diff --git a/htroot/AccessGrid_p.html b/htroot/AccessGrid_p.html
index 339c99e9f..e4e6cfe8e 100644
--- a/htroot/AccessGrid_p.html
+++ b/htroot/AccessGrid_p.html
@@ -11,7 +11,7 @@
 
   <script type="text/javascript">
   <!--
-    imagestub = "AccessPicture_p.png?width=1024&height=576&bgcolor=FFFFFF&ct=5000&coronaangle=";
+    imagestub = "AccessPicture_p.png?width=1024&height=576&colorback=FFFFFF&amp;colortext=AAAAAA&amp;colorgrid=333333&amp;colordot=33CC33&amp;colorline=555555&ct=5000&coronaangle=";
     imageanimindex = 0;
     imageloadindex = 0;
     imagecycles = 0;
@@ -53,7 +53,7 @@
     <p>This images shows incoming connections to your YaCy peer and outgoing connections from your peer to other peers and web servers</p>
     <div class="left">
       <p>
-        <a href="AccessPicture_p.png?width=1024&amp;height=576&amp;bgcolor=FFFFFF"><img id="AccessPicture" src="AccessPicture_p.png?width=1024&amp;height=576&amp;bgcolor=FFFFFF&amp;coronaangle=0" alt="YaCy Access Grid" width="1024" height="576" /></a>
+        <a href="AccessPicture_p.png?width=1024&amp;height=576&amp;colorback=FFFFFF&amp;colortext=AAAAAA&amp;colorgrid=333333&amp;colordot=33CC33&amp;colorline=555555"><img id="AccessPicture" src="AccessPicture_p.png?width=1024&amp;height=576&amp;bgcolor=FFFFFF&amp;coronaangle=0" alt="YaCy Access Grid" width="1024" height="576" /></a>
       </p>
     </div>
     
diff --git a/htroot/AccessPicture_p.java b/htroot/AccessPicture_p.java
index 2298a6b1e..282e25faf 100644
--- a/htroot/AccessPicture_p.java
+++ b/htroot/AccessPicture_p.java
@@ -2,7 +2,7 @@
  *  AccessPicture_p
  *  Copyright 2011 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
  *  First released 18.02.2010 at http://yacy.net
- *  
+ *
  *  $LastChangedDate: 2010-06-16 17:11:21 +0200 (Mi, 16 Jun 2010) $
  *  $LastChangedRevision: 6922 $
  *  $LastChangedBy: orbiter $
@@ -11,12 +11,12 @@
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
  *  version 2.1 of the License, or (at your option) any later version.
- *  
+ *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Lesser General Public License for more details.
- *  
+ *
  *  You should have received a copy of the GNU Lesser General Public License
  *  along with this program in the file lgpl21.txt
  *  If not, see <http://www.gnu.org/licenses/>.
@@ -32,7 +32,6 @@ import net.yacy.cora.protocol.RequestHeader;
 import net.yacy.visualization.HexGridPlotter;
 import net.yacy.visualization.PrintTool;
 import net.yacy.visualization.RasterPlotter;
-import net.yacy.visualization.RasterPlotter.DrawMode;
 import de.anomic.search.Switchboard;
 import de.anomic.server.serverObjects;
 import de.anomic.server.serverSwitch;
@@ -40,22 +39,22 @@ import de.anomic.server.serverSwitch;
 public class AccessPicture_p {
 
     private static int[] times = new int[]{60000, 50000, 40000, 30000, 20000, 10000, 1000};
-    
+
     public static RasterPlotter respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
         final Switchboard sb = (Switchboard) env;
-        
+
         String color_text    = "AAAAAA";
         String color_back    = "FFFFFF";
         String color_grid    = "333333";
         String color_dot     = "33CC33";
         String color_line    = "555555";
-        
+
         int width = 1024;
         int height = 576;
         int cellsize = 18;
         boolean corona = false;
         int coronaangle = 0;
-        
+
         if (post != null) {
             width         = post.getInt("width", 1024);
             height        = post.getInt("height", 576);
@@ -69,24 +68,25 @@ public class AccessPicture_p {
             coronaangle   = (corona) ? post.getInt("coronaangle", 0) : -1;
         }
         if (coronaangle < 0) corona = false;
-        
+
         // too small values lead to an error, too big to huge CPU/memory consumption, resulting in possible DOS.
         if (width < 32 ) width = 32;
         if (width > 10000) width = 10000;
         if (height < 24) height = 24;
         if (height > 10000) height = 10000;
-        
-        final HexGridPlotter picture = new HexGridPlotter(width, height, DrawMode.MODE_SUB, color_back, cellsize);
+
+        final RasterPlotter.DrawMode drawMode = (RasterPlotter.darkColor(color_back)) ? RasterPlotter.DrawMode.MODE_ADD : RasterPlotter.DrawMode.MODE_SUB;
+        final HexGridPlotter picture = new HexGridPlotter(width, height, drawMode, color_back, cellsize);
         picture.drawGrid(color_grid);
 
         // calculate dimensions for left and right column
-        int gridLeft = 0;
+        final int gridLeft = 0;
         int gridRight = picture.gridWidth() - 2;
         if ((gridRight & 1) == 0) gridRight--;
 
