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java.awt
Class Color
java.lang.Object
java.awt.Color
-
All Implemented Interfaces:
-
Paint
,
Transparency
,
Serializable
-
Direct Known Subclasses:
-
ColorUIResource
,
SystemColor
-
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
.
-
See Also:
-
ColorSpace
,
AlphaComposite
,
Serialized Form
Constructor Summary
|
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. |
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). |
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). |
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. |
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. |
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). |
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). |
Method Summary
|
Color
|
brighter
()
Creates a new Color that is a brighter version of this Color. |
PaintContext
|
createContext
(
ColorModel
cm,
Rectangle
r,
Rectangle2D
r2d,
AffineTransform
xform,
RenderingHints
hints)
Creates and returns a
PaintContext
used to generate a solid color pattern. |
Color
|
darker
()
Creates a new Color that is a darker version of this Color. |
static
Color
|
decode
(
String
nm)
Converts a String to an integer and returns the specified opaque Color. |
boolean |
equals
(
Object
obj)
Determines whether another object is equal to this Color. |
int |
getAlpha
()
Returns the alpha component in the range 0-255. |
int |
getBlue
()
Returns the blue component in the range 0-255 in the default sRGB space. |
static
Color
|
getColor
(
String
nm)
Finds a color in the system properties. |
static
Color
|
getColor
(
String
nm,
Color
v)
Finds a color in the system properties. |
static
Color
|
getColor
(
String
nm, int v)
Finds a color in the system properties. |
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. |
float[] |
getColorComponents
(float[] compArray)
Returns a float array containing only the color components of the Color, in the ColorSpace of the Color. |
ColorSpace
|
getColorSpace
()
Returns the ColorSpace of this Color. |
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. |
float[] |
getComponents
(float[] compArray)
Returns a float array containing the color and alpha components of the Color, in the ColorSpace of the Color. |
int |
getGreen
()
Returns the green component in the range 0-255 in the default sRGB space. |
static
Color
|
getHSBColor
(float h, float s, float b)
Creates a Color object based on the specified values for the HSB color model. |
int |
getRed
()
Returns the red component in the range 0-255 in the default sRGB space. |
int |
getRGB
()
Returns the RGB value representing the color in the default sRGB
ColorModel
. |
float[] |
getRGBColorComponents
(float[] compArray)
Returns a float array containing only the color components of the Color, in the default sRGB color space. |
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. |
int |
getTransparency
()
Returns the transparency mode for this Color. |
int |
hashCode
()
Computes the hash code for this Color. |
static int |
HSBtoRGB
(float hue, float saturation, float brightness)
Converts the components of a color, as specified by the HSB model, to an equivalent set of values for the default RGB model. |
static float[] |
RGBtoHSB
(int r, int g, int b, float[] hsbvals)
Converts the components of a color, as specified by the default RGB model, to an equivalent set of values for hue, saturation, and brightness that are the three components of the HSB model. |
String
|
toString
()
Returns a string representation of this Color. |
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
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
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[])
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()
-
Creates a new Color that is a brighter version of this Color.
This method applies an arbitrary scale factor to each of the three RGB components of this Color to create a brighter version of this Color. Although brighter and darker are inverse operations, the results of a series of invocations of these two methods might be inconsistent because of rounding errors.
-
-
-
Returns:
-
a new Color object that is a brighter version of this Color.
-
Since:
-
JDK1.0
-
See Also:
-
darker()
darker
public Color darker()
-
Creates a new Color that is a darker version of this Color.
This method applies an arbitrary scale factor to each of the three RGB components of this Color to create a darker version of this Color. Although brighter and darker are inverse operations, the results of a series of invocations of these two methods might be inconsistent because of rounding errors.
-
-
-
Returns:
-
a new Color object that is a darker version of this Color.
-
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)
,
Hashtable
equals
public boolean equals(Object obj)
-
Determines whether another object is equal to this Color.
The result is true if and only if the argument is not null and is a Color object that has the same red, green, blue, and alpha values as this object.
-
-
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()
,
Hashtable
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 hexidecimal 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 hexidecimal integer.
-
Since:
-
JDK1.1
-
See Also:
-
Integer.decode(java.lang.String)
getColor
public static Color getColor(String nm)
-
Finds a color in the system properties.
The argument is treated as the name of a system property to be obtained. The string value of this property is then interpreted as an integer which is then converted to a Color object.
If the specified property is not found or could not be parsed as an integer then null is returned.
-
-
-
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)
-
Finds a color in the system properties.
The first argument is treated as the name of a system property to be obtained. The string value of this property is then interpreted as an integer which is then converted to a Color object.
If the specified property is not found or cannot be parsed as an integer then the Color specified by the second argument is returned instead.
-
-
-
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)
-
Finds a color in the system properties.
The first argument is treated as the name of a system property to be obtained. The string value of this property is then interpreted as an integer which is then converted to a Color object.
If the specified property is not found or could not be parsed as an integer then the integer value v is used instead, and is converted to a Color object.
-
-
-
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)
-
Converts the components of a color, as specified by the HSB model, to an equivalent set of values for the default RGB model.
The saturation and brightness components should be floating-point values between zero and one (numbers in the range 0.0-1.0). The hue component can be any floating-point number. The floor of this number is subtracted from it to create a fraction between 0 and 1. This fractional number is then multiplied by 360 to produce the hue angle in the HSB color model.
The integer that is returned by HSBtoRGB encodes the value of a color in bits 0-23 of an integer value that is the same format used by the method
getRGB
. This integer can be supplied as an argument to the Color constructor that takes a single integer argument.
-
-
-
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)
-
Converts the components of a color, as specified by the default RGB model, to an equivalent set of values for hue, saturation, and brightness that are the three components of the HSB model.
If the hsbvals argument is null, then a new array is allocated to return the result. Otherwise, the method returns the array hsbvals, with the values put into that array.
-
-
-
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)
-
Creates a Color object based on the specified values for the HSB color model.
The s and b components should be floating-point values between zero and one (numbers in the range 0.0-1.0). The h component can be any floating-point number. The floor of this number is subtracted from it to create a fraction between 0 and 1. This fractional number is then multiplied by 360 to produce the hue angle in the HSB color model.
-
-
-
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 pattern. This enables a Color object to be used as an argument to any method requiring an object implementing the
Paint
interface. The same PaintContext is returned, regardless of whether or not r, r2d, xform, or hints are null.
-
-
Specified by:
-
createContext
in interface
Paint
-
-
Parameters:
-
cm - the specified ColorModel
-
r - the specified
Rectangle
-
r2d - the specified
Rectangle2D
-
xform - the specified
AffineTransform
-
hints - the specified
RenderingHints
-
Returns:
-
a PaintContext that is used to generate a solid color pattern.
-
See Also:
-
Paint
,
PaintContext
,
Graphics2D.setPaint(java.awt.Paint)
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)