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 // Copyright:   (c) Julian Smart
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx/wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 #ifndef WX_PRECOMP
  19     #include "wx/wx.h"
  20     #include "wx/log.h"
  21 #endif
  22
  23 #if !wxUSE_PRINTING_ARCHITECTURE
  24     #error "You must set wxUSE_PRINTING_ARCHITECTURE to 1 in setup.h, and recompile the library."
  25 #endif
  26
  27 #include <ctype.h>
  28 #include "wx/metafile.h"
  29 #include "wx/print.h"
  30 #include "wx/printdlg.h"
  31 #include "wx/image.h"
  32 #include "wx/accel.h"
  33
  34 #if wxUSE_POSTSCRIPT
  35     #include "wx/generic/printps.h"
  36     #include "wx/generic/prntdlgg.h"
  37 #endif
  38
  39 #if wxUSE_GRAPHICS_CONTEXT
  40     #include "wx/graphics.h"
  41 #endif
  42
  43 #ifdef __WXMAC__
  44     #include "wx/osx/printdlg.h"
  45 #endif
  46
  47 #include "printing.h"
  48
  49 #ifndef wxHAS_IMAGES_IN_RESOURCES
  50     #include "../sample.xpm"
  51 #endif
  52
  53 // Global print data, to remember settings during the session
  54 wxPrintData *g_printData = NULL;
  55
  56 // Global page setup data
  57 wxPageSetupDialogData* g_pageSetupData = NULL;
  58
  59
  60
  61 // ----------------------------------------------------------------------------
  62 // MyApp
  63 // ----------------------------------------------------------------------------
  64
  65 IMPLEMENT_APP(MyApp)
  66
  67 bool MyApp::OnInit(void)
  68 {
  69     if ( !wxApp::OnInit() )
  70         return false;
  71
  72     wxInitAllImageHandlers();
  73
  74
  75     // init global objects
  76     // -------------------
  77
  78     g_printData = new wxPrintData;
  79
  80     // You could set an initial paper size here
  81 #if 0
  82     g_printData->SetPaperId(wxPAPER_LETTER); // for Americans
  83     g_printData->SetPaperId(wxPAPER_A4);    // for everyone else
  84 #endif
  85
  86     g_pageSetupData = new wxPageSetupDialogData;
  87
  88     // copy over initial paper size from print record
  89     (*g_pageSetupData) = *g_printData;
  90
  91     // Set some initial page margins in mm.
  92     g_pageSetupData->SetMarginTopLeft(wxPoint(15, 15));
  93     g_pageSetupData->SetMarginBottomRight(wxPoint(15, 15));
  94
  95
  96     // init local GUI objects
  97     // ----------------------
  98
  99 #if 0
 100     wxImage image( wxT("test.jpg") );
 101     image.SetAlpha();
 102     int i,j;
 103     for (i = 0; i < image.GetWidth(); i++)
 104        for (j = 0; j < image.GetHeight(); j++)
 105           image.SetAlpha( i, j, 50 );
 106     m_bitmap = image;
 107 #endif
 108     m_angle = 30;
 109     m_testFont.Create(10, wxFONTFAMILY_SWISS, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
 110
 111
 112     // Create the main frame window
 113     // ----------------------------
 114
 115     MyFrame* frame = new MyFrame((wxFrame *) NULL, wxT("wxWidgets Printing Demo"),
 116                                  wxPoint(0, 0), wxSize(400, 400));
 117
 118     frame->Centre(wxBOTH);
 119     frame->Show();
 120
 121     return true;
 122 }
 123
 124 int MyApp::OnExit()
 125 {
 126     delete g_printData;
 127     delete g_pageSetupData;
 128
 129     return wxApp::OnExit();
 130 }
 131
 132 void MyApp::Draw(wxDC&dc)
 133 {
 134     // This routine just draws a bunch of random stuff on the screen so that we
 135     // can check that different types of object are being drawn consistently
 136     // between the screen image, the print preview image (at various zoom
 137     // levels), and the printed page.
