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formatted text?

Started by MB Mar 21, 2003 at 3:17 AM 3 replies 300+ views

Original Post

Mar 21, 2003 at 3:17 AM

I am wondering if it is possible to extend the CD3DFont class - so that it displays formatted text. If not - what alternative is there?

niyaw

Mar 21, 2003 at 8:16 AM

yes.

alternative is preformatting text.

Mar 21, 2003 at 9:52 AM

sorry for asking stupid questions:
But how would you preformat text?

niyaw

Mar 21, 2003 at 8:16 PM

CString text;
text.Format("%s is equal to %d", variable, value);
pfont->DrawText(text);

or you can use snprintf.

dorix

Mar 21, 2003 at 11:15 PM

Add this function to the CD3DFont class (or derive your own class from CD3DFont, and add this to the new class), and make sure that the #include directives are in the source file:

  
#include <stdarg.h>

#include <tchar.h>

#include <stdio.h>

HRESULT CD3DFont::DrawTextF(FLOAT x, FLOAT y, DWORD dwColor, TCHAR* strText, DWORD dwFlags, ...)
{
  TCHAR buf[1024];
  va_list marker;
  va_start(marker, dwFlags);
  _vsntprintf(buf, 1023, strText, marker);
  va_end(marker);

  return DrawText(x, y, dwColor, buf, dwFlags);
)

Notes:

The dwFlags argument is no longer optional.
The stdarg.h header is required for the va_* macros. The tchar.h header is required for the _vsntprintf macro. The stdio.h header is required for _vsnprintf and _vsnwprintf, which are what _vsntprintf expands to, depending on whether you're building a Unicode application or not.
Change the 1024 and 1023 to change the maximum length of the completely formatted string. Note that it is *very* difficult to know beforehand how large the formatted string will be, so it's easiest to just pick a size you can reasonably expect to be large enough.
A formatting version of the DrawTextScaled function will be left as an exercise to the reader, but it will look very similar to the DrawTextF function above.

- dorix

[edited by - dorix on March 21, 2003 12:16:53 AM]

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