         // draw home peer
-        int centerx = (picture.gridWidth() >> 1) - 1;
-        int centery = picture.gridHeight() >> 1;
+        final int centerx = (picture.gridWidth() >> 1) - 1;
+        final int centery = picture.gridHeight() >> 1;
         picture.setColor(color_dot);
         picture.gridDot(centerx, centery, 5, true, 100);
         if (corona) {
@@ -99,32 +99,32 @@ public class AccessPicture_p {
         //picture.gridDot(centerx, centery, 31, false);
         picture.setColor(color_text);
         picture.gridPrint(centerx, centery, 5, "THIS YACY PEER", "\"" + sb.peers.myName().toUpperCase() + "\"", 0);
-        
+
         // left column: collect data for access from outside
-        int verticalSlots = (picture.gridHeight() >> 1) - 1;
-        String[] hosts = new String[verticalSlots];
-        int[] time = new int[verticalSlots];
-        int[] count = new int[verticalSlots];
+        final int verticalSlots = (picture.gridHeight() >> 1) - 1;
+        final String[] hosts = new String[verticalSlots];
+        final int[] time = new int[verticalSlots];
+        final int[] count = new int[verticalSlots];
         for (int i = 0; i < verticalSlots; i++) {hosts[i] = null; time[i] = 0; count[i] = 0;}
-        
+
         String host;
         int c, h;
-        for (int j = 0; j < times.length; j++) {
-            Iterator<String> i = sb.accessHosts();
+        for (final int time2 : times) {
+            final Iterator<String> i = sb.accessHosts();
             try {
                 while (i.hasNext()) {
                     host = i.next();
-                    c = sb.latestAccessCount(host, times[j]);
+                    c = sb.latestAccessCount(host, time2);
                     if (c > 0) {
                         h = (Math.abs(host.hashCode())) % hosts.length;
                         hosts[h] = host;
                         count[h] = c;
-                        time[h] = times[j];
+                        time[h] = time2;
                     }
                 }
             } catch (final ConcurrentModificationException e) {} // we don't want to synchronize this
         }
-        
+
         // draw left column: access from outside
         for (int i = 0; i < hosts.length; i++) {
             if (hosts[i] != null) {
@@ -145,7 +145,7 @@ public class AccessPicture_p {
                 }
             }
         }
-        
+
         // right column: collect data for access to outside
         for (int i = 0; i < verticalSlots; i++) {hosts[i] = null; time[i] = 0; count[i] = 0;}
         final Set<ConnectionInfo> allConnections = ConnectionInfo.getAllConnections();
@@ -159,7 +159,7 @@ public class AccessPicture_p {
                 time[h] = (int) conInfo.getLifetime();
             }
         }
-     
+
         // draw right column: access to outside
         for (int i = 0; i < hosts.length; i++) {
             if (hosts[i] != null) {
@@ -180,7 +180,7 @@ public class AccessPicture_p {
                 }
             }
         }
-        
+
         // print headline
         picture.setColor(color_text);
         PrintTool.print(picture, 2, 6, 0, "YACY NODE ACCESS GRID", -1);
@@ -202,8 +202,8 @@ public class AccessPicture_p {
         picture.setColor(color_dot);
         picture.gridLine(centerx + 3, picture.gridHeight() - 1, gridRight, picture.gridHeight() - 1);
         picture.gridPrint(gridRight, picture.gridHeight() - 1, 8, "", "OUTGOING CONNECTIONS", 1);
-        
+
         return picture;
-        
+
     }
 }
diff --git a/htroot/WebStructurePicture_p.java b/htroot/WebStructurePicture_p.java
index b5f9113ac..e1987bad1 100644
--- a/htroot/WebStructurePicture_p.java
+++ b/htroot/WebStructurePicture_p.java
@@ -9,7 +9,7 @@
 // $LastChangedBy$
 //
 // LICENSE
-// 
+//
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation; either version 2 of the License, or
@@ -37,35 +37,36 @@ import net.yacy.cora.protocol.RequestHeader;
 import net.yacy.kelondro.data.meta.DigestURI;
 import net.yacy.kelondro.logging.Log;
 import net.yacy.kelondro.order.Base64Order;
+import net.yacy.visualization.GraphPlotter;
 import net.yacy.visualization.PrintTool;
 import net.yacy.visualization.RasterPlotter;
-import net.yacy.visualization.GraphPlotter;
-
 import de.anomic.search.Switchboard;
 import de.anomic.server.serverObjects;
 import de.anomic.server.serverSwitch;
 import de.anomic.yacy.graphics.WebStructureGraph;
 