 138     dc.SetBackground(*wxWHITE_BRUSH);
 139     // dc.Clear();
 140     dc.SetFont(m_testFont);
 141
 142     // dc.SetBackgroundMode(wxTRANSPARENT);
 143
 144     dc.SetPen(*wxBLACK_PEN);
 145     dc.SetBrush(*wxLIGHT_GREY_BRUSH);
 146
 147     dc.DrawRectangle(0, 0, 230, 350);
 148     dc.DrawLine(0, 0, 229, 349);
 149     dc.DrawLine(229, 0, 0, 349);
 150     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 151
 152     dc.SetBrush(*wxCYAN_BRUSH);
 153     dc.SetPen(*wxRED_PEN);
 154
 155     dc.DrawRoundedRectangle(0, 20, 200, 80, 20);
 156
 157     dc.DrawText( wxT("Rectangle 200 by 80"), 40, 40);
 158
 159     dc.SetPen( wxPen(*wxBLACK, 0, wxPENSTYLE_DOT_DASH) );
 160     dc.DrawEllipse(50, 140, 100, 50);
 161     dc.SetPen(*wxRED_PEN);
 162
 163     dc.DrawText( wxT("Test message: this is in 10 point text"), 10, 180);
 164
 165 #if wxUSE_UNICODE
 166     const char *test = "Hebrew    שלום -- Japanese (日本語)";
 167     wxString tmp = wxConvUTF8.cMB2WC( test );
 168     dc.DrawText( tmp, 10, 200 );
 169 #endif
 170
 171     wxPoint points[5];
 172     points[0].x = 0;
 173     points[0].y = 0;
 174     points[1].x = 20;
 175     points[1].y = 0;
 176     points[2].x = 20;
 177     points[2].y = 20;
 178     points[3].x = 10;
 179     points[3].y = 20;
 180     points[4].x = 10;
 181     points[4].y = -20;
 182     dc.DrawPolygon( 5, points, 20, 250, wxODDEVEN_RULE );
 183     dc.DrawPolygon( 5, points, 50, 250, wxWINDING_RULE );
 184
 185     dc.DrawEllipticArc( 80, 250, 60, 30, 0.0, 270.0 );
 186
 187     points[0].x = 150;
 188     points[0].y = 250;
 189     points[1].x = 180;
 190     points[1].y = 250;
 191     points[2].x = 180;
 192     points[2].y = 220;
 193     points[3].x = 200;
 194     points[3].y = 220;
 195     dc.DrawSpline( 4, points );
 196
 197     dc.DrawArc( 20,10, 10,10, 25,40 );
 198
 199     wxString str;
 200     int i = 0;
 201     str.Printf( wxT("---- Text at angle %d ----"), i );
 202     dc.DrawRotatedText( str, 100, 300, i );
 203
 204     i = m_angle;
 205     str.Printf( wxT("---- Text at angle %d ----"), i );
 206     dc.DrawRotatedText( str, 100, 300, i );
 207
 208     wxIcon my_icon = wxICON(sample);
 209
 210     dc.DrawIcon( my_icon, 100, 100);
 211
 212     if (m_bitmap.IsOk())
 213         dc.DrawBitmap( m_bitmap, 10, 10 );
 214
 215 #if wxUSE_GRAPHICS_CONTEXT
 216     wxGraphicsContext *gc = NULL;
 217
 218     wxPrinterDC *printer_dc = wxDynamicCast( &dc, wxPrinterDC );
 219     if (printer_dc)
 220         gc = wxGraphicsContext::Create( *printer_dc );
 221
 222     wxWindowDC *window_dc = wxDynamicCast( &dc, wxWindowDC );
 223     if (window_dc)
 224         gc = wxGraphicsContext::Create( *window_dc );
 225
 226 #ifdef __WXMSW__
 227     wxEnhMetaFileDC *emf_dc = wxDynamicCast( &dc, wxEnhMetaFileDC );
 228     if (emf_dc)
 229         gc = wxGraphicsContext::Create( *emf_dc );
 230 #endif
 231
 232     if (gc)
 233     {
 234         // make a path that contains a circle and some lines, centered at 100,100
 235         gc->SetPen( *wxRED_PEN );
 236
 237         wxGraphicsPath path = gc->CreatePath();
