1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.scenegraph.utils;
14 import java.awt.Color;
17 * @author Tuukka Lehtonen
19 public class ColorUtil {
22 * Blend two colors (AWT) by linearly interpolating between the specified
23 * ratio (0-1). 0 means <code>src</code> color only and 1 means
24 * <code>dst</code> color only.
28 * @param ratio a value between [0,1]
29 * @return a new instance of Color, containing the interpolated result.
30 * Remember to dispose of this color when its no longer needed!
32 public static Color blend(Color src, Color dst, double ratio) {
33 if (ratio < 0 || ratio > 1)
34 throw new IllegalArgumentException("expected t in [0,1], got t " + ratio);
36 double r1 = src.getRed();
37 double g1 = src.getGreen();
38 double b1 = src.getBlue();
39 double a1 = src.getAlpha();
40 double r2 = dst.getRed();
41 double g2 = dst.getGreen();
42 double b2 = dst.getBlue();
43 double a2 = dst.getAlpha();
45 double r = r1 + (r2 - r1) * ratio;
46 double g = g1 + (g2 - g1) * ratio;
47 double b = b1 + (b2 - b1) * ratio;
48 double a = a1 + (a2 - a1) * ratio;
50 return new Color((int) r, (int) g, (int) b, (int) a);
58 public static Color withAlpha(Color c, int alpha) {
59 return new Color(c.getRed(), c.getGreen(), c.getBlue(), alpha);
67 public static Color withAlpha(Color c, float alpha) {
68 return withAlpha(c, (int) (255.0f * alpha));
71 public static Color gamma(Color c, double y) {
72 double oneOverGamma = 1.0D / y;
76 r = (int) ( 255. * ( Math.pow( r / 255.0D, oneOverGamma ) + 0.5D ) );
77 g = (int) ( 255. * ( Math.pow( g / 255.0D, oneOverGamma ) + 0.5D ) );
78 b = (int) ( 255. * ( Math.pow( b / 255.0D, oneOverGamma ) + 0.5D ) );
79 if ( r > 255 ) r = 255;
80 if ( g > 255 ) g = 255;
81 if ( b > 255 ) b = 255;
83 return new Color(r, g, b, c.getAlpha());
86 public static Color hexColor(String hex) {
87 if(hex.startsWith("#")) {
88 if(hex.length() == 4) {
89 int r = Character.digit(hex.charAt(1), 16);
90 int g = Character.digit(hex.charAt(2), 16);
91 int b = Character.digit(hex.charAt(3), 16);
92 return new Color(r+(r<<4), g+(g<<4), b+(b<<4));
93 } else if(hex.length() == 7) {
94 return new Color(Integer.parseInt(hex.substring(1), 16));