 public class WebStructurePicture_p {
-    
+
     private static final double maxlongd = Long.MAX_VALUE;
-    
+
     public static RasterPlotter respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
         final Switchboard sb = (Switchboard) env;
-        
+
         String color_text    = "888888";
         String color_back    = "FFFFFF";
         String color_dot     = "11BB11";
         String color_line    = "222222";
         String color_lineend = "333333";
-        
+
         int width = 1024;
         int height = 576;
         int depth = 3;
         int nodes = 100; // maximum number of host nodes that are painted
         int time = -1;
         String host = null;
-        
+        boolean corona = false;
+        int coronaangle = 0;
+
         if (post != null) {
             width         = post.getInt("width", 1024);
             height        = post.getInt("height", 576);
@@ -78,8 +79,10 @@ public class WebStructurePicture_p {
             color_dot     = post.get("colordot",     color_dot);
             color_line    = post.get("colorline",    color_line);
             color_lineend = post.get("colorlineend", color_lineend);
+            corona        = post.getBoolean("corona", true);
+            coronaangle   = (corona) ? post.getInt("coronaangle", 0) : -1;
         }
-        
+
         // too small values lead to an error, too big to huge CPU/memory consumption, resulting in possible DOS.
         if (width < 32 ) width = 32;
         if (width > 10000) width = 10000;
@@ -87,10 +90,10 @@ public class WebStructurePicture_p {
         if (height > 10000) height = 10000;
         if (depth > 8) depth = 8;
         if (depth < 0) depth = 0;
-        
+
         // calculate target time
         final long timeout = (time < 0) ? Long.MAX_VALUE : System.currentTimeMillis() + (time * 8 / 10);
-        
+
         // find start point
         if ((host == null) || (host.length() == 0) || (host.equals("auto"))) {
             // find domain with most references
@@ -99,7 +102,8 @@ public class WebStructurePicture_p {
         final RasterPlotter graphPicture;
         if (host == null) {
             // probably no information available
-            graphPicture = new RasterPlotter(width, height, RasterPlotter.DrawMode.MODE_SUB, color_back);
+            final RasterPlotter.DrawMode drawMode = (RasterPlotter.darkColor(color_back)) ? RasterPlotter.DrawMode.MODE_ADD : RasterPlotter.DrawMode.MODE_SUB;
+            graphPicture = new RasterPlotter(width, height, drawMode, color_back);
             PrintTool.print(graphPicture, width / 2, height / 2, 0, "NO WEB STRUCTURE DATA AVAILABLE.", 0);
             PrintTool.print(graphPicture, width / 2, height / 2 + 16, 0, "START A WEB CRAWL TO OBTAIN STRUCTURE DATA.", 0);
         } else {
@@ -109,12 +113,12 @@ public class WebStructurePicture_p {
                 hash = ASCII.String((new DigestURI("http://" + host)).hash(), 6, 6);
             } catch (final MalformedURLException e) {Log.logException(e);}
             //assert (sb.webStructure.outgoingReferences(hash) != null);
-            
+
             // recursively find domains, up to a specific depth
             final GraphPlotter graph = new GraphPlotter();
-            if (host != null && hash != null) place(graph, sb.webStructure, hash, host, nodes, timeout, 0.0, 0.0, 0, depth);
+            if (host != null && hash != null) place(graph, sb.webStructure, hash, host, nodes, timeout, 0.0, 0.0, 0, depth, coronaangle);
             //graph.print();
-            
+
             graphPicture = graph.draw(width, height, 40, 40, 16, 16, color_back, color_dot, color_line, color_lineend, color_text);
         }
         // print headline
@@ -124,13 +128,16 @@ public class WebStructurePicture_p {
         PrintTool.print(graphPicture, width - 2, 8, 0, "SNAPSHOT FROM " + new Date().toString().toUpperCase(), 1);
 
         return graphPicture;
-        
+
     }
-    
-    private static final int place(final GraphPlotter graph, final WebStructureGraph structure, final String centerhash, final String centerhost, int maxnodes, final long timeout, final double x, final double y, int nextlayer, final int maxlayer) {
+
+    private static final int place(
+                    final GraphPlotter graph, final WebStructureGraph structure, final String centerhash, final String centerhost,
+                    int maxnodes, final long timeout, final double x, final double y, int nextlayer, final int maxlayer,
+                    final int coronaangle) {
         // returns the number of nodes that had been placed
         assert centerhost != null;
-        GraphPlotter.coordinate center = graph.getPoint(centerhost);
+        final GraphPlotter.coordinate center = graph.getPoint(centerhost);
         int mynodes = 0;
         if (center == null) {
             graph.addPoint(centerhost, x, y, nextlayer);
@@ -140,7 +147,7 @@ public class WebStructurePicture_p {
         if (nextlayer == maxlayer) return mynodes;
         nextlayer++;
         final double radius = 1.0 / (1 << nextlayer);
-        WebStructureGraph.StructureEntry sr = structure.outgoingReferences(centerhash);
+        final WebStructureGraph.StructureEntry sr = structure.outgoingReferences(centerhash);
         final Map<String, Integer> next = (sr == null) ? new HashMap<String, Integer>() : sr.references;
         Map.Entry<String, Integer> entry;
         String targethash, targethost;
@@ -162,7 +169,7 @@ public class WebStructurePicture_p {
             targets.add(new String[] {targethash, targethost});
             if (graph.getPoint(targethost) != null) continue;
             // set a new point. It is placed on a circle around the host point
-            final double angle = Base64Order.enhancedCoder.cardinal((targethash + "____").getBytes()) / maxlongd * 2 * Math.PI;
+            final double angle = ((Base64Order.enhancedCoder.cardinal((targethash + "____").getBytes()) / maxlongd) + (coronaangle / 360.0d)) * 2.0d * Math.PI;
             //System.out.println("ANGLE = " + angle);
             rr = radius * 0.25 * (1 - targetrefs / (double) maxtargetrefs);
             re = radius * 0.5 * (thisrefs / (double) maxthisrefs);
@@ -180,12 +187,12 @@ public class WebStructurePicture_p {
             targethost = target[1];
             final GraphPlotter.coordinate c = graph.getPoint(targethost);
             assert c != null;
-            nextnodes = ((maxnodes <= 0) || (System.currentTimeMillis() >= timeout)) ? 0 : place(graph, structure, targethash, targethost, maxnodes, timeout, c.x, c.y, nextlayer, maxlayer);
+            nextnodes = ((maxnodes <= 0) || (System.currentTimeMillis() >= timeout)) ? 0 : place(graph, structure, targethash, targethost, maxnodes, timeout, c.x, c.y, nextlayer, maxlayer, coronaangle);
             mynodes += nextnodes;
             maxnodes -= nextnodes;
             graph.setBorder(centerhost, targethost);
         }
         return mynodes;
     }
-    
+
 }
diff --git a/source/de/anomic/yacy/graphics/NetworkGraph.java b/source/de/anomic/yacy/graphics/NetworkGraph.java
index 921a84957..653977021 100644
--- a/source/de/anomic/yacy/graphics/NetworkGraph.java
+++ b/source/de/anomic/yacy/graphics/NetworkGraph.java
@@ -39,7 +39,6 @@ import net.yacy.cora.document.UTF8;
 import net.yacy.kelondro.logging.Log;
 import net.yacy.visualization.PrintTool;
 import net.yacy.visualization.RasterPlotter;
-
 import de.anomic.search.QueryParams;
 import de.anomic.search.SearchEvent;
 import de.anomic.search.SearchEventCache;
@@ -73,28 +72,28 @@ public class NetworkGraph {
     private static final String COL_MYPEER_TEXT    = "FFCCCC";
     private static final String COL_DHTOUT         = "440000";
     private static final String COL_DHTIN          = "008800";
-    
+
     private static final String COL_BORDER         = "000000";
     private static final String COL_NORMAL_TEXT    = "000000";
     private static final String COL_LOAD_BG        = "F7F7F7";
-    
+
     public static class CircleThreadPiece {
         private final String pieceName;
         private final Color color;
         private long execTime = 0;
         private float fraction = 0;
-        
+
         public CircleThreadPiece(final String pieceName, final Color color) {
             this.pieceName = pieceName;
             this.color = color;
         }
-        
+
         public int getAngle() { return Math.round(360f*this.fraction); }
         public int getFractionPercent() { return Math.round(100f*this.fraction); }
         public Color getColor() { return this.color; }
         public long getExecTime() { return this.execTime; }
         public String getPieceName() { return this.pieceName; }
-        
+
         public void addExecTime(final long execTime) { this.execTime += execTime; }
         public void reset() {
             this.execTime = 0;
@@ -105,9 +104,9 @@ public class NetworkGraph {
             this.fraction = (float)this.execTime / (float)totalBusyTime;
         }
     }
-    
+
     private static final int     LEGEND_BOX_SIZE = 10;
-    
+
     private static BufferedImage peerloadPicture = null;
     private static long          peerloadPictureDate = 0;
 