 238         path.AddCircle( 50.0, 50.0, 50.0 );
 239         path.MoveToPoint(0.0, 50.0);
 240         path.AddLineToPoint(100.0, 50.0);
 241         path.MoveToPoint(50.0, 0.0);
 242         path.AddLineToPoint(50.0, 100.0 );
 243         path.CloseSubpath();
 244         path.AddRectangle(25.0, 25.0, 50.0, 50.0);
 245
 246         gc->StrokePath(path);
 247
 248         // draw some text
 249         wxString text("Text by wxGraphicsContext");
 250         gc->SetFont( m_testFont, *wxBLACK );
 251         gc->DrawText(text, 25.0, 60.0);
 252
 253         // draw rectangle around the text
 254         double w, h, d, el;
 255         gc->GetTextExtent(text, &w, &h, &d, &el);
 256         gc->SetPen( *wxBLACK_PEN );
 257         gc->DrawRectangle(25.0, 60.0, w, h);
 258
 259         delete gc;
 260     }
 261 #endif
 262 }
 263
 264
 265 // ----------------------------------------------------------------------------
 266 // MyFrame
 267 // ----------------------------------------------------------------------------
 268
 269 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 270     EVT_MENU(wxID_EXIT, MyFrame::OnExit)
 271     EVT_MENU(wxID_PRINT, MyFrame::OnPrint)
 272     EVT_MENU(wxID_PREVIEW, MyFrame::OnPrintPreview)
 273     EVT_MENU(WXPRINT_PAGE_SETUP, MyFrame::OnPageSetup)
 274     EVT_MENU(wxID_ABOUT, MyFrame::OnPrintAbout)
 275 #if wxUSE_POSTSCRIPT
 276     EVT_MENU(WXPRINT_PRINT_PS, MyFrame::OnPrintPS)
 277     EVT_MENU(WXPRINT_PREVIEW_PS, MyFrame::OnPrintPreviewPS)
 278     EVT_MENU(WXPRINT_PAGE_SETUP_PS, MyFrame::OnPageSetupPS)
 279 #endif
 280 #ifdef __WXMAC__
 281     EVT_MENU(WXPRINT_PAGE_MARGINS, MyFrame::OnPageMargins)
 282 #endif
 283     EVT_MENU(WXPRINT_ANGLEUP, MyFrame::OnAngleUp)
 284     EVT_MENU(WXPRINT_ANGLEDOWN, MyFrame::OnAngleDown)
 285
 286     EVT_MENU_RANGE(WXPRINT_FRAME_MODAL_APP,
 287                    WXPRINT_FRAME_MODAL_NON,
 288                    MyFrame::OnPreviewFrameModalityKind)
 289 END_EVENT_TABLE()
 290
 291 MyFrame::MyFrame(wxFrame *frame, const wxString&title, const wxPoint&pos, const wxSize&size)
 292         : wxFrame(frame, wxID_ANY, title, pos, size)
 293 {
 294     m_canvas = NULL;
 295     m_previewModality = wxPreviewFrame_AppModal;
 296
 297 #if wxUSE_STATUSBAR
 298     // Give us a status line
 299     CreateStatusBar(2);
 300     SetStatusText(wxT("Printing demo"));
 301 #endif // wxUSE_STATUSBAR
 302
 303     // Load icon and bitmap
 304     SetIcon( wxICON( sample) );
 305
 306     // Make a menubar
 307     wxMenu *file_menu = new wxMenu;
 308
 309     file_menu->Append(wxID_PRINT, wxT("&Print..."),                 wxT("Print"));
 310     file_menu->Append(WXPRINT_PAGE_SETUP, wxT("Page Set&up..."),    wxT("Page setup"));
 311 #ifdef __WXMAC__
 312     file_menu->Append(WXPRINT_PAGE_MARGINS, wxT("Page Margins..."), wxT("Page margins"));
 313 #endif
 314     file_menu->Append(wxID_PREVIEW, wxT("Print Pre&view"),          wxT("Preview"));
 315
 316     wxMenu * const menuModalKind = new wxMenu;
 317     menuModalKind->AppendRadioItem(WXPRINT_FRAME_MODAL_APP, "&App modal");
