Aufgabenblatt 4
This commit is contained in:
Anton Ertl
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# Aufgabenblatt 4
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## Allgemeine Anmerkungen
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Ihre Lösung für dieses Aufgabenblatt ist bis Montag, 2.5. 11h durch `git commit` und `push`
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abzugeben. Mit der Angabe werden die Dateien `CosmicSystem.java`, `Drawable.java`,
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`NamedBodyForcePair.java`, `HierarchicalSystem.java`, `Simulation4.java` und `Aufgabe4Test.java`
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mitgeliefert.
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Wenn Sie zusätzlich zu den gefragten Klassen weitere Klassen definieren, achten Sie darauf, dass
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die Klassennamen mit `My` beginnen, um Konflikte mit späteren Aufgabenblättern zu vermeiden.
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## Ziel
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Ziel der Aufgabe ist die Anwendung der Konzepte: Interfaces, dynamisches Binden, toString()
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(siehe Skriptum Seite 75-84).
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## Beschreibung der gegebenen Dateien
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- [CosmicSystem](../src/CosmicSystem.java) ist ein gegebenes Interface, das von den Klassen
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`NamedBodyForcePair` und `HierarchicalSystem` implementiert wird. Mithilfe dieses lässt sich somit eine
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Hierarchie von Systemen und Subsystemen beschreiben. Unser Sonnensystem ist ein Beispiel eines Systems,
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das mehrere Teilsysteme beinhaltet. Ein solches Teilsystem ist beispielsweise das System Erde und Erdmond.
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Ein anderes Teilsystem wäre Jupiter mit seinen Monden. Verändern Sie dieses Interface nicht.
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- [Drawable](../src/Drawable.java) wird von `CosmicSystem` verwendet. Verändern Sie dieses Interface
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nicht.
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- [NamedBodyForcePair](../src/NamedBodyForcePair.java) ist das Gerüst für eine Klassendefinition.
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Die Klasse implementiert `CosmicSystem` und repräsentiert einen einzelnen benannten Himmelskörper
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(z.B. "Mars") zusammen mit der auf ihn wirkenden Kraft.
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- [HierarchicalSystem](../src/HierarchicalSystem.java) ist das Gerüst für eine Klassendefinition.
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Die Klasse implementiert `CosmicSystem`und repräsentiert ein System von Himmelskörpern (z.B.
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Sonnensystem) bestehend aus einem zentralen Himmelskörper und beliebig vielen Untersystemen in
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dessen Orbit. Für alle Himmelskörper werden die Kräfte, die auf diese jeweils wirken, mitverwaltet.
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- [Simulation4](../src/Simulation4.java) ist ein Gerüst für eine ausführbare Klasse. Hier soll
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die Simulation analog zur Klasse `Simulation` implementiert werden (damit Sie Ihre [ursprüngliche
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Datei](../src/Simulation.java) nicht überschreiben müssen).
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- [Aufgabe4Test](../src/Aufgabe4Test.java) ist eine vorgegebene Klasse, die Sie zum Testen Ihrer
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Implementierung verwenden sollten. Bei einer fehlerfreien Implementierung sollten bei der
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Ausführung dieser Klasse keine Exceptions geworfen werden und alle Tests als erfolgreich ("successful")
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ausgegeben werden. Entfernen Sie die Kommentarzeichen, um diese Klasse verwenden zu können. Sie
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müssen diese Klasse nicht weiter verändern, können aber eigene Testfälle hinzufügen.
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## Aufgaben
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Ihre Aufgaben sind folgende:
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**1. Implementierung von `CosmicSystem` in `NamedBodyForcePair`:**
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Fügen Sie in der Klasse `Body` eine öffentliche Methode `massCenter()` hinzu, die die
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Position des Himmelskörpers liefert.
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Definieren Sie die Klasse `NamedBodyForcePair` so, dass sie das Interface `CosmicSystem`
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implementiert. Die Methoden `getMass()` und `getMassCenter()` geben lediglich die Masse bzw.
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Position des Himmelskörpers zurück.
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**2. Implementierung von `CosmicSystem` in `HierarchicalSystem`:**
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Definieren Sie die Klasse `HierarchicalSystem` so, dass sie das Interface `CosmicSystem` implementiert.
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Die Klasse repräsentiert ein hierarchisch aufgebautes kosmisches System von Himmelskörpern.
