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