63 lines
2.1 KiB
TeX
63 lines
2.1 KiB
TeX
|
\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)
|