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93 lines
2.5 KiB
Java
93 lines
2.5 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 2009-2023, 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.svek.image;
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import net.sourceforge.plantuml.awt.geom.XPoint2D;
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import net.sourceforge.plantuml.ugraphic.UEllipse;
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public class RotatedEllipse {
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private final UEllipse ellipse;
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private final double beta;
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public RotatedEllipse(UEllipse ellipse, double beta) {
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this.ellipse = ellipse;
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this.beta = beta;
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}
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public double getA() {
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return ellipse.getWidth() / 2;
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}
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public double getB() {
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return ellipse.getHeight() / 2;
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}
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public double getBeta() {
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return beta;
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}
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public XPoint2D getPoint(double theta) {
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final double x = getA() * Math.cos(theta);
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final double y = getB() * Math.sin(theta);
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final double xp = x * Math.cos(beta) - y * Math.sin(beta);
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final double yp = x * Math.sin(beta) + y * Math.cos(beta);
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return new XPoint2D(xp, yp);
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}
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public double getOtherTheta(double theta1) {
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final double z = getPoint(theta1).getX();
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final double a = getA() * Math.cos(beta);
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final double b = getB() * Math.sin(beta);
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final double sum = 2 * a * z / (a * a + b * b);
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final double other = sum - Math.cos(theta1);
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return -Math.acos(other);
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}
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private double other(double[] all, double some) {
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final double diff0 = Math.abs(some - all[0]);
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final double diff1 = Math.abs(some - all[1]);
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if (diff0 > diff1) {
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return all[0];
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}
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return all[1];
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}
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}
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