Class Font
- All Implemented Interfaces:
Serializable
- Direct Known Subclasses:
FontUIResource
Font
class represents fonts, which are used to
render text in a visible way.
A font provides the information needed to map sequences of
characters to sequences of glyphs
and to render sequences of glyphs on Graphics
and
Component
objects.
Characters and Glyphs
A character is a symbol that represents an item such as a letter, a digit, or punctuation in an abstract way. For example,'g'
,
LATIN SMALL LETTER G, is a character.
A glyph is a shape used to render a character or a sequence of characters. In simple writing systems, such as Latin, typically one glyph represents one character. In general, however, characters and glyphs do not have one-to-one correspondence. For example, the character 'á' LATIN SMALL LETTER A WITH ACUTE, can be represented by two glyphs: one for 'a' and one for '´'. On the other hand, the two-character string "fi" can be represented by a single glyph, an "fi" ligature. In complex writing systems, such as Arabic or the South and South-East Asian writing systems, the relationship between characters and glyphs can be more complicated and involve context-dependent selection of glyphs as well as glyph reordering. A font encapsulates the collection of glyphs needed to render a selected set of characters as well as the tables needed to map sequences of characters to corresponding sequences of glyphs.
Physical and Logical Fonts
The Java Platform distinguishes between two kinds of fonts: physical fonts and logical fonts.
Physical fonts are the actual font libraries containing glyph data
and tables to map from character sequences to glyph sequences, using a font
technology such as TrueType or PostScript Type 1.
All implementations of the Java Platform must support TrueType fonts;
support for other font technologies is implementation dependent.
Physical fonts may use names such as Helvetica, Palatino, HonMincho, or
any number of other font names.
Typically, each physical font supports only a limited set of writing
systems, for example, only Latin characters or only Japanese and Basic
Latin.
The set of available physical fonts varies between configurations.
Applications that require specific fonts can bundle them and instantiate
them using the createFont
method.
Logical fonts are the five font families defined by the Java platform which must be supported by any Java runtime environment: Serif, SansSerif, Monospaced, Dialog, and DialogInput. These logical fonts are not actual font libraries. Instead, the logical font names are mapped to physical fonts by the Java runtime environment. The mapping is implementation and usually locale dependent, so the look and the metrics provided by them vary. Typically, each logical font name maps to several physical fonts in order to cover a large range of characters.
Peered AWT components, such as Label
and
TextField
, can only use logical fonts.
For a discussion of the relative advantages and disadvantages of using physical or logical fonts, see the Physical and Logical Fonts in The Java Tutorials document.
Font Faces and Names
AFont
can have many faces, such as heavy, medium, oblique, gothic and
regular. All of these faces have similar typographic design.
There are three different names that you can get from a
Font
object. The logical font name is simply the
name that was used to construct the font.
The font face name, or just font name for
short, is the name of a particular font face, like Helvetica Bold. The
family name is the name of the font family that determines the
typographic design across several faces, like Helvetica.
The Font
class represents an instance of a font face from
a collection of font faces that are present in the system resources
of the host system. As examples, Arial Bold and Courier Bold Italic
are font faces. There can be several Font
objects
associated with a font face, each differing in size, style, transform
and font features.
Glyphs may not always be rendered with the requested properties (e.g, font and style) due to platform limitations such as the absence of suitable platform fonts to implement a logical font.
The getAllFonts
method
of the GraphicsEnvironment
class returns an
array of all font faces available in the system. These font faces are
returned as Font
objects with a size of 1, identity
transform and default font features. These
base fonts can then be used to derive new Font
objects
with varying sizes, styles, transforms and font features via the
deriveFont
methods in this class.
Font and TextAttribute
Font
supports most
TextAttribute
s. This makes some operations, such as
rendering underlined text, convenient since it is not
necessary to explicitly construct a TextLayout
object.
Attributes can be set on a Font by constructing or deriving it
using a Map
of TextAttribute
values.
The values of some TextAttributes
are not
serializable, and therefore attempting to serialize an instance of
Font
that has such values will not serialize them.
This means a Font deserialized from such a stream will not compare
equal to the original Font that contained the non-serializable
attributes. This should very rarely pose a problem
since these attributes are typically used only in special
circumstances and are unlikely to be serialized.
FOREGROUND
andBACKGROUND
usePaint
values. The subclassColor
is serializable, whileGradientPaint
andTexturePaint
are not.CHAR_REPLACEMENT
usesGraphicAttribute
values. The subclassesShapeGraphicAttribute
andImageGraphicAttribute
are not serializable.INPUT_METHOD_HIGHLIGHT
usesInputMethodHighlight
values, which are not serializable. SeeInputMethodHighlight
.
Clients who create custom subclasses of Paint
and
GraphicAttribute
can make them serializable and
avoid this problem. Clients who use input method highlights can
convert these to the platform-specific attributes for that
highlight on the current platform and set them on the Font as
a workaround.
The Map
-based constructor and
deriveFont
APIs ignore the FONT attribute, and it is
not retained by the Font; the static getFont(Map)
method should
be used if the FONT attribute might be present. See TextAttribute.FONT
for more information.
Several attributes will cause additional rendering overhead
and potentially invoke layout. If a Font
has such
attributes, the
method
will return true.hasLayoutAttributes()
Note: Font rotations can cause text baselines to be rotated. In order to account for this (rare) possibility, font APIs are specified to return metrics and take parameters 'in baseline-relative coordinates'. This maps the 'x' coordinate to the advance along the baseline, (positive x is forward along the baseline), and the 'y' coordinate to a distance along the perpendicular to the baseline at 'x' (positive y is 90 degrees clockwise from the baseline vector). APIs for which this is especially important are called out as having 'baseline-relative coordinates.'
