mirror of https://github.com/octoleo/plantuml.git
83 lines
2.3 KiB
Java
83 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 2009-2024, Arnaud Roques
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*
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* Project Info: https://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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* https://plantuml.com/patreon (only 1$ per month!)
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* https://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.klimt.geom;
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public class CoordinateChange {
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private final double x1;
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private final double y1;
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private final double x2;
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private final double y2;
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private final double vect_u_x;
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private final double vect_u_y;
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private final double vect_v_x;
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private final double vect_v_y;
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private final double len;
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public static CoordinateChange create(XPoint2D p1, XPoint2D p2) {
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return new CoordinateChange(p1.getX(), p1.getY(), p2.getX(), p2.getY());
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}
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public CoordinateChange(double x1, double y1, double x2, double y2) {
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this.x1 = x1;
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this.y1 = y1;
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this.x2 = x2;
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this.y2 = y2;
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this.len = XPoint2D.distance(x1, y1, x2, y2);
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if (this.len == 0) {
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throw new IllegalArgumentException();
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}
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this.vect_u_x = (x2 - x1) / len;
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this.vect_u_y = (y2 - y1) / len;
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this.vect_v_x = -this.vect_u_y;
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this.vect_v_y = this.vect_u_x;
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}
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public XPoint2D getTrueCoordinate(double a, double b) {
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final double x = a * vect_u_x + b * vect_v_x;
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final double y = a * vect_u_y + b * vect_v_y;
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return new XPoint2D(x1 + x, y1 + y);
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}
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public final double getLength() {
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return len;
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}
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} |