 318     menuModalKind->AppendRadioItem(WXPRINT_FRAME_MODAL_WIN, "&Window modal");
 319     menuModalKind->AppendRadioItem(WXPRINT_FRAME_MODAL_NON, "&Not modal");
 320     file_menu->AppendSubMenu(menuModalKind, "Preview frame &modal kind");
 321 #if wxUSE_ACCEL
 322     // Accelerators
 323     wxAcceleratorEntry entries[1];
 324     entries[0].Set(wxACCEL_CTRL, (int) 'V', wxID_PREVIEW);
 325     wxAcceleratorTable accel(1, entries);
 326     SetAcceleratorTable(accel);
 327 #endif
 328
 329 #if wxUSE_POSTSCRIPT
 330     file_menu->AppendSeparator();
 331     file_menu->Append(WXPRINT_PRINT_PS, wxT("Print PostScript..."),           wxT("Print (PostScript)"));
 332     file_menu->Append(WXPRINT_PAGE_SETUP_PS, wxT("Page Setup PostScript..."), wxT("Page setup (PostScript)"));
 333     file_menu->Append(WXPRINT_PREVIEW_PS, wxT("Print Preview PostScript"),    wxT("Preview (PostScript)"));
 334 #endif
 335
 336     file_menu->AppendSeparator();
 337     file_menu->Append(WXPRINT_ANGLEUP, wxT("Angle up\tAlt-U"),                wxT("Raise rotated text angle"));
 338     file_menu->Append(WXPRINT_ANGLEDOWN, wxT("Angle down\tAlt-D"),            wxT("Lower rotated text angle"));
 339     file_menu->AppendSeparator();
 340     file_menu->Append(wxID_EXIT, wxT("E&xit"),                                wxT("Exit program"));
 341
 342     wxMenu *help_menu = new wxMenu;
 343     help_menu->Append(wxID_ABOUT, wxT("&About"),                              wxT("About this demo"));
 344
 345     wxMenuBar *menu_bar = new wxMenuBar;
 346
 347     menu_bar->Append(file_menu, wxT("&File"));
 348     menu_bar->Append(help_menu, wxT("&Help"));
 349
 350     // Associate the menu bar with the frame
 351     SetMenuBar(menu_bar);
 352
 353
 354     // create the canvas
 355     // -----------------
 356
 357     m_canvas = new MyCanvas(this, wxPoint(0, 0), wxSize(100, 100),
 358                             wxRETAINED|wxHSCROLL|wxVSCROLL);
 359
 360     // Give it scrollbars: the virtual canvas is 20 * 50 = 1000 pixels in each direction
 361     m_canvas->SetScrollbars(20, 20, 50, 50);
 362 }
 363
 364 void MyFrame::OnExit(wxCommandEvent& WXUNUSED(event))
 365 {
 366     Close(true /*force closing*/);
 367 }
 368
 369 void MyFrame::OnPrint(wxCommandEvent& WXUNUSED(event))
 370 {
 371     wxPrintDialogData printDialogData(* g_printData);
 372
 373     wxPrinter printer(&printDialogData);
 374     MyPrintout printout(this, wxT("My printout"));
 375     if (!printer.Print(this, &printout, true /*prompt*/))
 376     {
 377         if (wxPrinter::GetLastError() == wxPRINTER_ERROR)
 378         {
 379             wxLogError(wxT("There was a problem printing. Perhaps your current printer is not set correctly?"));
 380         }
 381         else
 382         {
 383             wxLogMessage(wxT("You canceled printing"));
 384         }
 385     }
 386     else
 387     {
 388         (*g_printData) = printer.GetPrintDialogData().GetPrintData();
 389     }
 390 }
 391
 392 void MyFrame::OnPrintPreview(wxCommandEvent& WXUNUSED(event))
 393 {
 394     // Pass two printout objects: for preview, and possible printing.
