetTextExtent(word, &w, &h);
 709             dc->DrawRectangle(x, y, w, h);
 710             dc->GetTextExtent(words[i], &w, &h);
 711             dc->DrawText(words[i], x, y);
 712             x += w;
 713         }
 714
 715     }
 716
 717     dc->SetFont(wxGetApp().GetTestFont());
 718
 719     dc->DrawText(wxT("Some test text"), 200, 300 );
 720
 721     // TESTING
 722
 723     int leftMargin = 20;
 724     int rightMargin = 20;
 725     int topMargin = 20;
 726     int bottomMargin = 20;
 727
 728     int pageWidthMM, pageHeightMM;
 729     GetPageSizeMM(&pageWidthMM, &pageHeightMM);
 730
 731     float leftMarginLogical = (float)(logUnitsFactor*leftMargin);
 732     float topMarginLogical = (float)(logUnitsFactor*topMargin);
 733     float bottomMarginLogical = (float)(logUnitsFactor*(pageHeightMM - bottomMargin));
 734     float rightMarginLogical = (float)(logUnitsFactor*(pageWidthMM - rightMargin));
 735
 736     dc->SetPen(* wxRED_PEN);
 737     dc->DrawLine( (long)leftMarginLogical, (long)topMarginLogical,
 738         (long)rightMarginLogical, (long)topMarginLogical);
 739     dc->DrawLine( (long)leftMarginLogical, (long)bottomMarginLogical,
 740         (long)rightMarginLogical,  (long)bottomMarginLogical);
 741
 742     WritePageHeader(this, dc, wxT("A header"), logUnitsFactor);
 743 }
 744
 745 // Writes a header on a page. Margin units are in millimetres.
 746 bool MyPrintout::WritePageHeader(wxPrintout *printout, wxDC *dc, const wxString&text, float mmToLogical)
 747 {
 748 #if 0
 749     static wxFont *headerFont = (wxFont *) NULL;
 750     if (!headerFont)
 751     {
 752         headerFont = wxTheFontList->FindOrCreateFont(16, wxSWISS, wxNORMAL, wxBOLD);
 753     }
 754     dc->SetFont(headerFont);
 755 #endif
 756
 757     int pageWidthMM, pageHeightMM;
 758
 759     printout->GetPageSizeMM(&pageWidthMM, &pageHeightMM);
 760     wxUnusedVar(pageHeightMM);
 761
 762     int leftMargin = 10;
 763     int topMargin = 10;
 764     int rightMargin = 10;
 765
 766     float leftMarginLogical = (float)(mmToLogical*leftMargin);
 767     float topMarginLogical = (float)(mmToLogical*topMargin);
 768     float rightMarginLogical = (float)(mmToLogical*(pageWidthMM - rightMargin));
 769
 770     wxCoord xExtent, yExtent;
 771     dc->GetTextExtent(text, &xExtent, &yExtent);
 772
 773     float xPos = (float)(((((pageWidthMM - leftMargin - rightMargin)/2.0)+leftMargin)*mmToLogical) - (xExtent/2.0));
 774     dc->DrawText(text, (long)xPos, (long)topMarginLogical);
 775
 776     dc->SetPen(* wxBLACK_PEN);
 777     dc->DrawLine( (long)leftMarginLogical, (long)(topMarginLogical+yExtent),
 778                   (long)rightMarginLogical, (long)topMarginLogical+yExtent );
 779
 780     return true;
 781 }