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

   1 package net.sf.openrocket.rocketcomponent;
   2
   3 import net.sf.openrocket.material.Material;
   4 import net.sf.openrocket.unit.UnitGroup;
   5 import net.sf.openrocket.util.Prefs;
   6
   7 import java.util.List;
   8
   9 /**
  10  * Class of components with well-defined physical appearance and which have an effect on
  11  * aerodynamic simulation.  They have material defined for them, and the mass of the component
  12  * is calculated using the component's volume.
  13  *
  14  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  15  */
  16
  17 public abstract class ExternalComponent extends RocketComponent {
  18
  19         public enum Finish {
  20                 ROUGH("Rough", 500e-6),
  21                 UNFINISHED("Unfinished", 150e-6),
  22                 NORMAL("Regular paint", 60e-6),
  23                 SMOOTH("Smooth paint", 20e-6),
  24                 POLISHED("Polished", 2e-6);
  25
  26                 private final String name;
  27                 private final double roughnessSize;
  28
  29                 Finish(String name, double roughness) {
  30                         this.name = name;
  31                         this.roughnessSize = roughness;
  32                 }
  33
  34                 public double getRoughnessSize() {
  35                         return roughnessSize;
  36                 }
  37
  38                 @Override
  39                 public String toString() {
  40                         return name + " (" + UnitGroup.UNITS_ROUGHNESS.toStringUnit(roughnessSize) + ")";
  41                 }
  42         }
  43
  44
  45         /**
  46          * The material of the component.
  47          */
  48         protected Material material = null;
  49
  50         protected Finish finish = Finish.NORMAL;
  51
  52
  53
  54         /**
  55          * Constructor that sets the relative position of the component.
  56          */
  57         public ExternalComponent(RocketComponent.Position relativePosition) {
  58                 super(relativePosition);
  59                 this.material = Prefs.getDefaultComponentMaterial(this.getClass(), Material.Type.BULK);
  60         }
  61
  62         /**
  63          * Returns the volume of the component.  This value is used in calculating the mass
  64          * of the object.
  65          */
  66         public abstract double getComponentVolume();
  67
  68         /**
  69          * Calculates the mass of the component as the product of the volume and interior density.
  70          */
  71         @Override
  72         public double getComponentMass() {
  73                 return material.getDensity() * getComponentVolume();
  74         }
  75
  76         /**
  77          * ExternalComponent has aerodynamic effect, so return true.
  78          */
  79         @Override
  80         public boolean isAerodynamic() {
  81                 return true;
  82         }
  83
  84         /**
  85          * ExternalComponent has effect on the mass, so return true.
  86          */
  87         @Override
  88         public boolean isMassive() {
  89                 return true;
  90         }
  91
  92
  93         public Material getMaterial() {
  94                 return material;
  95         }
  96
  97         public void setMaterial(Material mat) {
  98                 if (mat.getType() != Material.Type.BULK) {
  99                         throw new IllegalArgumentException("ExternalComponent requires a bulk material" +
 100                                         " type=" + mat.getType());
 101                 }
 102
 103                 if (material.equals(mat))
 104                         return;
 105                 material = mat;
 106                 fireComponentChangeEvent(ComponentChangeEvent.MASS_CHANGE);
 107         }
 108
 109         public Finish getFinish() {
 110                 return finish;
 111         }
 112
 113         public void setFinish(Finish finish) {
 114                 if (this.finish == finish)
 115                         return;
 116                 this.finish = finish;
 117                 fireComponentChangeEvent(ComponentChangeEvent.AERODYNAMIC_CHANGE);
 118         }
 119
 120
 121         @Override
 122         protected List<RocketComponent> copyFrom(RocketComponent c) {
 123                 ExternalComponent src = (ExternalComponent) c;
 124                 this.finish = src.finish;
 125                 this.material = src.material;
 126                 return super.copyFrom(c);
 127         }
 128
 129 }