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diff --git a/src/main/scala/graphyx/graphics/Drawable.scala b/src/main/scala/graphyx/graphics/Drawable.scala
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+++ b/src/main/scala/graphyx/graphics/Drawable.scala
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+/*
+ * Graphyx
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package graphyx.graphics
+
+import sims.geometry._
+
+/**Enthaelt Methoden und Felder fuer graphische Darstellungen.
+ * Alle Klassen die dieses Trait implementieren koennen graphisch dargestellt werden.*/
+trait Drawable {
+  
+  /**Java Graphics Objekt zur graphischen Darstellung*/
+  var g: java.awt.Graphics2D = _
+  
+  /**Anzahl von Pixeln pro Meter.*/
+  var ppm: Double = 39.37007874015748 * 96 //ppm = i/m * p/i
+  
+  /**Skala in der die graphischen Objekte gezeichnet werden.*/
+  var scale: Double = 1.0/100.0
+  
+  /**Hoehe des Fensters in Pixeln.*/
+  var windowHeight = 0
+  
+  /**Korrigiert einen Y-Wert in Bildschirmkoordinaten zu seinem kartesischen Aequivalent.
+   * @param y zu korrigierender Wert*/
+  def correctY(y: Double) = windowHeight - y
+  
+  /**Malt eine Linie auf <code>g</code>.
+   * @param startPoint Startpunkt in Weltkoordinaten
+   * @param endPoint Endpunkt in Weltkoordinaten*/
+  def drawLine(startPoint: Vector2D, endPoint: Vector2D) = {
+    val x1 = startPoint.x * scale * ppm
+    val y1 = correctY(startPoint.y * scale * ppm)
+    val x2 = endPoint.x * scale * ppm
+    val y2 = correctY(endPoint.y * scale * ppm)
+    g.drawLine(x1.toInt, y1.toInt, x2.toInt, y2.toInt)
+  }
+  
+  /**Malt ein massives Polygon auf <code>g</code>.
+   * @param points Eckpunkte des Polygons in Weltkoordinaten*/
+  def fillPolygon(points: Seq[Vector2D]) = {
+    val xs = points map ((v: Vector2D) => (v.x * scale * ppm).toInt)
+    val ys = points map ((v: Vector2D) => correctY((v.y) * scale * ppm).toInt)
+    g.fillPolygon(xs.toArray, ys.toArray, points.length)
+  }
+  
+  /**Malt ein Polygon auf <code>g</code>.
+   * @param points Eckpunkte des Polygons in Weltkoordinaten*/
+  def drawPolygon(points: Seq[Vector2D]) = {
+    val xs = points map ((v: Vector2D) => (v.x * scale * ppm).toInt)
+    val ys = points map ((v: Vector2D) => correctY((v.y) * scale * ppm).toInt)
+    g.drawPolygon(xs.toArray, ys.toArray, points.length)
+  }
+  
+  /**Malt einen massiven Kreis auf <code>g</code>.
+   * @param center Mitte des Kreises in Weltkoordinaten
+   * @param radius Radius des Kreises*/
+  def fillCircle(center: Vector2D, radius: Double) = {
+    g.fillOval(((center.x - radius) * scale * ppm).toInt,
+               correctY((center.y + radius) * scale * ppm).toInt,
+               (radius * scale * ppm * 2).toInt,
+               (radius * scale * ppm * 2).toInt)
+  }
+  
+  /**Malt einen Kreis auf <code>g</code>.
+   * @param center Mitte des Kreises in Weltkoordinaten
+   * @param radius Radius des Kreises*/
+  def drawCircle(center: Vector2D, radius: Double) = {
+    g.drawOval(((center.x - radius) * scale * ppm).toInt,
+               correctY((center.y + radius) * scale * ppm).toInt,
+               (radius * scale * ppm * 2).toInt,
+               (radius * scale * ppm * 2).toInt)
+  }
+  
+  /**Malt einen Punkt auf <code>g</code>.
+   * <p>
+   * Der Punkt wird von einem Kreis umgeben.
+   * @param point Punkt in Weltkoordinaten*/
+  def drawPoint(point: Vector2D) = {
+    val radius = 4 //in pixel
+    g.drawLine((point.x * scale * ppm).toInt,
+               correctY(point.y * scale * ppm).toInt - radius,
+               (point.x * scale * ppm).toInt,
+               correctY(point.y * scale * ppm).toInt + radius)
+    g.drawLine((point.x * scale * ppm).toInt - radius,
+               correctY(point.y * scale * ppm).toInt,
+               (point.x * scale * ppm).toInt + radius,
+               correctY(point.y * scale * ppm).toInt)
+    g.drawOval((point.x * scale * ppm).toInt - radius,
+               correctY(point.y * scale * ppm).toInt - radius,
+               (radius * 2).toInt,
+               (radius * 2).toInt)
+    
+  }
+  
+  
+  /**Malt einen Vektor auf <code>g</code>.
+   * @param v Vektor in Weltkoordinaten
+   * @param p Ursprungspunkt in Weltkoordinaten
+   */
+  def drawVector(v: Vector2D, p: Vector2D) = {
+    if (!v.isNull) {
+     val ep = p + v
+     val a1 = ep - ((v.unit rotate (math.Pi / 6)) * 0.08)
+     val a2 = ep - ((v.unit rotate (-math.Pi / 6)) * 0.08)
+     
+     g.drawLine((p.x * scale * ppm).toInt, correctY(p.y * scale * ppm).toInt, (ep.x * scale * ppm).toInt, correctY(ep.y * scale * ppm).toInt)
+     g.drawLine((a1.x * scale * ppm).toInt, correctY(a1.y * scale * ppm).toInt, (ep.x * scale * ppm).toInt, correctY(ep.y * scale * ppm).toInt)
+     g.drawLine((a2.x * scale * ppm).toInt, correctY(a2.y * scale * ppm).toInt, (ep.x * scale * ppm).toInt, correctY(ep.y * scale * ppm).toInt) 
+    }
+  }
+  
+  /**Stellt das graphische Objekt dar.*/
+  def draw(): Unit
+}