Class Color

public class Color
extends Object
implements Paint, Serializable

The Color class is used to encapsulate colors in the default sRGB color space or colors in arbitrary color spaces identified by a ColorSpace. Every color has an implicit alpha value of 1.0 or an explicit one provided in the constructor. The alpha value defines the transparency of a color and can be represented by a float value in the range 0.0 - 1.0 or 0 - 255. An alpha value of 1.0 or 255 means that the color is completely opaque and an alpha value of 0 or 0.0 means that the color is completely transparent. When constructing a Color with an explicit alpha or getting the color/alpha components of a Color, the color components are never premultiplied by the alpha component.

The default color space for the Java 2D(tm) API is sRGB, a proposed standard RGB color space. For further information on sRGB, see http://www.w3.org/pub/WWW/Graphics/Color/sRGB.html .

Fields

white

public static final Color white

The color white. In the default sRGB space.

WHITE

public static final Color WHITE

The color white. In the default sRGB space.

Since:

1.4

lightGray

public static final Color lightGray

The color light gray. In the default sRGB space.

LIGHT_GRAY

public static final Color LIGHT_GRAY

The color light gray. In the default sRGB space.

Since:

1.4

gray

public static final Color gray

The color gray. In the default sRGB space.

GRAY

public static final Color GRAY

The color gray. In the default sRGB space.

Since:

1.4

darkGray

public static final Color darkGray

The color dark gray. In the default sRGB space.

DARK_GRAY

public static final Color DARK_GRAY

The color dark gray. In the default sRGB space.

Since:

1.4

black

public static final Color black

The color black. In the default sRGB space.

BLACK

public static final Color BLACK

The color black. In the default sRGB space.

Since:

1.4

red

public static final Color red

The color red. In the default sRGB space.

RED

public static final Color RED

The color red. In the default sRGB space.

Since:

1.4

pink

public static final Color pink

The color pink. In the default sRGB space.

PINK

public static final Color PINK

The color pink. In the default sRGB space.

Since:

1.4

orange

public static final Color orange

The color orange. In the default sRGB space.

ORANGE

public static final Color ORANGE

The color orange. In the default sRGB space.

Since:

1.4

yellow

public static final Color yellow

The color yellow. In the default sRGB space.

YELLOW

public static final Color YELLOW

The color yellow. In the default sRGB space.

Since:

1.4

green

public static final Color green

The color green. In the default sRGB space.

GREEN

public static final Color GREEN

The color green. In the default sRGB space.

Since:

1.4

magenta

public static final Color magenta

The color magenta. In the default sRGB space.

MAGENTA

public static final Color MAGENTA

The color magenta. In the default sRGB space.

Since:

1.4

cyan

public static final Color cyan

The color cyan. In the default sRGB space.

CYAN

public static final Color CYAN

The color cyan. In the default sRGB space.

Since:

1.4

blue

public static final Color blue

The color blue. In the default sRGB space.

BLUE

public static final Color BLUE

The color blue. In the default sRGB space.

Since:

1.4

Constructors

Color

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

Creates an opaque sRGB color with the specified red, green, and blue values in the range (0 - 255). The actual color used in rendering depends on finding the best match given the color space available for a given output device. Alpha is defaulted to 255.

Parameters:

r - the red component

g - the green component

b - the blue component

Throws:

IllegalArgumentException - if r, g or b are outside of the range 0 to 255, inclusive

See Also:

getRed(), getGreen(), getBlue(), getRGB()

Color

@ConstructorProperties(value={"red","green","blue","alpha"})
public Color(int r,
                                                                          int g,
                                                                          int b,
                                                                          int a)

Creates an sRGB color with the specified red, green, blue, and alpha values in the range (0 - 255).

Parameters:

r - the red component

g - the green component

b - the blue component

a - the alpha component

Throws:

IllegalArgumentException - if r, g, b or a are outside of the range 0 to 255, inclusive

See Also:

getRed(), getGreen(), getBlue(), getAlpha(), getRGB()

Color

public Color(int rgb)

Creates an opaque sRGB color with the specified combined RGB value consisting of the red component in bits 16-23, the green component in bits 8-15, and the blue component in bits 0-7. The actual color used in rendering depends on finding the best match given the color space available for a particular output device. Alpha is defaulted to 255.

Parameters:

rgb - the combined RGB components

See Also:

ColorModel.getRGBdefault(), getRed(), getGreen(), getBlue(), getRGB()

Color

public Color(int rgba,
             boolean hasalpha)

Creates an sRGB color with the specified combined RGBA value consisting of the alpha component in bits 24-31, the red component in bits 16-23, the green component in bits 8-15, and the blue component in bits 0-7. If the hasalpha argument is false, alpha is defaulted to 255.

Parameters:

rgba - the combined RGBA components

hasalpha - true if the alpha bits are valid; false otherwise

See Also:

ColorModel.getRGBdefault(), getRed(), getGreen(), getBlue(), getAlpha(), getRGB()

Color

public Color(float r,
             float g,
             float b)

Creates an opaque sRGB color with the specified red, green, and blue values in the range (0.0 - 1.0). Alpha is defaulted to 1.0. The actual color used in rendering depends on finding the best match given the color space available for a particular output device.