 395     wxPrintDialogData printDialogData(* g_printData);
 396     wxPrintPreview *preview =
 397         new wxPrintPreview(new MyPrintout(this), new MyPrintout(this), &printDialogData);
 398     if (!preview->IsOk())
 399     {
 400         delete preview;
 401         wxLogError(wxT("There was a problem previewing.\nPerhaps your current printer is not set correctly?"));
 402         return;
 403     }
 404
 405     wxPreviewFrame *frame =
 406         new wxPreviewFrame(preview, this, wxT("Demo Print Preview"), wxPoint(100, 100), wxSize(600, 650));
 407     frame->Centre(wxBOTH);
 408     frame->InitializeWithModality(m_previewModality);
 409     frame->Show();
 410 }
 411
 412 void MyFrame::OnPageSetup(wxCommandEvent& WXUNUSED(event))
 413 {
 414     (*g_pageSetupData) = *g_printData;
 415
 416     wxPageSetupDialog pageSetupDialog(this, g_pageSetupData);
 417     pageSetupDialog.ShowModal();
 418
 419     (*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
 420     (*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
 421 }
 422
 423 #if wxUSE_POSTSCRIPT
 424 void MyFrame::OnPrintPS(wxCommandEvent& WXUNUSED(event))
 425 {
 426     wxPrintDialogData printDialogData(* g_printData);
 427
 428     wxPostScriptPrinter printer(&printDialogData);
 429     MyPrintout printout(this, wxT("My printout"));
 430     printer.Print(this, &printout, true/*prompt*/);
 431
 432     (*g_printData) = printer.GetPrintDialogData().GetPrintData();
 433 }
 434
 435 void MyFrame::OnPrintPreviewPS(wxCommandEvent& WXUNUSED(event))
 436 {
 437     // Pass two printout objects: for preview, and possible printing.
 438     wxPrintDialogData printDialogData(* g_printData);
 439     wxPrintPreview *preview = new wxPrintPreview(new MyPrintout(this), new MyPrintout(this), &printDialogData);
 440     wxPreviewFrame *frame =
 441         new wxPreviewFrame(preview, this, wxT("Demo Print Preview"), wxPoint(100, 100), wxSize(600, 650));
 442     frame->Centre(wxBOTH);
 443     frame->Initialize();
 444     frame->Show();
 445 }
 446
 447 void MyFrame::OnPageSetupPS(wxCommandEvent& WXUNUSED(event))
 448 {
 449     (*g_pageSetupData) = * g_printData;
 450
 451     wxGenericPageSetupDialog pageSetupDialog(this, g_pageSetupData);
 452     pageSetupDialog.ShowModal();
 453
 454     (*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
 455     (*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
 456 }
 457 #endif
 458
 459 #ifdef __WXMAC__
 460 void MyFrame::OnPageMargins(wxCommandEvent& WXUNUSED(event))
 461 {
 462     (*g_pageSetupData) = *g_printData;
 463
 464     wxMacPageMarginsDialog pageMarginsDialog(this, g_pageSetupData);
 465     pageMarginsDialog.ShowModal();
 466
 467     (*g_printData) = pageMarginsDialog.GetPageSetupDialogData().GetPrintData();
 468     (*g_pageSetupData) = pageMarginsDialog.GetPageSetupDialogData();
 469 }
 470 #endif
 471
 472 void MyFrame::OnPrintAbout(wxCommandEvent& WXUNUSED(event))
 473 {
 474     (void)wxMessageBox(wxT("wxWidgets printing demo\nAuthor: Julian Smart"),
 475                        wxT("About wxWidgets printing demo"), wxOK|wxCENTRE);
 476 }
 477
 478 void MyFrame::OnAngleUp(wxCommandEvent& WXUNUSED(event))
 479 {
 480     wxGetApp().IncrementAngle();
 481     m_canvas->Refresh();
 482 }
 483
 484 void MyFrame::OnAngleDown(wxCommandEvent& WXUNUSED(event))
 485 {
 486     wxGetApp().DecrementAngle();
 487     m_canvas->Refresh();
 488 }
 489
 490 void MyFrame::OnPreviewFrameModalityKind(wxCommandEvent& event)
 491 {
 492     m_previewModality = static_cast<wxPreviewFrameModalityKind>(
 493                             wxPreviewFrame_AppModal +
 494                                 (event.GetId() - WXPRINT_FRAME_MODAL_APP));
 495 }
 496
 497 // ----------------------------------------------------------------------------
 498 // MyCanvas
 499 // ----------------------------------------------------------------------------
 500
 501 BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
 502   //  EVT_PAINT(MyCanvas::OnPaint)
 503 END_EVENT_TABLE()
 504
 505 MyCanvas::MyCanvas(wxFrame *frame, const wxPoint&pos, const wxSize&size, long style)
 506     : wxScrolledWindow(frame, wxID_ANY, pos, size, style)
 507 {
 508     SetBackgroundColour(*wxWHITE);
 509 }
 510
 511 //void MyCanvas::OnPaint(wxPaintEvent& WXUNUSED(evt))
 512 void MyCanvas::OnDraw(wxDC& dc)
 513 {
 514     //wxPaintDC dc(this);
 515     wxGetApp().Draw(dc);
 516 }
 517
 518
 519 // ----------------------------------------------------------------------------
 520 // MyPrintout
 521 // ----------------------------------------------------------------------------
 522
 523 bool MyPrintout::OnPrintPage(int page)
 524 {
 525     wxDC *dc = GetDC();
 526     if (dc)
 527     {
 528         if (page == 1)
 529             DrawPageOne();
 530         else if (page == 2)
 531             DrawPageTwo();
 532
 533         // Draw page numbers at top left corner of printable area, sized so that
 534         // screen size of text matches paper size.