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Ein solches System besteht aus einem zentralen Himmelskörper und beliebig vielen weiteren
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kosmischen Systemen, die sich im Orbit um diesen zentralen Himmelskörper befinden. Neben der
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Spezifikationen in `CosmicSystem` beachten Sie bitte folgende spezielle Anforderungen und Hinweise
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für die Implementierung:
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- `toString()`: diese Methode soll eine textuelle Beschreibung der Hierarchie von Himmelskörpern
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und Subsystemen liefern. Dafür wird der Namen des zentralen Himmelskörpers eines Systems
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gefolgt von den Objekten im Orbit jeweils in {}-Klammern repräsentiert. Beispiel:
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`"Sun {Mercury, Venus, Earth {Moon} , Mars {Deimos, Phobos} , Vesta, Pallas, Hygiea, Ceres}"`
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- `numberOfBodies()`: diese Methode liefert die Gesamtanzahl aller Himmelskörper (nicht Systeme)
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im System bzw. Himmelskörper, das heißt alle Objekte vom Typ `NamedBodyForcePair`. Das oben genannte
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Beispiel-System besteht z.B. aus 12 Himmelskörpern, das Mars-System im Orbit der Sonne jedoch nur
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aus 3.
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- `getMass()`: diese Methode liefert die Summe der Massen aller Himmelskörper im System.
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- `getMassCenter()`: diese Methode liefert den Schwerpunkt aller Himmelskörper im System. Dieser
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entspricht dem mit den Massen gewichteten Mittelwert aller Positionen, es müssen daher alle Positionen
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mit der jeweiligen Masse multipliziert und aufsummiert werden und das Resultat durch die Summe aller
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Massen dividiert werden. Nutzen Sie dafür die bereits implementierten Rechenoperationen in `Vector3`.
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- `addForceFrom(Body b)` aktualisiert für jedes `NamedBodyForcePair`-Objekt in `this` die Kraft,
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indem die von `b` auf das `NamedBodyForcePair`-Objekt ausgeübte Kraft zur Kraft hinzuaddiert wird.
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- `addForceTo(CosmicSystem cs)` aktualisiert für jedes `NamedBodyForcePair`-Objekt in `cs` die
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Kraft, indem alle Kräfte die von Körpern aus `this` auf das `NamedBodyForcePair`-Objekt
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ausgeübt werden, zur Kraft im Objekt hinzuaddiert werden. Beispiel: Die
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Anweisung `cs.addForce(cs)` aktualisiert alle wechselseitigen im System `cs` wirkenden Kräfte.
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- `update()` führt auf Basis der gespeicherten Kräfte alle Bewegungen im System `this` durch und
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setzt danach alle Kräfte wieder auf den null-Vektor zurück.
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- `getBodies()` liefert eine Liste (Typ: `BodyLinkedList`) mit allen Himmelskörpern aus `this`.
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**3. Implementierung von `Simulation4`:**
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Implementieren Sie die Simulationsschleife unter Verwendung eines Objekts vom Typ
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`HierachicalSystem`. Alle Berechnungen sollen mittels Methoden von `CosmicSystem` durchgeführt
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werden.
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### Hinweise: ###
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- Nutzen Sie für die Implementierung dieser Methoden Rekursion sowie das Konzept des _dynamischen Bindens_.
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Da `NamedBodyForcePair` und `HierarchicalSystem` Untertypen von `CosmicSystem` sind, haben sie
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jeweils eine eigene Implementierung der in `CosmicSystem` definierten Methoden und es wird zur
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Laufzeit entschieden, von welchem dynamischen Typ ein Objekt ist und welche Methode somit ausgeführt
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wird. Sie dürfen hier keine Typumwandlungen (Casts) und auch nicht die Methoden `getClass()` und
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`instanceOf()` verwenden.
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- Es ist möglich, aber nicht verlangt, `addForceTo(CosmicSystem cs)` ohne Verwendung von
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`getBodies()` zu implementieren. Dazu kann in `addForceTo(CosmicSystem cs)` der Zugriff auf
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die eizelnen Körper in `cs` dadurch erreicht werden, dass `this` für alle seine Himmelskörper
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und Untersysteme `addForceTo(cs)` aufruft. Wird beim rekursiven Abstieg ein einzelner Himmelskörper
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erreicht (Blattknoten) ruft dieser `cs.addForceFrom(this)` auf.
