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4/8/2010

This structure contains basic information about a physical font.

Syntax 

typedef struct tagTEXTMETRIC {
  LONG 
tmHeight; 
  LONG 
tmAscent; 
  LONG 
tmDescent; 
  LONG 
tmInternalLeading; 
  LONG 
tmExternalLeading; 
  LONG 
tmAveCharWidth; 
  LONG 
tmMaxCharWidth; 
  LONG 
tmWeight; 
  LONG 
tmOverhang; 
  LONG 
tmDigitizedAspectX; 
  LONG 
tmDigitizedAspectY; 
  char 
tmFirstChar; 
  char 
tmLastChar; 
  char 
tmDefaultChar; 
  char 
tmBreakChar; 
  BYTE 
tmItalic; 
  BYTE 
tmUnderlined; 
  BYTE 
tmStruckOut; 
  BYTE 
tmPitchAndFamily; 
  BYTE 
tmCharSet; 
} TEXTMETRIC;

Members

tmHeight

Specifies the height (ascent descent) of characters.

tmAscent

Specifies the ascent (units above the base line) of characters.

tmDescent

Specifies the descent (units below the base line) of characters.

tmInternalLeading

Specifies the amount of leading (space) inside the bounds set by the tmHeightmember. Accent marks and other diacritical characters may occur in this area. The designer may set this member to zero.

tmExternalLeading

Specifies the amount of extra leading (space) that the application adds between rows. Because this area is outside the font, it contains no marks and is not altered by text output calls in either OPAQUE or TRANSPARENT mode. The designer may set this member to zero.

tmAveCharWidth

Specifies the average width of characters in the font (generally defined as the width of the letter x). This value does not include the overhang required for bold or italic characters.

tmMaxCharWidth

Specifies the width of the widest character in the font.

tmWeight

Specifies the weight of the font.

tmOverhang

Specifies the extra width per string that may be added to some synthesized fonts. When synthesizing some attributes, such as bold or italic, graphics device interface (GDI) or a device may have to add width to a string on both a per-character and per-string basis. For example, GDI makes a string bold by expanding the spacing of each character and overstriking by an offset value; it italicizes a font by shearing the string. In either case, there is an overhang past the basic string. For bold strings, the overhang is the distance by which the overstrike is offset. For italic strings, the overhang is the amount the top of the font is sheared past the bottom of the font.

The tmOverhangmember enables the application to determine how much of the character width returned by a GetTextExtentPoint32function call on a single character is the actual character width and how much is the per-string extra width. The actual width is the extent minus the overhang.

tmDigitizedAspectX

Specifies the horizontal aspect of the device for which the font was designed.

tmDigitizedAspectY

Specifies the vertical aspect of the device for which the font was designed. The ratio of the tmDigitizedAspectXand tmDigitizedAspectYmembers is the aspect ratio of the device for which the font was designed.

tmFirstChar

Specifies the value of the first character defined in the font.

tmLastChar

Specifies the value of the last character defined in the font.

tmDefaultChar

Specifies the value of the character to be substituted for characters not in the font.

tmBreakChar

Specifies the value of the character that will be used to define word breaks for text justification.

tmItalic

Specifies an italic font if it is nonzero.

tmUnderlined

Specifies an underlined font if it is nonzero.

tmStruckOut

Specifies a strikeout font if it is nonzero.

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.

Value Description

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 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 tmPitchAndFamilydesignate 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 LOGFONTstructure.

tmCharSet

Specifies the character set of the font. The character set is one of the following values:

ANSI_CHARSET

DEFAULT_CHARSET

SYMBOL_CHARSET

SHIFTJIS_CHARSET

HANGUL_CHARSET

GB2312_CHARSET

CHINESEBIG5_CHARSET

OEM_CHARSET

JOHAB_CHARSET

HEBREW_CHARSET

ARABIC_CHARSET

GREEK_CHARSET

TURKISH_CHARSET

VIETNAMESE_CHARSET

THAI_CHARSET

EASTEUROPE_CHARSET

RUSSIAN_CHARSET

MAC_CHARSET

BALTIC_CHARSET

 

Requirements

Header wingdi.h
Windows Embedded CE Windows CE 1.0 and later
Windows Mobile Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later

See Also