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81 lines
2.3 KiB
Java
81 lines
2.3 KiB
Java
/* ========================================================================
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* PlantUML : a free UML diagram generator
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* ========================================================================
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*
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* (C) Copyright 2009-2020, Arnaud Roques
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*
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* Project Info: http://plantuml.com
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*
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* If you like this project or if you find it useful, you can support us at:
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*
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* http://plantuml.com/patreon (only 1$ per month!)
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* http://plantuml.com/paypal
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*
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* This file is part of PlantUML.
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*
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* PlantUML is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* PlantUML distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*
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*
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* Original Author: Arnaud Roques
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*
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*
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*/
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package net.sourceforge.plantuml.ugraphic;
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import java.awt.Color;
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public class ShadowManager {
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// http://www.w3schools.com/svg/svg_feoffset.asp
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private final int c1;
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private final int c2;
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public ShadowManager(int c1, int c2) {
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this.c1 = c1;
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this.c2 = c2;
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}
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public double[] getShadowDeltaPoints(double deltaShadow, double diff, double[] points) {
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assert points.length % 2 == 0;
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double cx = 0;
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double cy = 0;
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for (int i = 0; i < points.length; i += 2) {
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cx += points[i];
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cy += points[i + 1];
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}
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final int nbPoints = points.length / 2;
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cx = cx / nbPoints;
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cy = cy / nbPoints;
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final double[] result = new double[points.length];
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for (int i = 0; i < result.length; i += 2) {
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final double diffx = points[i] > cx ? -diff : diff;
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final double diffy = points[i + 1] > cy ? -diff : diff;
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result[i] = points[i] + diffx + deltaShadow;
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result[i + 1] = points[i + 1] + diffy + deltaShadow;
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}
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return result;
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}
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public Color getColor(double delta, double total) {
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final int c = (int) (c2 + 1.0 * delta / total * (c1 - c2));
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return new Color(c, c, c);
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}
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}
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