 535         MapScreenSizeToPage();
 536
 537         dc->DrawText(wxString::Format(wxT("PAGE %d"), page), 0, 0);
 538
 539         return true;
 540     }
 541     else
 542         return false;
 543 }
 544
 545 bool MyPrintout::OnBeginDocument(int startPage, int endPage)
 546 {
 547     if (!wxPrintout::OnBeginDocument(startPage, endPage))
 548         return false;
 549
 550     return true;
 551 }
 552
 553 void MyPrintout::GetPageInfo(int *minPage, int *maxPage, int *selPageFrom, int *selPageTo)
 554 {
 555     *minPage = 1;
 556     *maxPage = 2;
 557     *selPageFrom = 1;
 558     *selPageTo = 2;
 559 }
 560
 561 bool MyPrintout::HasPage(int pageNum)
 562 {
 563     return (pageNum == 1 || pageNum == 2);
 564 }
 565
 566 void MyPrintout::DrawPageOne()
 567 {
 568     // You might use THIS code if you were scaling graphics of known size to fit
 569     // on the page. The commented-out code illustrates different ways of scaling
 570     // the graphics.
 571
 572     // We know the graphic is 230x350. If we didn't know this, we'd need to
 573     // calculate it.
 574     wxCoord maxX = 230;
 575     wxCoord maxY = 350;
 576
 577     // This sets the user scale and origin of the DC so that the image fits
 578     // within the paper rectangle (but the edges could be cut off by printers
 579     // that can't print to the edges of the paper -- which is most of them. Use
 580     // this if your image already has its own margins.
 581 //    FitThisSizeToPaper(wxSize(maxX, maxY));
 582 //    wxRect fitRect = GetLogicalPaperRect();
 583
 584     // This sets the user scale and origin of the DC so that the image fits
 585     // within the page rectangle, which is the printable area on Mac and MSW
 586     // and is the entire page on other platforms.
 587 //    FitThisSizeToPage(wxSize(maxX, maxY));
 588 //    wxRect fitRect = GetLogicalPageRect();
 589
 590     // This sets the user scale and origin of the DC so that the image fits
 591     // within the page margins as specified by g_PageSetupData, which you can
 592     // change (on some platforms, at least) in the Page Setup dialog. Note that
 593     // on Mac, the native Page Setup dialog doesn't let you change the margins
 594     // of a wxPageSetupDialogData object, so you'll have to write your own dialog or
 595     // use the Mac-only wxMacPageMarginsDialog, as we do in this program.
 596     FitThisSizeToPageMargins(wxSize(maxX, maxY), *g_pageSetupData);
 597     wxRect fitRect = GetLogicalPageMarginsRect(*g_pageSetupData);
 598
 599     // This sets the user scale and origin of the DC so that the image appears
 600     // on the paper at the same size that it appears on screen (i.e., 10-point
 601     // type on screen is 10-point on the printed page) and is positioned in the
 602     // top left corner of the page rectangle (just as the screen image appears
 603     // in the top left corner of the window).
