org.cpsolver.ifs.example.rpp

Class RPPModel

java.lang.Object

org.cpsolver.ifs.model.Model<Rectangle,Location>

org.cpsolver.ifs.example.rpp.RPPModel

public class RPPModel
extends Model<Rectangle,Location>

RPP model.

The random placement problem (RPP; for more details, see http://www.fi.muni.cz/~hanka/rpp/) seeks to place a set of randomly generated rectangles (called objects) of different sizes into a larger rectangle (called placement area) in such a way that no objects overlap and all objects' borders are parallel to the border of the placement area. In addition, a set of allowable placements can be randomly generated for each object. The ratio between the total area of all objects and the size of the placement area will be denoted as the filled area ratio.

RPP allows us to generate various instances of the problem similar to a trivial timetabling problem. The correspondence is as follows: the object corresponds to a course to be timetabled - the x-coordinate to its time, the y-coordinate to its classroom. For example, a course taking three hours corresponds to an object with dimensions 3x1 (the course should be taught in one classroom only). Each course can be placed only in a classroom of sufficient capacity - we can expect that the classrooms are ordered increasingly in their size so each object will have a lower bound on its y-coordinate.

Version:

IFS 1.3 (Iterative Forward Search)
Copyright (C) 2006 - 2014 Tomáš Müller
muller@unitime.org
http://muller.unitime.org

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This library is 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not see http://www.gnu.org/licenses/.

Author:

Tomáš Müller

Field Summary

Fields inherited from class org.cpsolver.ifs.model.Model

sDoubleFormat, sPercentageFormat, sTimeFormat

Constructor Summary

Constructors

Constructor and Description
RPPModel() Constructor.

Method Summary

Modifier and Type	Method and Description
Rectangle	getRectangle(String name) Returns rectangle of the given name

Methods inherited from class org.cpsolver.ifs.model.Model

addConstraint, addCriterion, addGlobalConstraint, addModelListener, addVariable, afterAssigned, afterAssigned, afterUnassigned, afterUnassigned, assignedVariables, assignedVariables, beforeAssigned, beforeAssigned, beforeUnassigned, beforeUnassigned, bestUnassignedVariables, bestUnassignedVariables, clearAssignmentContexts, clearBest, conflictConstraints, conflictValues, conflictValues, constraints, countConstraints, countGlobalConstraints, countVariables, createAssignmentContexts, createInheritedAssignment, createReference, getBestPerturbations, getBestUnassignedVariables, getBestValue, getCriteria, getCriterion, getDefaultAssignment, getEmptyAssignment, getExtendedInfo, getExtendedInfo, getInfo, getInfo, getInfo, getInfo, getInfoProviders, getModelListeners, getPerc, getPercRev, getTotalValue, getTotalValue, getTotalValue, getTotalValue, globalConstraints, inConflict, inConflict, init, invalidateVariablesWithInitialValueCache, modelListenerOfType, nrAssignedVariables, nrAssignedVariables, nrUnassignedVariables, nrUnassignedVariables, perturbVariables, perturbVariables, perturbVariables, perturbVariables, perturbVariables, removeConstraint, removeCriterion, removeCriterion, removeGlobalConstraint, removeModelListener, removeReference, removeVariable, restoreBest, restoreBest, restoreBest, saveBest, saveBest, setBestValue, setDefaultAssignment, toString, toString, unassignedHardConstraints, unassignedVariables, unassignedVariables, variables, variablesWithInitialValue, weaken

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RPPModel

public RPPModel()

Constructor.

Method Detail

getRectangle

public Rectangle getRectangle(String name)

Returns rectangle of the given name

Parameters:

name - rectangle name

Returns:

rectangle of the given name