Package org.apache.fop.afp.fonts
Class CharacterSet
java.lang.Object
org.apache.fop.afp.fonts.CharacterSet
- Direct Known Subclasses:
FopCharacterSet
The IBM Font Object Content Architecture (FOCA) supports presentation
of character shapes by defining their characteristics, which include
font description information for identifying the characters, font metric
information for positioning the characters, and character shape information
for presenting the character images.
Presenting a graphic character on a presentation surface requires information on the rotation and position of character on the physical or logical page.
This class proivdes font metric information for a particular font as identified by the character set name. This information is obtained directly from the AFP font files which must be installed in the path specified in the afp-fonts xml definition file.
Presenting a graphic character on a presentation surface requires information on the rotation and position of character on the physical or logical page.
This class proivdes font metric information for a particular font as identified by the character set name. This information is obtained directly from the AFP font files which must be installed in the path specified in the afp-fonts xml definition file.
-
Field Summary
Modifier and TypeFieldDescriptionprotected final String
The code page to which the character set relatesstatic final String
default codepagestatic final String
default encodingprotected final String
The encoding used for the code pageprotected static final org.apache.commons.logging.Log
Static logging instanceprotected final String
The character set relating to the fontstatic final int
The current orientation (currently only 0 is supported by FOP) -
Method Summary
Modifier and TypeMethodDescriptionvoid
Add character set metric information for the different orientationsencodeChars
(CharSequence chars) Encodes a character sequence to a byte array.int
Ascender height is the distance from the character baseline to the top of the character box.int
Cap height is the average height of the uppercase characters in a font.getCharacterBox
(char character, int size) Returns the AFP code page identifierint
Descender depth is the distance from the character baseline to the bottom of a character box.int
Returns the increment for an em space.Returns the AFP code page encodinggetName()
Returns the AFP character set identifierbyte[]
Returns the AFP character set identifier as a byte arrayint
Returns the nominal character increment.int
Returns the nominal vertical size of the font in the case of bitmap fonts.Returns the resource accessor to load the font resources with.int
Returns the increment for an space.int
Return the position for an underscore (_) character.int
Return the width to use for an underscore (_) character.int
getWidth
(char character, int size) Get the width (in 1/1000ths of a point size) of the character identified by the parameter passed.int
XHeight refers to the height of the lower case letters above the baseline.boolean
hasChar
(char c) Indicates whether the given char in the character set.char
mapChar
(char c) Map a Unicode character to a code point in the font.void
setNominalVerticalSize
(int nominalVerticalSize) Sets the nominal vertical size of the font in the case of bitmap fonts.
-
Field Details
-
LOG
protected static final org.apache.commons.logging.Log LOGStatic logging instance -
DEFAULT_CODEPAGE
default codepage- See Also:
-
DEFAULT_ENCODING
default encoding- See Also:
-
SUPPORTED_ORIENTATION
public static final int SUPPORTED_ORIENTATIONThe current orientation (currently only 0 is supported by FOP)- See Also:
-
codePage
The code page to which the character set relates -
encoding
The encoding used for the code page -
name
The character set relating to the font
-
-
Method Details
-
addCharacterSetOrientation
Add character set metric information for the different orientations- Parameters:
cso
- the metrics for the orientation
-
setNominalVerticalSize
public void setNominalVerticalSize(int nominalVerticalSize) Sets the nominal vertical size of the font in the case of bitmap fonts.- Parameters:
nominalVerticalSize
- the nominal vertical size (in millipoints)
-
getNominalVerticalSize
public int getNominalVerticalSize()Returns the nominal vertical size of the font in the case of bitmap fonts. For outline fonts, zero is returned, because these are scalable fonts.- Returns:
- the nominal vertical size (in millipoints) for bitmap fonts, or 0 for outline fonts.
-
getAscender
public int getAscender()Ascender height is the distance from the character baseline to the top of the character box. A negative ascender height signifies that all of the graphic character is below the character baseline. For a character rotation other than 0, ascender height loses its meaning when the character is lying on its side or is upside down with respect to normal viewing orientation. For the general case, Ascender Height is the characters most positive y-axis value. For bounded character boxes, for a given character having an ascender, ascender height and baseline offset are equal.- Returns:
- the ascender value in millipoints
-
getUnderscoreWidth
public int getUnderscoreWidth()Return the width to use for an underscore (_) character.- Returns:
- the width of an underscore character
-
getUnderscorePosition
public int getUnderscorePosition()Return the position for an underscore (_) character.- Returns:
- the position of an underscore character
-
getCapHeight
public int getCapHeight()Cap height is the average height of the uppercase characters in a font. This value is specified by the designer of a font and is usually the height of the uppercase M.- Returns:
- the cap height value in millipoints
-
getDescender
public int getDescender()Descender depth is the distance from the character baseline to the bottom of a character box. A negative descender depth signifies that all of the graphic character is above the character baseline.- Returns:
- the descender value in millipoints
-
getResourceAccessor
Returns the resource accessor to load the font resources with.- Returns:
- the resource accessor to load the font resources with
-
getXHeight
public int getXHeight()XHeight refers to the height of the lower case letters above the baseline.- Returns:
- the typical height of characters
-
getWidth
public int getWidth(char character, int size) Get the width (in 1/1000ths of a point size) of the character identified by the parameter passed.- Parameters:
character
- the Unicode character from which the width will be calculatedsize
- the font size- Returns:
- the width of the character
-
getCharacterBox
-
getName
Returns the AFP character set identifier- Returns:
- the AFP character set identifier
-
getNameBytes
public byte[] getNameBytes()Returns the AFP character set identifier as a byte array- Returns:
- the AFP character set identifier as a byte array
-
getCodePage
Returns the AFP code page identifier- Returns:
- the AFP code page identifier
-
getEncoding
Returns the AFP code page encoding- Returns:
- the AFP code page encoding
-
hasChar
public boolean hasChar(char c) Indicates whether the given char in the character set.- Parameters:
c
- the character to check- Returns:
- true if the character is in the character set
-
encodeChars
public CharactersetEncoder.EncodedChars encodeChars(CharSequence chars) throws CharacterCodingException Encodes a character sequence to a byte array.- Parameters:
chars
- the characters- Returns:
- the encoded characters
- Throws:
CharacterCodingException
- if the encoding operation fails
-
mapChar
public char mapChar(char c) Map a Unicode character to a code point in the font. The code tables are already converted to Unicode therefore we can use the identity mapping.- Parameters:
c
- the Unicode character to map- Returns:
- the mapped character
-
getSpaceIncrement
public int getSpaceIncrement()Returns the increment for an space.- Returns:
- the space increment
-
getEmSpaceIncrement
public int getEmSpaceIncrement()Returns the increment for an em space.- Returns:
- the em space increment
-
getNominalCharIncrement
public int getNominalCharIncrement()Returns the nominal character increment.- Returns:
- the nominal character increment
-