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- Achten Sie bei der Berechnung der Kräfte in `addForceFrom(Body b)` darauf, dass die Kraft nicht
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verändert wird, wenn `this` und `b` derselbe Himmelskörper sind.
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#### _Punkteaufteilung_
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- Implementierung von `CosmicSystem` in `NamedBodyForcePair`: 1.5 Punkte
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- Implementierung von `CosmicSystem` in `HierarchicalSystem`: 2.5 Punkte
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- Implementierung von `Simulation4`: 1 Punkte
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- Gesamt: 5 Punkte
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205
src/Aufgabe4Test.java
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.HashSet;
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public class Aufgabe4Test {
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public static void main(String[] args) {
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//TODO: uncomment for testing
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/*
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//test classes HierachicalSystem and NamedBodyForcePair
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// create 12 bodies
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Body sun1, earth1, moon1, mars1, deimos1, phobos1, mercury1, venus1, vesta1, pallas1,
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hygiea1, ceres1;
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NamedBodyForcePair sun2, mercury2, venus2, earth2, moon2, mars2, deimos2, phobos2, vesta2,
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pallas2, hygiea2, ceres2;
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sun1 = new Body(1.989E30, new Vector3(0.0,0.0,0.0), new Vector3(0.0,0.0,
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0.0));
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earth1 = new Body(5.972E24, new Vector3(-6.13135922534815E10,-1.383789852227691E11,
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2.719682263474911E7), new Vector3(26832.720535473603,-11948.23168764519,1.9948243075997851));
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moon1 = new Body(7.349E22, new Vector3(-6.132484773775896E10,-1.387394951280871E11,
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1.701046736294776E7), new Vector3(27916.62329282941,-12020.39526008238,-94.89703264508708));
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mars1 = new Body(6.41712E23, new Vector3(-1.7923193702925848E11,1.726665823982123E11
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,7.991673845249474E9), new Vector3(-15925.78496403673,-15381.16179928219,68.67560910598857));
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deimos1 = new Body(1.8E20, new Vector3(-1.792255010450533E11,1.726891122683271E11,
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7.990659337380297E9), new Vector3(-17100.476719804457,-15020.348656808,631.2927851249581));
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phobos1 = new Body(1.08E20, new Vector3(-1.792253482539647E11,1.72661109673625E11,
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7.987848354800322E9), new Vector3(-14738.203714241401,-13671.17675223948,-411.0012490555253));
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mercury1 = new Body(3.301E23, new Vector3(-5.167375560011926E10,
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-4.217574885682655E10,1.14808913958168E9), new Vector3(21580.25398577148,-34951.03632847389,-4835.225596525241));
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venus1 = new Body(4.86747E24, new Vector3(-3.123150865740532E10,
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1.0395568504115701E11,3.173401325838074E9), new Vector3(-33748.180519629335,-10014.25141045021,1809.94488874165));
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vesta1 = new Body(2.5908E20, new Vector3(-3.337493557929893E11,
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-4.7147908276077385E10,4.1923010146878105E10), new Vector3(4440.54247538484,-19718.49074006637,48.06573124543601));
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pallas1 = new Body(2.14E20, new Vector3(4.3452066613895575E11,-2.057319365171432E11,
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1.0549957423213101E11), new Vector3(5058.947582097117,11184.45711782372,-8183.524138259704));
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hygiea1 = new Body(8.32E19, new Vector3(-3.983943433707043E11,2.325833000024021E11,
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-2.233667695713672E10), new Vector3(-6931.864585548552,-15686.8108598699,-690.5791992347208));
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ceres1 = new Body(9.394E20, new Vector3(3.781372641419032E11,1.96718960466285E11,
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-6.366459168068592E10), new Vector3(-8555.324226752316,14718.33755980907,2040.230135060142));
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Body[] bodies = new Body[]{sun1, mercury1, venus1, earth1, moon1, mars1, deimos1, phobos1,
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vesta1, pallas1, hygiea1, ceres1};
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Vector3[] forceOnBody = new Vector3[bodies.length];
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// create the same 12 named body-force pairs
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sun2 = new NamedBodyForcePair("Sun",1.989E30, new Vector3(0.0,0.0,0.0)
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, new Vector3(0.0,0.0,0.0));
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earth2 = new NamedBodyForcePair("Earth",5.972E24,
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new Vector3(-6.13135922534815E10,-1.383789852227691E11,2.719682263474911E7), new Vector3(26832.720535473603,-11948.23168764519,1.9948243075997851));
