Class java.awt.image.IndexColorModel - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.awt.image.IndexColorModel

java.lang.Object
   |
   +----java.awt.image.ColorModel
           |
           +----java.awt.image.IndexColorModel

public class IndexColorModel
extends ColorModel

A ColorModel class that specifies a translation from pixel values to alpha, red, green, and blue color components for pixels which represent indices into a fixed colormap. An optional transparent pixel value can be supplied which indicates a completely transparent pixel, regardless of any alpha value recorded for that pixel value. This color model is similar to an X11 PseudoColor visual.

Many of the methods in this class are final. The reason for this is that the underlying native graphics code makes assumptions about the layout and operation of this class and those assumptions are reflected in the implementations of the methods here that are marked final. You can subclass this class for other reaons, but you cannot override or modify the behaviour of those methods.

See Also:: ColorModel

IndexColorModel(int, int, byte[], byte[], byte[]): Constructs an IndexColorModel from the given arrays of red, green, and blue components.
IndexColorModel(int, int, byte[], byte[], byte[], byte[]): Constructs an IndexColorModel from the given arrays of red, green, blue and alpha components.
IndexColorModel(int, int, byte[], byte[], byte[], int): Constructs an IndexColorModel from the given arrays of red, green, and blue components.
IndexColorModel(int, int, byte[], int, boolean): Constructs an IndexColorModel from a single arrays of packed red, green, blue and optional alpha components.
IndexColorModel(int, int, byte[], int, boolean, int): Constructs an IndexColorModel from a single arrays of packed red, green, blue and optional alpha components.

getAlpha(int): Returns the alpha transparency value for the specified pixel in the range 0-255.
getAlphas(byte[]): Copies the array of alpha transparency values into the given array.
getBlue(int): Returns the blue color compoment for the specified pixel in the range 0-255.
getBlues(byte[]): Copies the array of blue color components into the given array.
getGreen(int): Returns the green color compoment for the specified pixel in the range 0-255.
getGreens(byte[]): Copies the array of green color components into the given array.
getMapSize(): Returns the size of the color component arrays in this IndexColorModel.
getRed(int): Returns the red color compoment for the specified pixel in the range 0-255.
getReds(byte[]): Copies the array of red color components into the given array.
getRGB(int): Returns the color of the pixel in the default RGB color model.
getTransparentPixel(): Returns the index of the transparent pixel in this IndexColorModel or -1 if there is no transparent pixel.

IndexColorModel

 public IndexColorModel(int bits,
                        int size,
                        byte r[],
                        byte g[],
                        byte b[])

Constructs an IndexColorModel from the given arrays of red, green, and blue components. Pixels described by this color model will all have alpha components of 255 (fully opaque). All of the arrays specifying the color components must have at least the specified number of entries.

Parameters:: bits - The number of bits each pixel occupies.; size - The size of the color component arrays.; r - The array of red color components.; g - The array of green color components.; b - The array of blue color components.

IndexColorModel

 public IndexColorModel(int bits,
                        int size,
                        byte r[],
                        byte g[],
                        byte b[],
                        int trans)

Constructs an IndexColorModel from the given arrays of red, green, and blue components. Pixels described by this color model will all have alpha components of 255 (fully opaque), except for the indicated transparent pixel. All of the arrays specifying the color components must have at least the specified number of entries.

Parameters:: bits - The number of bits each pixel occupies.; size - The size of the color component arrays.; r - The array of red color components.; g - The array of green color components.; b - The array of blue color components.; trans - The index of the transparent pixel.

IndexColorModel

 public IndexColorModel(int bits,
                        int size,
                        byte r[],
                        byte g[],
                        byte b[],
                        byte a[])

Constructs an IndexColorModel from the given arrays of red, green, blue and alpha components. All of the arrays specifying the color components must have at least the specified number of entries.

Parameters:: bits - The number of bits each pixel occupies.; size - The size of the color component arrays.; r - The array of red color components.; g - The array of green color components.; b - The array of blue color components.; a - The array of alpha value components.

IndexColorModel

 public IndexColorModel(int bits,
                        int size,
                        byte cmap[],
                        int start,
                        boolean hasalpha)

Constructs an IndexColorModel from a single arrays of packed red, green, blue and optional alpha components. The array must have enough values in it to fill all of the needed component arrays of the specified size.

Parameters:: bits - The number of bits each pixel occupies.; size - The size of the color component arrays.; cmap - The array of color components.; start - The starting offset of the first color component.; hasalpha - Indicates whether alpha values are contained in the cmap array.

IndexColorModel

 public IndexColorModel(int bits,
                        int size,
                        byte cmap[],
                        int start,
                        boolean hasalpha,
                        int trans)

Constructs an IndexColorModel from a single arrays of packed red, green, blue and optional alpha components. The specified transparent index represents a pixel which will be considered entirely transparent regardless of any alpha value specified for it. The array must have enough values in it to fill all of the needed component arrays of the specified size.

Parameters:: bits - The number of bits each pixel occupies.; size - The size of the color component arrays.; cmap - The array of color components.; start - The starting offset of the first color component.; hasalpha - Indicates whether alpha values are contained in the cmap array.; trans - The index of the fully transparent pixel.

getMapSize

 public final int getMapSize()

Returns the size of the color component arrays in this IndexColorModel.

getTransparentPixel

 public final int getTransparentPixel()

Returns the index of the transparent pixel in this IndexColorModel or -1 if there is no transparent pixel.

getReds

 public final void getReds(byte r[])

Copies the array of red color components into the given array. Only the initial entries of the array as specified by getMapSize() are written.

getGreens

 public final void getGreens(byte g[])

Copies the array of green color components into the given array. Only the initial entries of the array as specified by getMapSize() are written.

getBlues

 public final void getBlues(byte b[])

Copies the array of blue color components into the given array. Only the initial entries of the array as specified by getMapSize() will be written.

getAlphas

 public final void getAlphas(byte a[])

Copies the array of alpha transparency values into the given array. Only the initial entries of the array as specified by getMapSize() will be written.

getRed

 public final int getRed(int pixel)

Returns the red color compoment for the specified pixel in the range 0-255.

Overrides:: getRed in class ColorModel

getGreen

 public final int getGreen(int pixel)

Returns the green color compoment for the specified pixel in the range 0-255.

Overrides:: getGreen in class ColorModel

getBlue

 public final int getBlue(int pixel)

Returns the blue color compoment for the specified pixel in the range 0-255.

Overrides:: getBlue in class ColorModel

getAlpha

 public final int getAlpha(int pixel)

Returns the alpha transparency value for the specified pixel in the range 0-255.

Overrides:: getAlpha in class ColorModel

getRGB

 public final int getRGB(int pixel)

Returns the color of the pixel in the default RGB color model.

Overrides:: getRGB in class ColorModel
See Also:: getRGBdefault

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