colorrgba.java

java 3d game jme 工程开发源代码

/*
 * Copyright (c) 2003-2009 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jme.renderer;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

import com.jme.math.FastMath;
import com.jme.util.export.InputCapsule;
import com.jme.util.export.JMEExporter;
import com.jme.util.export.JMEImporter;
import com.jme.util.export.OutputCapsule;
import com.jme.util.export.Savable;

/**
 * <code>ColorRGBA</code> defines a color made from a collection of
 * red, green and blue values. An alpha value determines is transparency.
 * All values must be between 0 and 1. If any value is set higher or lower
 * than these constraints they are clamped to the min or max. That is, if
 * a value smaller than zero is set the value clamps to zero. If a value
 * higher than 1 is passed, that value is clamped to 1. However, because the
 * attributes r, g, b, a are public for efficiency reasons, they can be
 * directly modified with invalid values. The client should take care when
 * directly addressing the values. A call to clamp will assure that the values
 * are within the constraints.
 * @author Mark Powell
 * @version $Id: ColorRGBA.java,v 1.29 2007/09/09 18:25:14 irrisor Exp $
 */
public class ColorRGBA implements Externalizable, Savable, Cloneable {

    private static final long serialVersionUID = 1L;
    /**
     * the color black (0,0,0).
     */
    public static final ColorRGBA black = new ColorRGBA(0f, 0f, 0f, 1f);
    /**
     * the color white (1,1,1).
     */
    public static final ColorRGBA white = new ColorRGBA(1f, 1f, 1f, 1f);
    /**
     * the color gray (.2,.2,.2).
     */
    public static final ColorRGBA darkGray = new ColorRGBA(0.2f, 0.2f, 0.2f, 1.0f);
    /**
     * the color gray (.5,.5,.5).
     */
    public static final ColorRGBA gray = new ColorRGBA(0.5f, 0.5f, 0.5f, 1.0f);
    /**
     * the color gray (.8,.8,.8).
     */
    public static final ColorRGBA lightGray = new ColorRGBA(0.8f, 0.8f, 0.8f, 1.0f);
    /**
     * the color red (1,0,0).
     */
    public static final ColorRGBA red = new ColorRGBA(1f, 0f, 0f, 1f);
    /**
     * the color green (0,1,0).
     */
    public static final ColorRGBA green = new ColorRGBA(0f, 1f, 0f, 1f);
    /**
     * the color blue (0,0,1).
     */
    public static final ColorRGBA blue = new ColorRGBA(0f, 0f, 1f, 1f);
    /**
     * the color yellow (1,1,0).
     */
    public static final ColorRGBA yellow = new ColorRGBA(1f, 1f, 0f, 1f);
    /**
     * the color magenta (1,0,1).
     */
    public static final ColorRGBA magenta = new ColorRGBA(1f, 0f, 1f, 1f);
    /**
     * the color cyan (0,1,1).
     */
    public static final ColorRGBA cyan = new ColorRGBA(0f, 1f, 1f, 1f);
    /**
     * the color orange (251/255, 130/255,0).
     */
    public static final ColorRGBA orange = new ColorRGBA(251f/255f, 130f/255f, 0f, 1f);
    /**
     * the color brown (65/255, 40/255, 25/255).
     */
    public static final ColorRGBA brown = new ColorRGBA(65f/255f, 40f/255f, 25f/255f, 1f);
    /**
     * the color pink (1, 0.68, 0.68).
     */
    public static final ColorRGBA pink = new ColorRGBA(1f, 0.68f, 0.68f, 1f);

    /**
     * The red component of the color.
     */
    public float r;
    /**
     * The green component of the color.
     */
    public float g;
    /**
     * the blue component of the color.
     */
    public float b;
    /**
     * the alpha component of the color.  0 is transparent and 1 is opaque
     */
    public float a;

    /**
     * Constructor instantiates a new <code>ColorRGBA</code> object. This
     * color is the default "white" with all values 1.
     *
     */
    public ColorRGBA() {
        r = g = b = a = 1.0f;
    }

    /**
     * Constructor instantiates a new <code>ColorRGBA</code> object. The
     * values are defined as passed parameters. These values are then clamped
     * to insure that they are between 0 and 1.
     * @param r the red component of this color.
     * @param g the green component of this color.
     * @param b the blue component of this color.
     * @param a the alpha component of this color.
     */
    public ColorRGBA(float r, float g, float b, float a) {
      this.r = r;
      this.g = g;
      this.b = b;
      this.a = a;
//      clamp();
    }

    /**
     * Copy constructor creates a new <code>ColorRGBA</code> object, based on
     * a provided color.
     * @param rgba the <code>ColorRGBA</code> object to copy.
     */
    public ColorRGBA(ColorRGBA rgba) {
        this.a = rgba.a;
        this.r = rgba.r;
        this.g = rgba.g;
        this.b = rgba.b;
//        clamp();
    }

    /**
     *
     * <code>set</code> sets the RGBA values of this color. The values are then
     * clamped to insure that they are between 0 and 1.
     *
     * @param r the red component of this color.
     * @param g the green component of this color.
     * @param b the blue component of this color.
     * @param a the alpha component of this color.
     */
    public void set(float r, float g, float b, float a) {
      this.r = r;
      this.g = g;
      this.b = b;
      this.a = a;
//      clamp();
    }

    /**
     * <code>set</code> sets the values of this color to those set by a parameter
     * color.
     *
     * @param rgba ColorRGBA the color to set this color to.
     * @return this
     */
    public ColorRGBA set(ColorRGBA rgba) {
      if(rgba == null) {
          r = 0;
          g = 0;
          b = 0;
          a = 0;
      } else {
          r = rgba.r;
          g = rgba.g;
          b = rgba.b;
          a = rgba.a;
      }
        return this;
    }

    /**
     * <code>clamp</code> insures that all values are between 0 and 1. If any
     * are less than 0 they are set to zero. If any are more than 1 they are
     * set to one.
     *
     */
    public void clamp() {
        if (r < 0) {
            r = 0;
        } else if (r > 1) {
            r = 1;
        }

        if (g < 0) {
            g = 0;
        } else if (g > 1) {
            g = 1;
        }

        if (b < 0) {
            b = 0;
        } else if (b > 1) {
            b = 1;
        }

        if (a < 0) {
            a = 0;
        } else if (a > 1) {
            a = 1;
        }
    }

    /**
     *
     * <code>getColorArray</code> retrieves the color values of this object as
     * a four element float array.
     * @return the float array that contains the color elements.
     */
    public float[] getColorArray() {
        return new float[] {r,g,b,a};
    }

    /**