Re: [wxMSW 2.8.4] Printing image with alpha channel (demo included)

[Steven Van Ingelgem]

Hi Chris,


I think your problem will a better chance of getting solved if you just send a diff and also add the version of the compiler, the version of wxWidgets and your OS version.

Because I have similar problems, I did this for you:
wx/SVN
win2k/4
vs2k3/1

Print preview is OK, printing is not...

Attached file is against printing sample.


Greetz,
Steven

On 7/24/07, Chris Borgolte <c...@delta-h.de> wrote:

I have problems with printing alpha channeled images under windows.
Linux (wxGTK) works.
The images are created from given data via *wxImage*(*int*/ width/,
*int*/ height/, *unsigned char**/ data/, *bool*/ static_data = false/)
constructor.
Afterward an alpha channel is added via *SetAlpha*(*unsigned char
**/alpha = NULL/,*bool*/ static_data = false/) method.

In the preview everything looks fine but the printout contains a black
rectangle where one would expect a red line.

Attached you find a modified printing sample. Notice that all changes
are resident in the MyFrame constructor.

Am I doing something wrong or is this a bug. I noticed when saving the
image as png, not every program could display it right, maybe this is a
hint.

TIA
Chris

---8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<--

/////////////////////////////////////////////////////////////////////////////
// Name: samples/printing.cpp
// Purpose: Printing demo for wxWidgets
// Author: Julian Smart
// Modified by:
// Created: 1995
// RCS-ID: $Id: printing.cpp,v 1.49 2006/11/17 01:50:59 VZ Exp $
// Copyright: (c) Julian Smart
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#if !wxUSE_PRINTING_ARCHITECTURE
#error "You must set wxUSE_PRINTING_ARCHITECTURE to 1 in setup.h, and
recompile the library."
#endif

// Set this to 1 if you want to test PostScript printing under MSW.
// However, you'll also need to edit src/msw/makefile.nt.
#define wxTEST_POSTSCRIPT_IN_MSW 0

#include <ctype.h>
#include "wx/metafile.h"
#include "wx/print.h"
#include "wx/printdlg.h"
#include "wx/image.h"
#include "wx/accel.h"

#if wxTEST_POSTSCRIPT_IN_MSW
#include "wx/generic/printps.h"
#include "wx/generic/prntdlgg.h"
#endif

#ifdef __WXMAC__
#include "wx/mac/printdlg.h"
#endif

#include " printing.h"

#ifndef __WXMSW__
#include "mondrian.xpm"
#endif

#if wxUSE_LIBGNOMEPRINT
#include "wx/html/forcelnk.h"
FORCE_LINK(gnome_print)
#endif


// Declare a frame
MyFrame *frame = (MyFrame *) NULL;
// int orientation = wxPORTRAIT;

// Global print data, to remember settings during the session
wxPrintData *g_printData = (wxPrintData*) NULL ;

// Global page setup data
wxPageSetupDialogData* g_pageSetupData = (wxPageSetupDialogData*) NULL;

// Main proc
IMPLEMENT_APP(MyApp)

// Writes a header on a page. Margin units are in millimetres.
bool WritePageHeader(wxPrintout *printout, wxDC *dc, const wxChar *text,
float mmToLogical);

// The `main program' equivalent, creating the windows and returning the
// main frame

bool MyApp::OnInit(void)
{
wxInitAllImageHandlers();

m_testFont.Create(10, wxSWISS, wxNORMAL, wxNORMAL);

g_printData = new wxPrintData;
// You could set an initial paper size here
// g_printData->SetPaperId(wxPAPER_LETTER); // for Americans
// g_printData->SetPaperId(wxPAPER_A4); // for everyone else

g_pageSetupData = new wxPageSetupDialogData;
// copy over initial paper size from print record
(*g_pageSetupData) = *g_printData;
// Set some initial page margins in mm.
g_pageSetupData->SetMarginTopLeft(wxPoint(15, 15));
g_pageSetupData->SetMarginBottomRight(wxPoint(15, 15));

