org.axsl.fontR
Interface Font

All Superinterfaces:

java.lang.Comparable

public interface Font

extends java.lang.Comparable

The Font interface exposes a font resource to the client application.

Field Summary

static byte	FONT_COMPLEXITY_UNKNOWN Font-complexity constant indicating that the complexity is not known.
static byte	FONT_COMPOSITE Font-complexity constant indicating that the font is a composite font.
static byte	FONT_SELECTION_AUTO font-selection-strategy constant indicating "auto".
static byte	FONT_SELECTION_CBC font-selection-strategy constant indicating "character-by-character".
static byte	FONT_SIMPLE Font-complexity constant indicating that the font is a simple font.
static byte	FONT_STRETCH_ANY Font-stretch constant indicating no preference.
static byte	FONT_STRETCH_CONDENSED Font-stretch constant indicating condensed.
static byte	FONT_STRETCH_EXPANDED Font-stretch constant indicating expanded.
static byte	FONT_STRETCH_EXTRA_CONDENSED Font-stretch constant indicating extra-condensed.
static byte	FONT_STRETCH_EXTRA_EXPANDED Font-stretch constant indicating extra-expanded.
static byte	FONT_STRETCH_NORMAL Font-stretch constant indicating normal.
static byte	FONT_STRETCH_SEMI_CONDENSED Font-stretch constant indicating semi-condensed.
static byte	FONT_STRETCH_SEMI_EXPANDED Font-stretch constant indicating semi-expanded.
static byte	FONT_STRETCH_ULTRA_CONDENSED Font-stretch constant indicating ultra-condensed.
static byte	FONT_STRETCH_ULTRA_EXPANDED Font-stretch constant indicating ultra-expanded.
static byte	FONT_STYLE_ANY Font-style constant indicating no preference.
static byte	FONT_STYLE_BACKSLANT Font-style constant indicating a backslant typeface.
static byte	FONT_STYLE_ITALIC Font-style constant indicating an italic typeface.
static byte	FONT_STYLE_NORMAL Font-style constant indicating an upright (Roman) typeface.
static byte	FONT_STYLE_OBLIQUE Font-style constant indicating an oblique typeface.
static byte	FONT_VARIANT_ANY Font-variant constant indicating no preference.
static byte	FONT_VARIANT_NORMAL Font-variant constant indicating that small-caps is not on.
static byte	FONT_VARIANT_SMALL_CAPS Font-variant constant indicating that small-caps is on.
static short	FONT_WEIGHT_100 Font-weight constant indicating a weight of 100 (extremely light).
static short	FONT_WEIGHT_200 Font-weight constant indicating a weight of 200 (very light).
static short	FONT_WEIGHT_300 Font-weight constant indicating a weight of 300 (light).
static short	FONT_WEIGHT_400 Font-weight constant indicating a weight of 400 (normal).
static short	FONT_WEIGHT_500 Font-weight constant indicating a weight of 500 (dark).
static short	FONT_WEIGHT_600 Font-weight constant indicating a weight of 600 (semi-bold).
static short	FONT_WEIGHT_700 Font-weight constant indicating a weight of 700 (bold).
static short	FONT_WEIGHT_800 Font-weight constant indicating a weight of 800 (extra bold).
static short	FONT_WEIGHT_900 Font-weight constant indicating a weight of 900 (black).
static short	FONT_WEIGHT_ANY Font-weight constant indicating no preference.
static short	FONT_WEIGHT_BOLD Font-weight constant indicating a weight of "bold", which is the same as FONT_WEIGHT_700.
static short	FONT_WEIGHT_NORMAL Font-weight constant indicating a weight of "normal", which is the same as FONT_WEIGHT_400.
static byte	FORMAT_OTF_CFF Font-format constant indicating that the font is an OpenType font with Compact Font Format (CFF) data (no TrueType outlines).
static byte	FORMAT_OTF_TRUETYPE Font-format constant indicating that the font is an OpenType font with TrueType outlines.
static byte	FORMAT_TRUETYPE Font-format constant indicating that the font is a TrueType font.
static byte	FORMAT_TYPE1 Font-format constant indicating that the font is a Type1 font.
static byte	FORMAT_UNKNOWN Font-format constant indicating that the font's format is not known.
static char	INVALID_UNICODE_CHARACTER Constant defining an invalid character value.
static byte	LH_ALGORITHM_DEFAULT Normal line-height computation constant indicating that the implementation is in complete control of the normal line-height computation.
static byte	WRITING_MODE_HORIZONTAL Constant indicating the writing mode is horizontal.
static byte	WRITING_MODE_VERTICAL Constant indicating the writing mode is vertical.