@@ -126,7 +125,7 @@ public class NetworkGraph {
         final RasterPlotter eventPicture = getNetworkPicture(seedDB, 120000, 640, 480, 300, 300, 1000, coronaangle, -1, Switchboard.getSwitchboard().getConfig(SwitchboardConstants.NETWORK_NAME, "unspecified"), Switchboard.getSwitchboard().getConfig("network.unit.description", "unspecified"), COL_BACKGROUND);
         //if (eventPicture instanceof ymageMatrix) eventPicture = (ymageMatrix) eventPicture; //new ymageMatrix((ymageMatrix) eventPicture);
         // TODO: fix cloning of ymageMatrix pictures
-        
+
         // get dimensions
         final int cr = Math.min(eventPicture.getWidth(), eventPicture.getHeight()) / 5 - 20;
         final int cx = eventPicture.getWidth() / 2;
@@ -135,32 +134,32 @@ public class NetworkGraph {
         int angle;
 
         // draw in the primary search peers
-        for (int j = 0; j < primarySearches.length; j++) {
-            if (primarySearches[j] == null) continue;
-            eventPicture.setColor((primarySearches[j].isAlive()) ? RasterPlotter.RED : RasterPlotter.GREEN);
-            angle = (int) (360.0 * (((double) FlatWordPartitionScheme.std.dhtPosition(UTF8.getBytes(primarySearches[j].target().hash), null)) / ((double) Long.MAX_VALUE)));
+        for (final yacySearch primarySearche : primarySearches) {
+            if (primarySearche == null) continue;
+            eventPicture.setColor((primarySearche.isAlive()) ? RasterPlotter.RED : RasterPlotter.GREEN);
+            angle = (int) (360.0 * (((double) FlatWordPartitionScheme.std.dhtPosition(UTF8.getBytes(primarySearche.target().hash), null)) / ((double) Long.MAX_VALUE)));
             eventPicture.arcLine(cx, cy, cr - 20, cr, angle, true, null, null, -1, -1, -1, false);
         }
 
         // draw in the secondary search peers
         if (secondarySearches != null) {
-            for (int j = 0; j < secondarySearches.length; j++) {
-                if (secondarySearches[j] == null) continue;
-                eventPicture.setColor((secondarySearches[j].isAlive()) ? RasterPlotter.RED : RasterPlotter.GREEN);
-                angle = (int) (360.0 * (((double) FlatWordPartitionScheme.std.dhtPosition(UTF8.getBytes(secondarySearches[j].target().hash), null)) / ((double) Long.MAX_VALUE)));
+            for (final yacySearch secondarySearche : secondarySearches) {
+                if (secondarySearche == null) continue;
+                eventPicture.setColor((secondarySearche.isAlive()) ? RasterPlotter.RED : RasterPlotter.GREEN);
+                angle = (int) (360.0 * (((double) FlatWordPartitionScheme.std.dhtPosition(UTF8.getBytes(secondarySearche.target().hash), null)) / ((double) Long.MAX_VALUE)));
                 eventPicture.arcLine(cx, cy, cr - 10, cr, angle - 1, true, null, null, -1, -1, -1, false);
                 eventPicture.arcLine(cx, cy, cr - 10, cr, angle + 1, true, null, null, -1, -1, -1, false);
             }
         }
-        
+
         // draw in the search target
         final QueryParams query = event.getQuery();
         final Iterator<byte[]> i = query.queryHashes.iterator();
         eventPicture.setColor(RasterPlotter.GREY);
         while (i.hasNext()) {
-            long[] positions = seedDB.scheme.dhtPositions(i.next());
-            for (int j = 0; j < positions.length; j++) {
-                angle = (int) (360.0 * (((double) positions[j]) / ((double) Long.MAX_VALUE)));
+            final long[] positions = seedDB.scheme.dhtPositions(i.next());
+            for (final long position : positions) {
+                angle = (int) (360.0 * (((double) position) / ((double) Long.MAX_VALUE)));
                 eventPicture.arcLine(cx, cy, cr - 20, cr, angle, true, null, null, -1, -1, -1, false);
             }
         }
@@ -177,14 +176,15 @@ public class NetworkGraph {
             final int passiveLimit, final int potentialLimit,
             final int maxCount, final int coronaangle,
             final long communicationTimeout,
-            final String networkName, final String networkTitle, final String bgcolor) {
+            final String networkName, final String networkTitle, final String color_back) {
 
