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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class GlyphVector - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.awt.font
Class GlyphVector

java.lang.Object
  |
  +--java.awt.font.GlyphVector

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public abstract class GlyphVector

extends Object

implements Cloneable

A GlyphVector object is a collection of glyphs containing geometric information for the placement of each glyph in a transformed coordinate space which corresponds to the device on which the GlyphVector is ultimately displayed.

The GlyphVector does not attempt any interpretation of the sequence of glyphs it contains. Relationships between adjacent glyphs in sequence are solely used to determine the placement of the glyphs in the visual coordinate space.

Instances of GlyphVector are created by a Font.

In a text processing application that can cache intermediate representations of text, creation and subsequent caching of a GlyphVector for use during rendering is the fastest method to present the visual representation of characters to a user.

A GlyphVector is associated with exactly one Font, and can provide data useful only in relation to this Font. In addition, metrics obtained from a GlyphVector are not generally geometrically scaleable since the pixelization and spacing are dependent on grid-fitting algorithms within a Font. To facilitate accurate measurement of a GlyphVector and its component glyphs, you must specify a scaling transform, anti-alias mode, and fractional metrics mode when creating the GlyphVector. These characteristics can be derived from the destination device.

For each glyph in the GlyphVector, you can obtain:

• the position of the glyph
• the transform associated with the glyph
• the metrics of the glyph in the context of the GlyphVector. The metrics of the glyph may be different under different transforms, application specified rendering hints, and the specific instance of the glyph within the GlyphVector.

Altering the data used to create the GlyphVector does not alter the state of the GlyphVector.

Methods are provided to create new GlyphVector objects which are the result of editing operations on the GlyphVector, such as glyph insertion and deletion. These methods are most appropriate for applications that are forming combinations such as ligatures from existing glyphs or are breaking such combinations into their component parts for visual presentation.

Methods are provided to create new GlyphVector objects that are the result of specifying new positions for the glyphs within the GlyphVector. These methods are most appropriate for applications that are performing justification operations for the presentation of the glyphs.

Methods are provided to return both the visual and logical bounds of the entire GlyphVector or of individual glyphs within the GlyphVector.

Methods are provided to return a Shape for the GlyphVector, and for individual glyphs within the GlyphVector.

See Also:

Font, GlyphMetrics, TextLayout

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Constructor Summary

GlyphVector()

 

Method Summary
abstract  boolean	equals(GlyphVector set)           Tests if the specified GlyphVector exactly equals this GlyphVector.
abstract  Font	getFont()           Returns the Font associated with this GlyphVector.
abstract  FontRenderContext	getFontRenderContext()           Returns the FontRenderContext associated with this GlyphVector.
abstract  int	getGlyphCode(int glyphIndex)           Returns the glyphcode of the specified glyph.
abstract  int[]	getGlyphCodes(int beginGlyphIndex, int numEntries, int[] codeReturn)           Returns an array of glyphcodes for the specified glyphs.
abstract  GlyphJustificationInfo	getGlyphJustificationInfo(int glyphIndex)           Returns the justification information for the glyph at the specified index into this GlyphVector.
abstract  Shape	getGlyphLogicalBounds(int glyphIndex)           Returns the logical bounds of the specified glyph within this GlyphVector.
abstract  GlyphMetrics	getGlyphMetrics(int glyphIndex)           Returns the metrics of the glyph at the specified index into this GlyphVector.
abstract  Shape	getGlyphOutline(int glyphIndex)           Returns a Shape whose interior corresponds to the visual representation of the specified glyph within this GlyphVector.
abstract  Point2D	getGlyphPosition(int glyphIndex)           Returns the position of the specified glyph within this GlyphVector.
abstract  float[]	getGlyphPositions(int beginGlyphIndex, int numEntries, float[] positionReturn)           Returns an array of glyph positions for the specified glyphs.
abstract  AffineTransform	getGlyphTransform(int glyphIndex)           Gets the transform of the specified glyph within this GlyphVector.
abstract  Shape	getGlyphVisualBounds(int glyphIndex)           Returns the visual bounds of the specified glyph within the GlyphVector.
abstract  Rectangle2D	getLogicalBounds()           Returns the logical bounds of this GlyphVector.
abstract  int	getNumGlyphs()           Returns the number of glyphs in this GlyphVector.
abstract  Shape	getOutline()           Returns a Shape whose interior corresponds to the visual representation of this GlyphVector.
abstract  Shape	getOutline(float x, float y)           Returns a Shape whose interior corresponds to the visual representation of this GlyphVector, offset to x, y.
abstract  Rectangle2D	getVisualBounds()           Returns the visual bounds of this GlyphVector The visual bounds is the tightest rectangle enclosing all non-background pixels in the rendered representation of this GlyphVector.
abstract  void	performDefaultLayout()           Assigns default positions to each glyph in this GlyphVector.
abstract  void	setGlyphPosition(int glyphIndex, Point2D newPos)           Sets the position of the specified glyph within this GlyphVector.
abstract  void	setGlyphTransform(int glyphIndex, AffineTransform newTX)           Sets the transform of the specified glyph within this GlyphVector.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

GlyphVector

public GlyphVector()

Method Detail

getFont

public abstract Font getFont()

Returns the Font associated with this GlyphVector.

