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