// Create the main frame window
frame = new MyFrame((wxFrame *) NULL, _T("wxWidgets Printing Demo"),
wxPoint(0, 0), wxSize(400, 400));

#if wxUSE_STATUSBAR
// Give it a status line
frame->CreateStatusBar(2);
#endif // wxUSE_STATUSBAR

// Load icon and bitmap
frame->SetIcon( wxICON( mondrian) );

// Make a menubar
wxMenu *file_menu = new wxMenu;

file_menu->Append(WXPRINT_PRINT, _T("&Print..."), _T("Print"));
file_menu->Append(WXPRINT_PAGE_SETUP, _T("Page Set&up..."), _T("Page
setup"));
#ifdef __WXMAC__
file_menu->Append(WXPRINT_PAGE_MARGINS, _T("Page Margins..."), _T("Page
margins"));
#endif
file_menu->Append(WXPRINT_PREVIEW, _T("Print Pre&view"), _T("Preview"));

#if wxUSE_ACCEL
// Accelerators
wxAcceleratorEntry entries[1];
entries[0].Set(wxACCEL_CTRL, (int) 'V', WXPRINT_PREVIEW);
wxAcceleratorTable accel(1, entries);
frame->SetAcceleratorTable(accel);
#endif

#if defined(__WXMSW__) && wxTEST_POSTSCRIPT_IN_MSW
file_menu->AppendSeparator();
file_menu->Append(WXPRINT_PRINT_PS, _T("Print PostScript..."), _T("Print
(PostScript)"));
file_menu->Append(WXPRINT_PAGE_SETUP_PS, _T("Page Setup PostScript..."),
_T("Page setup (PostScript)"));
file_menu->Append(WXPRINT_PREVIEW_PS, _T("Print Preview PostScript"),
_T("Preview (PostScript)"));
#endif

file_menu->AppendSeparator();
file_menu->Append(WXPRINT_ANGLEUP, _T("Angle up\tAlt-U"), _T("Raise
rotated text angle"));
file_menu->Append(WXPRINT_ANGLEDOWN, _T("Angle down\tAlt-D"), _T("Lower
rotated text angle"));
file_menu->AppendSeparator();
file_menu->Append(WXPRINT_QUIT, _T("E&xit"), _T("Exit program"));

wxMenu *help_menu = new wxMenu;
help_menu->Append(WXPRINT_ABOUT, _T("&About"), _T("About this demo"));

wxMenuBar *menu_bar = new wxMenuBar;

menu_bar->Append(file_menu, _T("&File"));
menu_bar->Append(help_menu, _T("&Help"));

// Associate the menu bar with the frame
frame->SetMenuBar(menu_bar);

MyCanvas *canvas = new MyCanvas(frame, wxPoint(0, 0), wxSize(100, 100),
wxRETAINED|wxHSCROLL|wxVSCROLL);

// Give it scrollbars: the virtual canvas is 20 * 50 = 1000 pixels in
each direction
canvas->SetScrollbars(20, 20, 50, 50);

frame->canvas = canvas;

frame->Centre(wxBOTH);
frame->Show();

#if wxUSE_STATUSBAR
frame->SetStatusText(_T("Printing demo"));
#endif // wxUSE_STATUSBAR

SetTopWindow(frame);

