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.utils.ui.gfx;
14 import org.eclipse.swt.graphics.Color;
17 * Utilities for dealing with SWT Color.
19 * @author Tuukka Lehtonen
21 public class ColorUtils {
24 * Blend two colors (SWT) by linearly interpolating between the specified ratio
25 * (0-1). 0 means <code>src</code> color only and 1 means <code>dst</code>
30 * @param ratio a value between [0,1]
31 * @return a new instance of Color, containing the interpolated result.
32 * Remember to dispose of this color when its no longer needed!
34 public static Color blend(Color src, Color dst, double ratio) {
35 if (ratio < 0 || ratio > 1)
36 throw new IllegalArgumentException("expected t in [0,1], got t " + ratio);
38 double r1 = src.getRed();
39 double g1 = src.getGreen();
40 double b1 = src.getBlue();
41 double r2 = dst.getRed();
42 double g2 = dst.getGreen();
43 double b2 = dst.getBlue();
45 double r = r1 + (r2 - r1) * ratio;
46 double g = g1 + (g2 - g1) * ratio;
47 double b = b1 + (b2 - b1) * ratio;
49 return new Color(src.getDevice(), (int) r, (int) g, (int) b);
53 * Blend two colors (AWT) by linearly interpolating between the specified ratio
54 * (0-1). 0 means <code>src</code> color only and 1 means <code>dst</code>
59 * @param ratio a value between [0,1]
60 * @return a new instance of Color, containing the interpolated result.
61 * Remember to dispose of this color when its no longer needed!
63 public static java.awt.Color blend(java.awt.Color src, java.awt.Color dst, double ratio) {
64 if (ratio < 0 || ratio > 1)
65 throw new IllegalArgumentException("expected t in [0,1], got t " + ratio);
67 double r1 = src.getRed();
68 double g1 = src.getGreen();
69 double b1 = src.getBlue();
70 double a1 = src.getAlpha();
71 double r2 = dst.getRed();
72 double g2 = dst.getGreen();
73 double b2 = dst.getBlue();
74 double a2 = dst.getAlpha();
76 double r = r1 + (r2 - r1) * ratio;
77 double g = g1 + (g2 - g1) * ratio;
78 double b = b1 + (b2 - b1) * ratio;
79 double a = a1 + (a2 - a1) * ratio;
81 return new java.awt.Color((int) r, (int) g, (int) b, (int) a);