Package org.eclipse.swt.graphics

Class RGBA

java.lang.Object
org.eclipse.swt.graphics.RGBA
public final class RGBA extends Object
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:
3.1
See Also:

  • 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:

    • 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

      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:

    • 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