Output SPICE node names in the "Nxxx" format

join all nodes connected to GND together

diylc/diylc-library/src/org/diylc/components/misc/GroundSymbol.java

@@ -139,6 +139,11 @@ public class GroundSymbol extends AbstractComponent<Void> {
   @Override
   public String getControlPointNodeName(int index) {
     return getName();
+  }
+  
+  @Override
+  public String getCommonPointName(int pointIndex) {  
+    return "GND";
   }
 
   @Override

diylc/diylc-library/src/org/diylc/netlist/SpiceAnalyzer.java

@@ -113,7 +113,7 @@ public class SpiceAnalyzer extends NetlistAnalyzer implements INetlistAnalyzer {
       
       // output to spice
       for (int i = 0; i < c.getControlPointCount(); i++) {
-        sb.append(fill(Integer.toString(nodeIndices[i]), 5));
+        sb.append(fill(formatSpiceNode(nodeIndices[i]), 5));
         sb.append(" ");
       }
       
@@ -130,6 +130,10 @@ public class SpiceAnalyzer extends NetlistAnalyzer implements INetlistAnalyzer {
     return new Summary(netlist, sb.toString());
   }
   
+  private static String formatSpiceNode(int i) {
+    return String.format("N%03d" , i);
+  }
+  
   private String fill(String source, int desiredLength) {
     String res = source;
     for (int i = 0; i < desiredLength - source.length(); i++)