src/java/org/tsho/dmc2/core/StepperUtil.java

   1 /*
   2  * iDMC the interactive Dynamical Model Calculator simulates and performs
   3  * graphical and numerical analysis of systems of differential and
   4  * difference equations.
   5  *
   6  * Copyright (C) 2004 Marji Lines and Alfredo Medio.
   7  *
   8  * Written by Daniele Pizzoni <auouo@tin.it>.
   9  * Extended by Alexei Grigoriev <alexei_grigoriev@libero.it>.
  10  *
  11  *
  12  *
  13  * The software program was developed within a research project financed
  14  * by the Italian Ministry of Universities, the Universities of Udine and
  15  * Ca'Foscari of Venice, the Friuli-Venezia Giulia Region.
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or any
  20  * later version.
  21  *
  22  * This program is distributed in the hope that it will be useful, but
  23  * WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  25  * General Public License for more details.
  26  */
  27 package org.tsho.dmc2.core;
  28
  29 import org.jfree.data.Range;
  30
  31
  32 public class StepperUtil {
  33     boolean stopped;
  34
  35     public interface Range2D {
  36         Range getHRange();
  37         Range getVRange();
  38     }
  39
  40     Range2D calculateBounds(Stepper stepper, int iterations) {
  41
  42         Stepper.Point2D point;
  43         double xLower, xUpper;
  44         double yLower, yUpper;
  45
  46         stopped = false;
  47         stepper.initialize();
  48
  49         point = stepper.getCurrentPoint2D();
  50         xLower = point.getX();
  51         xUpper = point.getX();
  52         yLower = point.getY();
  53         yUpper = point.getY();
  54
  55         for (int i = 0; i < iterations; i++) {
  56             if (stopped) {
  57                 break;
  58             }
  59
  60             stepper.step();
  61             point = stepper.getCurrentPoint2D();
  62
  63             if (xLower > point.getX()) {
  64                 xLower = point.getX();
  65             }
  66             else if (xUpper < point.getX()) {
  67                 xUpper = point.getX();
  68             }
  69
  70             if (yLower > point.getY()) {
  71                 yLower = point.getY();
  72             }
  73             else if (yUpper < point.getY()) {
  74                 yUpper = point.getY();
  75             }
  76         }
  77
  78         return new MyRange2D(new Range(xLower, xUpper), new Range(yLower, yUpper));
  79     }
  80
  81     void stop() {
  82         stopped = true;
  83     }
  84
  85     private class MyRange2D implements Range2D {
  86         private Range horRange, verRange;
  87
  88         MyRange2D(Range hRange, Range vRange) {
  89             horRange = hRange;
  90             verRange = vRange;
  91         }
  92
  93         public Range getHRange() {
  94             return horRange;
  95         }
  96
  97         public Range getVRange() {
  98             return verRange;
  99         }
 100     }
 101 }