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DistanceComparator.java
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DistanceComparator.java
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package com.cdm.view.elements;
import java.util.Comparator;
import com.cdm.view.Position;
import com.cdm.view.enemy.EnemyUnit;
public class DistanceComparator implements Comparator<EnemyUnit> {
private Position base;
public DistanceComparator(Position position) {
base = position;
}
@Override
public int compare(EnemyUnit arg0, EnemyUnit arg1) {
Position a = arg0.getPosition();
Position b = arg1.getPosition();
if (a.getSystem().equals(b.getSystem())
&& base.getSystem().equals(a.getSystem())) {
// faster - less memory use
float dx = (a.x - base.x);
float dy = (a.y - base.y);
float d0 = (float) Math.sqrt(dx * dx + dy * dy);
dx = (b.x - base.x);
dy = (b.y - base.y);
float d1 = (float) Math.sqrt(dx * dx + dy * dy);
if (d0 < d1)
return -1;
if (d0 > d1)
return 1;
return 0;
}
float distA = a.distance(base);
float distB = b.distance(base);
if (distA < distB)
return -1;
if (distA > distB)
return 1;
return 0;
}
}