Parameters:

r - the red component

g - the green component

b - the blue component

Throws:

IllegalArgumentException - if r, g or b are outside of the range 0.0 to 1.0, inclusive

See Also:

getRed(), getGreen(), getBlue(), getRGB()

Color

public Color(float r,
             float g,
             float b,
             float a)

Creates an sRGB color with the specified red, green, blue, and alpha values in the range (0.0 - 1.0). The actual color used in rendering depends on finding the best match given the color space available for a particular output device.

Parameters:

r - the red component

g - the green component

b - the blue component

a - the alpha component

Throws:

IllegalArgumentException - if r, g b or a are outside of the range 0.0 to 1.0, inclusive

See Also:

getRed(), getGreen(), getBlue(), getAlpha(), getRGB()

Color

public Color(ColorSpace cspace,
             float[] components,
             float alpha)

Creates a color in the specified ColorSpace with the color components specified in the float array and the specified alpha. The number of components is determined by the type of the ColorSpace. For example, RGB requires 3 components, but CMYK requires 4 components.

Parameters:

cspace - the ColorSpace to be used to interpret the components

components - an arbitrary number of color components that is compatible with the ColorSpace

alpha - alpha value

Throws:

IllegalArgumentException - if any of the values in the components array or alpha is outside of the range 0.0 to 1.0

See Also:

getComponents(float[]), getColorComponents(float[])

Methods

getRed

public int getRed()

Returns the red component in the range 0-255 in the default sRGB space.

Returns:

the red component.

See Also:

getRGB()

getGreen

public int getGreen()

Returns the green component in the range 0-255 in the default sRGB space.

Returns:

the green component.

See Also:

getRGB()

getBlue

public int getBlue()

Returns the blue component in the range 0-255 in the default sRGB space.

Returns:

the blue component.

See Also:

getRGB()

getAlpha

public int getAlpha()

Returns the alpha component in the range 0-255.

Returns:

the alpha component.

See Also:

getRGB()

getRGB

public int getRGB()

Returns the RGB value representing the color in the default sRGB ColorModel. (Bits 24-31 are alpha, 16-23 are red, 8-15 are green, 0-7 are blue).

Returns:

the RGB value of the color in the default sRGB ColorModel.

Since:

JDK1.0

See Also:

ColorModel.getRGBdefault(), getRed(), getGreen(), getBlue()

brighter

public Color brighter()

Returns:

a new Color object that is a brighter version of this Color with the same alpha value.

Since:

JDK1.0

See Also:

darker()

darker

public Color darker()

Returns:

a new Color object that is a darker version of this Color with the same alpha value.

Since:

JDK1.0

See Also:

brighter()

hashCode

public int hashCode()

Computes the hash code for this Color.

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

Since:

JDK1.0

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

Parameters:

obj - the object to test for equality with this Color

Returns:

true if the objects are the same; false otherwise.

Since:

JDK1.0

See Also:

Object.hashCode(), HashMap

toString

public String toString()

Returns a string representation of this Color. This method is intended to be used only for debugging purposes. The content and format of the returned string might vary between implementations. The returned string might be empty but cannot be null.

Overrides:

toString in class Object

Returns:

a string representation of this Color.

decode

public static Color decode(String nm)
                    throws NumberFormatException

Converts a String to an integer and returns the specified opaque Color. This method handles string formats that are used to represent octal and hexadecimal numbers.

Parameters:

nm - a String that represents an opaque color as a 24-bit integer

Returns:

the new Color object.

Throws:

NumberFormatException - if the specified string cannot be interpreted as a decimal, octal, or hexadecimal integer.

Since:

JDK1.1

See Also:

Integer.decode(java.lang.String)

getColor

public static Color getColor(String nm)

Parameters:

nm - the name of the color property

Returns:

the Color converted from the system property.

Since:

JDK1.0

See Also:

System.getProperty(java.lang.String), Integer.getInteger(java.lang.String), Color(int)

getColor

public static Color getColor(String nm,
                             Color v)

Parameters:

nm - the name of the color property

v - the default Color

Returns:

the Color converted from the system property, or the specified Color.

Since:

JDK1.0

See Also:

System.getProperty(java.lang.String), Integer.getInteger(java.lang.String), Color(int)

getColor

public static Color getColor(String nm,
                             int v)

Parameters:

nm - the name of the color property

v - the default color value, as an integer

Returns:

the Color converted from the system property or the Color converted from the specified integer.

Since:

JDK1.0

See Also:

System.getProperty(java.lang.String), Integer.getInteger(java.lang.String), Color(int)

HSBtoRGB

public static int HSBtoRGB(float hue,
                           float saturation,
                           float brightness)

Parameters:

hue - the hue component of the color

saturation - the saturation of the color

brightness - the brightness of the color

Returns:

the RGB value of the color with the indicated hue, saturation, and brightness.

