net.sf.cpsolver.ifs.example.rpp
Class RPPModel
java.lang.Object
net.sf.cpsolver.ifs.model.Model<Rectangle,Location>
net.sf.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 1.2 (Iterative Forward Search)
Copyright (C) 2006 - 2010 Tomas Muller
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/.
Constructor Summary |
RPPModel()
Constructor. |
Methods inherited from class net.sf.cpsolver.ifs.model.Model |
addConstraint, addCriterion, addGlobalConstraint, addModelListener, addVariable, afterAssigned, afterUnassigned, assignedVariables, beforeAssigned, beforeUnassigned, bestUnassignedVariables, clearBest, conflictConstraints, conflictValues, constraints, countConstraints, countGlobalConstraints, countVariables, getBestPerturbations, getBestUnassignedVariables, getCriteria, getCriterion, getExtendedInfo, getInfo, getInfo, getInfoProviders, getModelListeners, getPerc, getPercRev, getTotalValue, getTotalValue, globalConstraints, inConflict, init, invalidateVariablesWithInitialValueCache, modelListenerOfType, nrAssignedVariables, nrUnassignedVariables, perturbVariables, perturbVariables, removeConstraint, removeCriterion, removeCriterion, removeGlobalConstraint, removeModelListener, removeVariable, restoreBest, restoreBest, saveBest, toString, unassignedHardConstraints, unassignedVariables, variables, variablesWithInitialValue, weaken |
RPPModel
public RPPModel()
- Constructor.
getRectangle
public Rectangle getRectangle(String name)
- Returns rectangle of the given name
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