Adding AStar Algorithm

This commit is contained in:
i23007 2024-07-03 21:49:51 +02:00
parent 26bd4bbb3a
commit 58ed89d78c
7 changed files with 123 additions and 12 deletions

51
.idea/workspace.xml generated
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@ -4,7 +4,16 @@
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<change beforePath="$PROJECT_DIR$/graph/DirectedGraph.java" beforeDir="false" afterPath="$PROJECT_DIR$/graph/DirectedGraph.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/graph/Graph.java" beforeDir="false" afterPath="$PROJECT_DIR$/graph/Graph.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/graph/UndirectedGraph.java" beforeDir="false" afterPath="$PROJECT_DIR$/graph/UndirectedGraph.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/out/production/ProjektGraph/OurApplication/OurAlgorithm.class" beforeDir="false" afterPath="$PROJECT_DIR$/out/production/ProjektGraph/OurApplication/OurAlgorithm.class" afterDir="false" />
<change beforePath="$PROJECT_DIR$/out/production/ProjektGraph/graph/DirectedGraph.class" beforeDir="false" afterPath="$PROJECT_DIR$/out/production/ProjektGraph/graph/DirectedGraph.class" afterDir="false" />
<change beforePath="$PROJECT_DIR$/out/production/ProjektGraph/graph/Graph.class" beforeDir="false" afterPath="$PROJECT_DIR$/out/production/ProjektGraph/graph/Graph.class" afterDir="false" />
<change beforePath="$PROJECT_DIR$/out/production/ProjektGraph/graph/UndirectedGraph.class" beforeDir="false" afterPath="$PROJECT_DIR$/out/production/ProjektGraph/graph/UndirectedGraph.class" afterDir="false" />
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@ -12,6 +21,7 @@
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@ -22,16 +32,16 @@
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&quot;git-widget-placeholder&quot;: &quot;Versuch__Christian&quot;,
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@ -58,7 +68,23 @@
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<updated>1720028543313</updated>
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@ -74,6 +100,7 @@
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@ -257,6 +257,86 @@ public class DirectedGraph<T extends VertexMarking, U extends EdgeMarking> exten
}
}
System.out.println("Done");
// Gibt Distanz zu gefragtem Knoten zurück
return distance.get(n2);
}
public int getShortestPathAStar(MarkedVertex<T> n1, MarkedVertex<T> n2) {
// Erstellt Hashmap um Distanz von Startnoten zu jedem Knoten auf dem Graph zu tracken
// Erstellt Hashmap um zu tracken welche Knoten schon besucht wurden
// Initialisierung aller Distanzen auf UNENDLICH (= -1)
// Initialisierung, dass kein Knoten besucht wurde
HashMap<MarkedVertex<T>, Integer> distance = new HashMap<>();
HashMap<MarkedVertex<T>, Boolean> visited = new HashMap<>();
for (MarkedVertex<T> i: this.getAllVertexes()) {
distance.put(i, -1);
visited.put(i, false);
}
// Erstelle Schlange wo die nächsten Verbindungen drin sind
PriorityQueue<WrapperElement<T>> queue = new PriorityQueue<>(new WrapperComparator<T>());
// Distanz zu Startknoten auf 0
// Weg zu Startknoten in die Schlange aufnehmen
distance.put(n1, 0);
queue.add(new WrapperElement<>(n1, 0));
// Variable, die Distanz zwischen aktuellem Knoten und Nachfolger speichert
int dist = 0;
// Variable, die Distanz zwischen dem potenziell nächsten Knoten und dem Zielknoten speichert
int airDist = 0;
// Zähler für LogList
int step = 0;
visualizationElements.Graph display;
while (!queue.isEmpty()) {
// Den nächsten Knoten, der am wenigsten kostet, besuchen
WrapperElement<T> nextVertex = queue.poll();
// Knoten als besucht makieren
visited.put(nextVertex.getElement(), true);
// Logging
System.out.println("Visit " + nextVertex.getElement().getName());
this.logList.add(new OurLogElement(step, "Step: " + step, 0, nextVertex.getElement().getScreenVertex()));
// Gehe von diesem Knoten aus alle erreichbaren Knoten durch
for (MarkedVertex<T> i: this.getSuccessors(nextVertex.getElement())) {
// Kante finde, die den jetzigen und nächsten Knoten verbindet
for (MarkedEdge<U> j: this.getAllEdges()) {
if (j.getSource() == nextVertex.getElement() && j.getDestination() == i) {
//Berechnung der Heuristik über die Luftdistanz des nächsten Knoten zum Zielknoten
airDist = (int) Math.sqrt(Math.pow((i.getCords()[0] - n2.getCords()[0]), 2)
+ Math.pow((i.getCords()[1] - n2.getCords()[1]), 2));
// Berechne Distanz zu nächstem Knoten
dist = distance.get(nextVertex.getElement()) + j.getWeighting() + airDist;
break;
}
}
// Wenn es schon einen kürzeren Weg zum Knoten gibt, überspringen
if ((distance.get(i) <= dist && distance.get(i) != -1) || visited.get(i)) {
continue;
}
// Aktualisiere Distanz von Start zu nächstem Knoten
distance.put(i, dist);
// Logging
System.out.println("Add " + i.getName() + " with " + dist + " weight to queue.");
this.logList.add(new OurLogElement(step, "Step: " + step, 0, nextVertex.getElement().getScreenVertex()));
// Nehme nächsten Knoten in die Queue auf
queue.add(new WrapperElement<>(i, dist));
}
}
System.out.println("Done");
// Gibt Distanz zu gefragtem Knoten zurück
return distance.get(n2);

View File

@ -267,4 +267,5 @@ public abstract class Graph<T extends VertexMarking, U extends EdgeMarking> {
public abstract int getShortestPathDijkstra(MarkedVertex<T> n1, MarkedVertex<T> n2);
public abstract int getShortestPathAStar(MarkedVertex<T> n1, MarkedVertex<T> n2);
}

View File

@ -121,5 +121,8 @@ public class UndirectedGraph<T extends VertexMarking, U extends EdgeMarking> ext
public int getShortestPathDijkstra(MarkedVertex<T> n1, MarkedVertex<T> n2) {
return 1;
}
public int getShortestPathAStar(MarkedVertex<T> n1, MarkedVertex<T> n2) {
return 2;
}
}