1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.scenegraph.utils;
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14 import java.awt.Color;
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17 * @author Tuukka Lehtonen
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19 public class ColorUtil {
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22 * Blend two colors (AWT) by linearly interpolating between the specified
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23 * ratio (0-1). 0 means <code>src</code> color only and 1 means
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24 * <code>dst</code> color only.
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28 * @param ratio a value between [0,1]
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29 * @return a new instance of Color, containing the interpolated result.
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30 * Remember to dispose of this color when its no longer needed!
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32 public static Color blend(Color src, Color dst, double ratio) {
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33 if (ratio < 0 || ratio > 1)
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34 throw new IllegalArgumentException("expected t in [0,1], got t " + ratio);
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36 double r1 = src.getRed();
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37 double g1 = src.getGreen();
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38 double b1 = src.getBlue();
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39 double a1 = src.getAlpha();
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40 double r2 = dst.getRed();
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41 double g2 = dst.getGreen();
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42 double b2 = dst.getBlue();
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43 double a2 = dst.getAlpha();
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45 double r = r1 + (r2 - r1) * ratio;
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46 double g = g1 + (g2 - g1) * ratio;
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47 double b = b1 + (b2 - b1) * ratio;
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48 double a = a1 + (a2 - a1) * ratio;
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50 return new Color((int) r, (int) g, (int) b, (int) a);
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58 public static Color withAlpha(Color c, int alpha) {
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59 return new Color(c.getRed(), c.getGreen(), c.getBlue(), alpha);
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67 public static Color withAlpha(Color c, float alpha) {
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68 return withAlpha(c, (int) (255.0f * alpha));
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71 public static Color gamma(Color c, double y) {
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72 double oneOverGamma = 1.0D / y;
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74 int g = c.getGreen();
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75 int b = c.getBlue();
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76 r = (int) ( 255. * ( Math.pow( r / 255.0D, oneOverGamma ) + 0.5D ) );
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77 g = (int) ( 255. * ( Math.pow( g / 255.0D, oneOverGamma ) + 0.5D ) );
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78 b = (int) ( 255. * ( Math.pow( b / 255.0D, oneOverGamma ) + 0.5D ) );
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79 if ( r > 255 ) r = 255;
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80 if ( g > 255 ) g = 255;
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81 if ( b > 255 ) b = 255;
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83 return new Color(r, g, b, c.getAlpha());
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