Since:

JDK1.0

See Also:

getRGB(), Color(int), ColorModel.getRGBdefault()

RGBtoHSB

public static float[] RGBtoHSB(int r,
                               int g,
                               int b,
                               float[] hsbvals)

Parameters:

r - the red component of the color

g - the green component of the color

b - the blue component of the color

hsbvals - the array used to return the three HSB values, or null

Returns:

an array of three elements containing the hue, saturation, and brightness (in that order), of the color with the indicated red, green, and blue components.

Since:

JDK1.0

See Also:

getRGB(), Color(int), ColorModel.getRGBdefault()

getHSBColor

public static Color getHSBColor(float h,
                                float s,
                                float b)

Parameters:

h - the hue component

s - the saturation of the color

b - the brightness of the color

Returns:

a Color object with the specified hue, saturation, and brightness.

Since:

JDK1.0

getRGBComponents

public float[] getRGBComponents(float[] compArray)

Returns a float array containing the color and alpha components of the Color, as represented in the default sRGB color space. If compArray is null, an array of length 4 is created for the return value. Otherwise, compArray must have length 4 or greater, and it is filled in with the components and returned.

Parameters:

compArray - an array that this method fills with color and alpha components and returns

Returns:

the RGBA components in a float array.

getRGBColorComponents

public float[] getRGBColorComponents(float[] compArray)

Returns a float array containing only the color components of the Color, in the default sRGB color space. If compArray is null, an array of length 3 is created for the return value. Otherwise, compArray must have length 3 or greater, and it is filled in with the components and returned.

Parameters:

compArray - an array that this method fills with color components and returns

Returns:

the RGB components in a float array.

getComponents

public float[] getComponents(float[] compArray)

Returns a float array containing the color and alpha components of the Color, in the ColorSpace of the Color. If compArray is null, an array with length equal to the number of components in the associated ColorSpace plus one is created for the return value. Otherwise, compArray must have at least this length and it is filled in with the components and returned.

Parameters:

compArray - an array that this method fills with the color and alpha components of this Color in its ColorSpace and returns

Returns:

the color and alpha components in a float array.

getColorComponents

public float[] getColorComponents(float[] compArray)

Returns a float array containing only the color components of the Color, in the ColorSpace of the Color. If compArray is null, an array with length equal to the number of components in the associated ColorSpace is created for the return value. Otherwise, compArray must have at least this length and it is filled in with the components and returned.

Parameters:

compArray - an array that this method fills with the color components of this Color in its ColorSpace and returns

Returns:

the color components in a float array.

getComponents

public float[] getComponents(ColorSpace cspace,
                             float[] compArray)

Returns a float array containing the color and alpha components of the Color, in the ColorSpace specified by the cspace parameter. If compArray is null, an array with length equal to the number of components in cspace plus one is created for the return value. Otherwise, compArray must have at least this length, and it is filled in with the components and returned.

Parameters:

cspace - a specified ColorSpace

compArray - an array that this method fills with the color and alpha components of this Color in the specified ColorSpace and returns

Returns:

the color and alpha components in a float array.

getColorComponents

public float[] getColorComponents(ColorSpace cspace,
                                  float[] compArray)

Returns a float array containing only the color components of the Color in the ColorSpace specified by the cspace parameter. If compArray is null, an array with length equal to the number of components in cspace is created for the return value. Otherwise, compArray must have at least this length, and it is filled in with the components and returned.

Parameters:

cspace - a specified ColorSpace

compArray - an array that this method fills with the color components of this Color in the specified ColorSpace

Returns:

the color components in a float array.

getColorSpace

public ColorSpace getColorSpace()

Returns the ColorSpace of this Color.

Returns:

this Color object's ColorSpace.

createContext

public PaintContext createContext(ColorModel cm,
                                  Rectangle r,
                                  Rectangle2D r2d,
                                  AffineTransform xform,
                                  RenderingHints hints)

Creates and returns a PaintContext used to generate a solid color field pattern. See the specification of the method in the Paint interface for information on null parameter handling.

Specified by:

createContext in interface Paint

Parameters:

cm - the preferred ColorModel which represents the most convenient format for the caller to receive the pixel data, or null if there is no preference.

r - the device space bounding box of the graphics primitive being rendered.

r2d - the user space bounding box of the graphics primitive being rendered.

xform - the AffineTransform from user space into device space.

hints - the set of hints that the context object can use to choose between rendering alternatives.

Returns:

the PaintContext for generating color patterns.

See Also:

Paint, PaintContext, ColorModel, Rectangle, Rectangle2D, AffineTransform, RenderingHints

getTransparency

public int getTransparency()

Returns the transparency mode for this Color. This is required to implement the Paint interface.

Specified by:

getTransparency in interface Transparency

Returns:

this Color object's transparency mode.

See Also:

Paint, Transparency, createContext(java.awt.image.ColorModel, java.awt.Rectangle, java.awt.geom.Rectangle2D, java.awt.geom.AffineTransform, java.awt.RenderingHints)