git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/rocketcomponent/EllipticalFinSet.java

   1 package net.sf.openrocket.rocketcomponent;
   2
   3 import net.sf.openrocket.l10n.Translator;
   4 import net.sf.openrocket.startup.Application;
   5 import net.sf.openrocket.util.Coordinate;
   6 import net.sf.openrocket.util.MathUtil;
   7
   8 public class EllipticalFinSet extends FinSet {
   9         private static final Translator trans = Application.getTranslator();
  10
  11         private static final int POINTS = 31;
  12
  13         // Static positioning for the fin points
  14         private static final double[] POINT_X = new double[POINTS];
  15         private static final double[] POINT_Y = new double[POINTS];
  16         static {
  17                 for (int i = 0; i < POINTS; i++) {
  18                         double a = Math.PI * (POINTS - 1 - i) / (POINTS - 1);
  19                         POINT_X[i] = (Math.cos(a) + 1) / 2;
  20                         POINT_Y[i] = Math.sin(a);
  21                 }
  22                 POINT_X[0] = 0;
  23                 POINT_Y[0] = 0;
  24                 POINT_X[POINTS - 1] = 1;
  25                 POINT_Y[POINTS - 1] = 0;
  26         }
  27
  28
  29         private double height = 0.05;
  30
  31         public EllipticalFinSet() {
  32                 this.length = 0.05;
  33         }
  34
  35
  36         @Override
  37         public Coordinate[] getFinPoints() {
  38                 double len = MathUtil.max(length, 0.0001);
  39                 Coordinate[] points = new Coordinate[POINTS];
  40                 for (int i = 0; i < POINTS; i++) {
  41                         points[i] = new Coordinate(POINT_X[i] * len, POINT_Y[i] * height);
  42                 }
  43                 return points;
  44         }
  45
  46         @Override
  47         public double getSpan() {
  48                 return height;
  49         }
  50
  51         @Override
  52         public String getComponentName() {
  53                 //// Elliptical fin set
  54                 return trans.get("EllipticalFinSet.Ellipticalfinset");
  55         }
  56
  57
  58         public double getHeight() {
  59                 return height;
  60         }
  61
  62         public void setHeight(double height) {
  63                 if (MathUtil.equals(this.height, height))
  64                         return;
  65                 this.height = height;
  66                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  67         }
  68
  69
  70         public void setLength(double length) {
  71                 if (MathUtil.equals(this.length, length))
  72                         return;
  73                 this.length = length;
  74                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  75         }
  76
  77
  78 }