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Class ncsa.horizon.awt.color.PixelFormat

java.lang.Object
  |
  +--java.text.Format
        |
        +--ncsa.horizon.awt.color.PixelFormat

Subclasses:

HSBPixelFormat

public class PixelFormat

extends java.text.Format

a Format object for reading in a color and opacity.

This Format supports three formats for describing a color and its opacity:

• 4 space-delimited decimal numbers indicating rgba: e.g. 255 255 255 255
• 0x hexidecimal format: e.g. 0xffffffff
• # hexidecimal format: e.g. 0xffffffff

Other formats can be supported by subclassing this class.

The Object handed to format as well as the result of parsing is a 4-element byte array containing the red, green, blue, and alpha values.

See Also:

Serialized Form

Field Summary

static int	FOURCOMPONENT an identifier of the four decimal component format
static int	HEX_0x an identifier of the 0x Hexidecimal format
static int	HEX_lb an identifier of the # Hexidecimal format
static int	NEWTYPE an unknown format.

Constructor Summary

PixelFormat()

PixelFormat(int format_type, int ntypes)
contruct this Format objects to format pixel values using a specified type.

PixelFormat(int format_type)
contruct this Format objects to format pixel values using a specified type.

Method Summary

java.lang.StringBuffer	format(byte[] pixel, java.lang.StringBuffer buf) format the 4-component pixel value and append results to a buffer.
java.lang.StringBuffer	format(java.lang.Object obj, java.lang.StringBuffer toAppendTo, java.text.FieldPosition pos)
java.lang.Object	parseObject(java.lang.String source, java.text.ParsePosition status)
byte[]	parsePixel(java.lang.String s, java.text.ParsePosition stat)

Methods inherited from class java.text.Format

clone, format, format, parseObject, parseObject

Methods inherited from class java.lang.Object

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

Field Detail

FOURCOMPONENT

public static final int FOURCOMPONENT

an identifier of the four decimal component format

HEX_0x

public static final int HEX_0x

an identifier of the 0x Hexidecimal format

HEX_lb

public static final int HEX_lb

an identifier of the # Hexidecimal format

NEWTYPE

public static final int NEWTYPE

an unknown format. Subclasses should identify new format types starting with this value.

Constructor Detail

PixelFormat

public PixelFormat()

PixelFormat

protected PixelFormat(int format_type,
                      int ntypes)

contruct this Format objects to format pixel values using a specified type.

Parameters:

format_type - the format type code

ntypes - the number of formats recognized by this subclass

Throws:

java.lang.IllegalArgumentException - if format_type >= ntypes

PixelFormat

public PixelFormat(int format_type)

contruct this Format objects to format pixel values using a specified type.

Throws:

java.lang.IllegalArgumentException - if format_type > 2

Method Detail

format

public java.lang.StringBuffer format(byte[] pixel,
                           java.lang.StringBuffer buf)

format the 4-component pixel value and append results to a buffer. Subclasses should override this method to support new formats.

format

public java.lang.StringBuffer format(java.lang.Object obj,
                           java.lang.StringBuffer toAppendTo,
                           java.text.FieldPosition pos)

Overrides:

format in class java.text.Format

parsePixel

public byte[] parsePixel(java.lang.String s,
                         java.text.ParsePosition stat)

parseObject

public java.lang.Object parseObject(java.lang.String source,
                          java.text.ParsePosition status)

Overrides:

parseObject in class java.text.Format