/*******************************************************************************
* 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.scenegraph.utils;
import java.awt.Color;
/**
* @author Tuukka Lehtonen
*/
public class ColorUtil {
/**
* 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 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 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 Color((int) r, (int) g, (int) b, (int) a);
}
/**
* @param c
* @param alpha
* @return
*/
public static Color withAlpha(Color c, int alpha) {
return new Color(c.getRed(), c.getGreen(), c.getBlue(), alpha);
}
/**
* @param c
* @param alpha
* @return
*/
public static Color withAlpha(Color c, float alpha) {
return withAlpha(c, (int) (255.0f * alpha));
}
public static Color gamma(Color c, double y) {
double oneOverGamma = 1.0D / y;
int r = c.getRed();
int g = c.getGreen();
int b = c.getBlue();
r = (int) ( 255. * ( Math.pow( r / 255.0D, oneOverGamma ) + 0.5D ) );
g = (int) ( 255. * ( Math.pow( g / 255.0D, oneOverGamma ) + 0.5D ) );
b = (int) ( 255. * ( Math.pow( b / 255.0D, oneOverGamma ) + 0.5D ) );
if ( r > 255 ) r = 255;
if ( g > 255 ) g = 255;
if ( b > 255 ) b = 255;
return new Color(r, g, b, c.getAlpha());
}
public static Color hexColor(String hex) {
if(hex.startsWith("#")) {
if(hex.length() == 4) {
int r = Character.digit(hex.charAt(1), 16);
int g = Character.digit(hex.charAt(2), 16);
int b = Character.digit(hex.charAt(3), 16);
return new Color(r+(r<<4), g+(g<<4), b+(b<<4));
} else if(hex.length() == 7) {
return new Color(Integer.parseInt(hex.substring(1), 16));
}
}
return Color.BLACK;
}
}