net.sourceforge.plantuml.real.PositiveForce Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of plantuml-gplv2 Show documentation
PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.real;

import net.sourceforge.plantuml.log.Logme;

class PositiveForce {

	private final Real fixedPoint;
	private final RealMoveable movingPoint;
	private final double minimunDistance;
	private final boolean trace = false;
	private final Throwable creationPoint;

	public PositiveForce(Real fixedPoint, RealMoveable movingPoint, double minimunDistance) {
		if (fixedPoint == movingPoint) {
			throw new IllegalArgumentException();
		}
		this.fixedPoint = fixedPoint;
		this.movingPoint = movingPoint;
		this.minimunDistance = minimunDistance;
		this.creationPoint = new Throwable();
		this.creationPoint.fillInStackTrace();
	}

	@Override
	public String toString() {
		return "PositiveForce fixed=" + fixedPoint + " moving=" + movingPoint + " min=" + minimunDistance;
	}

	public boolean apply() {
		if (trace) {
			System.err.println("apply " + this);
		}
		final double movingPointValue = movingPoint.getCurrentValue();
		final double fixedPointValue;
		try {
			fixedPointValue = fixedPoint.getCurrentValue();
		} catch (IllegalStateException e) {
			System.err.println("Pb with force " + this);
			System.err.println("This force has been created here:");
			Logme.error(creationPoint);
			System.err.println("The fixed point has been created here: " + fixedPoint);
			fixedPoint.printCreationStackTrace();
			throw e;
		}
		final double distance = movingPointValue - fixedPointValue;
		final double diff = distance - minimunDistance;
		if (diff >= 0) {
			if (trace) {
				System.err.println("Not using ");
			}
			return false;
		}
		if (trace) {
			System.err.println("moving " + (-diff) + " " + movingPoint);
		}
		movingPoint.move(-diff);
		return true;
	}

}