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adds documentation to aerodynmics package and some refactoring of classes

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This commit is contained in:
Luiz Victor Linhares Rocha 2016-10-13 15:04:03 -03:00
parent aeb2a3cd97
commit c9dadc10fa
5 changed files with 309 additions and 179 deletions
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34
core/src/net/sf/openrocket/aerodynamics/AerodynamicForces.java
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@ -71,12 +71,36 @@ public class AerodynamicForces implements Cloneable, Monitorable {
private int modID = 0;
/**
* creates an empty bean of AerodynamicForces with NaN values
*/
public AerodynamicForces() {
//all done in members declarations
}
/**
* initializes an AerodynamicForces already at zero
* @param zero flag to iniatilize value to zero or not
*/
public AerodynamicForces(boolean zero) {
if (zero)
this.zero();
}
/**
* gives a new component to be linked with
* changes it's modification id
* @param component The rocket component
*/
public void setComponent(RocketComponent component) {
this.component = component;
modID++;
}
/**
*
* @return the actual component linked with this
*/
public RocketComponent getComponent() {
return component;
}
@ -273,7 +297,7 @@ public class AerodynamicForces implements Cloneable, Monitorable {
@Override
public AerodynamicForces clone() {
try {
return (AerodynamicForces)super.clone();
return (AerodynamicForces) super.clone();
} catch (CloneNotSupportedException e) {
throw new BugException("CloneNotSupportedException?!?");
}
@ -308,13 +332,13 @@ public class AerodynamicForces implements Cloneable, Monitorable {
@Override
public int hashCode() {
return (int) (1000*(this.getCD()+this.getCaxial()+this.getCNa())) + this.getCP().hashCode();
return (int) (1000 * (this.getCD() + this.getCaxial() + this.getCNa())) + this.getCP().hashCode();
}
@Override
public String toString() {
String text="AerodynamicForces[";
String text = "AerodynamicForces[";
if (getComponent() != null)
text += "component:" + getComponent() + ",";
@ -341,8 +365,8 @@ public class AerodynamicForces implements Cloneable, Monitorable {
if (!Double.isNaN(getCD()))
text += "CD:" + getCD() + ",";
if (text.charAt(text.length()-1) == ',')
text = text.substring(0, text.length()-1);
if (text.charAt(text.length() - 1) == ',')
text = text.substring(0, text.length() - 1);
text += "]";
return text;

