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