Method Summary

int	baseline(java.lang.String script) Determines which baseline should be used by this font for a specified script.
int	baselineOffset(int writingMode, int baselineType, int fontSize) Returns the location of the specified baseline.
int	getAscender(int fontSize) Returns the Ascender value for this font, scaled to a specific point size.
java.awt.Font	getAWTFont(int fontSize) If this Font has a java.awt.Font associated with it, return it.
int	getCapHeight(int fontSize) Returns the CapHeight value for this font, scaled to a specific point size.
int	getDefaultWidth() Returns the default glyph width for this font.
int	getDescender(int fontSize) Returns the Descender value for this font, scaled to a specific point size.
java.lang.String	getFamilyName() Returns this font's font-family name.
byte	getFontComplexity() Returns a value indicating whether this font is a simple or composite font.
byte	getFontFormat() Returns a value indicating what format (e.g.
java.lang.String	getFontName() Returns this font's name.
Encoding	getInternalEncoding() Get the font's internal Encoding scheme.
float	getItalicAngle() Returns the ItalicAngle value for this font.
java.lang.String	getPostscriptName() Returns the PostScript name of the font.
int	getStemV() Returns the StemV value for this font, used in a PDF Font Descriptor, as defined in the PDF Reference, Second Edition, Section 5.7.
int	getXHeight(int fontSize) Returns the XHeight value for this font, scaled to a specific point size.
boolean	isEmbeddable() Tells the client application whether this font can be embedded or not.
boolean	isPDFStandardFont() Indicates whether this font is one of the PDF Base-14 fonts.
boolean	isSubsettable() Tells the client application whether a subset of this font can be embedded.
int	kern(int char1, int char2) Computes the kerning needed between two glyphs in this font.
float	normalLineHeightFactor(int algorithm) Returns a factor suitable for computing a "normal" line-height as defined in the CSS and XSL-FO standards.
int	overlinePosition(int fontSize) The recommended position of the bottom of the overline stroke, relative to the baseline, in millipoints.
int	overlineSize(int fontSize) The recommended thickness, in millipoints, of the overline stroke for this font.
int	strikeoutPosition(int fontSize) The recommended position of the top of the strikeout stroke, relative to the baseline, in millipoints.
int	strikeoutSize(int fontSize) The recommended thickness, in millipoints, of the strikeout stroke for this font.
int	underlinePosition(int fontSize) The recommended position of the top of the underline stroke, relative to the baseline, in millipoints.
int	underlineSize(int fontSize) The recommended thickness, in millipoints, of the underline stroke for this font.
boolean	usableInPostScriptOutput() Indicates whether this font can be referenced within a PostScript file.
int	width(java.lang.CharSequence chars, int fontSize, int letterSpacing, int wordSpacing) Calculates the width of a given String, considering letter spacing, word spacing, and kerning.
int	width(int codePoint, int fontSize) Returns the width of a Unicode character for this font, at a specified point size.
int	widthEstimate(int codePoint, int fontSize) Returns the estimated width of a Unicode character for this font, at a specified point size.

Methods inherited from interface java.lang.Comparable

compareTo

Field Detail

INVALID_UNICODE_CHARACTER

public static final char INVALID_UNICODE_CHARACTER

Constant defining an invalid character value.

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Constant Field Values

FONT_STYLE_NORMAL

public static final byte FONT_STYLE_NORMAL

Font-style constant indicating an upright (Roman) typeface.

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FONT_STYLE_ITALIC

public static final byte FONT_STYLE_ITALIC

Font-style constant indicating an italic typeface.

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FONT_STYLE_OBLIQUE

public static final byte FONT_STYLE_OBLIQUE

Font-style constant indicating an oblique typeface.