213
core/src/net/sf/openrocket/aerodynamics/BarrowmanCalculator.java
View File

@ -62,55 +62,72 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
return forces.getCP();
}
@Override
public Map<RocketComponent, AerodynamicForces> getForceAnalysis(Configuration configuration,
FlightConditions conditions, WarningSet warnings) {
checkCache(configuration);
AerodynamicForces f;
Map<RocketComponent, AerodynamicForces> map =
new LinkedHashMap<RocketComponent, AerodynamicForces>();
// Add all components to the map
for (RocketComponent c : configuration) {
f = new AerodynamicForces();
f.setComponent(c);
map.put(c, f);
}
Map<RocketComponent, AerodynamicForces> map = getComponentsMap(configuration);
// Calculate non-axial force data
AerodynamicForces total = calculateNonAxialForces(configuration, conditions, map, warnings);
// Calculate friction data
total.setFrictionCD(calculateFrictionDrag(configuration, conditions, map, warnings));
total.setPressureCD(calculatePressureDrag(configuration, conditions, map, warnings));
total.setBaseCD(calculateBaseDrag(configuration, conditions, map, warnings));
calculateFrictionData(total, configuration, conditions, warnings);
total.setComponent(configuration.getRocket());
map.put(total.getComponent(), total);
checkCDAndApplyFriction(map, conditions);
return map;
}
/**
* get a map of rocket components with their own Aerodynamic forces bean
* TODO: LOW: maybe transfer the function to Configuration class?
* @param configuration The rocket configuration
* @return the map of rocket configuration with it's
* correspondent aerodynamic forces bean
*/
private Map<RocketComponent, AerodynamicForces> getComponentsMap(Configuration configuration) {
Map<RocketComponent, AerodynamicForces> map = new LinkedHashMap<RocketComponent, AerodynamicForces>();
// Add all components to the map
for (RocketComponent c : configuration) {
AerodynamicForces f = new AerodynamicForces();
f.setComponent(c);
map.put(c, f);
}
return map;
}
for (RocketComponent c : map.keySet()) {
f = map.get(c);
/**
* check an analysis to fix possible invalid CDs and apply the actual friction
*
* @param forceAnalysis
* @param conditions
*/
private void checkCDAndApplyFriction(Map<RocketComponent, AerodynamicForces> forceAnalysis, FlightConditions conditions) {
for (RocketComponent c : forceAnalysis.keySet()) {
checkCDConsistency(forceAnalysis.get(c));
applyFriction(forceAnalysis.get(c), conditions);
}
}
/**
* fixes possibles NaN in previous calculation of CDs
*
* @param f
* @param conditions
*/
private void checkCDConsistency(AerodynamicForces f) {
if (Double.isNaN(f.getBaseCD()) && Double.isNaN(f.getPressureCD()) &&
Double.isNaN(f.getFrictionCD()))
continue;
return;
if (Double.isNaN(f.getBaseCD()))
f.setBaseCD(0);
if (Double.isNaN(f.getPressureCD()))
f.setPressureCD(0);
if (Double.isNaN(f.getFrictionCD()))
f.setFrictionCD(0);
f.setCD(f.getBaseCD() + f.getPressureCD() + f.getFrictionCD());
f.setCaxial(calculateAxialDrag(conditions, f.getCD()));
}
return map;
}
@ -127,27 +144,53 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
AerodynamicForces total = calculateNonAxialForces(configuration, conditions, null, warnings);
// Calculate friction data
total.setFrictionCD(calculateFrictionDrag(configuration, conditions, null, warnings));
total.setPressureCD(calculatePressureDrag(configuration, conditions, null, warnings));
total.setBaseCD(calculateBaseDrag(configuration, conditions, null, warnings));
total.setCD(total.getFrictionCD() + total.getPressureCD() + total.getBaseCD());
total.setCaxial(calculateAxialDrag(conditions, total.getCD()));
calculateFrictionData(total, configuration, conditions, warnings);
applyFriction(total, conditions);
// Calculate pitch and yaw damping moments
calculateDampingMoments(configuration, conditions, total);
applyDampingMoments(total);
return total;
}
/**
* Applies the actual influence of friction in an AerodynamicForces set
*
* @param force the Aerodynamic forces to be applied with friction
* @param conditions the flight conditions in consideration
*/
private void applyFriction(AerodynamicForces force, FlightConditions conditions) {
force.setCD(force.getFrictionCD() + force.getPressureCD() + force.getBaseCD());
force.setCaxial(calculateAxialDrag(conditions, force.getCD()));
}
/**
* does the actual action of damping into an AerodynamicForces set
*
* @param total the AerodynamicForces object to be applied with the damping
*/
private void applyDampingMoments(AerodynamicForces total) {
total.setCm(total.getCm() - total.getPitchDampingMoment());
total.setCyaw(total.getCyaw() - total.getYawDampingMoment());
}
return total;
/**
* Will calculate all basic CD from an AerodynamicForces set
* @param total The AerodynamicForces that will be calculated
* @param configuration the Rocket configutarion
* @param conditions Flight conditions in the simulation
* @param warnings Warning set to handle special events
*/
private void calculateFrictionData(AerodynamicForces total, Configuration configuration, FlightConditions conditions, WarningSet warnings) {
total.setFrictionCD(calculateFrictionDrag(configuration, conditions, null, warnings));
total.setPressureCD(calculatePressureDrag(configuration, conditions, null, warnings));
total.setBaseCD(calculateBaseDrag(configuration, conditions, null, warnings));
}
/*
/**
* Perform the actual CP calculation.
*/
private AerodynamicForces calculateNonAxialForces(Configuration configuration, FlightConditions conditions,
@ -155,8 +198,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
checkCache(configuration);
AerodynamicForces total = new AerodynamicForces();
total.zero();
AerodynamicForces total = new AerodynamicForces(true);
double radius = 0; // aft radius of previous component
double componentX = 0; // aft coordinate of previous component
@ -169,8 +211,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
warnings.add(new Warning.LargeAOA(conditions.getAOA()));
if (calcMap == null)
buildCalcMap(configuration);
checkCalcMap(configuration);
for (RocketComponent component : configuration) {
@ -207,6 +248,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
