org.apache.pdfbox.pdmodel.font
Class PDFont

java.lang.Object
  extended by org.apache.pdfbox.pdmodel.font.PDFont
All Implemented Interfaces:
COSObjectable
Direct Known Subclasses:
PDCIDFont, PDSimpleFont

public abstract class PDFont
extends Object
implements COSObjectable

This is the base class for all PDF fonts.

Version:
$Revision: 1.46 $
Author:
Ben Litchfield

Field Summary
protected  COSDictionary font
          The cos dictionary for this font.
 
Constructor Summary
PDFont()
          Constructor.
PDFont(COSDictionary fontDictionary)
          Constructor.
 
Method Summary
static void clearResources()
          This will clear AFM resources that are stored statically.
abstract  void drawString(String string, Graphics g, float fontSize, AffineTransform at, float x, float y)
          This will draw a string on a canvas using the font.
 String encode(byte[] c, int offset, int length)
          This will perform the encoding of a character if needed.
 boolean equals(Object other)
          
protected  org.apache.fontbox.afm.FontMetric getAFM()
          This will get an AFM object if one exists.
abstract  float getAverageFontWidth()
          This will get the average font width for all characters.
protected  float getAverageFontWidthFromAFMFile()
          This will attempt to get the average font width from an AFM file.
 String getBaseFont()
          The PostScript name of the font.
protected  int getCodeFromArray(byte[] data, int offset, int length)
          Used for multibyte encodings.
 COSBase getCOSObject()
          Convert this standard java object to a COS object.
 Encoding getEncoding()
          This will get or create the encoder.
protected static EncodingManager getEncodingManager()
           
 int getFirstChar()
          The code for the first char or -1 if there is none.
abstract  PDRectangle getFontBoundingBox()
          This will get the fonts bouding box.
abstract  float getFontHeight(byte[] c, int offset, int length)
          This will get the font width for a character.
 PDMatrix getFontMatrix()
          This will get the matrix that is used to transform glyph space to text space.
abstract  float getFontWidth(byte[] c, int offset, int length)
          This will get the font width for a character.
protected  float getFontWidthFromAFMFile(int code)
          This will attempt to get the font width from an AFM file.
 int getLastChar()
          The code for the last char or -1 if there is none.
 float getStringWidth(String string)
          This will get the width of this string for this font.
 String getSubType()
          This will get the subtype of font, Type1, Type3, ...
 String getType()
          This will always return "Font" for fonts.
 List getWidths()
          The widths of the characters.
 int hashCode()
          
 void setBaseFont(String baseFont)
          Set the PostScript name of the font.
 void setEncoding(Encoding enc)
          The will set the encoding for this font.
 void setFirstChar(int firstChar)
          Set the first character this font supports.
 void setLastChar(int lastChar)
          Set the last character this font supports.
 void setWidths(List widths)
          Set the widths of the characters code.
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

font

protected COSDictionary font
The cos dictionary for this font.

Constructor Detail

PDFont

public PDFont()
Constructor.


PDFont

public PDFont(COSDictionary fontDictionary)
Constructor.

Parameters:
fontDictionary - The font dictionary according to the PDF specification.
Method Detail

clearResources

public static void clearResources()
This will clear AFM resources that are stored statically. This is usually not a problem unless you want to reclaim resources for a long running process. SPECIAL NOTE: The font calculations are currently in COSObject, which is where they will reside until PDFont is mature enough to take them over. PDFont is the appropriate place for them and not in COSObject but we need font calculations for text extraction. THIS METHOD WILL BE MOVED OR REMOVED TO ANOTHER LOCATION IN A FUTURE VERSION OF PDFBOX.


getCOSObject

public COSBase getCOSObject()
Convert this standard java object to a COS object.

Specified by:
getCOSObject in interface COSObjectable
Returns:
The cos object that matches this Java object.

getFontWidth

public abstract float getFontWidth(byte[] c,
                                   int offset,
                                   int length)
                            throws IOException
This will get the font width for a character.

Parameters:
c - The character code to get the width for.
offset - The offset into the array.
length - The length of the data.
Returns:
The width is in 1000 unit of text space, ie 333 or 777
Throws:
IOException - If an error occurs while parsing.

getFontHeight

public abstract float getFontHeight(byte[] c,
                                    int offset,
                                    int length)
                             throws IOException
This will get the font width for a character.

Parameters:
c - The character code to get the width for.
offset - The offset into the array.
length - The length of the data.
Returns:
The width is in 1000 unit of text space, ie 333 or 777
Throws:
IOException - If an error occurs while parsing.

getStringWidth

public float getStringWidth(String string)
                     throws IOException
This will get the width of this string for this font.