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FONT_STYLE_BACKSLANT

public static final byte FONT_STYLE_BACKSLANT

Font-style constant indicating a backslant typeface.

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FONT_STYLE_ANY

public static final byte FONT_STYLE_ANY

Font-style constant indicating no preference.

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Constant Field Values

FONT_WEIGHT_100

public static final short FONT_WEIGHT_100

Font-weight constant indicating a weight of 100 (extremely light).

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FONT_WEIGHT_200

public static final short FONT_WEIGHT_200

Font-weight constant indicating a weight of 200 (very light).

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FONT_WEIGHT_300

public static final short FONT_WEIGHT_300

Font-weight constant indicating a weight of 300 (light).

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FONT_WEIGHT_400

public static final short FONT_WEIGHT_400

Font-weight constant indicating a weight of 400 (normal).

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FONT_WEIGHT_500

public static final short FONT_WEIGHT_500

Font-weight constant indicating a weight of 500 (dark).

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FONT_WEIGHT_600

public static final short FONT_WEIGHT_600

Font-weight constant indicating a weight of 600 (semi-bold).

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FONT_WEIGHT_700

public static final short FONT_WEIGHT_700

Font-weight constant indicating a weight of 700 (bold).

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FONT_WEIGHT_800

public static final short FONT_WEIGHT_800

Font-weight constant indicating a weight of 800 (extra bold).

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FONT_WEIGHT_900

public static final short FONT_WEIGHT_900

Font-weight constant indicating a weight of 900 (black).

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FONT_WEIGHT_NORMAL

public static final short FONT_WEIGHT_NORMAL

Font-weight constant indicating a weight of "normal", which is the same as FONT_WEIGHT_400.

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FONT_WEIGHT_BOLD

public static final short FONT_WEIGHT_BOLD

Font-weight constant indicating a weight of "bold", which is the same as FONT_WEIGHT_700.

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FONT_WEIGHT_ANY

public static final short FONT_WEIGHT_ANY

Font-weight constant indicating no preference.

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FONT_VARIANT_NORMAL

public static final byte FONT_VARIANT_NORMAL

Font-variant constant indicating that small-caps is not on.

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FONT_VARIANT_SMALL_CAPS

public static final byte FONT_VARIANT_SMALL_CAPS

Font-variant constant indicating that small-caps is on.

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FONT_VARIANT_ANY

public static final byte FONT_VARIANT_ANY

Font-variant constant indicating no preference.

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FONT_STRETCH_ULTRA_CONDENSED

public static final byte FONT_STRETCH_ULTRA_CONDENSED

Font-stretch constant indicating ultra-condensed.

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FONT_STRETCH_EXTRA_CONDENSED

public static final byte FONT_STRETCH_EXTRA_CONDENSED

Font-stretch constant indicating extra-condensed.

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FONT_STRETCH_CONDENSED

public static final byte FONT_STRETCH_CONDENSED

Font-stretch constant indicating condensed.

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FONT_STRETCH_SEMI_CONDENSED

public static final byte FONT_STRETCH_SEMI_CONDENSED

Font-stretch constant indicating semi-condensed.

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FONT_STRETCH_NORMAL

public static final byte FONT_STRETCH_NORMAL

Font-stretch constant indicating normal.

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FONT_STRETCH_SEMI_EXPANDED

public static final byte FONT_STRETCH_SEMI_EXPANDED

Font-stretch constant indicating semi-expanded.

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FONT_STRETCH_EXPANDED

public static final byte FONT_STRETCH_EXPANDED

Font-stretch constant indicating expanded.

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FONT_STRETCH_EXTRA_EXPANDED

public static final byte FONT_STRETCH_EXTRA_EXPANDED

Font-stretch constant indicating extra-expanded.

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FONT_STRETCH_ULTRA_EXPANDED

public static final byte FONT_STRETCH_ULTRA_EXPANDED

Font-stretch constant indicating ultra-expanded.

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FONT_STRETCH_ANY

public static final byte FONT_STRETCH_ANY

Font-stretch constant indicating no preference.

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FONT_SELECTION_CBC

public static final byte FONT_SELECTION_CBC

font-selection-strategy constant indicating "character-by-character".

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FONT_SELECTION_AUTO

public static final byte FONT_SELECTION_AUTO

font-selection-strategy constant indicating "auto".

