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

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