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moon2 = new NamedBodyForcePair("Moon",7.349E22,
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new Vector3(-6.132484773775896E10,-1.387394951280871E11,1.701046736294776E7), new Vector3(27916.62329282941,-12020.39526008238,-94.89703264508708));
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mars2 = new NamedBodyForcePair("Mars",6.41712E23,
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new Vector3(-1.7923193702925848E11,1.726665823982123E11,7.991673845249474E9), new Vector3(-15925.78496403673,-15381.16179928219,68.67560910598857));
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deimos2 = new NamedBodyForcePair("Deimos",1.8E20,
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new Vector3(-1.792255010450533E11,1.726891122683271E11,7.990659337380297E9), new Vector3(-17100.476719804457,-15020.348656808,631.2927851249581));
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phobos2 = new NamedBodyForcePair("Phobos",1.08E20,
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new Vector3(-1.792253482539647E11,1.72661109673625E11,7.987848354800322E9), new Vector3(-14738.203714241401,-13671.17675223948,-411.0012490555253));
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mercury2 = new NamedBodyForcePair("Mercury",3.301E23,
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new Vector3(-5.167375560011926E10,-4.217574885682655E10,1.14808913958168E9), new Vector3(21580.25398577148,-34951.03632847389,-4835.225596525241));
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venus2 = new NamedBodyForcePair("Venus",4.86747E24,
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new Vector3(-3.123150865740532E10,1.0395568504115701E11,3.173401325838074E9), new Vector3(-33748.180519629335,-10014.25141045021,1809.94488874165));
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vesta2 = new NamedBodyForcePair("Vesta",2.5908E20,
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new Vector3(-3.337493557929893E11,-4.7147908276077385E10,4.1923010146878105E10), new Vector3(4440.54247538484,-19718.49074006637,48.06573124543601));
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pallas2 = new NamedBodyForcePair("Pallas",2.14E20,
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new Vector3(4.3452066613895575E11,-2.057319365171432E11,1.0549957423213101E11), new Vector3(5058.947582097117,11184.45711782372,-8183.524138259704));
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hygiea2 = new NamedBodyForcePair("Hygiea",8.32E19,
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new Vector3(-3.983943433707043E11,2.325833000024021E11,-2.233667695713672E10), new Vector3(-6931.864585548552,-15686.8108598699,-690.5791992347208));
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ceres2 = new NamedBodyForcePair("Ceres",9.394E20,
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new Vector3(3.781372641419032E11,1.96718960466285E11,-6.366459168068592E10), new Vector3(-8555.324226752316,14718.33755980907,2040.230135060142));
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NamedBodyForcePair[] pairs = new NamedBodyForcePair[] {sun2, mercury2, venus2, earth2,
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moon2, mars2, deimos2, phobos2,
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vesta2, pallas2, hygiea2, ceres2};
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// check basic functions of 'HierachicalSystem'
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System.out.println("Test1:");
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CosmicSystem earthSystem = new HierarchicalSystem(earth2, moon2);
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CosmicSystem marsSystem = new HierarchicalSystem(mars2, deimos2, phobos2);
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CosmicSystem solarSystem = new HierarchicalSystem(sun2, mercury2, venus2, earthSystem,
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marsSystem, vesta2, pallas2, hygiea2, ceres2);
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testValue(earthSystem.numberOfBodies(), 2);
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testValue(solarSystem.numberOfBodies(), 12);
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System.out.println("Test2:");
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System.out.println(solarSystem.toString());
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testValue(solarSystem.toString().contains("Mars"), true);
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testValue(solarSystem.toString().contains("Deimos"), true);
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testValue(solarSystem.toString().contains("Moon"), true);
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testValue(earthSystem.toString().contains("Moon"), true);
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testValue(earthSystem.toString().contains("Earth"), true);
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System.out.println("Test3:");
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testValue(solarSystem.getMass(),1.9890118865556799E30);
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System.out.println("Test4:");
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BodyLinkedList bl = solarSystem.getBodies();
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testValue(bl.size(),12);
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HashSet<Body> set = new HashSet<>();
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while(bl.size() > 0) {
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set.add(bl.pollFirst());
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}
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testValue(set.size(), 12);
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System.out.println("Test5:");
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for (int seconds = 0; seconds < 50000; seconds++) {
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// for each body (with index i): compute the total force exerted on it.
