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import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.ListIterator;
import java.util.Collection;
import java.awt.Point;
import gameoflifetest.GraphicsWindow;
class Polygon {
private final List<Position> points;
public Polygon (Position[] pointsPrime)
{
points = Arrays.asList(pointsPrime);
}
public Polygon (Collection<Position> pointsPrime)
{
points = new ArrayList<Position>(pointsPrime);
}
public Polygon translate (int dx, int dy)
{
ListIterator<Position> it = points.listIterator();
ArrayList<Position> translated = new ArrayList<Position>();
while (it.hasNext())
translated.add(it.next().translate(dx, dy));
return new Polygon(translated);
}
public Polygon erweitere (Position pos)
{
ArrayList<Position> extended = new ArrayList<Position>(points);
extended.add(pos);
return new Polygon(extended);
}
public Polygon reduziere (int n)
{
if (n == 0)
return new Polygon(new ArrayList<Position>());
List<Position> reduced = new ArrayList<Position>(points);
int c = 0;
for (int i = 0; i < points.size(); i++)
{
if (i % n == 1)
{
reduced.remove(i - c);
c++;
}
}
return new Polygon(reduced);
}
public boolean istGleichZu(Polygon other)
{
ListIterator<Position> itThis = points.listIterator();
ListIterator<Position> itOther = other.points.listIterator();
while (itThis.hasNext() && itOther.hasNext())
if (! itThis.next().istGleichZu(itOther.next()))
return false;
if (itThis.hasNext() || itOther.hasNext())
return false;
return true;
}
public double berechneFlaeche()
{
if (points.size() < 3)
return 0;
double area = 0;
for (int i = 0; i <= points.size(); i++)
{
Position r0 = points.get(i % points.size());
Position r1 = points.get((i + 1) % points.size());
area += 0.5 * ((r0.getX() + r1.getX()) * (r1.getY() - r0.getY()));
}
return area;
}
public void zeichneDich (GraphicsWindow gw)
{
for (int i = 0; i <= points.size(); i++)
{
Position r0 = points.get(i % points.size());
Position r1 = points.get((i + 1) % points.size());
gw.drawLine(new Point(r0.getX(), r0.getY()), new Point(r1.getX(), r1.getY()));
}
}
}
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