TEXTMETRIC

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This structure contains basic information about a physical font.

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

Runs on	Versions	Defined in	Include	Link to
Windows CE OS	1.0 and later	Wingdi.h

Note This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.