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for (int i = 0; i < bodies.length; i++) {
|
||||||
|
forceOnBody[i] = new Vector3(0, 0, 0); // begin with zero
|
||||||
|
for (int j = 0; j < bodies.length; j++) {
|
||||||
|
if (i != j) {
|
||||||
|
pairs[i].addForceTo(pairs[j]);
|
||||||
|
Vector3 forceToAdd = bodies[i].gravitationalForce(bodies[j]);
|
||||||
|
forceOnBody[i] = forceOnBody[i].plus(forceToAdd);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// now forceOnBody[i] holds the force vector exerted on body with index i.
|
||||||
|
|
||||||
|
// for each body (with index i): move it according to the total force exerted on it.
|
||||||
|
for (int i = 0; i < bodies.length; i++) {
|
||||||
|
bodies[i].move(forceOnBody[i]);
|
||||||
|
pairs[i].update();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
for (int i = 0; i < bodies.length; i++) {
|
||||||
|
testValue(bodies[i].massCenter().distanceTo(pairs[i].getMassCenter()),0);
|
||||||
|
}
|
||||||
|
|
||||||
|
System.out.println("Test6:");
|
||||||
|
sun2 = new NamedBodyForcePair("Sun",1.989E30, new Vector3(0.0,0.0,0.0)
|
||||||
|
, new Vector3(0.0,0.0,0.0));
|
||||||
|
earth2 = new NamedBodyForcePair("Earth",5.972E24,
|
||||||
|
new Vector3(-6.13135922534815E10,-1.383789852227691E11,2.719682263474911E7), new Vector3(26832.720535473603,-11948.23168764519,1.9948243075997851));
|
||||||
|
moon2 = new NamedBodyForcePair("Moon",7.349E22,
|
||||||
|
new Vector3(-6.132484773775896E10,-1.387394951280871E11,1.701046736294776E7), new Vector3(27916.62329282941,-12020.39526008238,-94.89703264508708));
|
||||||
|
mars2 = new NamedBodyForcePair("Mars",6.41712E23,
|
||||||
|
new Vector3(-1.7923193702925848E11,1.726665823982123E11,7.991673845249474E9), new Vector3(-15925.78496403673,-15381.16179928219,68.67560910598857));
|
||||||
|
deimos2 = new NamedBodyForcePair("Deimos",1.8E20,
|
||||||
|
new Vector3(-1.792255010450533E11,1.726891122683271E11,7.990659337380297E9), new Vector3(-17100.476719804457,-15020.348656808,631.2927851249581));
|
||||||
|
phobos2 = new NamedBodyForcePair("Phobos",1.08E20,
|
||||||
|
new Vector3(-1.792253482539647E11,1.72661109673625E11,7.987848354800322E9), new Vector3(-14738.203714241401,-13671.17675223948,-411.0012490555253));
|
||||||
|
mercury2 = new NamedBodyForcePair("Mercury",3.301E23,
|
||||||
|
new Vector3(-5.167375560011926E10,-4.217574885682655E10,1.14808913958168E9), new Vector3(21580.25398577148,-34951.03632847389,-4835.225596525241));
|
||||||
|
venus2 = new NamedBodyForcePair("Venus",4.86747E24,
|
||||||
|
new Vector3(-3.123150865740532E10,1.0395568504115701E11,3.173401325838074E9), new Vector3(-33748.180519629335,-10014.25141045021,1809.94488874165));
|
||||||
|
vesta2 = new NamedBodyForcePair("Vesta",2.5908E20,
|
||||||
|
new Vector3(-3.337493557929893E11,-4.7147908276077385E10,4.1923010146878105E10), new Vector3(4440.54247538484,-19718.49074006637,48.06573124543601));
|
||||||
|
pallas2 = new NamedBodyForcePair("Pallas",2.14E20,
|
||||||
|
new Vector3(4.3452066613895575E11,-2.057319365171432E11,1.0549957423213101E11), new Vector3(5058.947582097117,11184.45711782372,-8183.524138259704));
|
||||||
|
hygiea2 = new NamedBodyForcePair("Hygiea",8.32E19,
|
||||||
|
new Vector3(-3.983943433707043E11,2.325833000024021E11,-2.233667695713672E10), new Vector3(-6931.864585548552,-15686.8108598699,-690.5791992347208));
|
||||||
|
ceres2 = new NamedBodyForcePair("Ceres",9.394E20,
