echopoint.util
Class ColorKit

java.lang.Object
  echopoint.util.ColorKit

public class ColorKit
extends java.lang.Object

A utility to class to help with Color manipulation

Field Summary

static double	COLOR_FACTOR The default scale factor applied to the brighter and darker functions
static java.lang.String[]	ColorConstantStrings Array for acceptable Color Constant strings
static Color[]	ColorConstantValues An array for Color values matching ColorConstantStrings
static int	SWAP_OP_BGR swapRGB Operation - R = B, G = G, B = R
static int	SWAP_OP_BRG swapRGB Operation - R = B, G = R, B = G
static int	SWAP_OP_GBR swapRGB Operation - R = G, G = B, B = R
static int	SWAP_OP_GRB swapRGB Operation - R = G, G = R, B = B
static int	SWAP_OP_RBG swapRGB Operation - R = R, G = B, B = G

Method Summary

static Color	brighter(Color color) Creates a brighter version of this color.
static Color	brighter(Color color, double factor) Creates a brighter version of this color, according to the provided factor.
static Color	clr(int r, int g, int b) Shortcut synonym for makeColor(r,g,b);
static Color	clr(java.lang.String colorString) Shortcut synonym for makeColor(colorString);
static Color	darker(Color color) Creates a darker version of this color.
static Color	darker(Color color, double factor) Creates a darker version of this color, according to the provided factor.
static Color	findBackground(Component comp) Searchs the heirarchy tree of the component and finds the first non null background Color object.
static Color	findForeground(Component comp) Searchs the heirarchy tree of the component and finds the first non null foreground Color object.
static Color	invertColor(Color color) Returns the inversion of a color.
static boolean	isColor(java.lang.String colorString) Returns true if the attrValue is a valid representation of a Color value.
static java.awt.Color	makeAwtColor(Color echoColor, java.awt.Color defaultAwtColor) Creates an java.awt.Color object from a nextapp.echo.Color object, or uses the default AWT if the echoColor object is null
static Color	makeColor(int r, int g, int b) Returns a Color object from the red, green and blue integer values.
static Color	makeColor(java.lang.String colorString) Returns a Color object from the string representation The color string must be in the format : - #rrggbb where rr, gg, bb are hexidecimal integer values - rgb( r, g, b) where r,g,b are integer values - color( r, g, b) where r,g,b are integer values - null will return a null color otherwise an IllegalArgumentException is thrown.
static java.lang.String	makeColorString(Color color) Returns the Color in the form : color(r,g,b);
static java.lang.String	makeCSSColor(Color color) Returns the Hex W3C CSS color string for a given color ie #rrggbb
static java.lang.String	makeHexColor(Color color) Returns the Hex string for a given color for example 'rrggbb' Note it does NOT have the # character at the front
static Color	swapRGB(Color swapColor, int swapOperation) This will swap the red/green/blue elements of a color according to the swapOperation, which may be one of : SWAP_OP_RBG SWAP_OP_BGR SWAP_OP_BRG SWAP_OP_GRB SWAP_OP_GBR
static Color	tint(Color clr, double red, double green, double blue) Tints a given color by a factor given in red, blue and green.
static void	writeCSSColor(java.io.PrintWriter pw, Color color)

Methods inherited from class java.lang.Object

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

Field Detail

ColorConstantStrings

public static java.lang.String[] ColorConstantStrings

Array for acceptable Color Constant strings

ColorConstantValues

public static Color[] ColorConstantValues

An array for Color values matching ColorConstantStrings

COLOR_FACTOR

public static final double COLOR_FACTOR

The default scale factor applied to the brighter and darker functions

See Also:

Constant Field Values

SWAP_OP_BGR

public static final int SWAP_OP_BGR

swapRGB Operation - R = B, G = G, B = R

See Also:

Constant Field Values

SWAP_OP_BRG

public static final int SWAP_OP_BRG

swapRGB Operation - R = B, G = R, B = G

See Also:

Constant Field Values

SWAP_OP_GBR

public static final int SWAP_OP_GBR

swapRGB Operation - R = G, G = B, B = R

See Also:

Constant Field Values

SWAP_OP_GRB

public static final int SWAP_OP_GRB

swapRGB Operation - R = G, G = R, B = B

See Also:

Constant Field Values

SWAP_OP_RBG

public static final int SWAP_OP_RBG

swapRGB Operation - R = R, G = B, B = G

See Also:

Constant Field Values

Method Detail

brighter

public static Color brighter(Color color)

Creates a brighter version of this color.

This method applies a 0.7 scale factor to each of the three RGB components of the color to create a brighter version of the same color. Although brighter and darker are inverse operations, the results of a series of invocations of these two methods may be inconsistent because of rounding errors.

Parameters:

color - - the color to make brighter

Returns:

a new Color object, a brighter version of the color.

brighter

public static Color brighter(Color color,
                             double factor)

Creates a brighter version of this color, according to the provided factor.

This method applies an the scale factor to each of the three RGB components of the color to create a brighter version of the same color. Although brighter and darker are inverse operations, the results of a series of invocations of these two methods may be inconsistent because of rounding errors.

