From da7761a4269b0f0d277be02fa1b5cc82e35295f4 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Thu, 26 Nov 2015 07:21:47 +0000
Subject: EiP H6-1

---
 ws2015/eip/blaetter/06/Polygon.java | 106 ++++++++++++++++++++++++++++++++++++
 ws2015/eip/blaetter/06/Test.java    |  40 ++++++++++++++
 ws2015/eip/blaetter/06/manifest     |   1 +
 3 files changed, 147 insertions(+)
 create mode 100644 ws2015/eip/blaetter/06/Polygon.java
 create mode 100644 ws2015/eip/blaetter/06/Test.java
 create mode 100644 ws2015/eip/blaetter/06/manifest

(limited to 'ws2015')

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
-- 
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