See Also:

Font

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getFontRenderContext

public abstract FontRenderContext getFontRenderContext()

Returns the FontRenderContext associated with this GlyphVector.

Returns:

FontRenderContext used to create this GlyphVector.

See Also:

FontRenderContext, Font

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performDefaultLayout

public abstract void performDefaultLayout()

Assigns default positions to each glyph in this GlyphVector. No shaping, reordering, or contextual substitution is performed.

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getNumGlyphs

public abstract int getNumGlyphs()

Returns the number of glyphs in this GlyphVector. This information is used to create arrays that are to be filled with results of other information retrieval operations.

Returns:

number of glyphs in this GlyphVector.

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getGlyphCode

public abstract int getGlyphCode(int glyphIndex)

Returns the glyphcode of the specified glyph. This return value is meaningless to anything other than a Font object and can be used to ask the Font object about the existence of ligatures and other context sensitive information.

Parameters:

glyphIndex - the index into this GlyphVector that corresponds to the glyph from which to retrieve the glyphcode.

Returns:

the glyphcode of the glyph corresponding the the specified glyphIndex.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

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getGlyphCodes

public abstract int[] getGlyphCodes(int beginGlyphIndex,
                                    int numEntries,
                                    int[] codeReturn)

Returns an array of glyphcodes for the specified glyphs. The contents of this return value are meaningless to anything other than a Font and can be used to ask the Font about the existence of ligatures and other context sensitive information. This method is used for convenience and performance when processing glyphcodes. If no array is passed in, an array is created.

Parameters:

beginGlyphIndex - the index into this GlyphVector at which to start retrieving glyphcodes for the corresponding glyphs

numEntries - the offset from beginGlyphIndex at which to stop retrieving glyphcodes

codeReturn - the array that receives the glyphcodes and is then returned

Returns:

an array of glyphcodes for the specified glyphs.

Throws:

IllegalArgumentException - if numEntries is less than 0

IndexOutOfBoundsException - if beginGlyphIndex is less than 0

IndexOutOfBoundsException - if the sum of beginGlyphIndex and numEntries is greater than the number of glyphs in this GlyphVector

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getLogicalBounds

public abstract Rectangle2D getLogicalBounds()

Returns the logical bounds of this GlyphVector. This method is used when positioning this GlyphVector in relation to visually adjacent GlyphVector objects.

Returns:

a Rectangle2D that is the logical bounds of this GlyphVector.

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getVisualBounds

public abstract Rectangle2D getVisualBounds()

Returns the visual bounds of this GlyphVector The visual bounds is the tightest rectangle enclosing all non-background pixels in the rendered representation of this GlyphVector.

Returns:

a Rectangle2D that is the tightest bounds of this GlyphVector.

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getOutline

public abstract Shape getOutline()

Returns a Shape whose interior corresponds to the visual representation of this GlyphVector.

Returns:

a Shape that is the outline of this GlyphVector.

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getOutline

public abstract Shape getOutline(float x,
                                 float y)

Returns a Shape whose interior corresponds to the visual representation of this GlyphVector, offset to x, y.

Parameters:

x, y - the coordinates of the location of the outline Shape

Returns:

a Shape that is the outline of this GlyphVector, offset to the specified coordinates.

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getGlyphOutline

public abstract Shape getGlyphOutline(int glyphIndex)

Returns a Shape whose interior corresponds to the visual representation of the specified glyph within this GlyphVector.

Parameters:

glyphIndex - the index into this GlyphVector

Returns:

a Shape that is the outline of the glyph at the specified glyphIndex of this GlyphVector.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

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getGlyphPosition

public abstract Point2D getGlyphPosition(int glyphIndex)

Returns the position of the specified glyph within this GlyphVector. This position corresponds to the leading edge of the baseline for the glyph. If glyphIndex equals the number of of glyphs in this GlyphVector, this method gets the position after the last glyph and this position is used to define the advance of the entire GlyphVector.

Parameters:

glyphIndex - the index into this GlyphVector

Returns:

a Point2D object that is the position of the glyph at the specified glyphIndex.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than the number of glyphs in this GlyphVector

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setGlyphPosition

public abstract void setGlyphPosition(int glyphIndex,
                                      Point2D newPos)

Sets the position of the specified glyph within this GlyphVector. This position corresponds to the leading edge of the baseline for the glyph. If glyphIndex equals the number of of glyphs in this GlyphVector, this method sets the position after the last glyph and this position is used to define the advance of the entire GlyphVector.

