Package org.eclipse.swt.graphics

Class RGBA

java.lang.Object

org.eclipse.swt.graphics.RGBA

All Implemented Interfaces:

Serializable

public final class RGBA
extends Object
implements Serializable

Instances of this class are descriptions of colors in terms of the primary additive color model (red, green, blue and alpha). A color may be described in terms of the relative intensities of these three primary colors. The brightness of each color is specified by a value in the range 0 to 255, where 0 indicates no color (blackness) and 255 indicates maximum intensity and for alpha 0 indicates transparent and 255 indicates opaque.

The hashCode() method in this class uses the values of the public fields to compute the hash value. When storing instances of the class in hashed collections, do not modify these fields after the object has been inserted.

Application code does not need to explicitly release the resources managed by each instance when those instances are no longer required, and thus no dispose() method is provided.

Since:

3.104

See Also:

• Color
• Color and RGB snippets
• Sample code and further information
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
int	alpha	the alpha component of the RGBA
final RGB	rgb	the RGB component of the RGBA

Constructor Summary

Constructors

Constructor	Description
RGBA(float hue, float saturation, float brightness, float alpha)	Constructs an instance of this class with the given hue, saturation, and brightness.
RGBA(int red, int green, int blue, int alpha)	Constructs an instance of this class with the given red, green, blue and alpha values.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object object)	Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.
float[]	getHSBA()	Returns the hue, saturation, and brightness of the color.
int	hashCode()	Returns an integer hash code for the receiver.
String	toString()	Returns a string containing a concise, human-readable description of the receiver.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

rgb

public final RGB rgb

the RGB component of the RGBA

alpha

public int alpha

the alpha component of the RGBA

Constructor Details

RGBA

public RGBA(int red,
 int green,
 int blue,
 int alpha)

Constructs an instance of this class with the given red, green, blue and alpha values.

Parameters:

red - the red component of the new instance

green - the green component of the new instance

blue - the blue component of the new instance

alpha - the alpha component of the new instance

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the red, green, blue or alpha argument is not between 0 and 255

RGBA

public RGBA(float hue,
 float saturation,
 float brightness,
 float alpha)

Constructs an instance of this class with the given hue, saturation, and brightness.

Parameters:

hue - the hue value for the HSBA color (from 0 to 360)

saturation - the saturation value for the HSBA color (from 0 to 1)

brightness - the brightness value for the HSBA color (from 0 to 1)

alpha - the alpha value for the HSBA color (from 0 to 255)

Throws:

IllegalArgumentException -

• ERROR_INVALID_ARGUMENT - if the hue is not between 0 and 360 or the saturation or brightness is not between 0 and 1 or if the alpha is not between 0 and 255

Method Details

getHSBA

public float[] getHSBA()

Returns the hue, saturation, and brightness of the color.

Returns:

color space values in float format:

• hue (from 0 to 360)
• saturation (from 0 to 1)
• brightness (from 0 to 1)
• alpha (from 0 to 255)

See Also:

• RGBA(float, float, float, float)

equals

public boolean equals(Object object)

Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison.

Overrides:

equals in class Object

Parameters:

object - the object to compare with this object

Returns:

true if the object is the same as this object and false otherwise

See Also:

• hashCode()

hashCode

public int hashCode()

Returns an integer hash code for the receiver. Any two objects that return true when passed to equals must return the same value for this method.

Overrides:

hashCode in class Object

Returns:

the receiver's hash

See Also:

• equals(Object)

toString

public String toString()

Returns a string containing a concise, human-readable description of the receiver.

Overrides:

toString in class Object

Returns:

a string representation of the RGBA