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PlantUML is a component that allows to quickly write :
* sequence diagram,
* use case diagram,
* class diagram,
* activity diagram,
* component diagram,
* state diagram
* object diagram
/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2013, Arnaud Roques
*
* Project Info: http://plantuml.sourceforge.net
*
* This file is part of PlantUML.
*
* PlantUML is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PlantUML distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* Original Author: Arnaud Roques
*
*/
package net.sourceforge.plantuml.graphic;
import java.awt.Color;
import net.sourceforge.plantuml.ugraphic.ColorMapper;
public class HtmlColorGradient implements HtmlColor {
private final HtmlColor color1;
private final HtmlColor color2;
private final char policy;
public HtmlColorGradient(HtmlColor color1, HtmlColor color2, char policy) {
if (color1 == null || color2 == null) {
throw new IllegalArgumentException();
}
this.color1 = color1;
this.color2 = color2;
this.policy = policy;
}
public final HtmlColor getColor1() {
return color1;
}
public final HtmlColor getColor2() {
return color2;
}
public final Color getColor(ColorMapper mapper, double coeff) {
if (coeff > 1 || coeff < 0) {
throw new IllegalArgumentException("c=" + coeff);
}
final Color c1 = mapper.getMappedColor(color1);
final Color c2 = mapper.getMappedColor(color2);
final int vred = c2.getRed() - c1.getRed();
final int vgreen = c2.getGreen() - c1.getGreen();
final int vblue = c2.getBlue() - c1.getBlue();
final int red = c1.getRed() + (int) (coeff * vred);
final int green = c1.getGreen() + (int) (coeff * vgreen);
final int blue = c1.getBlue() + (int) (coeff * vblue);
return new Color(red, green, blue);
}
public final char getPolicy() {
return policy;
}
}