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FONT_COMPLEXITY_UNKNOWN

public static final byte FONT_COMPLEXITY_UNKNOWN

Font-complexity constant indicating that the complexity is not known.

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FONT_SIMPLE

public static final byte FONT_SIMPLE

Font-complexity constant indicating that the font is a simple font.

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FONT_COMPOSITE

public static final byte FONT_COMPOSITE

Font-complexity constant indicating that the font is a composite font.

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FORMAT_UNKNOWN

public static final byte FORMAT_UNKNOWN

Font-format constant indicating that the font's format is not known.

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FORMAT_TYPE1

public static final byte FORMAT_TYPE1

Font-format constant indicating that the font is a Type1 font.

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FORMAT_TRUETYPE

public static final byte FORMAT_TRUETYPE

Font-format constant indicating that the font is a TrueType font.

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FORMAT_OTF_TRUETYPE

public static final byte FORMAT_OTF_TRUETYPE

Font-format constant indicating that the font is an OpenType font with TrueType outlines.

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FORMAT_OTF_CFF

public static final byte FORMAT_OTF_CFF

Font-format constant indicating that the font is an OpenType font with Compact Font Format (CFF) data (no TrueType outlines).

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LH_ALGORITHM_DEFAULT

public static final byte LH_ALGORITHM_DEFAULT

Normal line-height computation constant indicating that the implementation is in complete control of the normal line-height computation.

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WRITING_MODE_HORIZONTAL

public static final byte WRITING_MODE_HORIZONTAL

Constant indicating the writing mode is horizontal.

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WRITING_MODE_VERTICAL

public static final byte WRITING_MODE_VERTICAL

Constant indicating the writing mode is vertical.

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Method Detail

getAscender

public int getAscender(int fontSize)

Returns the Ascender value for this font, scaled to a specific point size.

Parameters:

fontSize - The font size, in millipoints.

Returns:

The Ascender value, in millipoints.

getDescender

public int getDescender(int fontSize)

Returns the Descender value for this font, scaled to a specific point size.

Parameters:

fontSize - The font size, in millipoints.

Returns:

The Descender value, in millipoints.

getCapHeight

public int getCapHeight(int fontSize)

Returns the CapHeight value for this font, scaled to a specific point size.

Parameters:

fontSize - The font size, in millipoints.

Returns:

The CapHeight value, in millipoints.

getXHeight

public int getXHeight(int fontSize)

Returns the XHeight value for this font, scaled to a specific point size.

Parameters:

fontSize - The font size, in millipoints.

Returns:

The XHeight value, in millipoints.

width

public int width(int codePoint,
                 int fontSize)

Returns the width of a Unicode character for this font, at a specified point size.

Parameters:

codePoint - The Unicode character for which the width should be returned.

fontSize - The size, in millipoints, of the font.

Returns:

The width, in millipoints, of the glyph in this font for codePoint, or Integer.MIN_VALUE if such a glyph is not found.

width

public int width(java.lang.CharSequence chars,
                 int fontSize,
                 int letterSpacing,
                 int wordSpacing)

Calculates the width of a given String, considering letter spacing, word spacing, and kerning.

Parameters:

chars - The String whose width should be computed.

fontSize - The size, in millipoints, of the font.

letterSpacing - The size, in millipoints, of any letter-spacing.

wordSpacing - The size, in millipoints, of any word-spacing.

Returns:

The width, in millipoints, of string. Letter-spacing and kerning are added between characters in string, but are not added either before or after. (Adding letter-spacing or kerning before or after would require making assumptions about the context of string, including whether it is at the beginning or end of the line, what fonts surround it, etc.) Word-spacing is added only to space characters (0x20). Any other whitespace characters that the client applications wishes to have considered as word-spacing must first be normalized to 0x20. If there is no glyph for a character in string , the width returned will be that of the "missing glyph".

widthEstimate

public int widthEstimate(int codePoint,
                         int fontSize)

Returns the estimated width of a Unicode character for this font, at a specified point size. This method is implementation-dependent. It may attempt to estimate the size of characters such as hair spaces and em quads, which may not be available in the font, but which can be simulated in output if the size is known. Presumably, this method should be used only after width(int, int) has indicated that the font cannot return a true width.

