3 files changed, 147 insertions, 0 deletions

diff --git a/ws2015/eip/blaetter/06/Polygon.java b/ws2015/eip/blaetter/06/Polygon.java
new file mode 100644
index 0000000..461fcc6
--- /dev/null
+++ b/ws2015/eip/blaetter/06/Polygon.java
@@ -0,0 +1,106 @@
+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()));
+            }
+    }
+}
diff --git a/ws2015/eip/blaetter/06/Test.java b/ws2015/eip/blaetter/06/Test.java
new file mode 100644
index 0000000..c8232a2
--- /dev/null
+++ b/ws2015/eip/blaetter/06/Test.java
@@ -0,0 +1,40 @@
+import gameoflifetest.GraphicsWindow;
+
+class Test {
+    public static void main (String[] args)
+    {
+        GraphicsWindow gw = new GraphicsWindow();
+
+        Position[] points = { new Position(10, 10)
+                              , new Position(20, 10)
+                              , new Position(30, 10)
+                              , new Position(30, 20)
+                              , new Position(20, 20)
+                              , new Position(10, 20)
+        };
+
+        Polygon p = new Polygon(points);
+
+        p.zeichneDich(gw);
+        gw.mouseClick();
+
+        p = p.translate(10, 10);
+        gw.clear();
+        p.zeichneDich(gw);
+        gw.mouseClick();
+
+        p = p.erweitere(new Position(5, 20));
+        gw.clear();
+        p.zeichneDich(gw);
+        gw.mouseClick();
+
+        p = p.reduziere(2);
+        gw.clear();
+        p.zeichneDich(gw);
+        gw.mouseClick();
+
+        System.out.format("%.2f\n", p.berechneFlaeche());
+        
+        System.exit(0);
+    }
+}
diff --git a/ws2015/eip/blaetter/06/manifest b/ws2015/eip/blaetter/06/manifest
new file mode 100644
index 0000000..f55b77f
--- /dev/null
+++ b/ws2015/eip/blaetter/06/manifest
@@ -0,0 +1 @@
+Polygon.java
\ No newline at end of file