forces.setCP(component.toAbsolute(forces.getCP())[0]);
forces.setCm(forces.getCN() * forces.getCP().x / conditions.getRefLength());
//TODO: LOW: Why is it here? was this the todo from above? Vicilu
if (map != null) {
AerodynamicForces f = map.get(component);
@ -219,6 +261,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
f.setCroll(forces.getCroll());
f.setCrollDamp(forces.getCrollDamp());
f.setCrollForce(forces.getCrollForce());
map.replace(component, f); //have you forgotten to add this?
}
total.setCP(total.getCP().average(forces.getCP()));
@ -239,8 +282,16 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
//////////////// DRAG CALCULATIONS ////////////////
//TODO: LOW: clarify what map is doing here, or use it
/**
* Calculation of drag coefficient due to air friction
*
* @param configuration Rocket configuration
* @param conditions Flight conditions taken into account
* @param map ?
* @param set Set to handle
* @return
*/
private double calculateFrictionDrag(Configuration configuration, FlightConditions conditions,
Map<RocketComponent, AerodynamicForces> map, WarningSet set) {
double c1 = 1.0, c2 = 1.0;
@ -249,8 +300,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
double Re;
double Cf;
if (calcMap == null)
buildCalcMap(configuration);
checkCalcMap(configuration);
Re = conditions.getVelocity() * configuration.getLength() /
conditions.getAtmosphericConditions().getKinematicViscosity();
@ -371,8 +421,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
// Calculate the roughness-limited friction coefficient
Finish finish = ((ExternalComponent) c).getFinish();
if (Double.isNaN(roughnessLimited[finish.ordinal()])) {
roughnessLimited[finish.ordinal()] =
0.032 * Math.pow(finish.getRoughnessSize() / configuration.getLength(), 0.2) *
roughnessLimited[finish.ordinal()] = 0.032 * Math.pow(finish.getRoughnessSize() / configuration.getLength(), 0.2) *
roughnessCorrection;
}
@ -448,16 +497,32 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
return (finFriction + correction * bodyFriction) / conditions.getRefArea();
}
/**
* method to avoid repetition, create the calcMap if null
* @param configuration the rocket configuration
*/
private void checkCalcMap(Configuration configuration) {
if (calcMap == null)
buildCalcMap(configuration);
}
//TODO: LOW: clarify what map is doing here, or use it
/**
* Calculation of drag coefficient due to pressure
*
* @param configuration Rocket configuration
* @param conditions Flight conditions taken into account
* @param map ?
* @param set Set to handle
* @return
*/
private double calculatePressureDrag(Configuration configuration, FlightConditions conditions,
Map<RocketComponent, AerodynamicForces> map, WarningSet warnings) {
double stagnation, base, total;
double radius = 0;
if (calcMap == null)
buildCalcMap(configuration);
checkCalcMap(configuration);
stagnation = calculateStagnationCD(conditions.getMach());
base = calculateBaseCD(conditions.getMach());
@ -497,7 +562,16 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
return total;
}
//TODO: LOW: clarify what map is doing here, or use it
/**
* Calculation of drag coefficient due to base
*
* @param configuration Rocket configuration
* @param conditions Flight conditions taken into account
* @param map ?
* @param set Set to handle
* @return
*/
private double calculateBaseDrag(Configuration configuration, FlightConditions conditions,
Map<RocketComponent, AerodynamicForces> map, WarningSet warnings) {
@ -505,8 +579,7 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
double radius = 0;
RocketComponent prevComponent = null;
if (calcMap == null)
buildCalcMap(configuration);
checkCalcMap(configuration);
base = calculateBaseCD(conditions.getMach());
total = 0;
@ -543,7 +616,11 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
}
/**
* gets CD by the speed
* @param m Mach number for calculation
* @return Stagnation CD
*/
public static double calculateStagnationCD(double m) {
double pressure;
if (m <= 1) {
@ -554,7 +631,11 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
return 0.85 * pressure;
}
/**
* Calculates base CD
* @param m Mach number for calculation
* @return Base CD
*/
public static double calculateBaseCD(double m) {
if (m <= 1) {
return 0.12 + 0.13 * m * m;
@ -570,15 +651,13 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
PolyInterpolator interpolator;
interpolator = new PolyInterpolator(
new double[] { 0, 17 * Math.PI / 180 },
new double[] { 0, 17 * Math.PI / 180 }
);
new double[] { 0, 17 * Math.PI / 180 });
axialDragPoly1 = interpolator.interpolator(1, 1.3, 0, 0);
interpolator = new PolyInterpolator(
new double[] { 17 * Math.PI / 180, Math.PI / 2 },
new double[] { 17 * Math.PI / 180, Math.PI / 2 },
new double[] { Math.PI / 2 }
);
new double[] { Math.PI / 2 });
axialDragPoly2 = interpolator.interpolator(1.3, 0, 0, 0, 0);
}
@ -611,7 +690,12 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
return -mul * cd;
}
/**
* get damping moments from a rocket in a flight
* @param configuration Rocket configuration
* @param conditions flight conditions in consideration
* @param total acting aerodynamic forces
*/
private void calculateDampingMoments(Configuration configuration, FlightConditions conditions,
AerodynamicForces total) {
@ -665,7 +749,8 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
mul += 0.6 * Math.min(f.getFinCount(), 4) * f.getFinArea() *
MathUtil.pow3(Math.abs(f.toAbsolute(new Coordinate(
((FinSetCalc) calcMap.get(f)).getMidchordPos()))[0].x
- cgx)) /
- cgx))
/
(conditions.getRefArea() * conditions.getRefLength());
}
}
@ -676,7 +761,6 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
//////// The calculator map
@Override
protected void voidAerodynamicCache() {
super.voidAerodynamicCache();
@ -686,7 +770,10 @@ public class BarrowmanCalculator extends AbstractAerodynamicCalculator {
cacheLength = -1;
}
/**
* caches the map for aerodynamics calculations
* @param configuration the rocket configuration
*/
private void buildCalcMap(Configuration configuration) {
Iterator<RocketComponent> iterator;