- See Also:
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Field Summary
Modifier and TypeFieldDescriptionstatic final int
The bold style constant.static final int
The baseline used in ideographic scripts like Chinese, Japanese, and Korean when laying out text.static final String
A String constant for the canonical family name of the logical font "Dialog".static final String
A String constant for the canonical family name of the logical font "DialogInput".static final int
The baseline used in Devanagari and similar scripts when laying out text.static final int
The italicized style constant.static final int
A flag to layoutGlyphVector indicating that text is left-to-right as determined by Bidi analysis.static final int
A flag to layoutGlyphVector indicating that text in the char array after the indicated limit should not be examined.static final int
A flag to layoutGlyphVector indicating that text in the char array before the indicated start should not be examined.static final int
A flag to layoutGlyphVector indicating that text is right-to-left as determined by Bidi analysis.static final String
A String constant for the canonical family name of the logical font "Monospaced".protected String
The logical name of thisFont
, as passed to the constructor.static final int
The plain style constant.protected float
The point size of thisFont
infloat
.static final int
The baseline used in most Roman scripts when laying out text.static final String
A String constant for the canonical family name of the logical font "SansSerif".static final String
A String constant for the canonical family name of the logical font "Serif".protected int
The point size of thisFont
, rounded to integer.protected int
The style of thisFont
, as passed to the constructor.static final int
Identify a font resource of type TRUETYPE.static final int
Identify a font resource of type TYPE1. -
Constructor Summary
ModifierConstructorDescriptionprotected
Creates a newFont
from the specifiedfont
.Creates a newFont
from the specified name, style and point size.Font
(Map<? extends AttributedCharacterIterator.Attribute, ?> attributes) Creates a newFont
with the specified attributes. -
Method Summary
Modifier and TypeMethodDescriptionboolean
canDisplay
(char c) Checks if thisFont
has a glyph for the specified character.boolean
canDisplay
(int codePoint) Checks if thisFont
has a glyph for the specified character.int
canDisplayUpTo
(char[] text, int start, int limit) Indicates whether or not thisFont
can display the characters in the specifiedtext
starting atstart
and ending atlimit
.int
canDisplayUpTo
(String str) Indicates whether or not thisFont
can display a specifiedString
.int
canDisplayUpTo
(CharacterIterator iter, int start, int limit) Indicates whether or not thisFont
can display the text specified by theiter
starting atstart
and ending atlimit
.static Font
createFont
(int fontFormat, File fontFile) Returns a newFont
using the specified font type and the specified font file.static Font
createFont
(int fontFormat, InputStream fontStream) Returns a newFont
using the specified font type and input data.static Font[]
createFonts
(File fontFile) Returns a new array ofFont
decoded from the specified file.static Font[]
createFonts
(InputStream fontStream) Returns a new array ofFont
decoded from the specified stream.createGlyphVector
(FontRenderContext frc, char[] chars) Creates aGlyphVector
by mapping characters to glyphs one-to-one based on the Unicode cmap in thisFont
.createGlyphVector
(FontRenderContext frc, int[] glyphCodes) Creates aGlyphVector
by mapping characters to glyphs one-to-one based on the Unicode cmap in thisFont
.createGlyphVector
(FontRenderContext frc, String str) Creates aGlyphVector
by mapping characters to glyphs one-to-one based on the Unicode cmap in thisFont
.Creates aGlyphVector
by mapping the specified characters to glyphs one-to-one based on the Unicode cmap in thisFont
.static Font
Returns theFont
that thestr
argument describes.deriveFont
(float size) Creates a newFont
object by replicating the currentFont
object and applying a new size to it.deriveFont
(int style) Creates a newFont
object by replicating the currentFont
object and applying a new style to it.deriveFont
(int style, float size) Creates a newFont
object by replicating thisFont
object and applying a new style and size.deriveFont
(int style, AffineTransform trans) Creates a newFont
object by replicating thisFont
object and applying a new style and transform.deriveFont
(AffineTransform trans) Creates a newFont
object by replicating the currentFont
object and applying a new transform to it.deriveFont
(Map<? extends AttributedCharacterIterator.Attribute, ?> attributes) Creates a newFont
object by replicating the currentFont
object and applying a new set of font attributes to it.boolean
Compares thisFont
object to the specifiedObject
.Map
<TextAttribute, ?> Returns a map of font attributes available in thisFont
.Returns the keys of all the attributes supported by thisFont
.byte
getBaselineFor
(char c) Returns the baseline appropriate for displaying this character.Returns the family name of thisFont
.Returns the family name of thisFont
, localized for the specified locale.static Font
Returns aFont
object from the system properties list.static Font
Gets the specifiedFont
from the system properties list.static Font
getFont
(Map<? extends AttributedCharacterIterator.Attribute, ?> attributes) Returns aFont
appropriate to the attributes.Returns the font face name of thisFont
.Returns the font face name of theFont
, localized for the specified locale.float
Returns the italic angle of thisFont
.getLineMetrics
(char[] chars, int beginIndex, int limit, FontRenderContext frc) Returns aLineMetrics
object created with the specified arguments.getLineMetrics
(String str, int beginIndex, int limit, FontRenderContext frc) Returns aLineMetrics
object created with the specified arguments.getLineMetrics
(String str, FontRenderContext frc) getLineMetrics
(CharacterIterator ci, int beginIndex, int limit, FontRenderContext frc) Returns aLineMetrics
object created with the specified arguments.Returns the bounds for the character with the maximum bounds as defined in the specifiedFontRenderContext
.int
Returns the glyphCode which is used when thisFont
does not have a glyph for a specified unicode code point.getName()
Returns the logical name of thisFont
.int
Returns the number of glyphs in thisFont
.Returns the postscript name of thisFont
.int
getSize()
Returns the point size of thisFont
, rounded to an integer.float
Returns the point size of thisFont
infloat
value.getStringBounds
(char[] chars, int beginIndex, int limit, FontRenderContext frc) Returns the logical bounds of the specified array of characters in the specifiedFontRenderContext
.getStringBounds
(String str, int beginIndex, int limit, FontRenderContext frc) Returns the logical bounds of the specifiedString
in the specifiedFontRenderContext
.getStringBounds
(String str, FontRenderContext frc) Returns the logical bounds of the specifiedString
in the specifiedFontRenderContext
.getStringBounds
(CharacterIterator ci, int beginIndex, int limit, FontRenderContext frc) Returns the logical bounds of the characters indexed in the specifiedCharacterIterator
in the specifiedFontRenderContext
.int
getStyle()
Returns the style of thisFont
.Returns a copy of the transform associated with thisFont
.int
hashCode()
Returns a hashcode for thisFont
.boolean
Return true if this Font contains attributes that require extra layout processing.boolean
Checks whether or not thisFont
has uniform line metrics.boolean
isBold()
Indicates whether or not thisFont
object's style is BOLD.boolean
isItalic()
Indicates whether or not thisFont
object's style is ITALIC.boolean
isPlain()
Indicates whether or not thisFont
object's style is PLAIN.boolean
Indicates whether or not thisFont
object has a transform that affects its size in addition to the Size attribute.layoutGlyphVector
(FontRenderContext frc, char[] text, int start, int limit, int flags) Returns a newGlyphVector
object, performing full layout of the text if possible.static boolean
textRequiresLayout
(char[] chars, int start, int end) Returns true if any part of the specified text is from a complex script for which the implementation will need to invoke layout processing in order to render correctly when usingdrawString(String,int,int)
and other text rendering methods.toString()
Converts thisFont
object to aString
representation.