|
||||||
|
new Vector3(3.781372641419032E11,1.96718960466285E11,-6.366459168068592E10), new Vector3(-8555.324226752316,14718.33755980907,2040.230135060142));
|
||||||
|
|
||||||
|
pairs = new NamedBodyForcePair[] {sun2, mercury2, venus2, earth2,
|
||||||
|
moon2, mars2, deimos2, phobos2,
|
||||||
|
vesta2, pallas2, hygiea2, ceres2};
|
||||||
|
HierarchicalSystem hs = new HierarchicalSystem(sun2, mercury2, venus2,
|
||||||
|
new HierarchicalSystem(earth2, moon2), new HierarchicalSystem(mars2, deimos2,
|
||||||
|
phobos2), vesta2, pallas2, hygiea2, ceres2);
|
||||||
|
|
||||||
|
for (int seconds = 0; seconds < 50000; seconds++) {
|
||||||
|
hs.addForceTo(hs);
|
||||||
|
hs.update();
|
||||||
|
}
|
||||||
|
|
||||||
|
for (int i = 0; i < bodies.length; i++) {
|
||||||
|
testValue(bodies[i].massCenter().distanceTo(pairs[i].getMassCenter()),0);
|
||||||
|
}
|
||||||
|
*/ //TODO: uncomment
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void testComparison(Object first, Object second, boolean expected) {
|
||||||
|
boolean real = first == second;
|
||||||
|
|
||||||
|
if (real == expected) {
|
||||||
|
System.out.println("Successful comparison");
|
||||||
|
} else {
|
||||||
|
System.out.println("Comparison NOT successful! Expected value: " + expected + " / Given value: " + real);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void testValue(Object given, Object expected) {
|
||||||
|
if (given == expected) {
|
||||||
|
System.out.println("Successful test");
|
||||||
|
} else {
|
||||||
|
System.out.println("Test NOT successful! Expected value: " + expected + " / Given value: " + given);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void testValue(double given, double expected) {
|
||||||
|
if (given < expected + (expected + 1) / 1e12 && given > expected - (expected + 1) / 1e12) {
|
||||||
|
System.out.println("Successful test");
|
||||||
|
} else {
|
||||||
|
System.out.println("Test NOT successful! Expected value: " + expected + " / Given value: " + given);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
41
src/CosmicSystem.java
Normal file
41
src/CosmicSystem.java
Normal file
@ -0,0 +1,41 @@
|
|||||||
|
// A representation of a system of bodies with associated forces. Provides methods
|
||||||
|
// for computing current mutual forces, updating the positions of bodies and drawing
|
||||||
|
// the bodies in a CodeDraw object.
|
||||||
|
//
|
||||||
|
public interface CosmicSystem extends Drawable {
|
||||||
|
|
||||||
|
// Returns a readable representation of this system.
|
||||||
|
String toString();
|
||||||
|
|
||||||
|
// Returns the mass center of this system.
|
||||||
|
Vector3 getMassCenter();
|
||||||
|
|
||||||
|
// Returns the overall mass of this system.
|
||||||
|
double getMass();
|
||||||
|
|
||||||
|
// Returns the overall number of bodies contained in this system.
|
||||||
|
int numberOfBodies();
|
||||||
|
|
||||||
|
// Returns the distance between the mass centers of 'this' and the specified system.
|
||||||
|
//Precondition: cs != null
|
||||||
|
double distanceTo(CosmicSystem cs);
|
||||||
|
|
||||||
|
// Adds the force that the specified body exerts on each of this systems bodies to each of this
|
||||||
|
// systems bodies.
|
||||||
|
// Precondition: b != null
|
||||||
|
void addForceFrom(Body b);
|
||||||
|
|
||||||
|
// Adds the force that this system exerts on each of the bodies of 'cs' to the bodies in 'cs'.