return true;
}

int MyApp::OnExit()
{
delete g_printData;
delete g_pageSetupData;
return 1;
}

BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(WXPRINT_QUIT, MyFrame::OnExit)
EVT_MENU(WXPRINT_PRINT, MyFrame::OnPrint)
EVT_MENU(WXPRINT_PREVIEW, MyFrame::OnPrintPreview)
EVT_MENU(WXPRINT_PAGE_SETUP, MyFrame::OnPageSetup)
EVT_MENU(WXPRINT_ABOUT, MyFrame::OnPrintAbout)
#if defined(__WXMSW__) && wxTEST_POSTSCRIPT_IN_MSW
EVT_MENU(WXPRINT_PRINT_PS, MyFrame::OnPrintPS)
EVT_MENU(WXPRINT_PREVIEW_PS, MyFrame::OnPrintPreviewPS)
EVT_MENU(WXPRINT_PAGE_SETUP_PS, MyFrame::OnPageSetupPS)
#endif
#ifdef __WXMAC__
EVT_MENU(WXPRINT_PAGE_MARGINS, MyFrame::OnPageMargins)
#endif
EVT_MENU(WXPRINT_ANGLEUP, MyFrame::OnAngleUp)
EVT_MENU(WXPRINT_ANGLEDOWN, MyFrame::OnAngleDown)
END_EVENT_TABLE()

// Define my frame constructor
MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint&
pos, const wxSize& size):
wxFrame(frame, wxID_ANY, title, pos, size)
{
canvas = NULL;
m_angle = 30;


//Create an (transparent) image with a diagonal line
typedef unsigned char UC;
const int sx = 100;
const int sy = 100;

size_t sz=sx*sy;
UC* alpha = static_cast<UC*>( calloc(sz, sizeof(UC)) );
sz *= 3;
UC* data = static_cast<UC*>( calloc(sz, sizeof(UC)) );

int i,j;
for (j = 0; j < sy; ++j){
for (i = 0; i < sx; ++i){
if ( i > j-2 && i < j + 2 ) {
alpha[i+j*sx] = 255;
UC* p = &data[i*3 + j*sx*3];
*p++ = 255;
*p++ = 0;
*p = 0;
}
}
}

wxImage image(sx,sy, data);
image.SetAlpha(alpha);
m_bitmap = wxBitmap(image);
}

void MyFrame::OnExit(wxCommandEvent& WXUNUSED(event))
{
Close(true /*force closing*/);
}

void MyFrame::OnPrint(wxCommandEvent& WXUNUSED(event))
{
wxPrintDialogData printDialogData(* g_printData);

wxPrinter printer(& printDialogData);
MyPrintout printout(_T("My printout"));
if (!printer.Print(this, &printout, true /*prompt*/))
{
if (wxPrinter::GetLastError() == wxPRINTER_ERROR)
wxMessageBox(_T("There was a problem printing.\nPerhaps your current
printer is not set correctly?"), _T("Printing"), wxOK);
else
wxMessageBox(_T("You canceled printing"), _T("Printing"), wxOK);
}
else
{
(*g_printData) = printer.GetPrintDialogData ().GetPrintData();
}
}

void MyFrame::OnPrintPreview(wxCommandEvent& WXUNUSED(event))
{
// Pass two printout objects: for preview, and possible printing.
wxPrintDialogData printDialogData(* g_printData);
wxPrintPreview *preview = new wxPrintPreview(new MyPrintout, new
MyPrintout, & printDialogData);
if (!preview->Ok())
{
delete preview;
wxMessageBox(_T("There was a problem previewing.\nPerhaps your current
printer is not set correctly?"), _T("Previewing"), wxOK);
return;
}

wxPreviewFrame *frame = new wxPreviewFrame(preview, this, _T("Demo Print
Preview"), wxPoint(100, 100), wxSize(600, 650));
frame->Centre(wxBOTH);
frame->Initialize();
frame->Show();
}

void MyFrame::OnPageSetup(wxCommandEvent& WXUNUSED(event))
{
(*g_pageSetupData) = *g_printData;

wxPageSetupDialog pageSetupDialog(this, g_pageSetupData);
pageSetupDialog.ShowModal();

(*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
(*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
}

#if defined(__WXMSW__) && wxTEST_POSTSCRIPT_IN_MSW
void MyFrame::OnPrintPS(wxCommandEvent& WXUNUSED(event))
{
wxPostScriptPrinter printer(g_printData);
MyPrintout printout(_T("My printout"));
printer.Print(this, &printout, true/*prompt*/);