-        RasterPlotter networkPicture = new RasterPlotter(width, height, (bgcolor.equals("000000")) ? RasterPlotter.DrawMode.MODE_ADD : RasterPlotter.DrawMode.MODE_SUB, bgcolor);
+        final RasterPlotter.DrawMode drawMode = (RasterPlotter.darkColor(color_back)) ? RasterPlotter.DrawMode.MODE_ADD : RasterPlotter.DrawMode.MODE_SUB;
+        final RasterPlotter networkPicture = new RasterPlotter(width, height, drawMode, color_back);
         if (seedDB == null) return networkPicture; // no other peers known
 
         final int maxradius = Math.min(width, height) / 2;
         final int innerradius = maxradius * 4 / 10;
-        int outerradius = maxradius - 20;
+        final int outerradius = maxradius - 20;
 
         // draw network circle
         networkPicture.setColor(COL_DHTCIRCLE);
@@ -253,34 +253,34 @@ public class NetworkGraph {
 
         // draw DHT activity
         if (communicationTimeout >= 0) {
-            Date horizon = new Date(System.currentTimeMillis() - communicationTimeout);
-            for (Hit event: yacyChannel.channels(yacyChannel.DHTRECEIVE)) {
+            final Date horizon = new Date(System.currentTimeMillis() - communicationTimeout);
+            for (final Hit event: yacyChannel.channels(yacyChannel.DHTRECEIVE)) {
                 if (event == null || event.getPubDate() == null) continue;
                 if (event.getPubDate().after(horizon)) {
                     //System.out.println("*** NETWORK-DHTRECEIVE: " + event.getLink());
                     drawNetworkPictureDHT(networkPicture, width / 2, height / 2, innerradius, seedDB.mySeed(), seedDB.get(event.getLink()), COL_DHTIN, coronaangle, false);
                 }
             }
-            for (Hit event: yacyChannel.channels(yacyChannel.DHTSEND)) {
+            for (final Hit event: yacyChannel.channels(yacyChannel.DHTSEND)) {
                 if (event == null || event.getPubDate() == null) continue;
                 if (event.getPubDate().after(horizon)) {
                     //System.out.println("*** NETWORK-DHTSEND: " + event.getLink());
                     drawNetworkPictureDHT(networkPicture, width / 2, height / 2, innerradius, seedDB.mySeed(), seedDB.get(event.getLink()), COL_DHTOUT, coronaangle, true);
                 }
             }
-        }        
-        
+        }
+
         // draw description
         networkPicture.setColor(COL_HEADLINE);
         PrintTool.print(networkPicture, 2, 6, 0, "YACY NETWORK '" + networkName.toUpperCase() + "'", -1);
         PrintTool.print(networkPicture, 2, 14, 0, networkTitle.toUpperCase(), -1);
         PrintTool.print(networkPicture, width - 2, 6, 0, "SNAPSHOT FROM " + new Date().toString().toUpperCase(), 1);
         PrintTool.print(networkPicture, width - 2, 14, 0, "DRAWING OF " + totalCount + " SELECTED PEERS", 1);
-        
+
         return networkPicture;
     }
 
-    private static void drawNetworkPictureDHT(final RasterPlotter img, final int centerX, final int centerY, final int innerradius, final yacySeed mySeed, final yacySeed otherSeed, final String colorLine, final int coronaangle, boolean out) {
+    private static void drawNetworkPictureDHT(final RasterPlotter img, final int centerX, final int centerY, final int innerradius, final yacySeed mySeed, final yacySeed otherSeed, final String colorLine, final int coronaangle, final boolean out) {
         final int angleMy = (int) (360.0 * (((double) FlatWordPartitionScheme.std.dhtPosition(ASCII.getBytes(mySeed.hash), null)) / ((double) Long.MAX_VALUE)));
         final int angleOther = (int) (360.0 * (((double) FlatWordPartitionScheme.std.dhtPosition(ASCII.getBytes(otherSeed.hash), null)) / ((double) Long.MAX_VALUE)));
         // draw line
@@ -291,7 +291,7 @@ public class NetworkGraph {
         img.arcConnect(centerX, centerY, innerradius - 20, angleMy, angleOther, out,
                 colorLine, 100, null, 100, 12, (coronaangle < 0) ? -1 : coronaangle / 30, 2, true);
     }
-    
+
     private static void drawNetworkPicturePeer(
             final RasterPlotter img, final int centerX, final int centerY,
             final int innerradius, final int outerradius,
@@ -317,31 +317,31 @@ public class NetworkGraph {
         PrintTool.arcPrint(img, centerX, centerY, innerradius + linelength, angle, name);
 
