org.apache.fop.render.java2d

Class Java2DFontMetrics

java.lang.Object

org.apache.fop.render.java2d.Java2DFontMetrics

public class Java2DFontMetrics
extends java.lang.Object

This is a FontMetrics to be used for AWT rendering. It instanciates a font, depening on family and style values. The java.awt.FontMetrics for this font is then created to be used for the actual measurement. Since layout is word by word and since it is expected that two subsequent words often share the same style, the Font and FontMetrics is buffered and only changed if needed.

Since FontState and FontInfo multiply all factors by size, we assume a "standard" font of FONT_SIZE.

Field Summary

Fields

Modifier and Type	Field and Description
static int	FONT_FACTOR This factor multiplies the calculated values to scale to FOP internal measurements
static int	FONT_SIZE Font size standard used for metric measurements

Constructor Summary

Constructors

Constructor and Description
Java2DFontMetrics() Constructs a new Font-metrics.

Method Summary

Methods

Modifier and Type	Method and Description
int	getAscender(java.lang.String family, int style, int size) Determines the font ascent of the Font described by this FontMetrics object
int	getCapHeight(java.lang.String family, int style, int size) The size of a capital letter measured from the font's baseline
int	getDescender(java.lang.String family, int style, int size) Determines the font descent of the Font described by this FontMetrics object
java.awt.Font	getFont(java.lang.String family, int style, int size) Returns a java.awt.Font instance for the desired family, style and size type.
int	getMaxAscent(java.lang.String family, int style, int size) Determines the font's maximum ascent of the Font described by the current FontMetrics object
int[]	getWidths(java.lang.String family, int style, int size) Return widths (in 1/1000ths of point size) of all characters
int	getXHeight(java.lang.String family, int style, int size) Determines the typical font height of a small cap letter FontMetrics object
boolean	hasChar(java.lang.String family, int style, int size, char c) Indicates whether the font contains a particular character/glyph.
int	width(int i, java.lang.String family, int style, int size) Returns width (in 1/1000ths of point size) of character at code point i

Methods inherited from class java.lang.Object

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

Field Detail

FONT_SIZE

public static final int FONT_SIZE

Font size standard used for metric measurements

See Also:

Constant Field Values

FONT_FACTOR

public static final int FONT_FACTOR

This factor multiplies the calculated values to scale to FOP internal measurements

See Also:

Constant Field Values

Constructor Detail

Java2DFontMetrics

public Java2DFontMetrics()

Constructs a new Font-metrics.

Method Detail

getMaxAscent

public int getMaxAscent(java.lang.String family,
               int style,
               int size)

Determines the font's maximum ascent of the Font described by the current FontMetrics object

Parameters:

family - font family (java name) to use

style - font style (java def.) to use

size - font size

Returns:

ascent in milliponts

getAscender

public int getAscender(java.lang.String family,
              int style,
              int size)

Determines the font ascent of the Font described by this FontMetrics object

Parameters:

family - font family (java name) to use

style - font style (java def.) to use

size - font size

Returns:

ascent in milliponts

getCapHeight

public int getCapHeight(java.lang.String family,
               int style,
               int size)

The size of a capital letter measured from the font's baseline

Parameters:

family - font family

style - font style

size - font size

Returns:

capital height in millipoints

getDescender

public int getDescender(java.lang.String family,
               int style,
               int size)

Determines the font descent of the Font described by this FontMetrics object

Parameters:

family - font family (jave name) to use

style - font style (jave def.) to use

size - font size

Returns:

descent in milliponts

getXHeight

public int getXHeight(java.lang.String family,
             int style,
             int size)

Determines the typical font height of a small cap letter FontMetrics object

Parameters:

family - font family (jave name) to use

style - font style (jave def.) to use

size - font size

Returns:

font height in milliponts

width

public int width(int i,
        java.lang.String family,
        int style,
        int size)

Returns width (in 1/1000ths of point size) of character at code point i

Parameters:

i - the character for which to get the width

family - font family (jave name) to use

style - font style (jave def.) to use

size - font size

Returns:

character width in millipoints

getWidths

public int[] getWidths(java.lang.String family,
              int style,
              int size)

Return widths (in 1/1000ths of point size) of all characters

Parameters:

family - font family (jave name) to use

style - font style (jave def.) to use

size - font size

Returns:

array of character widths in millipoints

getFont

public java.awt.Font getFont(java.lang.String family,
                    int style,
                    int size)

Returns a java.awt.Font instance for the desired family, style and size type. This is here, so that the font-mapping of FOP-defined fonts to java-fonts can be done in one place and does not need to occur in AWTFontRenderer.

Parameters:

family - font family (jave name) to use

style - font style (jave def.) to use

size - font size

Returns:

font with the desired characeristics.

hasChar

public boolean hasChar(java.lang.String family,
              int style,
              int size,
              char c)

Indicates whether the font contains a particular character/glyph.

Parameters:

family - font family (jave name) to use

style - font style (jave def.) to use

size - font size

c - the glyph to check

Returns:

true if the character is supported