51
core/src/net/sf/openrocket/aerodynamics/FlightConditions.java
View File

@ -63,9 +63,12 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/** Current roll rate. */
private double rollRate = 0;
/** Current pitch rate. */
private double pitchRate = 0;
/** Current yaw rate. */
private double yawRate = 0;
private Coordinate pitchCenter = Coordinate.NUL;
@ -102,6 +105,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Set the reference length and area.
* fires change event
*/
public void setRefLength(double length) {
refLength = length;
@ -111,7 +115,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
}
/**
* Return the reference length.
* @return the reference length.
*/
public double getRefLength() {
return refLength;
@ -119,6 +123,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Set the reference area and length.
* fires change event
*/
public void setRefArea(double area) {
refArea = area;
@ -127,7 +132,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
}
/**
* Return the reference area.
* @return the reference area.
*/
public double getRefArea() {
return refArea;
@ -137,7 +142,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Sets the angle of attack. It calculates values also for the methods
* {@link #getSinAOA()} and {@link #getSincAOA()}.
*
* fires change event if it's different from previous value
* @param aoa the angle of attack.
*/
public void setAOA(double aoa) {
@ -162,6 +167,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
* to be the sine of <code>aoa</code> for cases in which this value is known.
* The AOA must still be specified, as the sine is not unique in the range
* of 0..180 degrees.
* fires change event if it's different from previous value
*
* @param aoa the angle of attack in radians.
* @param sinAOA the sine of the angle of attack.
@ -186,21 +192,21 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Return the angle of attack.
* @return the angle of attack.
*/
public double getAOA() {
return aoa;
}
/**
* Return the sine of the angle of attack.
* @return the sine of the angle of attack.
*/
public double getSinAOA() {
return sinAOA;
}
/**
* Return the sinc of the angle of attack (sin(AOA) / AOA). This method returns
* @return the sinc of the angle of attack (sin(AOA) / AOA). This method returns
* one if the angle of attack is zero.
*/
public double getSincAOA() {
@ -210,6 +216,8 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Set the direction of the lateral airflow.
* fires change event if it's different from previous value
*
*/
public void setTheta(double theta) {
if (MathUtil.equals(this.theta, theta))
@ -219,7 +227,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
}
/**
* Return the direction of the lateral airflow.
* @return the direction of the lateral airflow.
*/
public double getTheta() {
return theta;
@ -229,6 +237,8 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Set the current Mach speed. This should be (but is not required to be) in
* reference to the speed of sound of the atmospheric conditions.
*
* fires change event if it's different from previous value
*/
public void setMach(double mach) {
mach = Math.max(mach, 0);
@ -244,7 +254,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
}
/**
* Return the current Mach speed.
* @return the current Mach speed.
*/
public double getMach() {
return mach;
@ -272,7 +282,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Return sqrt(abs(1 - Mach^2)). This is calculated in the setting call and is
* @return sqrt(abs(1 - Mach^2)). This is calculated in the setting call and is
* therefore fast.
*/
public double getBeta() {
@ -281,7 +291,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Return the current roll rate.
* @return the current roll rate.
*/
public double getRollRate() {
return rollRate;
@ -290,6 +300,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Set the current roll rate.
* fires change event if it's different from previous
*/
public void setRollRate(double rate) {
if (MathUtil.equals(this.rollRate, rate))
@ -300,11 +311,19 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
}
/**
*
* @return current pitch rate
*/
public double getPitchRate() {
return pitchRate;
}
/**
* sets the pitch rate
* fires change event if it's different from previous
* @param pitchRate
*/
public void setPitchRate(double pitchRate) {
if (MathUtil.equals(this.pitchRate, pitchRate))
return;
@ -312,7 +331,10 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
fireChangeEvent();
}
/**
*
* @return current yaw rate
*/
public double getYawRate() {
return yawRate;
}
@ -402,7 +424,7 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
/**
* Return a copy of the flight conditions. The copy has no listeners. The
* @return a copy of the flight conditions. The copy has no listeners. The
* atmospheric conditions is also cloned.
*/
@Override
@ -454,6 +476,9 @@ public class FlightConditions implements Cloneable, ChangeSource, Monitorable {
listenerList.remove(listener);
}
/**
* wake up call to listeners
*/
protected void fireChangeEvent() {
modID = UniqueID.next();
// Copy the list before iterating to prevent concurrent modification exceptions.