-
Field Details
-
DIALOG
A String constant for the canonical family name of the logical font "Dialog". It is useful in Font construction to provide compile-time verification of the name.- Since:
- 1.6
- See Also:
-
DIALOG_INPUT
A String constant for the canonical family name of the logical font "DialogInput". It is useful in Font construction to provide compile-time verification of the name.- Since:
- 1.6
- See Also:
-
SANS_SERIF
A String constant for the canonical family name of the logical font "SansSerif". It is useful in Font construction to provide compile-time verification of the name.- Since:
- 1.6
- See Also:
-
SERIF
A String constant for the canonical family name of the logical font "Serif". It is useful in Font construction to provide compile-time verification of the name.- Since:
- 1.6
- See Also:
-
MONOSPACED
A String constant for the canonical family name of the logical font "Monospaced". It is useful in Font construction to provide compile-time verification of the name.- Since:
- 1.6
- See Also:
-
PLAIN
public static final int PLAINThe plain style constant.- See Also:
-
BOLD
public static final int BOLDThe bold style constant. This can be combined with the other style constants (except PLAIN) for mixed styles.- See Also:
-
ITALIC
public static final int ITALICThe italicized style constant. This can be combined with the other style constants (except PLAIN) for mixed styles.- See Also:
-
ROMAN_BASELINE
public static final int ROMAN_BASELINEThe baseline used in most Roman scripts when laying out text.- See Also:
-
CENTER_BASELINE
public static final int CENTER_BASELINEThe baseline used in ideographic scripts like Chinese, Japanese, and Korean when laying out text.- See Also:
-
HANGING_BASELINE
public static final int HANGING_BASELINEThe baseline used in Devanagari and similar scripts when laying out text.- See Also:
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TRUETYPE_FONT
public static final int TRUETYPE_FONTIdentify a font resource of type TRUETYPE. Used to specify a TrueType font resource to thecreateFont(int, InputStream)
method. The TrueType format was extended to become the OpenType format, which adds support for fonts with Postscript outlines, this tag therefore references these fonts, as well as those with TrueType outlines.- Since:
- 1.3
- See Also:
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TYPE1_FONT
public static final int TYPE1_FONTIdentify a font resource of type TYPE1. Used to specify a Type1 font resource to thecreateFont(int, InputStream)
method.- Since:
- 1.5
- See Also:
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name
The logical name of thisFont
, as passed to the constructor.- Since:
- 1.0
- See Also:
-
style
protected int styleThe style of thisFont
, as passed to the constructor. This style can be PLAIN, BOLD, ITALIC, or BOLD+ITALIC.- Since:
- 1.0
- See Also:
-
size
protected int sizeThe point size of thisFont
, rounded to integer.- Since:
- 1.0
- See Also:
-
pointSize
protected float pointSizeThe point size of thisFont
infloat
.- See Also:
-
LAYOUT_LEFT_TO_RIGHT
public static final int LAYOUT_LEFT_TO_RIGHTA flag to layoutGlyphVector indicating that text is left-to-right as determined by Bidi analysis.- See Also:
-
LAYOUT_RIGHT_TO_LEFT
public static final int LAYOUT_RIGHT_TO_LEFTA flag to layoutGlyphVector indicating that text is right-to-left as determined by Bidi analysis.- See Also:
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LAYOUT_NO_START_CONTEXT
public static final int LAYOUT_NO_START_CONTEXTA flag to layoutGlyphVector indicating that text in the char array before the indicated start should not be examined.- See Also:
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LAYOUT_NO_LIMIT_CONTEXT
public static final int LAYOUT_NO_LIMIT_CONTEXTA flag to layoutGlyphVector indicating that text in the char array after the indicated limit should not be examined.- See Also:
-
-
Constructor Details
-
Font
Creates a newFont
from the specified name, style and point size.The font name can be a font face name or a font family name. It is used together with the style to find an appropriate font face. When a font family name is specified, the style argument is used to select the most appropriate face from the family. When a font face name is specified, the face's style and the style argument are merged to locate the best matching font from the same family. For example if face name "Arial Bold" is specified with style
Font.ITALIC
, the font system looks for a face in the "Arial" family that is bold and italic, and may associate the font instance with the physical font face "Arial Bold Italic". The style argument is merged with the specified face's style, not added or subtracted. This means, specifying a bold face and a bold style does not double-embolden the font, and specifying a bold face and a plain style does not lighten the font.If no face for the requested style can be found, the font system may apply algorithmic styling to achieve the desired style. For example, if
ITALIC
is requested, but no italic face is available, glyphs from the plain face may be algorithmically obliqued (slanted).Font name lookup is case insensitive, using the case folding rules of the US locale.
