/*******************************************************************************
* Copyright (c) 2007, 2010 Association for Decentralized Information Management
* in Industry THTH ry.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* VTT Technical Research Centre of Finland - initial API and implementation
*******************************************************************************/
package org.simantics.utils.ui.gfx;
import org.eclipse.swt.graphics.Color;
/**
* Utilities for dealing with SWT Color.
*
* @author Tuukka Lehtonen
*/
public class ColorUtils {
/*
* Blend two colors (SWT) by linearly interpolating between the specified ratio
* (0-1). 0 means src
color only and 1 means dst
* color only.
*
* @param src
* @param dst
* @param ratio a value between [0,1]
* @return a new instance of Color, containing the interpolated result.
* Remember to dispose of this color when its no longer needed!
*/
public static Color blend(Color src, Color dst, double ratio) {
if (ratio < 0 || ratio > 1)
throw new IllegalArgumentException("expected t in [0,1], got t " + ratio);
double r1 = src.getRed();
double g1 = src.getGreen();
double b1 = src.getBlue();
double r2 = dst.getRed();
double g2 = dst.getGreen();
double b2 = dst.getBlue();
double r = r1 + (r2 - r1) * ratio;
double g = g1 + (g2 - g1) * ratio;
double b = b1 + (b2 - b1) * ratio;
return new Color(src.getDevice(), (int) r, (int) g, (int) b);
}
/**
* Blend two colors (AWT) by linearly interpolating between the specified ratio
* (0-1). 0 means src
color only and 1 means dst
* color only.
*
* @param src
* @param dst
* @param ratio a value between [0,1]
* @return a new instance of Color, containing the interpolated result.
* Remember to dispose of this color when its no longer needed!
*/
public static java.awt.Color blend(java.awt.Color src, java.awt.Color dst, double ratio) {
if (ratio < 0 || ratio > 1)
throw new IllegalArgumentException("expected t in [0,1], got t " + ratio);
double r1 = src.getRed();
double g1 = src.getGreen();
double b1 = src.getBlue();
double a1 = src.getAlpha();
double r2 = dst.getRed();
double g2 = dst.getGreen();
double b2 = dst.getBlue();
double a2 = dst.getAlpha();
double r = r1 + (r2 - r1) * ratio;
double g = g1 + (g2 - g1) * ratio;
double b = b1 + (b2 - b1) * ratio;
double a = a1 + (a2 - a1) * ratio;
return new java.awt.Color((int) r, (int) g, (int) b, (int) a);
}
}