Parameters:

color - - the color to make brighter

factor - - the factor by which to make it brighter.

Returns:

a new Color object, a brighter version of the color.

darker

public static Color darker(Color color)

Creates a darker version of this color.

This method applies an arbitrary 0.7 scale factor to each of the three RGB components of the color to create a darker version of the same color. Although brighter and darker are inverse operations, the results of a series of invocations of these two methods may be inconsistent because of rounding errors.

Parameters:

color - - the color to make darker

Returns:

a new Color object,a darker version of this color.

darker

public static Color darker(Color color,
                           double factor)

Creates a darker version of this color, according to the provided factor.

This method applies an the scale factor to each of the three RGB components of the color to create a darker version of the same color. Although brighter and darker are inverse operations, the results of a series of invocations of these two methods may be inconsistent because of rounding errors.

Parameters:

color - - the color to make darker

factor - - the factor by whcih to make it darker.

Returns:

a new Color object,a darker version of the color.

findBackground

public static Color findBackground(Component comp)

Searchs the heirarchy tree of the component and finds the first non null background Color object. It will return EchoInstance.DEFAULT_BACKGROUND if no ancestor components have a background set, but in practice this is unlikely to be the case.

Parameters:

comp - - the component to start searching at

Returns:

- the background color of the component or its parents

findForeground

public static Color findForeground(Component comp)

Searchs the heirarchy tree of the component and finds the first non null foreground Color object. It will return EchoInstance.DEFAULT_FOREGROUND if no ancestor components have a background set, but in practice this is unlikely to be the case.

Parameters:

comp - - the component to start searching at

Returns:

- the foreground color of the component or its parents

invertColor

public static Color invertColor(Color color)

Returns the inversion of a color.

Parameters:

color - - the color to invert

Returns:

the inverted color

makeAwtColor

public static java.awt.Color makeAwtColor(Color echoColor,
                                          java.awt.Color defaultAwtColor)

Creates an java.awt.Color object from a nextapp.echo.Color object, or uses the default AWT if the echoColor object is null

Parameters:

echoColor - - the nextapp.echo.Color object to convert

defaultAwtColor - - the AWT color to use if the echoColor is null

Returns:

a new AWT color object

makeCSSColor

public static java.lang.String makeCSSColor(Color color)

Returns the Hex W3C CSS color string for a given color ie #rrggbb

Parameters:

color - - the color to convert to a W3C hex CSS string value

Returns:

the W3C hex CSS string value

writeCSSColor

public static void writeCSSColor(java.io.PrintWriter pw,
                                 Color color)

makeColorString

public static java.lang.String makeColorString(Color color)

Returns the Color in the form : color(r,g,b);

Parameters:

color - - the color to convert to a color string representation

Returns:

the color string representation

makeHexColor

public static java.lang.String makeHexColor(Color color)

Returns the Hex string for a given color for example 'rrggbb' Note it does NOT have the # character at the front

Parameters:

color - the color in question

Returns:

the string in the form rrggbb

makeColor

public static Color makeColor(java.lang.String colorString)

Returns a Color object from the string representation

The color string must be in the format :
- #rrggbb where rr, gg, bb are hexidecimal integer values
- rgb( r, g, b) where r,g,b are integer values
- color( r, g, b) where r,g,b are integer values
- null will return a null color

otherwise an IllegalArgumentException is thrown.

The results of these operations are cached in a static cache, so that Color objects can be re-used. This is okay since Color objects are immutable.

Parameters:

colorString - - the color string representation

Returns:

a new Color object

isColor

public static boolean isColor(java.lang.String colorString)

Returns true if the attrValue is a valid representation of a Color value.

The allowable forms are :

- colorconstant where colorconstant in (red,blue,green...) - #rrggbb where rr, gg, bb are hexidecimal integer values
- rgb( r, g, b) where r,g,b are integer values
- color( r, g, b) where r,g,b are integer values

clr

public static Color clr(java.lang.String colorString)

Shortcut synonym for makeColor(colorString);

See Also:

makeColor(String)

clr

public static Color clr(int r,
                        int g,
                        int b)

Shortcut synonym for makeColor(r,g,b);

See Also:

makeColor(int, int, int)

makeColor

public static Color makeColor(int r,
                              int g,
                              int b)

Returns a Color object from the red, green and blue integer values.

The results of these operations are cached in a static cache, so that Color objects can be re-used. This is okay since Color objects are immutable.

Parameters:

r - - the red color component

g - - the green color component

b - - the blue color component

Returns:

a new Color object

tint

public static Color tint(Color clr,
                         double red,
                         double green,
                         double blue)

Tints a given color by a factor given in red, blue and green.

The red, green and blue arguments should be around 1.0

swapRGB

public static Color swapRGB(Color swapColor,
                            int swapOperation)

This will swap the red/green/blue elements of a color according to the swapOperation, which may be one of :

• SWAP_OP_RBG
• SWAP_OP_BGR
• SWAP_OP_BRG
• SWAP_OP_GRB
• SWAP_OP_GBR

Parameters:

swapColor - - the color to swap the RGB elements

swapOperation - - the operation to perform

Returns:

- a new swapped Color or null if the swapColor was null.