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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| -
| Header File
| wingdi.h
| Unicode
| WinNT
| Platform Notes
| None
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NEWTEXTMETRIC
The NEWTEXTMETRIC structure contains data that describes a physical font.
typedef struct tagNEWTEXTMETRIC { // ntm
LONG tmHeight;
LONG tmAscent;
LONG tmDescent;
LONG tmInternalLeading;
LONG tmExternalLeading;
LONG tmAveCharWidth;
LONG tmMaxCharWidth;
LONG tmWeight;
LONG tmOverhang;
LONG tmDigitizedAspectX;
LONG tmDigitizedAspectY;
BCHAR tmFirstChar;
BCHAR tmLastChar;
BCHAR tmDefaultChar;
BCHAR tmBreakChar;
BYTE tmItalic;
BYTE tmUnderlined;
BYTE tmStruckOut;
BYTE tmPitchAndFamily;
BYTE tmCharSet;
DWORD ntmFlags;
UINT ntmSizeEM;
UINT ntmCellHeight;
UINT ntmAvgWidth;
} NEWTEXTMETRIC;
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 tmHeight member. 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. Since 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 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 tmOverhang member enables the application to determine how much of the character width
returned by a GetTextExtentPoint32 function 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 tmDigitizedAspectX and tmDigitizedAspectY members 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 that are
not in the font.
tmBreakChar
Specifies the value of the character to 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 the pitch and family of the selected font. The low-order bit (bit 0)
specifies the pitch of the font. If it is 1, the font is variable pitch (or
proportional). If it is 0, the font is fixed pitch (or monospace). Bits 1 and 2
specify the font type. If both bits are 0, the font is a raster font; if bit 1
is 1 and bit 2 is 0, the font is a vector font; if bit 1 is 0 and bit 2 is set,
or if both bits are 1, the font is some other type. Bit 3 is 1 if the font is a
device font; otherwise, it is 0.
The four high-order bits designate the font family. The tmPitchAndFamily member can be combined with the hexadecimal value 0xF0 by using the bitwise
AND operator and can then be compared with the font family names for an
identical match. For more information about the font families, see the LOGFONT structure.
tmCharSet
Specifies the character set of the font.
ntmFlags
Specifies whether the font is italic, underscored, outlined, bold, and so
forth. The following list shows the bits corresponding to each font type:
Bit
| Meaning
| 0
| Italic
| -
| Underscore
| -
| Negative
| -
| Outline
| -
| Strikeout
| -
| Bold
|
ntmSizeEM
Specifies the size of the em square for the font. This value is in "notional
units" (that is, the units for which the font was designed).
ntmCellHeight
Specifies the height, in notional units, of the font. This value should be
compared with the value of the ntmSizeEM member.
ntmAvgWidth
Specifies the average width of characters in the font, in notional units. This
value should be compared with the value of the ntmSizeEM member.
Remarks
The last four members of the NEWTEXTMETRIC structure are not included in the TEXTMETRIC structure; in all other respects, the structures are identical.
The sizes in the NEWTEXTMETRIC structure are typically given in logical units; that is, they depend on the
current mapping mode of the display context.
See Also
EnumFontFamilies, GetTextExtentPoint32, GetTextMetrics, LOGFONT
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