If the
name
parameter represents something other than a logical font, i.e. is interpreted as a physical font face or family, and this cannot be mapped by the implementation to a physical font or a compatible alternative, then the font system will map the Font instance to "Dialog", such that for example, the family as reported bygetFamily
will be "Dialog".- Parameters:
name
- the font name. This can be a font face name or a font family name, and may represent either a logical font or a physical font found in thisGraphicsEnvironment
. The family names for logical fonts are: Dialog, DialogInput, Monospaced, Serif, or SansSerif. Pre-defined String constants exist for all of these names, for example,DIALOG
. Ifname
isnull
, the logical font name of the newFont
as returned bygetName()
is set to the name "Default".style
- the style constant for theFont
The style argument is an integer bitmask that may bePLAIN
, or a bitwise union ofBOLD
and/orITALIC
(for example,ITALIC
orBOLD|ITALIC
). If the style argument does not conform to one of the expected integer bitmasks then the style is set toPLAIN
.size
- the point size of theFont
- Since:
- 1.0
- See Also:
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Font
Creates a newFont
with the specified attributes. Only keys defined inTextAttribute
are recognized. In addition the FONT attribute is not recognized by this constructor (seegetAvailableAttributes()
). Only attributes that have values of valid types will affect the newFont
.If
attributes
isnull
, a newFont
is initialized with default values.- Parameters:
attributes
- the attributes to assign to the newFont
, ornull
- See Also:
-
Font
Creates a newFont
from the specifiedfont
. This constructor is intended for use by subclasses.- Parameters:
font
- from which to create thisFont
.- Throws:
NullPointerException
- iffont
is null- Since:
- 1.6
-
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Method Details
-
textRequiresLayout
public static boolean textRequiresLayout(char[] chars, int start, int end) Returns true if any part of the specified text is from a complex script for which the implementation will need to invoke layout processing in order to render correctly when usingdrawString(String,int,int)
and other text rendering methods. Measurement of the text may similarly need the same extra processing. Thestart
andend
indices are provided so that the application can request only a subset of the text be considered. The last char index examined is at"end-1"
, i.e a request to examine the entire array would beFont.textRequiresLayout(chars, 0, chars.length);
Note that even if this method returns
false
, layout processing may still be invoked when used with anyFont
for whichhasLayoutAttributes()
returnstrue
, so that method will need to be consulted for the specific font, in order to obtain an answer which accounts for such font attributes.- Parameters:
chars
- the text.start
- the index of the first char to examine.end
- the ending index, exclusive.- Returns:
true
if the specified text will need special layout.- Throws:
NullPointerException
- ifchars
is null.ArrayIndexOutOfBoundsException
- ifstart
is negative orend
is greater than the length of thechars
array.- Since:
- 9
-
getFont
Returns aFont
appropriate to the attributes. Ifattributes
contains aFONT
attribute with a validFont
as its value, it will be merged with any remaining attributes. SeeTextAttribute.FONT
for more information.- Parameters:
attributes
- the attributes to assign to the newFont
- Returns:
- a new
Font
created with the specified attributes - Throws:
NullPointerException
- ifattributes
is null.- Since:
- 1.2
- See Also:
-
createFonts
Returns a new array ofFont
decoded from the specified stream. The returnedFont[]
will have at least one element.The explicit purpose of this variation on the
createFont(int, InputStream)
method is to support font sources which represent a TrueType/OpenType font collection and be able to return all individual fonts in that collection. Consequently this method will throwFontFormatException
if the data source does not contain at least one TrueType/OpenType font. The same exception will also be thrown if any of the fonts in the collection does not contain the required font tables.The condition "at least one", allows for the stream to represent a single OpenType/TrueType font. That is, it does not have to be a collection. Each
Font
element of the returned array is created with a point size of 1 and stylePLAIN
. This base font can then be used with thederiveFont
methods in this class to derive newFont
objects with varying sizes, styles, transforms and font features.This method does not close the
InputStream
.To make each
Font
available to Font constructors it must be registered in theGraphicsEnvironment
by callingregisterFont(Font)
.- Parameters:
fontStream
- anInputStream
object representing the input data for the font or font collection.- Returns:
- a new
Font[]
. - Throws:
FontFormatException
- if thefontStream
data does not contain the required font tables for any of the elements of the collection, or if it contains no fonts at all.IOException
- if thefontStream
cannot be completely read.- Since:
- 9
- See Also:
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createFonts
Returns a new array ofFont
decoded from the specified file. The returnedFont[]
will have at least one element.The explicit purpose of this variation on the
createFont(int, File)
method is to support font sources which represent a TrueType/OpenType font collection and be able to return all individual fonts in that collection. Consequently this method will throwFontFormatException
if the data source does not contain at least one TrueType/OpenType font. The same exception will also be thrown if any of the fonts in the collection does not contain the required font tables.The condition "at least one", allows for the stream to represent a single OpenType/TrueType font. That is, it does not have to be a collection. Each
Font
element of the returned array is created with a point size of 1 and stylePLAIN
. This base font can then be used with thederiveFont
methods in this class to derive newFont
objects with varying sizes, styles, transforms and font features.To make each
Font
available to Font constructors it must be registered in theGraphicsEnvironment
by callingregisterFont(Font)
.- Parameters:
fontFile
- aFile
object containing the input data for the font or font collection.- Returns:
- a new
Font[]
. - Throws:
FontFormatException
- if theFile
