fontsize.cpp

来自「MiniCA V2.0版本源码。《小型CA系统V2.1含源码》发表以来」· C++ 代码 · 共 47 行

// FontSize.cpp  Version 1.0
//
// Author:  Hans Dietrich
//          [e-mail]
//
// This software is released into the public domain.
// You are free to use it in any way you like.
//
// This software is provided "as is" with no expressed
// or implied warranty.  I accept no liability for any
// damage or loss of business that this software may cause.
//
///////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "FontSize.h"

///////////////////////////////////////////////////////////////////////////////
// GetFontPointSize()
int GetFontPointSize(int nHeight)
{
	HDC hdc = ::CreateDC(_T("DISPLAY"), NULL, NULL, NULL);
	ASSERT(hdc);
	int cyPixelsPerInch = ::GetDeviceCaps(hdc, LOGPIXELSY);
	::DeleteDC(hdc);

	int nPointSize = MulDiv(nHeight, 72, cyPixelsPerInch);
	if (nPointSize < 0)
		nPointSize = -nPointSize;

	return nPointSize;
}

///////////////////////////////////////////////////////////////////////////////
// GetFontHeight()
int GetFontHeight(int nPointSize)
{
	HDC hdc = ::CreateDC(_T("DISPLAY"), NULL, NULL, NULL);
	ASSERT(hdc);
	int cyPixelsPerInch = ::GetDeviceCaps(hdc, LOGPIXELSY);
	::DeleteDC(hdc);

	int nHeight = -MulDiv(nPointSize, cyPixelsPerInch, 72);

	return nHeight;
}