bundles/org.simantics.equation/src/org/simantics/equation/ext/SecondOrderScalarPolynomialSolver.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.equation.ext;
  13
  14 import org.simantics.db.Resource;
  15 import org.simantics.db.ReadGraph;
  16 import org.simantics.db.exception.DatabaseException;
  17 import org.simantics.equation.EquationResources;
  18 import org.simantics.equation.solver.ExpressionSolver;
  19 import org.simantics.equation.solver.Solver;
  20 import org.simantics.equation.stubs.EquationResource;
  21
  22 public class SecondOrderScalarPolynomialSolver implements ExpressionSolver {
  23
  24     public void evaluate(Solver solver, ReadGraph g, Resource t) throws DatabaseException {
  25         EquationResource eq = EquationResources.equationResource;
  26
  27         double a = g.getRelatedValue(t, eq.HasA);
  28         double b = g.getRelatedValue(t, eq.HasB);
  29         double c = g.getRelatedValue(t, eq.HasC);
  30
  31         double x = solver.getDoubleValue(g, g.getSingleObject(t, eq.HasSource));
  32
  33         double r = a * x * x + b * x + c;
  34
  35         solver.setValue(g.getSingleObject(t, eq.HasTarget), new double[] { r });
  36     }
  37
  38 }