does not contain the required font tables for any of the elements of the collection, or if it contains no fonts at all.IOException
- if thefontFile
cannot be read.- Since:
- 9
- See Also:
-
createFont
public static Font createFont(int fontFormat, InputStream fontStream) throws FontFormatException, IOException Returns a newFont
using the specified font type and input data. The newFont
is created with a point size of 1 and stylePLAIN
. This base font can then be used with thederiveFont
methods in this class to derive newFont
objects with varying sizes, styles, transforms and font features. This method does not close theInputStream
.To make the
Font
available to Font constructors the returnedFont
must be registered in theGraphicsEnvironment
by callingregisterFont(Font)
.- Parameters:
fontFormat
- the type of theFont
, which isTRUETYPE_FONT
if a TrueType resource is specified. orTYPE1_FONT
if a Type 1 resource is specified.fontStream
- anInputStream
object representing the input data for the font.- Returns:
- a new
Font
created with the specified font type. - Throws:
IllegalArgumentException
- iffontFormat
is notTRUETYPE_FONT
orTYPE1_FONT
.FontFormatException
- if thefontStream
data does not contain the required font tables for the specified format.IOException
- if thefontStream
cannot be completely read.- Since:
- 1.3
- See Also:
-
createFont
public static Font createFont(int fontFormat, File fontFile) throws FontFormatException, IOException Returns a newFont
using the specified font type and the specified font file. The newFont
is created with a point size of 1 and stylePLAIN
. This base font can then be used with thederiveFont
methods in this class to derive newFont
objects with varying sizes, styles, transforms and font features.- Parameters:
fontFormat
- the type of theFont
, which isTRUETYPE_FONT
if a TrueType resource is specified orTYPE1_FONT
if a Type 1 resource is specified. So long as the returned font, or its derived fonts are referenced the implementation may continue to accessfontFile
to retrieve font data. Thus the results are undefined if the file is changed, or becomes inaccessible.To make the
Font
available to Font constructors the returnedFont
must be registered in theGraphicsEnvironment
by callingregisterFont(Font)
.fontFile
- aFile
object representing the input data for the font.- Returns:
- a new
Font
created with the specified font type. - Throws:
IllegalArgumentException
- iffontFormat
is notTRUETYPE_FONT
orTYPE1_FONT
.NullPointerException
- iffontFile
is null.IOException
- if thefontFile
cannot be read.FontFormatException
- iffontFile
does not contain the required font tables for the specified format.- Since:
- 1.5
- See Also:
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getTransform
Returns a copy of the transform associated with thisFont
. This transform is not necessarily the one used to construct the font. If the font has algorithmic superscripting or width adjustment, this will be incorporated into the returnedAffineTransform
.Typically, fonts will not be transformed. Clients generally should call
isTransformed()
first, and only call this method ifisTransformed
returns true.- Returns:
- an
AffineTransform
object representing the transform attribute of thisFont
object.
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getFamily
Returns the family name of thisFont
.The family name of a font is font specific. Two fonts such as Helvetica Italic and Helvetica Bold have the same family name, Helvetica, whereas their font face names are Helvetica Bold and Helvetica Italic. The list of available family names may be obtained by using the
GraphicsEnvironment.getAvailableFontFamilyNames()
method.Use
getName
to get the logical name of the font. UsegetFontName
to get the font face name of the font.- Returns:
- a
String
that is the family name of thisFont
. - Since:
- 1.1
- See Also:
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getFamily
Returns the family name of thisFont
, localized for the specified locale.The family name of a font is font specific. Two fonts such as Helvetica Italic and Helvetica Bold have the same family name, Helvetica, whereas their font face names are Helvetica Bold and Helvetica Italic. The list of available family names may be obtained by using the
GraphicsEnvironment.getAvailableFontFamilyNames()
method.Use
getFontName
to get the font face name of the font.- Parameters:
l
- locale for which to get the family name- Returns:
- a
String
representing the family name of the font, localized for the specified locale. - Since:
- 1.2
- See Also:
-
getPSName
Returns the postscript name of thisFont
. UsegetFamily
to get the family name of the font. UsegetFontName
to get the font face name of the font.- Returns:
- a
String
representing the postscript name of thisFont
. - Since:
- 1.2
-
getName
Returns the logical name of thisFont
. UsegetFamily
to get the family name of the font. UsegetFontName
to get the font face name of the font.- Returns:
- a
String
representing the logical name of thisFont
. - Since:
- 1.0
- See Also:
-
getFontName
Returns the font face name of thisFont
. For example, Helvetica Bold could be returned as a font face name. UsegetFamily
to get the family name of the font. UsegetName
to get the logical name of the font.- Returns:
- a
String
representing the font face name of thisFont
. - Since:
- 1.2
- See Also:
-
getFontName
Returns the font face name of theFont
, localized for the specified locale. For example, Helvetica Fett could be returned as the font face name. UsegetFamily
to get the family name of the font.- Parameters:
l
- a locale for which to get the font face name- Returns:
- a
String
representing the font face name, localized for the specified locale. - See Also:
-
getStyle
public int getStyle()Returns the style of thisFont
. The style can be PLAIN, BOLD, ITALIC, or BOLD+ITALIC.- Returns:
- the style of this
Font
- Since:
- 1.0
- See Also:
-
getSize
public int getSize()Returns the point size of thisFont
, rounded to an integer. Most users are familiar with the idea of using point size to specify the size of glyphs in a font. This point size defines a measurement between the baseline of one line to the baseline of the following line in a single spaced text document. The point size is based on typographic points, approximately 1/72 of an inch.The Java(tm)2D API adopts the convention that one point is equivalent to one unit in user coordinates. When using a normalized transform for converting user space coordinates to device space coordinates 72 user space units equal 1 inch in device space. In this case one point is 1/72 of an inch.
