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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2979 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/htmlprn.tex

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+\membersection{Printing}\label{printing}
+
+The wxHTML library provides printing facilities. 
+
+You can redirect output displayed by \helpref{wxHtmlWindow}{wxhtmlwindow}
+to the printer DC using this (or similar) code (see {\bf printing} sample for
+more details) :
+
+\begin{verbatim}
+//
+//  This method prints page number one to dc:
+//
+
+void MyPrintout::DrawPageOne(wxDC *dc)
+{
+  int leftMargin = 20;
+  int topMargin = 50;
+         // You must compute the margins there. 
+	 // Caution! These values are NOT in printer DC's units.
+	 // These values are in screen pixels.
+	 // (see bellow)
+
+  // Here we obtain internal cell representation of HTML document:
+  // (html is our pointer to wxHtmlWindow object)
+  wxHtmlContainerCell *cell = html -> GetInternalRepresentation();
+
+  // 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);                        // DC size
+  GetPageSizePixels(&pageWidth, &pageHeight); // real size
+
+  // Now we must scale it. This equation will map wxHtmlWindow
+  // to page in this way:
+  // |--this is whole page as printed---------|
+  // |        |                      |        |
+  // |        |                      |        |
+  // |-margin-|-----wxHtmlWindow-----|-margin-|
+  //
+  // So page width is 2*leftMargin + [wxHtmlWindow size]
+  // (measured in screen pixels).
+  // We will scale the printer DC so that wxHtmlWindow's content
+  // spreads from left to right:
+  float scale = (float)(
+                  (float)(pageWidth) /
+                  (float)(2 * leftMargin + cell -> GetMaxLineWidth()));
+
+  // 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);
+
+  // Set the user scale so that our computations take effect:
+  dc->SetUserScale(overallScale, overallScale);
+  dc->SetBackgroundMode(wxTRANSPARENT);
+
+  // And this is - finally - HTML stuff:
+  cell -> Draw(*dc, leftMargin, topMargin, 0, cell -> GetHeight());
+}
+\end{verbatim}
+
+(Thanks to Julian Smart for sample)