         // draw corona around dot for crawling activity
-        int ppmx = seed.getPPM() / 30;
+        final int ppmx = seed.getPPM() / 30;
         if (coronaangle >= 0 && ppmx > 0) {
             drawCorona(img, centerX, centerY, innerradius, angle, dotsize, ppmx, coronaangle, true, false, 24, 24, 24); // color = 0..63
         }
-        
+
         // draw corona around dot for query activity
-        int qphx = ((int) (seed.getQPM() * 4.0));
+        final int qphx = ((int) (seed.getQPM() * 4.0));
         if (coronaangle >= 0 && qphx > 0) {
             drawCorona(img, centerX, centerY, innerradius, angle, dotsize, qphx, coronaangle, false, true, 8, 62, 8); // color = 0..63
         }
     }
-    
-    private static void drawCorona(final RasterPlotter img, final int centerX, final int centerY, final int innerradius, int angle, int dotsize, int strength, int coronaangle, boolean inside, boolean split, int r, int g, int b) {
-        double ca = Math.PI * 2.0 * ((double) coronaangle) / 360.0;
+
+    private static void drawCorona(final RasterPlotter img, final int centerX, final int centerY, final int innerradius, final int angle, final int dotsize, int strength, final int coronaangle, final boolean inside, final boolean split, final int r, final int g, final int b) {
+        final double ca = Math.PI * 2.0 * (coronaangle) / 360.0;
         if (strength > 4) strength = 4;
         // draw a wave around crawling peers
         double wave;
         final int waveradius = innerradius / 2;
-        int segments = 72;
+        final int segments = 72;
         for (int radius = 0; radius < waveradius; radius++) {
-            wave = ((double) (waveradius - radius) * strength) * (1.0 + Math.sin(Math.PI * 16 * radius / waveradius + ((inside) ? ca : -ca))) / 2.0 / (double) waveradius;
+            wave = ((double) (waveradius - radius) * strength) * (1.0 + Math.sin(Math.PI * 16 * radius / waveradius + ((inside) ? ca : -ca))) / 2.0 / waveradius;
             img.setColor(((((long) (r * wave)) & 0xff) << 16) | (((long) ((g * wave)) & 0xff) << 8) | ((((long) (b * wave))) & 0xff));
             if (split) {
                 for (int i = 0; i < segments; i++) {
-                    int a = (coronaangle + 360 * i) / segments;
+                    final int a = (coronaangle + 360 * i) / segments;
                     img.arcArc(centerX, centerY, innerradius, angle, dotsize + radius, dotsize + radius, a, a + 180/segments);
                 }
             } else {
@@ -349,14 +349,14 @@ public class NetworkGraph {
             }
         }
     }
-    
+
     public static BufferedImage getPeerLoadPicture(final long maxAge, final int width, final int height, final CircleThreadPiece[] pieces, final CircleThreadPiece fillRest) {
         if ((peerloadPicture == null) || ((System.currentTimeMillis() - peerloadPictureDate) > maxAge)) {
             drawPeerLoadPicture(width, height, pieces, fillRest);
         }
         return peerloadPicture;
     }
-    
+
     private static void drawPeerLoadPicture(final int width, final int height, final CircleThreadPiece[] pieces, final CircleThreadPiece fillRest) {
     	//prepare image
     	peerloadPicture = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
@@ -364,42 +364,42 @@ public class NetworkGraph {
         g.setBackground(Color.decode("0x"+COL_LOAD_BG));
         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
         g.clearRect(0,0,width,height);
-        
+
         final int circ_w = Math.min(width,height)-20; //width of the circle (r*2)
         final int circ_x = width-circ_w-10;           //x-coordinate of circle-left
         final int circ_y = 10;                        //y-coordinate of circle-top
         int curr_angle = 0;                       //remember current angle
-        
+
         int i;
         for (i=0; i<pieces.length; i++) {
             // draw the piece
             g.setColor(pieces[i].getColor());
             g.fillArc(circ_x, circ_y, circ_w, circ_w, curr_angle, pieces[i].getAngle());
             curr_angle += pieces[i].getAngle();
-            
+
             // draw it's legend line
             drawLegendLine(g, 5, height - 5 - 15 * i, pieces[i].getPieceName()+" ("+pieces[i].getFractionPercent()+" %)", pieces[i].getColor());
         }
-        
+
         // fill the rest
         g.setColor(fillRest.getColor());
         //FIXME: better method to avoid gaps on rounding-differences?
         g.fillArc(circ_x, circ_y, circ_w, circ_w, curr_angle, 360 - curr_angle);
         drawLegendLine(g, 5, height - 5 - 15 * i, fillRest.getPieceName()+" ("+fillRest.getFractionPercent()+" %)", fillRest.getColor());
-        
+
         //draw border around the circle
         g.setColor(Color.decode("0x"+COL_BORDER));
         g.drawArc(circ_x, circ_y, circ_w, circ_w, 0, 360);
-        
+
         peerloadPictureDate = System.currentTimeMillis();
     }
-    
+
     private static void drawLegendLine(final Graphics2D g, final int x, final int y, final String caption, final Color item_color) {
     	g.setColor(item_color);
     	g.fillRect(x, y-LEGEND_BOX_SIZE, LEGEND_BOX_SIZE, LEGEND_BOX_SIZE);
     	g.setColor(Color.decode("0x"+COL_BORDER));
     	g.drawRect(x, y-LEGEND_BOX_SIZE, LEGEND_BOX_SIZE, LEGEND_BOX_SIZE);
-    	
+
     	g.setColor(Color.decode("0x"+COL_NORMAL_TEXT));
     	g.drawChars(caption.toCharArray(), 0, caption.length(), x+LEGEND_BOX_SIZE+5,y);
     }
@@ -409,8 +409,8 @@ public class NetworkGraph {
             drawBannerPicture(width, height, bgcolor, textcolor, bordercolor, name, links, words, type, ppm, network, peers, nlinks, nwords, nqph, nppm, logo);
         }
         return bannerPicture;
-    }    
-    
+    }
+
     public static RasterPlotter getBannerPicture(final long maxAge, final int width, final int height, final String bgcolor, final String textcolor, final String bordercolor, final String name, final long links, final long words, final String type, final int ppm, final String network, final int peers, final long nlinks, final long nwords, final double nqph, final long nppm, final BufferedImage newLogo) {
         if ((bannerPicture == null) || ((System.currentTimeMillis() - bannerPictureDate) > maxAge)) {
             drawBannerPicture(width, height, bgcolor, textcolor, bordercolor, name, links, words, type, ppm, network, peers, nlinks, nwords, nqph, nppm, newLogo);
@@ -451,11 +451,11 @@ public class NetworkGraph {
             bannerPicture.line(width-1, 0, width-1, height-1, 100);
             bannerPicture.line(0, height-1, width-1, height-1, 100);
         }
-        
+
         // set timestamp
          bannerPictureDate = System.currentTimeMillis();
     }
-    
+
     public static boolean logoIsLoaded() {
         if (logo == null) {
             return false;
diff --git a/source/net/yacy/screenshot.java b/source/net/yacy/screenshot.java
deleted file mode 100755
index 4f335faad..000000000
--- a/source/net/yacy/screenshot.java
+++ /dev/null
@@ -1,39 +0,0 @@
-package net.yacy;
-
-import java.awt.Dimension;
-import java.awt.Rectangle;
-import java.awt.Robot;
-import java.awt.Toolkit;
-import java.awt.image.BufferedImage;
-import java.io.File;
-
-import javax.imageio.ImageIO;
-
-
-public class screenshot {
-    /*
-    try {
-        Robot robot = new Robot();
-    
-        Rectangle area = new Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
-        BufferedImage bufferedImage = robot.createScreenCapture(area);
-    
-    } catch (AWTException e) {
-    }
-    */
-    public static void main(final String[] args) throws Exception {
-        
-        final Toolkit toolkit = Toolkit.getDefaultToolkit();
-        final Dimension screenSize = toolkit.getScreenSize();
-        final Rectangle screenRect = new Rectangle(screenSize);
-        // create screen shot
-        final Robot robot = new Robot();
-        final BufferedImage image = robot.createScreenCapture(screenRect);
-        final String outFileName = "test.png";
-        // save captured image to PNG file
-        ImageIO.write(image, "png", new File(outFileName));
-        // give feedback
-        System.out.println("Saved screen shot (" + image.getWidth() + " x " + image.getHeight() + " pixels) to file \"" + outFileName + "\".");
-
-    }
-}
diff --git a/source/net/yacy/visualization/GraphPlotter.java b/source/net/yacy/visualization/GraphPlotter.java
index 0287d6250..e37f8f1e9 100644
--- a/source/net/yacy/visualization/GraphPlotter.java
+++ b/source/net/yacy/visualization/GraphPlotter.java
@@ -9,7 +9,7 @@
 // $LastChangedBy$
 //
 // LICENSE
-// 
+//
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation; either version 2 of the License, or
@@ -44,24 +44,24 @@ public class GraphPlotter {
 
