22d6efa851
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3296 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
64 lines
2.1 KiB
TeX
64 lines
2.1 KiB
TeX
\membersection{Printing}\label{printing}
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The wxHTML library provides printing facilities.
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You can redirect output displayed by \helpref{wxHtmlWindow}{wxhtmlwindow}
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to the printer DC using this (or similar) code (see {\bf printing} sample for
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more details) :
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\begin{verbatim}
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//
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// This method prints page number one to dc:
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//
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void MyPrintout::DrawPageOne(wxDC *dc)
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{
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int leftMargin = 20;
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int topMargin = 50;
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// You must compute the margins there.
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// Caution! These values are NOT in printer DC's units.
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// These values are in screen pixels.
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// (see bellow)
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// Here we obtain internal cell representation of HTML document:
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// (html is our pointer to wxHtmlWindow object)
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wxHtmlContainerCell *cell = html -> GetInternalRepresentation();
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// Now we have to check in case our real page size is reduced
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// (e.g. because we're drawing to a print preview memory DC)
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int pageWidth, pageHeight;
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int w, h;
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dc->GetSize(&w, &h); // DC size
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GetPageSizePixels(&pageWidth, &pageHeight); // real size
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// Now we must scale it. This equation will map wxHtmlWindow
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// to page in this way:
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// |--this is whole page as printed---------|
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// | | | |
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// | | | |
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// |-margin-|-----wxHtmlWindow-----|-margin-|
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//
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// So page width is 2*leftMargin + [wxHtmlWindow size]
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// (measured in screen pixels).
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// We will scale the printer DC so that wxHtmlWindow's content
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// spreads from left to right:
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float scale = (float)(
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(float)(pageWidth) /
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(float)(2 * leftMargin + cell -> GetMaxLineWidth()));
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// If printer pageWidth == current DC width, then this doesn't
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// change. But w might be the preview bitmap width, so scale down.
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float overallScale = scale * (float)(w/(float)pageWidth);
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// Set the user scale so that our computations take effect:
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dc->SetUserScale(overallScale, overallScale);
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dc->SetBackgroundMode(wxTRANSPARENT);
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// And this is - finally - HTML stuff:
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cell -> Draw(*dc, leftMargin, topMargin, 0, cell -> GetHeight());
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}
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\end{verbatim}
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(Thanks to Julian Smart for sample)
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