samples/printing/printing.cpp

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