     // a ymageGraph is a set of points and borders between the points
     // to reference the points, they must all have a nickname
-    
-    private Map<String, coordinate> points;
-    private Set<String> borders;
+
+    private final Map<String, coordinate> points;
+    private final Set<String> borders;
     private double leftmost, rightmost, topmost, bottommost;
-    
+
     public GraphPlotter() {
-        points = new HashMap<String, coordinate>();
-        borders = new HashSet<String>();
-        leftmost = 1.0;
-        rightmost = -1.0;
-        topmost = -1.0;
-        bottommost = 1.0;
+        this.points = new HashMap<String, coordinate>();
+        this.borders = new HashSet<String>();
+        this.leftmost = 1.0;
+        this.rightmost = -1.0;
+        this.topmost = -1.0;
+        this.bottommost = 1.0;
     }
-    
+
     public coordinate getPoint(final String name) {
-        return points.get(name);
+        return this.points.get(name);
     }
-    
+
     public coordinate[] getBorder(final String name) {
         final int p = name.indexOf("$");
         if (p < 0) return null;
@@ -70,28 +70,28 @@ public class GraphPlotter {
         if ((from == null) || (to == null)) return null;
         return new coordinate[] {from, to};
     }
-    
+
     public coordinate addPoint(final String name, final double x, final double y, final int layer) {
         final coordinate newc = new coordinate(x, y, layer);
-        final coordinate oldc = points.put(name, newc);
+        final coordinate oldc = this.points.put(name, newc);
         assert oldc == null; // all add shall be unique
-        if (x > rightmost) rightmost = x;
-        if (x < leftmost) leftmost = x;
-        if (y > topmost) topmost = y;
-        if (y < bottommost) bottommost = y;
+        if (x > this.rightmost) this.rightmost = x;
+        if (x < this.leftmost) this.leftmost = x;
+        if (y > this.topmost) this.topmost = y;
+        if (y < this.bottommost) this.bottommost = y;
         return newc;
     }
-    
+
     public boolean hasBorder(final String fromPoint, final String toPoint) {
-        return borders.contains(fromPoint + "-" + toPoint);
+        return this.borders.contains(fromPoint + "-" + toPoint);
     }
-    
+
     public void setBorder(final String fromPoint, final String toPoint) {
-        final coordinate from = points.get(fromPoint);
-        final coordinate to = points.get(toPoint);
+        final coordinate from = this.points.get(fromPoint);
+        final coordinate to = this.points.get(toPoint);
         assert from != null;
         assert to != null;
-        borders.add(fromPoint + "$" + toPoint);
+        this.borders.add(fromPoint + "$" + toPoint);
     }
 
