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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.graphics;
import org.eclipse.swt.internal.SerializableCompatibility;
import org.eclipse.swt.*;
/**
* Instances of this class are descriptions of colors in
* terms of the primary additive color model (red, green and
* blue). 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.
* <p>
* Application code does <em>not</em> need to explicitly release the
* resources managed by each instance when those instances are no longer
* required, and thus no <code>dispose()</code> method is provided.
* </p>
*
* @see Color
*/
public final class RGB implements SerializableCompatibility {
/**
* the red component of the RGB
*/
public int red;
/**
* the green component of the RGB
*/
public int green;
/**
* the blue component of the RGB
*/
public int blue;
/**
* Constructs an instance of this class with the given
* red, green and blue values.
*
* @param red the red component of the new instance
* @param green the green component of the new instance
* @param blue the blue component of the new instance
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
* </ul>
*/
public RGB(int red, int green, int blue) {
if ((red > 255) || (red < 0) ||
(green > 255) || (green < 0) ||
(blue > 255) || (blue < 0))
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
this.red = red;
this.green = green;
this.blue = blue;
}
/**
* Compares the argument to the receiver, and returns true
* if they represent the <em>same</em> object using a class
* specific comparison.
*
* @param object the object to compare with this object
* @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
*
* @see #hashCode
*/
public boolean equals (Object object) {
if (object == this) return true;
if (!(object instanceof RGB)) return false;
RGB rgb = (RGB)object;
return (rgb.red == this.red) && (rgb.green == this.green) && (rgb.blue == this.blue);
}
/**
* Returns an integer hash code for the receiver. Any two
* objects which return <code>true</code> when passed to
* <code>equals</code> must return the same value for this
* method.
*
* @return the receiver's hash
*
* @see #equals
*/
public int hashCode () {
return (blue << 16) | (green << 8) | red;
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the <code>RGB</code>
*/
public String toString () {
return "RGB {" + red + ", " + green + ", " + blue + "}"; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
}
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