1 package com.billkuker.rocketry.motorsim;
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3 import java.text.DecimalFormat;
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4 import java.text.NumberFormat;
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5 import java.util.HashSet;
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6 import java.util.Set;
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7 import java.util.prefs.Preferences;
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9 import javax.measure.quantity.Pressure;
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10 import javax.measure.quantity.Quantity;
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11 import javax.measure.unit.NonSI;
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12 import javax.measure.unit.ProductUnit;
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13 import javax.measure.unit.SI;
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14 import javax.measure.unit.Unit;
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15 import javax.measure.unit.UnitFormat;
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17 import org.jscience.physics.amount.Amount;
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19 public class RocketScience {
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20 public static Unit<Pressure> PSI = new ProductUnit<Pressure>(NonSI.POUND_FORCE.divide(NonSI.INCH.pow(2)));
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21 public static Unit<Impulse> NEWTON_SECOND = new ProductUnit<Impulse>(SI.NEWTON.times(SI.SECOND));
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23 UnitFormat.getInstance().label(PSI, "psi");
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24 UnitFormat.getInstance().label(NEWTON_SECOND, "Ns");
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27 public interface MolarWeight extends Quantity {
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28 public static final Unit<MolarWeight> UNIT = new ProductUnit<MolarWeight>(
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29 SI.KILOGRAM.divide(SI.MOLE));
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32 public interface Impulse extends Quantity {
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33 public static Unit<Impulse> UNIT = NEWTON_SECOND;
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36 public static enum UnitPreference{
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38 javax.measure.unit.SI.MILLIMETER.pow(2),
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39 javax.measure.unit.SI.MILLIMETER,
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40 javax.measure.unit.SI.MILLIMETER.divide(javax.measure.unit.SI.SECOND),
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41 javax.measure.unit.SI.NEWTON,
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42 javax.measure.unit.SI.MEGA(javax.measure.unit.SI.PASCAL),
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46 javax.measure.unit.NonSI.INCH.pow(2),
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47 javax.measure.unit.NonSI.INCH,
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48 javax.measure.unit.NonSI.POUND_FORCE,
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49 javax.measure.unit.NonSI.INCH.divide(javax.measure.unit.SI.SECOND),
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54 private static UnitPreference preference = SI;
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57 Preferences prefs = Preferences.userNodeForPackage(RocketScience.class);
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58 String p = prefs.get("PreferedUnits", "SI");
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59 preference = UnitPreference.valueOf(p);
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62 public static UnitPreference getUnitPreference(){
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66 public static void setUnitPreference( final UnitPreference up ){
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68 Preferences prefs = Preferences.userNodeForPackage(RocketScience.class);
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69 prefs.put("PreferedUnits", up.toString());
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72 protected Set<Unit<?>> units = new HashSet<Unit<?>>();
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74 UnitPreference( Unit<?> u[] ){
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75 for ( Unit<?> uu : u )
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79 @SuppressWarnings("unchecked")
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80 public <T extends Quantity> Unit<T> getPreferredUnit(Unit<T> u){
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81 if ( units.contains(u) )
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83 for( Unit<?> ret : units ){
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84 if ( ret.isCompatible(u) ){
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85 return (Unit<T>) ret;
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92 public static <T extends Quantity> String ammountToString(Amount<T> a) {
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93 final NumberFormat nf = new DecimalFormat("##########.###");
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94 return nf.format(a.doubleValue(a.getUnit())) + " " + a.getUnit();
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97 public static <T extends Quantity> String ammountToRoundedString(Amount<T> a) {
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100 Unit<T> u = RocketScience.UnitPreference.preference.getPreferredUnit(a
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102 double d = a.doubleValue(u);
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106 if (Math.abs(d) < 10.0) {
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107 df = new DecimalFormat("#.##");
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108 } else if (Math.abs(d) < 100.0) {
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109 df = new DecimalFormat("#.#");
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111 df = new DecimalFormat("#");
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114 return df.format(d) + " " + u.toString();
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