33
core/src/net/sf/openrocket/aerodynamics/Warning.java
View File

@ -7,10 +7,11 @@ import net.sf.openrocket.unit.UnitGroup;
public abstract class Warning {
/** support to multiple languages warning */
private static final Translator trans = Application.getTranslator();
/**
* Return a Warning with the specific text.
* @return a Warning with the specific text.
*/
public static Warning fromString(String text) {
return new Warning.Other(text);
@ -321,43 +322,33 @@ public abstract class Warning {
/** A <code>Warning</code> that the body diameter is discontinuous. */
////Discontinuity in rocket body diameter.
public static final Warning DISCONTINUITY =
new Other(trans.get("Warning.DISCONTINUITY"));
public static final Warning DISCONTINUITY = new Other(trans.get("Warning.DISCONTINUITY"));
/** A <code>Warning</code> that the fins are thick compared to the rocket body. */
////Thick fins may not be modeled accurately.
public static final Warning THICK_FIN =
new Other(trans.get("Warning.THICK_FIN"));
public static final Warning THICK_FIN = new Other(trans.get("Warning.THICK_FIN"));
/** A <code>Warning</code> that the fins have jagged edges. */
////Jagged-edged fin predictions may be inaccurate.
public static final Warning JAGGED_EDGED_FIN =
new Other(trans.get("Warning.JAGGED_EDGED_FIN"));
public static final Warning JAGGED_EDGED_FIN = new Other(trans.get("Warning.JAGGED_EDGED_FIN"));
/** A <code>Warning</code> that simulation listeners have affected the simulation */
////Listeners modified the flight simulation
public static final Warning LISTENERS_AFFECTED =
new Other(trans.get("Warning.LISTENERS_AFFECTED"));
public static final Warning LISTENERS_AFFECTED = new Other(trans.get("Warning.LISTENERS_AFFECTED"));
////Recovery device opened while motor still burning.
public static final Warning RECOVERY_DEPLOYMENT_WHILE_BURNING =
new Other(trans.get("Warning.RECOVERY_DEPLOYMENT_WHILE_BURNING"));
public static final Warning RECOVERY_DEPLOYMENT_WHILE_BURNING = new Other(trans.get("Warning.RECOVERY_DEPLOYMENT_WHILE_BURNING"));
//// Invalid parameter encountered, ignoring.
public static final Warning FILE_INVALID_PARAMETER =
new Other(trans.get("Warning.FILE_INVALID_PARAMETER"));
public static final Warning FILE_INVALID_PARAMETER = new Other(trans.get("Warning.FILE_INVALID_PARAMETER"));
public static final Warning PARALLEL_FINS =
new Other(trans.get("Warning.PARALLEL_FINS"));
public static final Warning PARALLEL_FINS = new Other(trans.get("Warning.PARALLEL_FINS"));
public static final Warning SUPERSONIC =
new Other(trans.get("Warning.SUPERSONIC"));
public static final Warning SUPERSONIC = new Other(trans.get("Warning.SUPERSONIC"));
public static final Warning RECOVERY_LAUNCH_ROD =
new Other(trans.get("Warning.RECOVERY_LAUNCH_ROD"));
public static final Warning RECOVERY_LAUNCH_ROD = new Other(trans.get("Warning.RECOVERY_LAUNCH_ROD"));
public static final Warning TUMBLE_UNDER_THRUST =
new Other(trans.get("Warning.TUMBLE_UNDER_THRUST"));
public static final Warning TUMBLE_UNDER_THRUST = new Other(trans.get("Warning.TUMBLE_UNDER_THRUST"));
}

3
core/src/net/sf/openrocket/util/AbstractChangeSource.java
View File

@ -31,6 +31,9 @@ public class AbstractChangeSource implements ChangeSource {
log.trace("Removing change listeners, listener count is now " + listeners.size());
}
/**
* execute a change event from any listeners that are triggered by it
*/
public void fireChangeEvent(Object source) {
EventObject event = new EventObject(source);
// Copy the list before iterating to prevent concurrent modification exceptions.