loci.poi.hssf.usermodel

Class HSSFPalette

java.lang.Object

loci.poi.hssf.usermodel.HSSFPalette

public class HSSFPalette
extends Object

Represents a workbook color palette. Internally, the XLS format refers to colors using an offset into the palette record. Thus, the first color in the palette has the index 0x8, the second has the index 0x9, etc. through 0x40

Author:

Brian Sanders (bsanders at risklabs dot com)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	HSSFPalette.CustomColor

Field Summary

Fields

Modifier and Type	Field and Description
private PaletteRecord	palette

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	HSSFPalette(PaletteRecord palette)

Method Summary

Methods

Modifier and Type	Method and Description
HSSFColor	addColor(byte red, byte green, byte blue) Adds a new color into an empty color slot.
HSSFColor	findColor(byte red, byte green, byte blue) Finds the first occurance of a given color
HSSFColor	findSimilarColor(byte red, byte green, byte blue) Finds the closest matching color in the custom palette.
HSSFColor	getColor(short index) Retrieves the color at a given index
void	setColorAtIndex(short index, byte red, byte green, byte blue) Sets the color at the given offset

Methods inherited from class java.lang.Object

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

Field Detail

palette

private PaletteRecord palette

Constructor Detail

HSSFPalette

protected HSSFPalette(PaletteRecord palette)

Method Detail

getColor

public HSSFColor getColor(short index)

Retrieves the color at a given index

Parameters:

index - the palette index, between 0x8 to 0x40 inclusive

Returns:

the color, or null if the index is not populated

findColor

public HSSFColor findColor(byte red,
                  byte green,
                  byte blue)

Finds the first occurance of a given color

Parameters:

red - the RGB red component, between 0 and 255 inclusive

green - the RGB green component, between 0 and 255 inclusive

blue - the RGB blue component, between 0 and 255 inclusive

Returns:

the color, or null if the color does not exist in this palette

findSimilarColor

public HSSFColor findSimilarColor(byte red,
                         byte green,
                         byte blue)

Finds the closest matching color in the custom palette. The method for finding the distance between the colors is fairly primative.

Parameters:

red - The red component of the color to match.

green - The green component of the color to match.

blue - The blue component of the color to match.

Returns:

The closest color or null if there are no custom colors currently defined.

setColorAtIndex

public void setColorAtIndex(short index,
                   byte red,
                   byte green,
                   byte blue)

Sets the color at the given offset

Parameters:

index - the palette index, between 0x8 to 0x40 inclusive

red - the RGB red component, between 0 and 255 inclusive

green - the RGB green component, between 0 and 255 inclusive

blue - the RGB blue component, between 0 and 255 inclusive

addColor

public HSSFColor addColor(byte red,
                 byte green,
                 byte blue)

Adds a new color into an empty color slot.

Parameters:

red - The red component

green - The green component

blue - The blue component

Returns:

The new custom color.

Throws:

RuntimeException - if there are more more free color indexes.