|
||||||
|
// For exact computations this means that for each body of 'this' its force on each body of
|
||||||
|
// 'cs' is added to this body of 'cs'.
|
||||||
|
// Precondition: cs != null
|
||||||
|
void addForceTo(CosmicSystem cs);
|
||||||
|
|
||||||
|
// Returns a list with all the bodies of 'this'. The order is not defined.
|
||||||
|
BodyLinkedList getBodies();
|
||||||
|
|
||||||
|
// Moves each of the bodies of 'this' according to the previously accumulated forces and
|
||||||
|
// resets all forces to zero.
|
||||||
|
void update();
|
||||||
|
|
||||||
|
}
|
||||||
10
src/Drawable.java
Normal file
10
src/Drawable.java
Normal file
@ -0,0 +1,10 @@
|
|||||||
|
import codedraw.CodeDraw;
|
||||||
|
|
||||||
|
// An object that can be drawn in a CodeDraw canvas.
|
||||||
|
//
|
||||||
|
public interface Drawable {
|
||||||
|
|
||||||
|
//draws the object into the canvas 'cd'
|
||||||
|
//Precondition: cd != null
|
||||||
|
void draw(CodeDraw cd);
|
||||||
|
}
|
||||||
14
src/HierarchicalSystem.java
Normal file
14
src/HierarchicalSystem.java
Normal file
@ -0,0 +1,14 @@
|
|||||||
|
// A cosmic system that is composed of a central named body (of type 'NamedBodyForcePair')
|
||||||
|
// and an arbitrary number of subsystems (of type 'HierarchicalSystem') in its orbit.
|
||||||
|
// This class implements 'CosmicSystem'.
|
||||||
|
//
|
||||||
|
public class HierarchicalSystem /* TODO: add clause */ {
|
||||||
|
|
||||||
|
// TODO: define missing parts of this class.
|
||||||
|
|
||||||
|
// Initializes this system with a name and a central body.
|
||||||
|
public HierarchicalSystem(NamedBodyForcePair central, CosmicSystem... inOrbit) {
|
||||||
|
// TODO: implement constructor.
|
||||||
|
|
||||||
|
}
|
||||||
|
}
|
||||||
21
src/NamedBodyForcePair.java
Normal file
21
src/NamedBodyForcePair.java
Normal file
@ -0,0 +1,21 @@
|
|||||||
|
// A body with a name and an associated force. The leaf node of
|
||||||
|
// a hierarchical cosmic system. This class implements 'CosmicSystem'.
|
||||||
|
//
|
||||||
|
public class NamedBodyForcePair /* TODO: add clause */ {
|
||||||
|
|
||||||
|
// TODO: define missing parts of this class.
|
||||||
|
|
||||||
|
// Initializes this with name, mass, current position and movement. The associated force
|
||||||
|
// is initialized with a zero vector.
|
||||||
|
public NamedBodyForcePair(String name, double mass, Vector3 massCenter, Vector3 currentMovement) {
|
||||||
|
// TODO: implement constructor.
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
// Returns the name of the body.
|
||||||
|
public String getName() {
|
||||||
|
// TODO: implement method.
|
||||||
|
return "";
|
||||||
|
|
||||||
|
}
|
||||||
|
}
|
||||||
53
src/Simulation4.java
Normal file
53
src/Simulation4.java
Normal file
@ -0,0 +1,53 @@
|
|||||||
|
import codedraw.CodeDraw;
|
||||||
|
|
||||||
|
import java.awt.*;
|
||||||
|
|
||||||
|
// Simulates the formation of a massive solar system.
|
||||||
|
//
|
||||||
|
public class Simulation4 {
|
||||||
|
|
||||||
|
// gravitational constant
|
||||||
|
public static final double G = 6.6743e-11;
|
||||||
|
|
||||||
|
// one astronomical unit (AU) is the average distance of earth to the sun.
|
||||||
|
public static final double AU = 150e9; // meters
|
||||||
|
|
||||||
|
// one light year
|
||||||
|
public static final double LY = 9.461e15; // meters
|
||||||
|
|
||||||
|
// some further constants needed in the simulation
|
||||||
|
public static final double SUN_MASS = 1.989e30; // kilograms
|
||||||
|
public static final double SUN_RADIUS = 696340e3; // meters
|
||||||
|
public static final double EARTH_MASS = 5.972e24; // kilograms
|
||||||
|
public static final double EARTH_RADIUS = 6371e3; // meters
|
||||||
|
|
||||||
|
// set some system parameters
|
||||||
|
public static final double SECTION_SIZE = 10 * AU; // the size of the square region in space
|
||||||
|
|
||||||
|
// all quantities are based on units of kilogram respectively second and meter.