 604 //    MapScreenSizeToPage();
 605 //    wxRect fitRect = GetLogicalPageRect();
 606
 607     // You could also map the screen image to the entire paper at the same size
 608     // as it appears on screen.
 609 //    MapScreenSizeToPaper();
 610 //    wxRect fitRect = GetLogicalPaperRect();
 611
 612     // You might also wish to do you own scaling in order to draw objects at
 613     // full native device resolution. In this case, you should do the following.
 614     // Note that you can use the GetLogicalXXXRect() commands to obtain the
 615     // appropriate rect to scale to.
 616 //    MapScreenSizeToDevice();
 617 //    wxRect fitRect = GetLogicalPageRect();
 618
 619     // Each of the preceding Fit or Map routines positions the origin so that
 620     // the drawn image is positioned at the top left corner of the reference
 621     // rectangle. You can easily center or right- or bottom-justify the image as
 622     // follows.
 623
 624     // This offsets the image so that it is centered within the reference
 625     // rectangle defined above.
 626     wxCoord xoff = (fitRect.width - maxX) / 2;
 627     wxCoord yoff = (fitRect.height - maxY) / 2;
 628     OffsetLogicalOrigin(xoff, yoff);
 629
 630     // This offsets the image so that it is positioned at the bottom right of
 631     // the reference rectangle defined above.
 632 //    wxCoord xoff = (fitRect.width - maxX);
 633 //    wxCoord yoff = (fitRect.height - maxY);
 634 //    OffsetLogicalOrigin(xoff, yoff);
 635
 636     wxGetApp().Draw(*GetDC());
 637 }
 638
 639 void MyPrintout::DrawPageTwo()
 640 {
 641     // You might use THIS code to set the printer DC to ROUGHLY reflect
 642     // the screen text size. This page also draws lines of actual length
 643     // 5cm on the page.
 644
 645     // Compare this to DrawPageOne(), which uses the really convenient routines
 646     // from wxPrintout to fit the screen image onto the printed page. This page
 647     // illustrates how to do all the scaling calculations yourself, if you're so
 648     // inclined.
 649
 650     wxDC *dc = GetDC();
 651
 652     // Get the logical pixels per inch of screen and printer
 653     int ppiScreenX, ppiScreenY;
 654     GetPPIScreen(&ppiScreenX, &ppiScreenY);
 655     int ppiPrinterX, ppiPrinterY;
 656     GetPPIPrinter(&ppiPrinterX, &ppiPrinterY);
 657
 658     // This scales the DC so that the printout roughly represents the screen
 659     // scaling. The text point size _should_ be the right size but in fact is
 660     // too small for some reason. This is a detail that will need to be
 661     // addressed at some point but can be fudged for the moment.
 662     float scale = (float)((float)ppiPrinterX/(float)ppiScreenX);
 663
 664     // Now we have to check in case our real page size is reduced (e.g. because
 665     // we're drawing to a print preview memory DC)
 666     int pageWidth, pageHeight;
 667     int w, h;
 668     dc->GetSize(&w, &h);
 669     GetPageSizePixels(&pageWidth, &pageHeight);
 670
 671     // If printer pageWidth == current DC width, then this doesn't change. But w
 672     // might be the preview bitmap width, so scale down.
 673     float overallScale = scale * (float)(w/(float)pageWidth);
 674     dc->SetUserScale(overallScale, overallScale);
 675
 676     // Calculate conversion factor for converting millimetres into logical
 677     // units. There are approx. 25.4 mm to the inch. There are ppi device units
 678     // to the inch. Therefore 1 mm corresponds to ppi/25.4 device units. We also
 679     // divide by the screen-to-printer scaling factor, because we need to
 680     // unscale to pass logical units to DrawLine.
