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

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Java^TM 2 Platform
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java.awt.font
Class GraphicAttribute

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

Direct Known Subclasses:: ImageGraphicAttribute, ShapeGraphicAttribute

public abstract class GraphicAttribute
extends Object

This class is used with the CHAR_REPLACEMENT attribute.

The GraphicAttribute class represents a graphic embedded in text. Clients subclass this class to implement their own char replacement graphics. Clients wishing to embed shapes and images in text need not subclass this class. Instead, clients can use the ShapeGraphicAttribute and ImageGraphicAttribute classes.

Subclasses must ensure that their objects are immutable once they are constructed. Mutating a GraphicAttribute that is used in a TextLayout results in undefined behavior from the TextLayout.

Field Summary

static int BOTTOM_ALIGNMENT
          Aligns bottom of graphic to bottom of line.

static int CENTER_BASELINE
          Aligns origin of graphic to center baseline of line.

static int HANGING_BASELINE
          Aligns origin of graphic to hanging baseline of line.

static int ROMAN_BASELINE
          Aligns origin of graphic to roman baseline of line.

static int TOP_ALIGNMENT
          Aligns top of graphic to top of line.

Constructor Summary

protected GraphicAttribute(int alignment)
          Constructs a GraphicAttribute.

Method Summary

abstract void draw(Graphics2D graphics, float x, float y)
          Renders this GraphicAttribute at the specified location.

abstract float getAdvance()
          Returns the advance of this GraphicAttribute.

int getAlignment()
          Returns the alignment of this GraphicAttribute.

abstract float getAscent()
          Returns the ascent of this GraphicAttribute.

Rectangle2D getBounds()
          Returns a Rectangle2D that encloses all of the bits drawn by this GraphicAttribute relative to the rendering position.

abstract float getDescent()
          Returns the descent of this GraphicAttribute.

GlyphJustificationInfo getJustificationInfo()
          Returns the justification information for this GraphicAttribute.

Methods inherited from class java.lang.Object

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

Field Detail

TOP_ALIGNMENT

public static final int TOP_ALIGNMENT

Aligns top of graphic to top of line.

BOTTOM_ALIGNMENT

public static final int BOTTOM_ALIGNMENT

Aligns bottom of graphic to bottom of line.

ROMAN_BASELINE

public static final int ROMAN_BASELINE

Aligns origin of graphic to roman baseline of line.

CENTER_BASELINE

public static final int CENTER_BASELINE

Aligns origin of graphic to center baseline of line.

HANGING_BASELINE

public static final int HANGING_BASELINE

Aligns origin of graphic to hanging baseline of line.

Constructor Detail

GraphicAttribute

protected GraphicAttribute(int alignment)

Constructs a GraphicAttribute. Subclasses use this to define the alignment of the graphic.

Method Detail

getAscent

public abstract float getAscent()

Returns the ascent of this GraphicAttribute. A graphic can be rendered above its ascent.

Returns:: the ascent of this GraphicAttribute.
See Also:: getBounds()

getDescent

public abstract float getDescent()

Returns the descent of this GraphicAttribute. A graphic can be rendered below its descent.

Returns:: the descent of this GraphicAttribute.
See Also:: getBounds()

getAdvance

public abstract float getAdvance()

Returns the advance of this GraphicAttribute. The GraphicAttribute object's advance is the distance from the point at which the graphic is rendered and the point where the next character or graphic is rendered. A graphic can be rendered beyond its advance

Returns:: the advance of this GraphicAttribute.
See Also:: getBounds()

getBounds

public Rectangle2D getBounds()

Returns a Rectangle2D that encloses all of the bits drawn by this GraphicAttribute relative to the rendering position. A graphic may be rendered beyond its origin, ascent, descent, or advance; but if it is, this method's implementation must indicate where the graphic is rendered. Default bounds is the rectangle (0, -ascent, advance, ascent+descent).

Returns:: a Rectangle2D that encloses all of the bits rendered by this GraphicAttribute.

draw

public abstract void draw(Graphics2D graphics,
                          float x,
                          float y)

Renders this GraphicAttribute at the specified location.

Parameters:: graphics - the Graphics2D into which to render the graphic; x, y - the user-space coordinates where the graphic is rendered

getAlignment

public final int getAlignment()

Returns the alignment of this GraphicAttribute. Alignment can be to a particular baseline, or to the absolute top or bottom of a line.

Returns:: the alignment of this GraphicAttribute.

getJustificationInfo

public GlyphJustificationInfo getJustificationInfo()

Returns the justification information for this GraphicAttribute. Subclasses can override this method to provide different justification information.

Returns:: a GlyphJustificationInfo object that contains the justification information for this GraphicAttribute.