Parameters:

codePoint - The Unicode character for which the width should be returned.

fontSize - The size, in millipoints, of the font.

Returns:

The width, in millipoints, of the estimated size of this glyph in this font for codePoint, or Integer.MIN_VALUE if the implementation cannot estimate such a width.

isEmbeddable

public boolean isEmbeddable()

Tells the client application whether this font can be embedded or not.

Returns:

True if this font can be embedded.

isSubsettable

public boolean isSubsettable()

Tells the client application whether a subset of this font can be embedded.

Returns:

True if a subset of this font can be embedded.

getAWTFont

public java.awt.Font getAWTFont(int fontSize)

If this Font has a java.awt.Font associated with it, return it.

Parameters:

fontSize - The font size, in millipoints.

Returns:

The related Font instance, if there is one, otherwise null.

usableInPostScriptOutput

public boolean usableInPostScriptOutput()

Indicates whether this font can be referenced within a PostScript file.

Returns:

True if this font can be referenced within a PostScript file.

getFamilyName

public java.lang.String getFamilyName()

Returns this font's font-family name. For example, a font named "Bitstream Charter Italic" in font-family "Bitstream Charter", with PostScript name "CharterBT-Italic", should return "Bitstream Charter".

Returns:

This font's font-family name.

See Also:

getFontName(), getPostscriptName()

getFontName

public java.lang.String getFontName()

Returns this font's name. For example, a font named "Bitstream Charter Italic" in font-family "Bitstream Charter", with PostScript name "CharterBT-Italic", should return "Bitstream Charter Italic".

Returns:

This font's name.

See Also:

getFamilyName(), getPostscriptName()

getPostscriptName

public java.lang.String getPostscriptName()

Returns the PostScript name of the font. For example, a font named "Bitstream Charter Italic" in font-family "Bitstream Charter", with PostScript name "CharterBT-Italic", should return "CharterBT-Italic".

Returns:

The PostScript name of the font.

See Also:

getFamilyName(), getFontName()

getInternalEncoding

public Encoding getInternalEncoding()

Get the font's internal Encoding scheme. Note that this may be different from the Encoding scheme actually used to encode characters by the font.

Returns:

The font's internal Encoding scheme.

See Also:

FontUse.getEncoding()

getFontComplexity

public byte getFontComplexity()

Returns a value indicating whether this font is a simple or composite font.

Returns:

One of the following: FONT_COMPLEXITY_UNKNOWN, FONT_SIMPLE, or FONT_COMPOSITE.

getFontFormat

public byte getFontFormat()

Returns a value indicating what format (e.g. Type1, TrueType) this font is.

Returns:

One of the following: FORMAT_UNKNOWN, FORMAT_TYPE1, or FORMAT_TRUETYPE.

kern

public int kern(int char1,
                int char2)

Computes the kerning needed between two glyphs in this font.

Parameters:

char1 - The Unicode code point of the first (left in a left-to-right system) character.

char2 - The Unicode code point of the second (right in left-to-right system) character.

Returns:

The distance in 1/1000ths of a text space unit of the kerning. A positive amount means that the characters should be moved farther apart, and a negative amount means that they should be moved closer together.

getItalicAngle

public float getItalicAngle()

Returns the ItalicAngle value for this font.

Returns:

The ItalicAngle value, expressed in degrees counterclockwise from vertical.

getStemV

public int getStemV()

Returns the StemV value for this font, used in a PDF Font Descriptor, as defined in the PDF Reference, Second Edition, Section 5.7.

Returns:

The StemV value, in 1/1000ths of a text space unit.

getDefaultWidth

public int getDefaultWidth()

Returns the default glyph width for this font.

Returns:

The default glyph width for this font, expressed in 1/1000ths of a text space unit.

isPDFStandardFont

public boolean isPDFStandardFont()

Indicates whether this font is one of the PDF Base-14 fonts.