 681
 682     // Draw 50 mm by 50 mm L shape
 683     float logUnitsFactor = (float)(ppiPrinterX/(scale*25.4));
 684     float logUnits = (float)(50*logUnitsFactor);
 685     dc->SetPen(* wxBLACK_PEN);
 686     dc->DrawLine(50, 250, (long)(50.0 + logUnits), 250);
 687     dc->DrawLine(50, 250, 50, (long)(250.0 + logUnits));
 688
 689     dc->SetBackgroundMode(wxTRANSPARENT);
 690     dc->SetBrush(*wxTRANSPARENT_BRUSH);
 691
 692     { // GetTextExtent demo:
 693         wxString words[7] = { wxT("This "), wxT("is "), wxT("GetTextExtent "),
 694                              wxT("testing "), wxT("string. "), wxT("Enjoy "), wxT("it!") };
 695         wxCoord w, h;
 696         long x = 200, y= 250;
 697         wxFont fnt(15, wxSWISS, wxNORMAL, wxNORMAL);
 698
 699         dc->SetFont(fnt);
 700
 701         for (int i = 0; i < 7; i++)
 702         {
 703             wxString word = words[i];
 704             word.Remove( word.Len()-1, 1 );
 705             dc->GetTextExtent(word, &w, &h);
 706             dc->DrawRectangle(x, y, w, h);
 707             dc->GetTextExtent(words[i], &w, &h);
 708             dc->DrawText(words[i], x, y);
 709             x += w;
 710         }
 711
 712     }
 713
 714     dc->SetFont(wxGetApp().GetTestFont());
 715
 716     dc->DrawText(wxT("Some test text"), 200, 300 );
 717
 718     // TESTING
 719
 720     int leftMargin = 20;
 721     int rightMargin = 20;
 722     int topMargin = 20;
 723     int bottomMargin = 20;
 724
 725     int pageWidthMM, pageHeightMM;
 726     GetPageSizeMM(&pageWidthMM, &pageHeightMM);
 727
 728     float leftMarginLogical = (float)(logUnitsFactor*leftMargin);
 729     float topMarginLogical = (float)(logUnitsFactor*topMargin);
 730     float bottomMarginLogical = (float)(logUnitsFactor*(pageHeightMM - bottomMargin));
 731     float rightMarginLogical = (float)(logUnitsFactor*(pageWidthMM - rightMargin));
 732
 733     dc->SetPen(* wxRED_PEN);
 734     dc->DrawLine( (long)leftMarginLogical, (long)topMarginLogical,
 735         (long)rightMarginLogical, (long)topMarginLogical);
 736     dc->DrawLine( (long)leftMarginLogical, (long)bottomMarginLogical,
 737         (long)rightMarginLogical,  (long)bottomMarginLogical);
 738
 739     WritePageHeader(this, dc, wxT("A header"), logUnitsFactor);
 740 }
 741
 742 // Writes a header on a page. Margin units are in millimetres.
 743 bool MyPrintout::WritePageHeader(wxPrintout *printout, wxDC *dc, const wxString&text, float mmToLogical)
 744 {
 745 #if 0
 746     static wxFont *headerFont = (wxFont *) NULL;
 747     if (!headerFont)
 748     {
 749         headerFont = wxTheFontList->FindOrCreateFont(16, wxSWISS, wxNORMAL, wxBOLD);
 750     }
 751     dc->SetFont(headerFont);
 752 #endif
 753
 754     int pageWidthMM, pageHeightMM;
 755
 756     printout->GetPageSizeMM(&pageWidthMM, &pageHeightMM);
 757     wxUnusedVar(pageHeightMM);
 758
 759     int leftMargin = 10;
 760     int topMargin = 10;
 761     int rightMargin = 10;
 762
 763     float leftMarginLogical = (float)(mmToLogical*leftMargin);
 764     float topMarginLogical = (float)(mmToLogical*topMargin);
 765     float rightMarginLogical = (float)(mmToLogical*(pageWidthMM - rightMargin));
 766
 767     wxCoord xExtent, yExtent;
 768     dc->GetTextExtent(text, &xExtent, &yExtent);
 769
 770     float xPos = (float)(((((pageWidthMM - leftMargin - rightMargin)/2.0)+leftMargin)*mmToLogical) - (xExtent/2.0));
 771     dc->DrawText(text, (long)xPos, (long)topMarginLogical);
 772
 773     dc->SetPen(* wxBLACK_PEN);
 774     dc->DrawLine( (long)leftMarginLogical, (long)(topMarginLogical+yExtent),
 775                   (long)rightMarginLogical, (long)topMarginLogical+yExtent );
 776
 777     return true;
 778 }