- Returns:
- the point size of this
Font
in 1/72 of an inch units. - Since:
- 1.0
- See Also:
-
getSize2D
public float getSize2D()Returns the point size of thisFont
infloat
value.- Returns:
- the point size of this
Font
as afloat
value. - Since:
- 1.2
- See Also:
-
isPlain
public boolean isPlain()Indicates whether or not thisFont
object's style is PLAIN.- Returns:
true
if thisFont
has a PLAIN style;false
otherwise.- Since:
- 1.0
- See Also:
-
isBold
public boolean isBold()Indicates whether or not thisFont
object's style is BOLD.- Returns:
true
if thisFont
object's style is BOLD;false
otherwise.- Since:
- 1.0
- See Also:
-
isItalic
public boolean isItalic()Indicates whether or not thisFont
object's style is ITALIC.- Returns:
true
if thisFont
object's style is ITALIC;false
otherwise.- Since:
- 1.0
- See Also:
-
isTransformed
public boolean isTransformed()Indicates whether or not thisFont
object has a transform that affects its size in addition to the Size attribute.- Returns:
true
if thisFont
object has a non-identity AffineTransform attribute.false
otherwise.- Since:
- 1.4
- See Also:
-
hasLayoutAttributes
public boolean hasLayoutAttributes()Return true if this Font contains attributes that require extra layout processing.- Returns:
- true if the font has layout attributes
- Since:
- 1.6
-
getFont
Returns aFont
object from the system properties list.nm
is treated as the name of a system property to be obtained. TheString
value of this property is then interpreted as aFont
object according to the specification ofFont.decode(String)
If the specified property is not found, null is returned instead.- Parameters:
nm
- the property name- Returns:
- a
Font
object that the property name describes, or null if no such property exists. - Throws:
NullPointerException
- if nm is null.- Since:
- 1.2
- See Also:
-
decode
Returns theFont
that thestr
argument describes. To ensure that this method returns the desired Font, format thestr
parameter in one of these ways- fontname-style-pointsize
- fontname-pointsize
- fontname-style
- fontname
- fontname style pointsize
- fontname pointsize
- fontname style
- fontname
"PLAIN"
,"BOLD"
,"BOLDITALIC"
, or"ITALIC"
, and pointsize is a positive decimal integer representation of the point size. For example, if you want a font that is Arial, bold, with a point size of 18, you would call this method with: "Arial-BOLD-18". This is equivalent to calling the Font constructor :new Font("Arial", Font.BOLD, 18);
and the values are interpreted as specified by that constructor.A valid trailing decimal field is always interpreted as the pointsize. Therefore a fontname containing a trailing decimal value should not be used in the fontname only form.
If a style name field is not one of the valid style strings, it is interpreted as part of the font name, and the default style is used.
Only one of ' ' or '-' may be used to separate fields in the input. The identified separator is the one closest to the end of the string which separates a valid pointsize, or a valid style name from the rest of the string. Null (empty) pointsize and style fields are treated as valid fields with the default value for that field.
Some font names may include the separator characters ' ' or '-'. If
str
is not formed with 3 components, e.g. such thatstyle
orpointsize
fields are not present instr
, andfontname
also contains a character determined to be the separator character then these characters where they appear as intended to be part offontname
may instead be interpreted as separators so the font name may not be properly recognised.The default size is 12 and the default style is PLAIN. If
str
does not specify a valid size, the returnedFont
has a size of 12. Ifstr
does not specify a valid style, the returned Font has a style of PLAIN. If you do not specify a valid font name in thestr
argument, this method will return a font with the family name "Dialog". To determine what font family names are available on your system, use theGraphicsEnvironment.getAvailableFontFamilyNames()
method. Ifstr
isnull
, a newFont
is returned with the family name "Dialog", a size of 12 and a PLAIN style.- Parameters:
str
- the name of the font, ornull
- Returns:
- the
Font
object thatstr
describes, or a new defaultFont
ifstr
isnull
. - Since:
- 1.1
- See Also:
-
getFont
Gets the specifiedFont
from the system properties list. As in thegetProperty
method ofSystem
, the first argument is treated as the name of a system property to be obtained. TheString
value of this property is then interpreted as aFont
object.The property value should be one of the forms accepted by
Font.decode(String)
If the specified property is not found, thefont
argument is returned instead.- Parameters:
nm
- the case-insensitive property namefont
- a defaultFont
to return if propertynm
is not defined- Returns:
- the
Font
value of the property. - Throws:
NullPointerException
- if nm is null.- See Also:
-
hashCode
-
equals
Compares thisFont
object to the specifiedObject
. -
toString
-
getNumGlyphs
public int getNumGlyphs()Returns the number of glyphs in thisFont
. Glyph codes for thisFont
range from 0 togetNumGlyphs()
- 1.- Returns:
- the number of glyphs in this
Font
. - Since:
- 1.2
-
getMissingGlyphCode
public int getMissingGlyphCode()Returns the glyphCode which is used when thisFont
does not have a glyph for a specified unicode code point.- Returns:
- the glyphCode of this
Font
. - Since:
- 1.2
-
getBaselineFor
public byte getBaselineFor(char c) Returns the baseline appropriate for displaying this character.Large fonts can support different writing systems, and each system can use a different baseline. The character argument determines the writing system to use. Clients should not assume all characters use the same baseline.
- Parameters:
c
- a character used to identify the writing system- Returns:
- the baseline appropriate for the specified character.
- Since:
- 1.2
- See Also:
-
getAttributes
Returns a map of font attributes available in thisFont
. Attributes include things like ligatures and glyph substitution.- Returns:
- the attributes map of this
Font
.