Returns:

True if this font is one of the PDF Base-14 fonts.

normalLineHeightFactor

public float normalLineHeightFactor(int algorithm)

Returns a factor suitable for computing a "normal" line-height as defined in the CSS and XSL-FO standards. The line-height is the distance, including leading, between the baselines of stacked lines of text. The CSS and XSL-FO standards recommend that the "normal" value for line-height fall between 1.0 and 1.2. (see Section 7.15.4 of XSL-FO 1.0) This method attempts to find a suitable value based on the characteristics of the font itself.

Design Note 1: This method returns a float factor instead of a computation of the actual line-height to facilitate the handling of inheritance where that is required. For example, for CSS and XSL-FO, the factor is what is inherited instead of the computed line-height.

Parameters:

algorithm - The specifier of an algorithm that should be used to compute the factor. Valid values include LH_ALGORITHM_DEFAULT, which puts the implementation in complete control of the computation. Other algorithms may be added in the future.

Returns:

The factor to be applied to the font-size to compute the "normal" line-height. For example, if the font-size is 12 points, and this method returns 1.2, the computed "normal" line-height is 14.4 points.

baselineOffset

public int baselineOffset(int writingMode,
                          int baselineType,
                          int fontSize)

Returns the location of the specified baseline. For fonts with explicit baseline data, returns that value. For other fonts, estimates the value.

Parameters:

writingMode - Constant indicating the direction in which the script is being written. Valid values are Constants.AXIS_HORIZONTAL and Constants.AXIS_VERTICAL.

baselineType - Constant indicating which baseline is sought. Valid values are Constants.BASELINE_ALPHABETIC, Constants.BASELINE_IDEOGRAPHIC, Constants.BASELINE_HANGING, Constants.BASELINE_MATHEMATICAL, Constants.BASELINE_CENTRAL, Constants.BASELINE_MIDDLE, Constants.BASELINE_TEXT_BEFORE_EDGE, and Constants.BASELINE_TEXT_AFTER_EDGE.

fontSize - The size, in millipoints, at which the font is scaled.

Returns:

The distance, in millipoints, from the leading edge of the em-box, at which the specified baseline is located.

baseline

public int baseline(java.lang.String script)

Determines which baseline should be used by this font for a specified script.

Parameters:

script - The ISO 15924 script name for which a baseline is sought.

Returns:

One of Constants.BASELINE_ALPHABETIC, Constants.BASELINE_IDEOGRAPHIC, Constants.BASELINE_HANGING, Constants.BASELINE_MATHEMATICAL, Constants.BASELINE_CENTRAL, Constants.BASELINE_MIDDLE, Constants.BASELINE_TEXT_BEFORE_EDGE, and Constants.BASELINE_TEXT_AFTER_EDGE.

underlineSize

public int underlineSize(int fontSize)

The recommended thickness, in millipoints, of the underline stroke for this font.

Parameters:

fontSize - The font size for which the underline thickness should be computed.

Returns:

The underline thickness, in millipoints.

underlinePosition

public int underlinePosition(int fontSize)

The recommended position of the top of the underline stroke, relative to the baseline, in millipoints. Positive values represent distances above the baseline, while negative values represent distances below the baseline.

Parameters:

fontSize - The font size for which the underline position should be computed.

Returns:

The underline position, in millipoints.

overlineSize

public int overlineSize(int fontSize)

The recommended thickness, in millipoints, of the overline stroke for this font.

Parameters:

fontSize - The font size for which the overline thickness should be computed.

Returns:

The overline thickness, in millipoints.

overlinePosition

public int overlinePosition(int fontSize)

The recommended position of the bottom of the overline stroke, relative to the baseline, in millipoints. Positive values represent distances above the baseline, while negative values represent distances below the baseline.

Parameters:

fontSize - The font size for which the overline position should be computed.

Returns:

The overline position, in millipoints.

strikeoutSize

public int strikeoutSize(int fontSize)

The recommended thickness, in millipoints, of the strikeout stroke for this font.

Parameters:

fontSize - The font size for which the strikeout thickness should be computed.

Returns:

The strikout thickness, in millipoints.

strikeoutPosition

public int strikeoutPosition(int fontSize)

The recommended position of the top of the strikeout stroke, relative to the baseline, in millipoints. Positive values represent distances above the baseline, while negative values represent distances below the baseline.

Parameters:

fontSize - The font size for which the strikeout position should be computed.

Returns:

The strikeout position, in millipoints.