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/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2017, Arnaud Roques
*
* Project Info: http://plantuml.com
*
* If you like this project or if you find it useful, you can support us at:
*
* http://plantuml.com/patreon (only 1$ per month!)
* http://plantuml.com/paypal
*
* 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.
*
*
* Original Author: Arnaud Roques
*
*
*/
package net.sourceforge.plantuml.real;
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:");
creationPoint.printStackTrace();
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;
}
}
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