-
getAvailableAttributes
Returns the keys of all the attributes supported by thisFont
. These attributes can be used to derive other fonts.- Returns:
- an array containing the keys of all the attributes
supported by this
Font
. - Since:
- 1.2
-
deriveFont
Creates a newFont
object by replicating thisFont
object and applying a new style and size.- Parameters:
style
- the style for the newFont
size
- the size for the newFont
- Returns:
- a new
Font
object. - Since:
- 1.2
-
deriveFont
Creates a newFont
object by replicating thisFont
object and applying a new style and transform.- Parameters:
style
- the style for the newFont
trans
- theAffineTransform
associated with the newFont
- Returns:
- a new
Font
object. - Throws:
IllegalArgumentException
- iftrans
isnull
- Since:
- 1.2
-
deriveFont
Creates a newFont
object by replicating the currentFont
object and applying a new size to it.- Parameters:
size
- the size for the newFont
.- Returns:
- a new
Font
object. - Since:
- 1.2
-
deriveFont
Creates a newFont
object by replicating the currentFont
object and applying a new transform to it.- Parameters:
trans
- theAffineTransform
associated with the newFont
- Returns:
- a new
Font
object. - Throws:
IllegalArgumentException
- iftrans
isnull
- Since:
- 1.2
-
deriveFont
Creates a newFont
object by replicating the currentFont
object and applying a new style to it.- Parameters:
style
- the style for the newFont
- Returns:
- a new
Font
object. - Since:
- 1.2
-
deriveFont
Creates a newFont
object by replicating the currentFont
object and applying a new set of font attributes to it.- Parameters:
attributes
- a map of attributes enabled for the newFont
- Returns:
- a new
Font
object. - Since:
- 1.2
-
canDisplay
public boolean canDisplay(char c) Checks if thisFont
has a glyph for the specified character.Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use the
canDisplay(int)
method orcanDisplayUpTo
methods.- Parameters:
c
- the character for which a glyph is needed- Returns:
true
if thisFont
has a glyph for this character;false
otherwise.- Since:
- 1.2
-
canDisplay
public boolean canDisplay(int codePoint) Checks if thisFont
has a glyph for the specified character.- Parameters:
codePoint
- the character (Unicode code point) for which a glyph is needed.- Returns:
true
if thisFont
has a glyph for the character;false
otherwise.- Throws:
IllegalArgumentException
- if the code point is not a valid Unicode code point.- Since:
- 1.5
- See Also:
-
canDisplayUpTo
Indicates whether or not thisFont
can display a specifiedString
. For strings with Unicode encoding, it is important to know if a particular font can display the string. This method returns an offset into theString
str
which is the first character thisFont
cannot display without using the missing glyph code. If theFont
can display all characters, -1 is returned.- Parameters:
str
- aString
object- Returns:
- an offset into
str
that points to the first character instr
that thisFont
cannot display; or-1
if thisFont
can display all characters instr
. - Since:
- 1.2
-
canDisplayUpTo
public int canDisplayUpTo(char[] text, int start, int limit) Indicates whether or not thisFont
can display the characters in the specifiedtext
starting atstart
and ending atlimit
. This method is a convenience overload.- Parameters:
text
- the specified array ofchar
valuesstart
- the specified starting offset (inchar
s) into the specified array ofchar
valueslimit
- the specified ending offset (inchar
s) into the specified array ofchar
values- Returns:
- an offset into
text
that points to the first character intext
that thisFont
cannot display; or-1
if thisFont
can display all characters intext
. - Since:
- 1.2
-
canDisplayUpTo
Indicates whether or not thisFont
can display the text specified by theiter
starting atstart
and ending atlimit
.- Parameters:
iter
- aCharacterIterator
objectstart
- the specified starting offset into the specifiedCharacterIterator
.limit
- the specified ending offset into the specifiedCharacterIterator
.- Returns:
- an offset into
iter
that points to the first character initer
that thisFont
cannot display; or-1
if thisFont
can display all characters initer
. - Since:
- 1.2
-
getItalicAngle
public float getItalicAngle()Returns the italic angle of thisFont
. The italic angle is the inverse slope of the caret which best matches the posture of thisFont
.- Returns:
- the angle of the ITALIC style of this
Font
. - See Also:
-
hasUniformLineMetrics
public boolean hasUniformLineMetrics()Checks whether or not thisFont
has uniform line metrics. A logicalFont
might be a composite font, which means that it is composed of different physical fonts to cover different code ranges. Each of these fonts might have differentLineMetrics
. If the logicalFont
is a single font then the metrics would be uniform.- Returns:
true
if thisFont
has uniform line metrics;false
otherwise.
-
getLineMetrics
- Parameters:
str
- the specifiedString
frc
- the specifiedFontRenderContext
- Returns:
- a
LineMetrics
object created with the specifiedString
andFontRenderContext
.
-
getLineMetrics
Returns aLineMetrics
object created with the specified arguments.- Parameters:
str
- the specifiedString
beginIndex
- the initial offset ofstr
limit
- the end offset ofstr
frc
- the specifiedFontRenderContext
- Returns:
- a
LineMetrics
object created with the specified arguments.
-
getLineMetrics
Returns aLineMetrics
object created with the specified arguments.- Parameters:
chars
- an array of charactersbeginIndex
- the initial offset ofchars
limit
- the end offset ofchars
frc
- the specifiedFontRenderContext
- Returns:
- a
LineMetrics
object created with the specified arguments.
-
getLineMetrics
public LineMetrics getLineMetrics(CharacterIterator ci, int beginIndex, int limit, FontRenderContext frc) Returns aLineMetrics
object created with the specified arguments.- Parameters:
ci
- the specifiedCharacterIterator
beginIndex
- the initial offset inci
limit
- the end offset ofci
frc
- the specifiedFontRenderContext
- Returns:
- a
LineMetrics
object created with the specified arguments.
