Package org.eclipse.swt.graphics

Class RGBA

  • public final class RGBA
extends java.lang.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:
    Color

    • Field Summary

      Fields 
      Modifier and Type Field Description
      int alpha
      the alpha component of the RGBA
      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

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean equals​(java.lang.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.
      java.lang.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 Detail

      • rgb

        public final RGB rgb
        the RGB component of the RGBA

      • alpha

        public int alpha
        the alpha component of the RGBA

    • Constructor Detail

      • 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:
        java.lang.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:
        java.lang.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 Detail

      • 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​(java.lang.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 java.lang.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 java.lang.Object
        Returns:
        the receiver's hash
        See Also:
        equals(Object)

      • toString

        public java.lang.String toString()
        Returns a string containing a concise, human-readable description of the receiver.
        Overrides:
        toString in class java.lang.Object
        Returns:
        a string representation of the RGBA