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Java AWT

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java.awt Reference
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FontMetrics

Name

FontMetrics

[Graphic: Figure from the text]

Description

The FontMetrics class provides the means to calculate actual width and height of text if drawn on the screen.

Class Definition

public abstract class java.awt.FontMetrics
    extends java.lang.Object
    implements java.io.Serializable {
  
  // Variables
  protected Font font;
  
  // Constructors
  protected FontMetrics (Font font);
  
  // Instance Methods
  public int bytesWidth (byte data[], int offset, int length);
  public int charsWidth (char data[], int offset, int length);
  public int charWidth (char character);
  public int charWidth (int character);
  public int getAscent();
  public int getDescent();
  public Font getFont();
  public int getHeight();
  public int getLeading();
  public int getMaxAdvance();
  public int getMaxAscent();
  public int getMaxDecent();
  public int getMaxDescent();
  public int[] getWidths();
  public int stringWidth (String string);
  public String toString();
}

Variables

font

protected Font font

The Font object whose metrics are represented by this object.

Constructors

FontMetrics

protected FontMetrics (Font font)

Parameters

font

The Font object whose metrics you want.

Description

Constructs a platform specific FontMetrics object for the given font.

Instance Methods

bytesWidth

public int bytesWidth (byte data[], int offset, int length)

Parameters

data[]

Array of characters to lookup.

offset

Initial character position.

length

Number of characters to lookup.

Returns

Advance width of characters in the array, starting with offset and ending with offset+length, in pixels.

Throws

ArrayIndexOutOfBoundsException

If offset or length is invalid.

charsWidth

public int charsWidth (char data[], int offset, int length)

Parameters

data[]

Array of characters to lookup.

offset

Initial character position.

length

Number of characters to lookup.

Returns

Advance width of characters in the array, starting with offset and ending with offset+length-1, in pixels.

Throws

ArrayIndexOutOfBoundsException

If offset or length is invalid.

charWidth

public int charWidth (char character)

Parameters

character

character to lookup

Returns

Advanced pixel width of character.

public int charWidth (int character)

Parameters

character

int value of character to lookup

Returns

Advanced pixel width of character.

getAscent

public int getAscent()

Returns

Amount of space above the baseline required for the tallest character in the font.

getDescent

public int getDescent()

Returns

Amount of space below the baseline required for the lowest descender (e.g., the tail on "p") in the font.

getFont

public Font getFont()

Returns

The Font whose metrics are represented by this object.

getHeight

public int getHeight()

Returns

The sum of getDescent(), getAscent(), and getLeading(); recommended total space between baselines.

getLeading

public int getLeading()

Returns

Retrieves recommended amount of space between lines of text.

getMaxAdvance

public int getMaxAdvance()

Returns

Retrieves advance pixel width of widest character in the font.

getMaxAscent

public int getMaxAscent()

Returns

Retrieves maximum amount of space above the baseline required for the tallest character within the font's FontMetrics. May differ from getAscent() for characters with diacritical marks.

getMaxDecent

public int getMaxDecent()

Returns

Retrieves the maximum amount of space below the baseline required for the deepest character for the font.

Description

A misspelling of getMaxDescent().

getMaxDescent

public int getMaxDescent()

Returns

Retrieves the maximum amount of space below the baseline required for the deepest character for the font.

getWidths

public int[] getWidths()

Returns

255 element array of character widths.

Description

Retrieves an integer array of the advance widths of the first 255 characters in the FontMetrics' font.

stringWidth

public int stringWidth (String string)

Parameters

string

Character string to lookup.

Returns

Advance pixel width of string.

toString

public String toString()

Returns

A string representation of the FontMetrics object.

Overrides

Object.toString()

See Also

Font, Object, String


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