-
getStringBounds
Returns the logical bounds of the specifiedString
in the specifiedFontRenderContext
. The logical bounds contains the origin, ascent, advance, and height, which includes the leading. The logical bounds does not always enclose all the text. For example, in some languages and in some fonts, accent marks can be positioned above the ascent or below the descent. To obtain a visual bounding box, which encloses all the text, use thegetBounds
method ofTextLayout
.Note: The returned bounds is in baseline-relative coordinates (see
class notes
).- Parameters:
str
- the specifiedString
frc
- the specifiedFontRenderContext
- Returns:
- a
Rectangle2D
that is the bounding box of the specifiedString
in the specifiedFontRenderContext
. - Since:
- 1.2
- See Also:
-
getStringBounds
Returns the logical bounds of the specifiedString
in the specifiedFontRenderContext
. The logical bounds contains the origin, ascent, advance, and height, which includes the leading. The logical bounds does not always enclose all the text. For example, in some languages and in some fonts, accent marks can be positioned above the ascent or below the descent. To obtain a visual bounding box, which encloses all the text, use thegetBounds
method ofTextLayout
.Note: The returned bounds is in baseline-relative coordinates (see
class notes
).- Parameters:
str
- the specifiedString
beginIndex
- the initial offset ofstr
limit
- the end offset ofstr
frc
- the specifiedFontRenderContext
- Returns:
- a
Rectangle2D
that is the bounding box of the specifiedString
in the specifiedFontRenderContext
. - Throws:
IndexOutOfBoundsException
- ifbeginIndex
is less than zero, orlimit
is greater than the length ofstr
, orbeginIndex
is greater thanlimit
.- Since:
- 1.2
- See Also:
-
getStringBounds
Returns the logical bounds of the specified array of characters in the specifiedFontRenderContext
. The logical bounds contains the origin, ascent, advance, and height, which includes the leading. The logical bounds does not always enclose all the text. For example, in some languages and in some fonts, accent marks can be positioned above the ascent or below the descent. To obtain a visual bounding box, which encloses all the text, use thegetBounds
method ofTextLayout
.Note: The returned bounds is in baseline-relative coordinates (see
class notes
).- Parameters:
chars
- an array of charactersbeginIndex
- the initial offset in the array of characterslimit
- the end offset in the array of charactersfrc
- the specifiedFontRenderContext
- Returns:
- a
Rectangle2D
that is the bounding box of the specified array of characters in the specifiedFontRenderContext
. - Throws:
IndexOutOfBoundsException
- ifbeginIndex
is less than zero, orlimit
is greater than the length ofchars
, orbeginIndex
is greater thanlimit
.- Since:
- 1.2
- See Also:
-
getStringBounds
public Rectangle2D getStringBounds(CharacterIterator ci, int beginIndex, int limit, FontRenderContext frc) Returns the logical bounds of the characters indexed in the specifiedCharacterIterator
in the specifiedFontRenderContext
. The logical bounds contains the origin, ascent, advance, and height, which includes the leading. The logical bounds does not always enclose all the text. For example, in some languages and in some fonts, accent marks can be positioned above the ascent or below the descent. To obtain a visual bounding box, which encloses all the text, use thegetBounds
method ofTextLayout
.Note: The returned bounds is in baseline-relative coordinates (see
class notes
).- Parameters:
ci
- the specifiedCharacterIterator
beginIndex
- the initial offset inci
limit
- the end offset inci
frc
- the specifiedFontRenderContext
- Returns:
- a
Rectangle2D
that is the bounding box of the characters indexed in the specifiedCharacterIterator
in the specifiedFontRenderContext
. - Throws:
IndexOutOfBoundsException
- ifbeginIndex
is less than the start index ofci
, orlimit
is greater than the end index ofci
, orbeginIndex
is greater thanlimit
- Since:
- 1.2
- See Also:
-
getMaxCharBounds
Returns the bounds for the character with the maximum bounds as defined in the specifiedFontRenderContext
.Note: The returned bounds is in baseline-relative coordinates (see
class notes
).- Parameters:
frc
- the specifiedFontRenderContext
- Returns:
- a
Rectangle2D
that is the bounding box for the character with the maximum bounds.
-
createGlyphVector
Creates aGlyphVector
by mapping characters to glyphs one-to-one based on the Unicode cmap in thisFont
. This method does no other processing besides the mapping of glyphs to characters. This means that this method is not useful for some scripts, such as Arabic, Hebrew, Thai, and Indic, that require reordering, shaping, or ligature substitution.- Parameters:
frc
- the specifiedFontRenderContext
str
- the specifiedString
- Returns:
- a new
GlyphVector
created with the specifiedString
and the specifiedFontRenderContext
.
-
createGlyphVector
Creates aGlyphVector
by mapping characters to glyphs one-to-one based on the Unicode cmap in thisFont
. This method does no other processing besides the mapping of glyphs to characters. This means that this method is not useful for some scripts, such as Arabic, Hebrew, Thai, and Indic, that require reordering, shaping, or ligature substitution.- Parameters:
frc
- the specifiedFontRenderContext
chars
- the specified array of characters- Returns:
- a new
GlyphVector
created with the specified array of characters and the specifiedFontRenderContext
.
-
createGlyphVector
Creates aGlyphVector
by mapping the specified characters to glyphs one-to-one based on the Unicode cmap in thisFont
. This method does no other processing besides the mapping of glyphs to characters. This means that this method is not useful for some scripts, such as Arabic, Hebrew, Thai, and Indic, that require reordering, shaping, or ligature substitution.- Parameters:
frc
- the specifiedFontRenderContext
ci
- the specifiedCharacterIterator
- Returns:
- a new
GlyphVector
created with the specifiedCharacterIterator
and the specifiedFontRenderContext
.
-
createGlyphVector
Creates aGlyphVector
by mapping characters to glyphs one-to-one based on the Unicode cmap in thisFont
. This method does no other processing besides the mapping of glyphs to characters. This means that this method is not useful for some scripts, such as Arabic, Hebrew, Thai, and Indic, that require reordering, shaping, or ligature substitution.- Parameters:
frc
- the specifiedFontRenderContext
glyphCodes
- the specified integer array- Returns:
- a new
GlyphVector
created with the specified integer array and the specifiedFontRenderContext
.
-
layoutGlyphVector
public GlyphVector layoutGlyphVector(FontRenderContext frc, char[] text, int start, int limit, int flags) Returns a newGlyphVector
object, performing full layout of the text if possible. Full layout is required for complex text, such as Arabic or Hindi. Support for different scripts depends on the font and implementation.Layout requires bidi analysis, as performed by
Bidi
, and should only be performed on text that has a uniform direction. The direction is indicated in the flags parameter,by using LAYOUT_RIGHT_TO_LEFT to indicate a right-to-left (Arabic and Hebrew) run direction, or LAYOUT_LEFT_TO_RIGHT to indicate a left-to-right (English) run direction.In addition, some operations, such as Arabic shaping, require context, so that the characters at the start and limit can have the proper shapes. Sometimes the data in the buffer outside the provided range does not have valid data. The values LAYOUT_NO_START_CONTEXT and LAYOUT_NO_LIMIT_CONTEXT can be added to the flags parameter to indicate that the text before start, or after limit, respectively, should not be examined for context.
All other values for the flags parameter are reserved.
- Parameters:
frc
- the specifiedFontRenderContext
text
- the text to layoutstart
- the start of the text to use for theGlyphVector
limit
- the limit of the text to use for theGlyphVector
flags
- control flags as described above- Returns:
- a new
GlyphVector
representing the text between start and limit, with glyphs chosen and positioned so as to best represent the text - Throws:
ArrayIndexOutOfBoundsException
- if start or limit is out of bounds- Since:
- 1.4
- See Also:
-