(*g_printData) = printer.GetPrintData();
}

void MyFrame::OnPrintPreviewPS(wxCommandEvent& WXUNUSED(event))
{
// Pass two printout objects: for preview, and possible printing.
wxPrintDialogData printDialogData(* g_printData);
wxPrintPreview *preview = new wxPrintPreview(new MyPrintout, new
MyPrintout, & printDialogData);
wxPreviewFrame *frame = new wxPreviewFrame(preview, this, _T("Demo Print
Preview"), wxPoint(100, 100), wxSize(600, 650));
frame->Centre(wxBOTH);
frame->Initialize();
frame->Show();
}

void MyFrame::OnPageSetupPS(wxCommandEvent& WXUNUSED(event))
{
(*g_pageSetupData) = * g_printData;

wxGenericPageSetupDialog pageSetupDialog(this, g_pageSetupData);
pageSetupDialog.ShowModal();

(*g_printData) = pageSetupDialog.GetPageSetupDialogData().GetPrintData();
(*g_pageSetupData) = pageSetupDialog.GetPageSetupDialogData();
}
#endif


#ifdef __WXMAC__
void MyFrame::OnPageMargins(wxCommandEvent& WXUNUSED(event))
{
(*g_pageSetupData) = *g_printData;

wxMacPageMarginsDialog pageMarginsDialog(this, g_pageSetupData);
pageMarginsDialog.ShowModal();

(*g_printData) = pageMarginsDialog.GetPageSetupDialogData().GetPrintData();
(*g_pageSetupData) = pageMarginsDialog.GetPageSetupDialogData();
}
#endif


void MyFrame::OnPrintAbout(wxCommandEvent& WXUNUSED(event))
{
(void)wxMessageBox(_T("wxWidgets printing demo\nAuthor: Julian Smart"),
_T("About wxWidgets printing demo"), wxOK|wxCENTRE);
}

void MyFrame::OnAngleUp(wxCommandEvent& WXUNUSED(event))
{
m_angle += 5;
canvas->Refresh();
}

void MyFrame::OnAngleDown(wxCommandEvent& WXUNUSED(event))
{
m_angle -= 5;
canvas->Refresh();
}

void MyFrame::Draw(wxDC& dc)
{
// This routine just draws a bunch of random stuff on the screen so that we
// can check that different types of object are being drawn consistently
// between the screen image, the print preview image (at various zoom
// levels), and the printed page.
dc.SetBackground(*wxWHITE_BRUSH);
dc.Clear();
dc.SetFont(wxGetApp().m_testFont);

dc.SetBackgroundMode(wxTRANSPARENT);

dc.SetPen(*wxBLACK_PEN);
dc.SetBrush(*wxLIGHT_GREY_BRUSH);
dc.DrawRectangle(0, 0, 230, 350);
dc.DrawLine(0, 0, 229, 349);
dc.DrawLine(229, 0, 0, 349);
dc.SetBrush(*wxTRANSPARENT_BRUSH);

dc.SetBrush(*wxCYAN_BRUSH);
dc.SetPen(*wxRED_PEN);

dc.DrawRoundedRectangle (0, 20, 200, 80, 20);

dc.DrawText( wxT("Rectangle 200 by 80"), 40, 40);

dc.SetPen( wxPen(*wxBLACK,0,wxDOT_DASH) );
dc.DrawEllipse(50, 140, 100, 50);
dc.SetPen(*wxRED_PEN);

dc.DrawText( wxT("Test message: this is in 10 point text"), 10, 180);

