org.apache.batik.gvt.text
Interface TextSpanLayout

All Known Implementing Classes:
FlowExtGlyphLayout, FlowGlyphLayout, GlyphLayout

public interface TextSpanLayout

Class that performs layout of attributed text strings into glyph sets paintable by TextPainter instances. Similar to java.awt.font.TextLayout in function and purpose. Note that while this utility interface is provided for the convenience of TextPainter implementations, conforming TextPainters are not required to use this class.

See Also:
TextLayout, TextPainter

Field Summary
static int DECORATION_ALL
           
static int DECORATION_OVERLINE
           
static int DECORATION_STRIKETHROUGH
           
static int DECORATION_UNDERLINE
           
 
Method Summary
 void draw(Graphics2D g2d)
          Paints the specified text layout using the specified Graphics2D and rendering context.
 Point2D getAdvance2D()
          Returns the current text position at the completion of glyph layout.
 Rectangle2D getBounds2D()
          Returns the rectangular bounds of the completed glyph layout.
 int getCharacterCount(int startGlyphIndex, int endGlyphIndex)
          Returns the number of chars represented by the glyphs within the specified range.
 double getComputedOrientationAngle(int index)
          Return the rotation angle applied to the character.
 Shape getDecorationOutline(int decorationType)
          Returns the outline of the specified decorations on the glyphs, transformed by an AffineTransform.
 Rectangle2D getGeometricBounds()
          Returns the bounds of the geometry (this is always the bounds of the outline).
 float[] getGlyphAdvances()
          Returns the advance between each glyph in text progression direction.
 int getGlyphCount()
          Returns the number of glyphs in this layout.
 int getGlyphIndex(int charIndex)
          Returns the glyph index of the glyph that has the specified char index.
 GVTGlyphMetrics getGlyphMetrics(int glyphIndex)
          Returns the Metrics for a particular glyph.
 GVTGlyphVector getGlyphVector()
          Return the glyph vector asociated to this layout.
 Shape getHighlightShape(int beginCharIndex, int endCharIndex)
          Returns a Shape which encloses the currently selected glyphs as specified by glyph indices begin and end.
 GVTLineMetrics getLineMetrics()
          Returns the Line metrics for this text span.
 Point2D getOffset()
          Returns the current text position at the completion beginning of glyph layout, before the application of explicit glyph positioning attributes.
 Shape getOutline()
          Returns the outline of the completed glyph layout, transformed by an AffineTransform.
 Point2D getTextPathAdvance()
           
 boolean hasCharacterIndex(int index)
          Return true is the character index is represented by glyphs in this layout.
 TextHit hitTestChar(float x, float y)
          Perform hit testing for coordinate at x, y.
 boolean isAltGlyph()
          Return true if this text run represents an alt glyph.
 boolean isLeftToRight()
          Returns true if the text direction in this layout is from left to right.
 boolean isOnATextPath()
          Returns true if this layout in on a text path.
 boolean isVertical()
          Returns true if the advance direction of this text is vertical.
 void setOffset(Point2D offset)
          Sets the text position used for the implicit origin of glyph layout.
 void setScale(float xScale, float yScale, boolean adjSpacing)
          Sets the scaling factor to use for string.
 

Field Detail

DECORATION_UNDERLINE

static final int DECORATION_UNDERLINE
See Also:
Constant Field Values

DECORATION_STRIKETHROUGH

static final int DECORATION_STRIKETHROUGH
See Also:
Constant Field Values

DECORATION_OVERLINE

static final int DECORATION_OVERLINE
See Also:
Constant Field Values

DECORATION_ALL

static final int DECORATION_ALL
See Also:
Constant Field Values
Method Detail

draw

void draw(Graphics2D g2d)
Paints the specified text layout using the specified Graphics2D and rendering context.

Parameters:
g2d - the Graphics2D to use

getDecorationOutline

Shape getDecorationOutline(int decorationType)
Returns the outline of the specified decorations on the glyphs, transformed by an AffineTransform.