Parameters:
string - The string to get the width of.
Returns:
The width of the string in 1000 units of text space, ie 333 567...
Throws:
IOException - If there is an error getting the width information.

getAverageFontWidth

public abstract float getAverageFontWidth()
                                   throws IOException
This will get the average font width for all characters.

Returns:
The width is in 1000 unit of text space, ie 333 or 777
Throws:
IOException - If an error occurs while parsing.

drawString

public abstract void drawString(String string,
                                Graphics g,
                                float fontSize,
                                AffineTransform at,
                                float x,
                                float y)
                         throws IOException
This will draw a string on a canvas using the font.

Parameters:
string - The string to draw.
g - The graphics to draw onto.
fontSize - The size of the font to draw.
at - The transformation matrix with all infos for scaling and shearing of the font.
x - The x coordinate to draw at.
y - The y coordinate to draw at.
Throws:
IOException - If there is an error drawing the specific string.

getCodeFromArray

protected int getCodeFromArray(byte[] data,
                               int offset,
                               int length)
Used for multibyte encodings.

Parameters:
data - The array of data.
offset - The offset into the array.
length - The number of bytes to use.
Returns:
The int value of data from the array.

getFontWidthFromAFMFile

protected float getFontWidthFromAFMFile(int code)
                                 throws IOException
This will attempt to get the font width from an AFM file.

Parameters:
code - The character code we are trying to get.
Returns:
The font width from the AFM file.
Throws:
IOException - if we cannot find the width.

getAverageFontWidthFromAFMFile

protected float getAverageFontWidthFromAFMFile()
                                        throws IOException
This will attempt to get the average font width from an AFM file.

Returns:
The average font width from the AFM file.
Throws:
IOException - if we cannot find the width.

getAFM

protected org.apache.fontbox.afm.FontMetric getAFM()
                                            throws IOException
This will get an AFM object if one exists.

Returns:
The afm object from the name.
Throws:
IOException - If there is an error getting the AFM object.

encode

public String encode(byte[] c,
                     int offset,
                     int length)
              throws IOException
This will perform the encoding of a character if needed.

Parameters:
c - The character to encode.
offset - The offset into the array to get the data
length - The number of bytes to read.
Returns:
The value of the encoded character.
Throws:
IOException - If there is an error during the encoding.

setEncoding

public void setEncoding(Encoding enc)
The will set the encoding for this font.

Parameters:
enc - The font encoding.

getEncoding

public Encoding getEncoding()
                     throws IOException
This will get or create the encoder. modified by Christophe Huault : DGBS Strasbourg huault@free.fr october 2004

Returns:
The encoding to use.
Throws:
IOException - If there is an error getting the encoding.

getType

public String getType()
This will always return "Font" for fonts.

Returns:
The type of object that this is.

getSubType

public String getSubType()
This will get the subtype of font, Type1, Type3, ...

Returns:
The type of font that this is.

getBaseFont

public String getBaseFont()
The PostScript name of the font.

Returns:
The postscript name of the font.

setBaseFont

public void setBaseFont(String baseFont)
Set the PostScript name of the font.

Parameters:
baseFont - The postscript name for the font.

getFirstChar

public int getFirstChar()
The code for the first char or -1 if there is none.

Returns:
The code for the first character.

setFirstChar

public void setFirstChar(int firstChar)
Set the first character this font supports.

Parameters:
firstChar - The first character.

getLastChar

public int getLastChar()
The code for the last char or -1 if there is none.

Returns:
The code for the last character.

setLastChar

public void setLastChar(int lastChar)
Set the last character this font supports.

Parameters:
lastChar - The last character.

getWidths

public List getWidths()
The widths of the characters. This will be null for the standard 14 fonts.

Returns:
The widths of the characters.

setWidths

public void setWidths(List widths)
Set the widths of the characters code.

Parameters:
widths - The widths of the character codes.

getFontMatrix

public PDMatrix getFontMatrix()
This will get the matrix that is used to transform glyph space to text space. By default there are 1000 glyph units to 1 text space unit, but type3 fonts can use any value. Note:If this is a type3 font then it can be modified via the PDType3Font.setFontMatrix, otherwise this is a read-only property.

Returns:
The matrix to transform from glyph space to text space.

getFontBoundingBox

public abstract PDRectangle getFontBoundingBox()
                                        throws IOException
This will get the fonts bouding box.

Returns:
The fonts bouding box.
Throws:
IOException - If there is an error getting the bounding box.

equals

public boolean equals(Object other)

Overrides:
equals in class Object

hashCode

public int hashCode()

Overrides:
hashCode in class Object

getEncodingManager

protected static EncodingManager getEncodingManager()


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