net.sf.cpsolver.ifs.example.rpp
Class RPPModel
java.lang.Object
net.sf.cpsolver.ifs.model.Model
net.sf.cpsolver.ifs.example.rpp.RPPModel
public class RPPModel
- extends Model
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 1.1 (Iterative Forward Search)
Copyright (C) 2006 Tomáš Müller
muller@unitime.org
Lazenska 391, 76314 Zlin, Czech Republic
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 2.1 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Constructor Summary |
RPPModel()
Constructor. |
Methods inherited from class net.sf.cpsolver.ifs.model.Model |
addConstraint, addGlobalConstraint, addModelListener, addVariable, afterAssigned, afterUnassigned, assignedVariables, beforeAssigned, beforeUnassigned, bestUnassignedVariables, clearBest, conflictConstraints, conflictValues, constraints, countConstraints, countGlobalConstraints, countVariables, getBestPerturbations, getBestUnassignedVariables, getExtendedInfo, getInfo, getInfo, getInfoProviders, getModelListeners, getPerc, getPercRev, getTotalValue, getTotalValue, globalConstraints, inConflict, init, invalidateVariablesWithInitialValueCache, modelListenerOfType, nrAssignedVariables, nrUnassignedVariables, perturbVariables, perturbVariables, removeConstraint, removeGlobalConstraint, removeModelListener, removeVariable, restoreBest, saveBest, toString, unassignedHardConstraints, unassignedVariables, variables, variablesWithInitialValue |
RPPModel
public RPPModel()
- Constructor.
getRectangle
public Rectangle getRectangle(String name)
- Returns rectangle of the given name