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

   1 package net.sf.openrocket.rocketcomponent;
   2
   3 import net.sf.openrocket.material.Material;
   4 import net.sf.openrocket.util.MathUtil;
   5 import net.sf.openrocket.util.Prefs;
   6
   7 public class Parachute extends RecoveryDevice {
   8
   9         public static final double DEFAULT_CD = 0.8;
  10
  11         private double diameter;
  12
  13         private Material lineMaterial;
  14         private int lineCount = 6;
  15         private double lineLength = 0.3;
  16
  17
  18         public Parachute() {
  19                 this.diameter = 0.3;
  20                 this.lineMaterial = Prefs.getDefaultComponentMaterial(Parachute.class, Material.Type.LINE);
  21                 this.lineLength = 0.3;
  22         }
  23
  24
  25         public double getDiameter() {
  26                 return diameter;
  27         }
  28
  29         public void setDiameter(double d) {
  30                 if (MathUtil.equals(this.diameter, d))
  31                         return;
  32                 this.diameter = d;
  33                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  34         }
  35
  36
  37         public final Material getLineMaterial() {
  38                 return lineMaterial;
  39         }
  40
  41         public final void setLineMaterial(Material mat) {
  42                 if (mat.getType() != Material.Type.LINE) {
  43                         throw new IllegalArgumentException("Attempted to set non-line material "+mat);
  44                 }
  45                 if (mat.equals(lineMaterial))
  46                         return;
  47                 this.lineMaterial = mat;
  48                 if (getLineCount() != 0)
  49                         fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
  50                 else
  51                         fireComponentChangeEvent(ComponentChangeEvent.NONFUNCTIONAL_CHANGE);
  52         }
  53
  54
  55         public final int getLineCount() {
  56                 return lineCount;
  57         }
  58
  59         public final void setLineCount(int n) {
  60                 if (this.lineCount == n)
  61                         return;
  62                 this.lineCount = n;
  63                 fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
  64         }
  65
  66         public final double getLineLength() {
  67                 return lineLength;
  68         }
  69
  70         public final void setLineLength(double length) {
  71                 if (MathUtil.equals(this.lineLength, length))
  72                         return;
  73                 this.lineLength = length;
  74                 if (getLineCount() != 0)
  75                         fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
  76                 else
  77                         fireComponentChangeEvent(ComponentChangeEvent.NONFUNCTIONAL_CHANGE);
  78         }
  79
  80
  81         @Override
  82         public double getComponentCD(double mach) {
  83                 return DEFAULT_CD;  // TODO: HIGH:  Better parachute CD estimate?
  84         }
  85
  86         @Override
  87         public double getArea() {
  88                 return Math.PI * MathUtil.pow2(diameter/2);
  89         }
  90
  91         public void setArea(double area) {
  92                 if (MathUtil.equals(getArea(), area))
  93                         return;
  94                 diameter = Math.sqrt(area / Math.PI) * 2;
  95                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  96         }
  97
  98         @Override
  99         public double getComponentMass() {
 100                 return super.getComponentMass() +
 101                         getLineCount() * getLineLength() * getLineMaterial().getDensity();
 102         }
 103
 104         @Override
 105         public String getComponentName() {
 106                 return "Parachute";
 107         }
 108
 109         @Override
 110         public boolean isCompatible(Class<? extends RocketComponent> type) {
 111                 return false;
 112         }
 113
 114 }