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1 GetTextMetrics(hdc,&tm);
2 cxChar=tm.tmAveCharWidth;
3 cxCaps=(tm.tmPitchAndFamily & 1 ? 3:2)*cxChar/2;
4 cyChar=tm.tmHeight+tm.tmExternalLeading;
5 iMaxWidth=40*cxChar+22*cxCaps;
第3和5句是什么意思？
2 cxChar=tm.tmAveCharWidth;
3 cxCaps=(tm.tmPitchAndFamily & 1 ? 3:2)*cxChar/2;
4 cyChar=tm.tmHeight+tm.tmExternalLeading;
5 iMaxWidth=40*cxChar+22*cxCaps;
第3和5句是什么意思？
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心念不空过 2002-03-28
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是在说我吗？不是吧？是在说别人吧？:)
我没有QQ:(
我没有QQ:(
ffuu 2002-03-28
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牛！
这都看得出来，能把QQ号告诉我吗？以后我可以请教。---不是很过分吧？
这都看得出来，能把QQ号告诉我吗？以后我可以请教。---不是很过分吧？
心念不空过 2002-03-28
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是Programming Windows上的代码吧？
#define TMPF_FIXED_PITCH 0x01
#define TMPF_VECTOR 0x02
#define TMPF_DEVICE 0x08
#define TMPF_TRUETYPE 0x04
tmPitchAndFamily & 1是说如果字体宽度可变，则采用1.5倍于平均字符宽度，也就是的该字体的最大宽度了，如果字体宽度固定，则用平均字符宽度就可以了（实际上也是该字体的最大宽度了，）最大宽度与平均宽度的关系，参见原书。
iMaxWidth=40*cxChar+22*cxCaps;
是为了定义横行滚动条出现的条件，因为下面的WM_PAINT中就是这么TextOut的。
OK？
#define TMPF_FIXED_PITCH 0x01
#define TMPF_VECTOR 0x02
#define TMPF_DEVICE 0x08
#define TMPF_TRUETYPE 0x04
tmPitchAndFamily & 1是说如果字体宽度可变，则采用1.5倍于平均字符宽度，也就是的该字体的最大宽度了，如果字体宽度固定，则用平均字符宽度就可以了（实际上也是该字体的最大宽度了，）最大宽度与平均宽度的关系，参见原书。
iMaxWidth=40*cxChar+22*cxCaps;
是为了定义横行滚动条出现的条件，因为下面的WM_PAINT中就是这么TextOut的。
OK？
AloneWolf 2002-03-28
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3.
if(tm.tmPitchAndFamily & 1 !=0)
{
cxCaps=3*cxChar/2;
}
else cxCaps=2*cxChar/2;
tmPitchAndFamily
Specifies information about the pitch, the technology, and the family of a physical font.
The four low-order bits of this member specify information about the pitch and the technology of the font. A constant is defined for each of the four bits: Constant Meaning
TMPF_FIXED_PITCH If this bit is set the font is a variable pitch font. If this bit is clear the font is a fixed pitch font. Note very carefully that those meanings are the opposite of what the constant name implies.
TMPF_VECTOR If this bit is set the font is a vector font.
TMPF_TRUETYPE If this bit is set the font is a TrueType font.
TMPF_DEVICE If this bit is set the font is a device font.
An application should carefully test for qualities encoded in these low-order bits, making no arbitrary assumptions. For example, besides having their own bits set, TrueType and PostScript fonts set the TMPF_VECTOR bit. A monospace bitmap font has all of these low-order bits clear; a proportional bitmap font sets the TMPF_FIXED_PITCH bit. A Postscript printer device font sets the TMPF_DEVICE, TMPF_VECTOR, and TMPF_FIXED_PITCH bits.
The four high-order bits of tmPitchAndFamily designate the font's font family. An application can use the value 0xF0 and the bitwise AND operator to mask out the four low-order bits of tmPitchAndFamily, thus obtaining a value that can be directly compared with font family names to find an identical match. For information about font families, see the description of the LOGFONT structure.
if(tm.tmPitchAndFamily & 1 !=0)
{
cxCaps=3*cxChar/2;
}
else cxCaps=2*cxChar/2;
tmPitchAndFamily
Specifies information about the pitch, the technology, and the family of a physical font.
The four low-order bits of this member specify information about the pitch and the technology of the font. A constant is defined for each of the four bits: Constant Meaning
TMPF_FIXED_PITCH If this bit is set the font is a variable pitch font. If this bit is clear the font is a fixed pitch font. Note very carefully that those meanings are the opposite of what the constant name implies.
TMPF_VECTOR If this bit is set the font is a vector font.
TMPF_TRUETYPE If this bit is set the font is a TrueType font.
TMPF_DEVICE If this bit is set the font is a device font.
An application should carefully test for qualities encoded in these low-order bits, making no arbitrary assumptions. For example, besides having their own bits set, TrueType and PostScript fonts set the TMPF_VECTOR bit. A monospace bitmap font has all of these low-order bits clear; a proportional bitmap font sets the TMPF_FIXED_PITCH bit. A Postscript printer device font sets the TMPF_DEVICE, TMPF_VECTOR, and TMPF_FIXED_PITCH bits.
The four high-order bits of tmPitchAndFamily designate the font's font family. An application can use the value 0xF0 and the bitwise AND operator to mask out the four low-order bits of tmPitchAndFamily, thus obtaining a value that can be directly compared with font family names to find an identical match. For information about font families, see the description of the LOGFONT structure.