|
||||||
|
|
||||||
|
// The main simulation method using instances of other classes.
|
||||||
|
public static void main(String[] args) {
|
||||||
|
|
||||||
|
// simulation
|
||||||
|
CodeDraw cd = new CodeDraw();
|
||||||
|
|
||||||
|
// create solar system with 12 bodies
|
||||||
|
NamedBodyForcePair sun = new NamedBodyForcePair("Sun",1.989E30, new Vector3(0.0,0.0,0.0), new Vector3(0.0,0.0,0.0));
|
||||||
|
NamedBodyForcePair earth = new NamedBodyForcePair("Earth",5.972E24, new Vector3(-6.13135922534815E10,-1.383789852227691E11,2.719682263474911E7), new Vector3(26832.720535473603,-11948.23168764519,1.9948243075997851));
|
||||||
|
NamedBodyForcePair moon = new NamedBodyForcePair("Moon",7.349E22, new Vector3(-6.132484773775896E10,-1.387394951280871E11,1.701046736294776E7), new Vector3(27916.62329282941,-12020.39526008238,-94.89703264508708));
|
||||||
|
NamedBodyForcePair mars = new NamedBodyForcePair("Mars",6.41712E23, new Vector3(-1.7923193702925848E11,1.726665823982123E11,7.991673845249474E9), new Vector3(-15925.78496403673,-15381.16179928219,68.67560910598857));
|
||||||
|
NamedBodyForcePair deimos = new NamedBodyForcePair("Deimos",1.8E20, new Vector3(-1.792255010450533E11,1.726891122683271E11,7.990659337380297E9), new Vector3(-17100.476719804457,-15020.348656808,631.2927851249581));
|
||||||
|
NamedBodyForcePair phobos = new NamedBodyForcePair("Phobos",1.08E20, new Vector3(-1.792253482539647E11,1.72661109673625E11,7.987848354800322E9), new Vector3(-14738.203714241401,-13671.17675223948,-411.0012490555253));
|
||||||
|
NamedBodyForcePair mercury = new NamedBodyForcePair("Mercury",3.301E23, new Vector3(-5.167375560011926E10,-4.217574885682655E10,1.14808913958168E9), new Vector3(21580.25398577148,-34951.03632847389,-4835.225596525241));
|
||||||
|
NamedBodyForcePair venus = new NamedBodyForcePair("Venus",4.86747E24, new Vector3(-3.123150865740532E10,1.0395568504115701E11,3.173401325838074E9), new Vector3(-33748.180519629335,-10014.25141045021,1809.94488874165));
|
||||||
|
NamedBodyForcePair vesta = new NamedBodyForcePair("Vesta",2.5908E20, new Vector3(-3.337493557929893E11,-4.7147908276077385E10,4.1923010146878105E10), new Vector3(4440.54247538484,-19718.49074006637,48.06573124543601));
|
||||||
|
NamedBodyForcePair pallas = new NamedBodyForcePair("Pallas",2.14E20, new Vector3(4.3452066613895575E11,-2.057319365171432E11,1.0549957423213101E11), new Vector3(5058.947582097117,11184.45711782372,-8183.524138259704));
|
||||||
|
NamedBodyForcePair hygiea = new NamedBodyForcePair("Hygiea",8.32E19, new Vector3(-3.983943433707043E11,2.325833000024021E11,-2.233667695713672E10), new Vector3(-6931.864585548552,-15686.8108598699,-690.5791992347208));
|
||||||
|
NamedBodyForcePair ceres = new NamedBodyForcePair("Ceres",9.394E20, new Vector3(3.781372641419032E11,1.96718960466285E11,-6.366459168068592E10), new Vector3(-8555.324226752316,14718.33755980907,2040.230135060142));
|
||||||
|
|
||||||
|
//TODO: implementation of this method according to 'Aufgabenblatt4.md'.
|
||||||
|
|
||||||
|
|
||||||
|
}
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user