#if wxUSE_UNICODE
char *test = "Hebrew שלונ -- Japanese (日本語)";
wxString tmp = wxConvUTF8.cMB2WC( test );
dc.DrawText( tmp, 10, 200 );
#endif

wxPoint points[5];
points[0].x = 0;
points[0].y = 0;
points[1].x = 20;
points[1].y = 0;
points[2].x = 20;
points[2].y = 20;
points[3].x = 10;
points[3].y = 20;
points[4].x = 10;
points[4].y = -20;
dc.DrawPolygon( 5, points, 20, 250, wxODDEVEN_RULE );
dc.DrawPolygon( 5, points, 50, 250, wxWINDING_RULE );

dc.DrawEllipticArc( 80, 250, 60, 30, 0.0, 270.0 );

points[0].x = 150;
points[0].y = 250;
points[1].x = 180;
points[1].y = 250;
points[2].x = 180;
points[2].y = 220;
points[3].x = 200;
points[3].y = 220;
dc.DrawSpline( 4, points );

dc.DrawArc( 20,10, 10,10, 25,40 );

wxString str;
int i = 0;
str.Printf( wxT("---- Text at angle %d ----"), i );
dc.DrawRotatedText( str, 100, 300, i );

i = m_angle;
str.Printf( wxT("---- Text at angle %d ----"), i );
dc.DrawRotatedText( str, 100, 300, i );

wxIcon my_icon = wxICON(mondrian) ;

dc.DrawIcon( my_icon, 100, 100);

if (m_bitmap.Ok())
dc.DrawBitmap( m_bitmap, 10, 10 );
}

void MyFrame::OnSize(wxSizeEvent& event )
{
wxFrame::OnSize(event);
}

BEGIN_EVENT_TABLE(MyCanvas, wxScrolledWindow)
EVT_MOUSE_EVENTS(MyCanvas::OnEvent)
END_EVENT_TABLE()

MyCanvas::MyCanvas(wxFrame *frame, const wxPoint& pos, const wxSize&
size, long style):
wxScrolledWindow(frame, wxID_ANY, pos, size, style)
{
SetBackgroundColour(* wxWHITE);
}

void MyCanvas::OnDraw(wxDC& dc)
{
frame->Draw(dc);
}

void MyCanvas::OnEvent(wxMouseEvent& WXUNUSED(event))
{
}

bool MyPrintout::OnPrintPage(int page)
{
wxDC *dc = GetDC();
if (dc)
{
if (page == 1)
DrawPageOne();
else if (page == 2)
DrawPageTwo();

// Draw page numbers at top left corner of printable area, sized so that
// screen size of text matches paper size.
MapScreenSizeToPage();
wxChar buf[200];
wxSprintf(buf, wxT("PAGE %d"), page);
dc->DrawText(buf, 0, 0);

return true;
}
else
return false;
}

bool MyPrintout::OnBeginDocument(int startPage, int endPage)
{
if (!wxPrintout::OnBeginDocument(startPage, endPage))
return false;

return true;
}

void MyPrintout::GetPageInfo(int *minPage, int *maxPage, int
*selPageFrom, int *selPageTo)
{
*minPage = 1;
*maxPage = 2;
*selPageFrom = 1;
*selPageTo = 2;
}

bool MyPrintout::HasPage(int pageNum)
{
return (pageNum == 1 || pageNum == 2);
}

void MyPrintout::DrawPageOne()
{
// You might use THIS code if you were scaling graphics of known size to fit
// on the page. The commented-out code illustrates different ways of scaling
// the graphics.

// We know the graphic is 230x350. If we didn't know this, we'd need to
// calculate it.
wxCoord maxX = 230;
wxCoord maxY = 350;

// This sets the user scale and origin of the DC so that the image fits
// within the paper rectangle (but the edges could be cut off by printers
// that can't print to the edges of the paper -- which is most of them. Use
// this if your image already has its own margins.
// FitThisSizeToPaper(wxSize(maxX, maxY));
// wxRect fitRect = GetLogicalPaperRect();

// This sets the user scale and origin of the DC so that the image fits
// within the page rectangle, which is the printable area on Mac and MSW
// and is the entire page on other platforms.
// FitThisSizeToPage(wxSize(maxX, maxY));
// wxRect fitRect = GetLogicalPageRect();