Parameters:
decorationType - an integer indicating the type(s) of decorations included in this shape. May be the result of "OR-ing" several values together: e.g. DECORATION_UNDERLINE | DECORATION_STRIKETHROUGH

getBounds2D

Rectangle2D getBounds2D()
Returns the rectangular bounds of the completed glyph layout. This includes stroking information, this does not include deocrations.


getGeometricBounds

Rectangle2D getGeometricBounds()
Returns the bounds of the geometry (this is always the bounds of the outline).


getOutline

Shape getOutline()
Returns the outline of the completed glyph layout, transformed by an AffineTransform.


getAdvance2D

Point2D getAdvance2D()
Returns the current text position at the completion of glyph layout. (This is the position that should be used for positioning adjacent layouts.)


getGlyphAdvances

float[] getGlyphAdvances()
Returns the advance between each glyph in text progression direction.


getGlyphMetrics

GVTGlyphMetrics getGlyphMetrics(int glyphIndex)
Returns the Metrics for a particular glyph.


getLineMetrics

GVTLineMetrics getLineMetrics()
Returns the Line metrics for this text span.


getTextPathAdvance

Point2D getTextPathAdvance()

getOffset

Point2D getOffset()
Returns the current text position at the completion beginning of glyph layout, before the application of explicit glyph positioning attributes.


setScale

void setScale(float xScale,
              float yScale,
              boolean adjSpacing)
Sets the scaling factor to use for string. if ajdSpacing is true then only the spacing between glyphs will be adjusted otherwise the glyphs and the spaces between them will be adjusted.

Parameters:
xScale - Scale factor to apply in X direction.
yScale - Scale factor to apply in Y direction.
adjSpacing - True if only spaces should be adjusted.

setOffset

void setOffset(Point2D offset)
Sets the text position used for the implicit origin of glyph layout. Ignored if multiple explicit glyph positioning attributes are present in ACI (e.g. if the aci has multiple X or Y values).


getHighlightShape

Shape getHighlightShape(int beginCharIndex,
                        int endCharIndex)
Returns a Shape which encloses the currently selected glyphs as specified by glyph indices begin and end.

Parameters:
beginCharIndex - the index of the first glyph in the contiguous selection.
endCharIndex - the index of the last glyph in the contiguous selection.

hitTestChar

TextHit hitTestChar(float x,
                    float y)
Perform hit testing for coordinate at x, y.

Parameters:
x - the x coordinate of the point to be tested.
y - the y coordinate of the point to be tested.
Returns:
a TextHit object encapsulating the character index for successful hits and whether the hit is on the character leading edge.

isVertical

boolean isVertical()
Returns true if the advance direction of this text is vertical.


isOnATextPath

boolean isOnATextPath()
Returns true if this layout in on a text path.


getGlyphCount

int getGlyphCount()
Returns the number of glyphs in this layout.


getCharacterCount

int getCharacterCount(int startGlyphIndex,
                      int endGlyphIndex)
Returns the number of chars represented by the glyphs within the specified range.

Parameters:
startGlyphIndex - The index of the first glyph in the range.
endGlyphIndex - The index of the last glyph in the range.
Returns:
The number of chars.

getGlyphIndex

int getGlyphIndex(int charIndex)
Returns the glyph index of the glyph that has the specified char index.

Parameters:
charIndex - The original index of the character in the text node's text string.
Returns:
The index of the matching glyph in this layout's glyph vector, or -1 if a matching glyph could not be found.

isLeftToRight

boolean isLeftToRight()
Returns true if the text direction in this layout is from left to right.


hasCharacterIndex

boolean hasCharacterIndex(int index)
Return true is the character index is represented by glyphs in this layout.

Parameters:
index - index of the character in the ACI.
Returns:
true if the layout represents that character.

getGlyphVector

GVTGlyphVector getGlyphVector()
Return the glyph vector asociated to this layout.

Returns:
glyph vector

getComputedOrientationAngle

double getComputedOrientationAngle(int index)
Return the rotation angle applied to the character.

Parameters:
index - index of the character in the ACI
Returns:
rotation angle

isAltGlyph

boolean isAltGlyph()
Return true if this text run represents an alt glyph.



Copyright © 2008 Apache Software Foundation. All Rights Reserved.