     public static class coordinate {
@@ -107,10 +107,10 @@ public class GraphPlotter {
             this.layer = layer;
         }
     }
-    
+
     public void print() {
         // for debug purpose: print out all coordinates
-        final Iterator<Map.Entry<String, coordinate>> i = points.entrySet().iterator();
+        final Iterator<Map.Entry<String, coordinate>> i = this.points.entrySet().iterator();
         Map.Entry<String, coordinate> entry;
         String name;
         coordinate c;
@@ -120,12 +120,12 @@ public class GraphPlotter {
             c = entry.getValue();
             System.out.println("point(" + c.x + ", " + c.y + ", " + c.layer + ") [" + name + "]");
         }
-        final Iterator<String> j = borders.iterator();
+        final Iterator<String> j = this.borders.iterator();
         while (j.hasNext()) {
             System.out.println("border(" + j.next() + ")");
         }
     }
-    
+
     public RasterPlotter draw(
             final int width,
             final int height,
@@ -139,15 +139,14 @@ public class GraphPlotter {
             final String color_lineend,
             final String color_text
             ) {
-        RasterPlotter.DrawMode drawMode = RasterPlotter.DrawMode.MODE_SUB;
-        if (RasterPlotter.darkColor(color_back)) drawMode = RasterPlotter.DrawMode.MODE_ADD;
-        
+        final RasterPlotter.DrawMode drawMode = (RasterPlotter.darkColor(color_back)) ? RasterPlotter.DrawMode.MODE_ADD : RasterPlotter.DrawMode.MODE_SUB;
+
         final RasterPlotter image = new RasterPlotter(width, height, drawMode, color_back);
-        final double xfactor = ((rightmost - leftmost) == 0.0) ? 0.0 : (width - leftborder - rightborder) / (rightmost - leftmost);
-        final double yfactor = ((topmost - bottommost) == 0.0) ? 0.0 : (height - topborder - bottomborder) / (topmost - bottommost);
-        
+        final double xfactor = ((this.rightmost - this.leftmost) == 0.0) ? 0.0 : (width - leftborder - rightborder) / (this.rightmost - this.leftmost);
+        final double yfactor = ((this.topmost - this.bottommost) == 0.0) ? 0.0 : (height - topborder - bottomborder) / (this.topmost - this.bottommost);
+
         // draw dots and names
-        final Iterator<Map.Entry<String, coordinate>> i = points.entrySet().iterator();
+        final Iterator<Map.Entry<String, coordinate>> i = this.points.entrySet().iterator();
         Map.Entry<String, coordinate> entry;
         String name;
         coordinate c;
@@ -156,8 +155,8 @@ public class GraphPlotter {
             entry = i.next();
             name = entry.getKey();
             c = entry.getValue();
-            x = (xfactor == 0.0) ? width / 2 : (int) (leftborder + (c.x - leftmost) * xfactor);
-            y = (yfactor == 0.0) ? height / 2 : (int) (height - bottomborder - (c.y - bottommost) * yfactor);
+            x = (xfactor == 0.0) ? width / 2 : (int) (leftborder + (c.x - this.leftmost) * xfactor);
+            y = (yfactor == 0.0) ? height / 2 : (int) (height - bottomborder - (c.y - this.bottommost) * yfactor);
             image.setColor(color_dot);
             image.dot(x, y, 6, true, 100);
             image.setColor(color_text);
@@ -165,7 +164,7 @@ public class GraphPlotter {
         }
 
         // draw lines
-        final Iterator<String> j = borders.iterator();
+        final Iterator<String> j = this.borders.iterator();
         coordinate[] border;
         image.setColor(color_line);
         int x0, x1, y0, y1;
@@ -176,20 +175,20 @@ public class GraphPlotter {
                 x0 = width / 2;
                 x1 = width / 2;
             } else {
-                x0 = (int) (leftborder + (border[0].x - leftmost) * xfactor);
-                x1 = (int) (leftborder + (border[1].x - leftmost) * xfactor);
+                x0 = (int) (leftborder + (border[0].x - this.leftmost) * xfactor);
+                x1 = (int) (leftborder + (border[1].x - this.leftmost) * xfactor);
             }
             if (yfactor == 0.0) {
                 y0 = height / 2;
                 y1 = height / 2;
             } else {
-                y0 = (int) (height - bottomborder - (border[0].y - bottommost) * yfactor);
-                y1 = (int) (height - bottomborder - (border[1].y - bottommost) * yfactor);
+                y0 = (int) (height - bottomborder - (border[0].y - this.bottommost) * yfactor);
+                y1 = (int) (height - bottomborder - (border[1].y - this.bottommost) * yfactor);
             }
             // draw the line, with the dot at the beginning of the line
             image.lineDot(x1, y1, x0, y0, 3, 4, color_line, color_lineend);
         }
         return image;
     }
-    
+
 }