// This sets the user scale and origin of the DC so that the image fits
// within the page margins as specified by g_PageSetupData, which you can
// change (on some platforms, at least) in the Page Setup dialog. Note that
// on Mac, the native Page Setup dialog doesn't let you change the margins
// of a wxPageSetupDialogData object, so you'll have to write your own
dialog or
// use the Mac-only wxMacPageMarginsDialog, as we do in this program.
FitThisSizeToPageMargins(wxSize(maxX, maxY), *g_pageSetupData);
wxRect fitRect = GetLogicalPageMarginsRect(*g_pageSetupData);

// This sets the user scale and origin of the DC so that the image appears
// on the paper at the same size that it appears on screen ( i.e., 10-point
// type on screen is 10-point on the printed page) and is positioned in the
// top left corner of the page rectangle (just as the screen image appears
// in the top left corner of the window).
// MapScreenSizeToPage();
// wxRect fitRect = GetLogicalPageRect();

// You could also map the screen image to the entire paper at the same size
// as it appears on screen.
// MapScreenSizeToPaper();
// wxRect fitRect = GetLogicalPaperRect();

// You might also wish to do you own scaling in order to draw objects at
// full native device resolution. In this case, you should do the following.
// Note that you can use the GetLogicalXXXRect() commands to obtain the
// appropriate rect to scale to.
// MapScreenSizeToDevice();
// wxRect fitRect = GetLogicalPageRect();

// Each of the preceding Fit or Map routines positions the origin so that
// the drawn image is positioned at the top left corner of the reference
// rectangle. You can easily center or right- or bottom-justify the image as
// follows.

// This offsets the image so that it is centered within the reference
// rectangle defined above.
wxCoord xoff = ( fitRect.width - maxX) / 2;
wxCoord yoff = (fitRect.height - maxY) / 2;
OffsetLogicalOrigin(xoff, yoff);

// This offsets the image so that it is positioned at the bottom right of
// the reference rectangle defined above.
// wxCoord xoff = (fitRect.width - maxX);
// wxCoord yoff = (fitRect.height - maxY);
// OffsetLogicalOrigin(xoff, yoff);

frame->Draw(*GetDC());
}

void MyPrintout::DrawPageTwo()
{
// You might use THIS code to set the printer DC to ROUGHLY reflect
// the screen text size. This page also draws lines of actual length
// 5cm on the page.

// Compare this to DrawPageOne(), which uses the really convenient routines
// from wxPrintout to fit the screen image onto the printed page. This page
// illustrates how to do all the scaling calculations yourself, if you're so
// inclined.

wxDC *dc = GetDC();

// Get the logical pixels per inch of screen and printer
int ppiScreenX, ppiScreenY;
GetPPIScreen(&ppiScreenX, &ppiScreenY);
int ppiPrinterX, ppiPrinterY;
GetPPIPrinter(&ppiPrinterX, &ppiPrinterY);

// This scales the DC so that the printout roughly represents the the screen
// scaling. The text point size _should_ be the right size but in fact is
// too small for some reason. This is a detail that will need to be
// addressed at some point but can be fudged for the moment.
float scale = (float)((float)ppiPrinterX/(float)ppiScreenX);

// Now we have to check in case our real page size is reduced (e.g. because
// we're drawing to a print preview memory DC)
int pageWidth, pageHeight;
int w, h;
dc->GetSize(&w, &h);
GetPageSizePixels(&pageWidth, &pageHeight);

// If printer pageWidth == current DC width, then this doesn't change. But w
// might be the preview bitmap width, so scale down.
float overallScale = scale * (float)(w/(float)pageWidth);
dc->SetUserScale(overallScale, overallScale);

// Calculate conversion factor for converting millimetres into logical
// units. There are approx. 25.4 mm to the inch. There are ppi device units
// to the inch. Therefore 1 mm corresponds to ppi/25.4 device units. We also
// divide by the screen-to-printer scaling factor, because we need to
// unscale to pass logical units to DrawLine.