Parameters:

glyphIndex - the index into this GlyphVector

newPos - the Point2D at which to position the glyph at the specified glyphIndex

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than the number of glyphs in this GlyphVector

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getGlyphTransform

public abstract AffineTransform getGlyphTransform(int glyphIndex)

Gets the transform of the specified glyph within this GlyphVector. The transform is relative to the glyph position. If no special transform has been applied, null can be returned. Such a transform would be an identity transform.

Parameters:

glyphIndex - the index into this GlyphVector

Returns:

an AffineTransform that is the transform of the glyph at the specified glyphIndex.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

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setGlyphTransform

public abstract void setGlyphTransform(int glyphIndex,
                                       AffineTransform newTX)

Sets the transform of the specified glyph within this GlyphVector. The transform is relative to the glyph position. A null argument for newTX indicates that no special transform is applied for the specified glyph. This method can be used to rotate, mirror, translate and scale the glyph. Adding a transform can result in signifant performance changes.

Parameters:

glyphIndex - the index into this GlyphVector

newTx - the specified transform that the transform of the glyph at the specified glyphIndex is set to

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

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getGlyphPositions

public abstract float[] getGlyphPositions(int beginGlyphIndex,
                                          int numEntries,
                                          float[] positionReturn)

Returns an array of glyph positions for the specified glyphs. The position of each glyph corresponds to the leading edge of the baseline for that glyph. This method is used for convenience and performance when processing glyph positions. If no array is passed in, a new array is created. Even numbered array entries beginning with position zero are the X coordinates of the glyph numbered beginGlyphIndex + position/2. Odd numbered array entries beginning with position one are the Y coordinates of the glyph numbered beginGlyphIndex + (position-1)/2. If beginGlyphIndex equals the number of of glyphs in this GlyphVector, this method gets the position after the last glyph and this position is used to define the advance of the entire GlyphVector.

Parameters:

beginGlyphIndex - the index at which to begin retrieving glyph positions

numEntries - the offset from beginGlyphIndex at which to stop retrieving glyph positions

positionReturn - the array that receives the glyph positions and is then returned.

Returns:

an array of glyph positions specified by beginGlyphIndex and numEntries.

Throws:

IllegalArgumentException - if numEntries is less than 0

IndexOutOfBoundsException - if beginGlyphIndex is less than 0

IndexOutOfBoundsException - if the sum of beginGlyphIndex and numEntries is greater than the number of glyphs in this GlyphVector plus one

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getGlyphLogicalBounds

public abstract Shape getGlyphLogicalBounds(int glyphIndex)

Returns the logical bounds of the specified glyph within this GlyphVector. These logical bounds have a total of four edges, with two edges parallel to the baseline under the glyph's transform and the other two edges are shared with adjacent glyphs if they are present. This method is useful for hit-testing of the specified glyph, positioning of a caret at the leading or trailing edge of a glyph, and for drawing a highlight region around the specified glyph.

Parameters:

glyphIndex - the index into this GlyphVector that corresponds to the glyph from which to retrieve its logical bounds

Returns:

a Shape that is the logical bounds of the glyph at the specified glyphIndex.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

See Also:

getGlyphVisualBounds(int)

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getGlyphVisualBounds

public abstract Shape getGlyphVisualBounds(int glyphIndex)

Returns the visual bounds of the specified glyph within the GlyphVector. These visual bounds have a total of four edges, representing the tightest polygon enclosing non-background pixels in the rendered representation of the glyph whose edges are parallel to the edges of the logical bounds. Useful for hit-testing of the specified glyph.

Parameters:

glyphIndex - the index into this GlyphVector that corresponds to the glyph from which to retrieve its visual bounds

Returns:

a Shape that is the visual bounds of the glyph at the specified glyphIndex.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

See Also:

getGlyphLogicalBounds(int)

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getGlyphMetrics

public abstract GlyphMetrics getGlyphMetrics(int glyphIndex)

Returns the metrics of the glyph at the specified index into this GlyphVector.

Parameters:

glyphIndex - the index into this GlyphVector that corresponds to the glyph from which to retrieve its metrics

Returns:

a GlyphMetrics object that represents the metrics of the glyph at the specified glyphIndex into this GlyphVector.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

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getGlyphJustificationInfo

public abstract GlyphJustificationInfo getGlyphJustificationInfo(int glyphIndex)

Returns the justification information for the glyph at the specified index into this GlyphVector.

Parameters:

glyphIndex - the index into this GlyphVector that corresponds to the glyph from which to retrieve its justification properties

Returns:

a GlyphJustificationInfo object that represents the justification properties of the glyph at the specified glyphIndex into this GlyphVector.

Throws:

IndexOutOfBoundsException - if glyphIndex is less than 0 or greater than or equal to the number of glyphs in this GlyphVector

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equals

public abstract boolean equals(GlyphVector set)

Tests if the specified GlyphVector exactly equals this GlyphVector.

Parameters:

set - the specified GlyphVector to test

Returns:

true if the specified GlyphVector equals this GlyphVector; false otherwise.

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