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.l10n.Translator;
   4 import net.sf.openrocket.material.Material;
   5 import net.sf.openrocket.startup.Application;
   6 import net.sf.openrocket.util.MathUtil;
   7 import net.sf.openrocket.util.Prefs;
   8
   9 public class Parachute extends RecoveryDevice {
  10         private static final Translator trans = Application.getTranslator();
  11
  12         public static final double DEFAULT_CD = 0.8;
  13
  14         private double diameter;
  15
  16         private Material lineMaterial;
  17         private int lineCount = 6;
  18         private double lineLength = 0.3;
  19
  20
  21         public Parachute() {
  22                 this.diameter = 0.3;
  23                 this.lineMaterial = Prefs.getDefaultComponentMaterial(Parachute.class, Material.Type.LINE);
  24                 this.lineLength = 0.3;
  25         }
  26
  27
  28         public double getDiameter() {
  29                 return diameter;
  30         }
  31
  32         public void setDiameter(double d) {
  33                 if (MathUtil.equals(this.diameter, d))
  34                         return;
  35                 this.diameter = d;
  36                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  37         }
  38
  39
  40         public final Material getLineMaterial() {
  41                 return lineMaterial;
  42         }
  43
  44         public final void setLineMaterial(Material mat) {
  45                 if (mat.getType() != Material.Type.LINE) {
  46                         throw new IllegalArgumentException("Attempted to set non-line material " + mat);
  47                 }
  48                 if (mat.equals(lineMaterial))
  49                         return;
  50                 this.lineMaterial = mat;
  51                 if (getLineCount() != 0)
  52                         fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
  53                 else
  54                         fireComponentChangeEvent(ComponentChangeEvent.NONFUNCTIONAL_CHANGE);
  55         }
  56
  57
  58         public final int getLineCount() {
  59                 return lineCount;
  60         }
  61
  62         public final void setLineCount(int n) {
  63                 if (this.lineCount == n)
  64                         return;
  65                 this.lineCount = n;
  66                 fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
  67         }
  68
  69         public final double getLineLength() {
  70                 return lineLength;
  71         }
  72
  73         public final void setLineLength(double length) {
  74                 if (MathUtil.equals(this.lineLength, length))
  75                         return;
  76                 this.lineLength = length;
  77                 if (getLineCount() != 0)
  78                         fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
  79                 else
  80                         fireComponentChangeEvent(ComponentChangeEvent.NONFUNCTIONAL_CHANGE);
  81         }
  82
  83
  84         @Override
  85         public double getComponentCD(double mach) {
  86                 return DEFAULT_CD; // TODO: HIGH:  Better parachute CD estimate?
  87         }
  88
  89         @Override
  90         public double getArea() {
  91                 return Math.PI * MathUtil.pow2(diameter / 2);
  92         }
  93
  94         public void setArea(double area) {
  95                 if (MathUtil.equals(getArea(), area))
  96                         return;
  97                 diameter = MathUtil.safeSqrt(area / Math.PI) * 2;
  98                 fireComponentChangeEvent(ComponentChangeEvent.BOTH_CHANGE);
  99         }
 100
 101         @Override
 102         public double getComponentMass() {
 103                 return super.getComponentMass() +
 104                                 getLineCount() * getLineLength() * getLineMaterial().getDensity();
 105         }
 106
 107         @Override
 108         public String getComponentName() {
 109                 //// Parachute
 110                 return trans.get("Parachute.Parachute");
 111         }
 112
 113         @Override
 114         public boolean allowsChildren() {
 115                 return false;
 116         }
 117
 118         @Override
 119         public boolean isCompatible(Class<? extends RocketComponent> type) {
 120                 return false;
 121         }
 122
 123 }