Module java.desktop
Package 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 Details

    • TOP_ALIGNMENT

      public static final int TOP_ALIGNMENT
      Aligns top of graphic to top of line.
      See Also:
      Constant Field Values

    • BOTTOM_ALIGNMENT

      public static final int BOTTOM_ALIGNMENT
      Aligns bottom of graphic to bottom of line.
      See Also:
      Constant Field Values

    • ROMAN_BASELINE

      public static final int ROMAN_BASELINE
      Aligns origin of graphic to roman baseline of line.
      See Also:
      Constant Field Values

    • CENTER_BASELINE

      public static final int CENTER_BASELINE
      Aligns origin of graphic to center baseline of line.
      See Also:
      Constant Field Values

    • HANGING_BASELINE

      public static final int HANGING_BASELINE
      Aligns origin of graphic to hanging baseline of line.
      See Also:
      Constant Field Values

  • Constructor Details

    • GraphicAttribute

      protected GraphicAttribute​(int alignment)
      Constructs a GraphicAttribute. Subclasses use this to define the alignment of the graphic.
      Parameters:
      alignment - an int representing one of the GraphicAttribute alignment fields
      Throws:
      IllegalArgumentException - if alignment is not one of the five defined values.

  • Method Details

    • 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.

    • getOutline

      public Shape getOutline​(AffineTransform tx)
      Return a Shape that represents the region that this GraphicAttribute renders. This is used when a TextLayout is requested to return the outline of the text. The (untransformed) shape must not extend outside the rectangular bounds returned by getBounds. The default implementation returns the rectangle returned by getBounds(), transformed by the provided AffineTransform if present.
      Parameters:
      tx - an optional AffineTransform to apply to the outline of this GraphicAttribute. This can be null.
      Returns:
      a Shape representing this graphic attribute, suitable for stroking or filling.
      Since:
      1.6

    • 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 - the user-space X coordinate where the graphic is rendered
      y - the user-space Y coordinate 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.