// Draw 50 mm by 50 mm L shape
float logUnitsFactor = (float)(ppiPrinterX/(scale*25.4));
float logUnits = (float)(50*logUnitsFactor);
dc->SetPen(* wxBLACK_PEN);
dc->DrawLine(50, 250, (long)(50.0 + logUnits), 250);
dc->DrawLine(50, 250, 50, (long)(250.0 + logUnits));

dc->SetBackgroundMode(wxTRANSPARENT);
dc->SetBrush(*wxTRANSPARENT_BRUSH);

{ // GetTextExtent demo:
wxString words[7] = {_T("This "), _T("is "), _T("GetTextExtent "),
_T("testing "), _T("string. "), _T("Enjoy "), _T("it!")};
long w, h;
long x = 200, y= 250;
wxFont fnt(15, wxSWISS, wxNORMAL, wxNORMAL);

dc->SetFont(fnt);

for (int i = 0; i < 7; i++)
{
wxString word = words[i];
word.Remove( word.Len()-1, 1 );
dc->GetTextExtent(word, &w, &h);
dc->DrawRectangle(x, y, w, h);
dc->GetTextExtent(words[i], &w, &h);
dc->DrawText(words[i], x, y);
x += w;
}

}

dc->SetFont(wxGetApp().m_testFont);

dc->DrawText(_T("Some test text"), 200, 300 );

// TESTING

int leftMargin = 20;
int rightMargin = 20;
int topMargin = 20;
int bottomMargin = 20;

int pageWidthMM, pageHeightMM;
GetPageSizeMM(&pageWidthMM, &pageHeightMM);

float leftMarginLogical = (float)(logUnitsFactor*leftMargin);
float topMarginLogical = (float)(logUnitsFactor*topMargin);
float bottomMarginLogical = (float)(logUnitsFactor*(pageHeightMM -
bottomMargin));
float rightMarginLogical = (float)(logUnitsFactor*(pageWidthMM -
rightMargin));

dc->SetPen(* wxRED_PEN);
dc->DrawLine( (long)leftMarginLogical, (long)topMarginLogical,
(long)rightMarginLogical, (long)topMarginLogical);
dc->DrawLine( (long)leftMarginLogical, (long)bottomMarginLogical,
(long)rightMarginLogical, (long)bottomMarginLogical);

WritePageHeader(this, dc, _T("A header"), logUnitsFactor);
}

// Writes a header on a page. Margin units are in millimetres.
bool WritePageHeader(wxPrintout *printout, wxDC *dc, const wxChar *text,
float mmToLogical)
{
/*
static wxFont *headerFont = (wxFont *) NULL;
if (!headerFont)
{
headerFont = wxTheFontList->FindOrCreateFont(16, wxSWISS, wxNORMAL, wxBOLD);
}
dc->SetFont(headerFont);
*/

int pageWidthMM, pageHeightMM;

printout->GetPageSizeMM(&pageWidthMM, &pageHeightMM);
wxUnusedVar(pageHeightMM);

int leftMargin = 10;
int topMargin = 10;
int rightMargin = 10;

float leftMarginLogical = (float)(mmToLogical*leftMargin);
float topMarginLogical = (float)(mmToLogical*topMargin);
float rightMarginLogical = (float)(mmToLogical*(pageWidthMM - rightMargin));

long xExtent, yExtent;
dc->GetTextExtent(text, &xExtent, &yExtent);
float xPos = (float)(((((pageWidthMM - leftMargin -
rightMargin)/2.0)+leftMargin)*mmToLogical) - (xExtent/2.0));
dc->DrawText(text, (long)xPos, (long)topMarginLogical);

dc->SetPen(* wxBLACK_PEN);
dc->DrawLine( (long)leftMarginLogical, (long)(topMarginLogical+yExtent),
(long)rightMarginLogical, (long)topMarginLogical+yExtent );

return true;
}



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[Steven Van Ingelgem]

Seems I have a lot of whitespace problems too :)

Find a non-whitespaced patch in here.

dc.DrawText ( wxT("Test message: this is in 10 point text"), 10, 180);

#if wxUSE_UNICODE

char *test = "Hebrew ש×Å"ו×  -- Japanese (æâ€"¥æÅ"¬èªž)";