Add simple check for ground (issue #18)

qucs/extsimkernels/abstractspicekernel.cpp

@@ -120,6 +120,22 @@ bool AbstractSpiceKernel::checkSchematic(QStringList &incompat)
     return incompat.isEmpty();
 }
 
+/*!
+ * \brief AbstractSpiceKernel::checkGround Check if schematic contain at least one ground.
+ * \return True if ground found, false otherwise
+ */
+bool AbstractSpiceKernel::checkGround()
+{
+    bool r = false;
+    for(Component *pc = Sch->DocComps.first(); pc != 0; pc = Sch->DocComps.next()) {
+        if (pc->Model=="GND") {
+            r = true;
+            break;
+        }
+    }
+    return r;
+}
+
 /*!
  * \brief AbstractSpiceKernel::startNetlist Outputs .PARAM , .GLOABAL_PARAM,
  *        and .OPTIONS sections to netlist. These sections are placed on schematic

qucs/extsimkernels/abstractspicekernel.h

@@ -62,6 +62,7 @@ protected:
     virtual void createNetlist(QTextStream& stream, int NumPorts,QStringList& simulations,
                                QStringList& vars, QStringList &outputs);
     void removeAllSimulatorOutputs();
+    bool checkGround();
 
 public:
 

qucs/extsimkernels/ngspice.cpp

@@ -383,6 +383,13 @@ void Ngspice::slotSimulate()
         return;
     }
 
+    if (!checkGround()) {
+        output.append("No Ground found. Please add at least one ground!\n");
+        emit finished();
+        emit errors(QProcess::FailedToStart);
+        return;
+    }
+
     if (!checkNodeNames(incompat)) {
         QString s = incompat.join("; ");
         output.append("There were Nutmeg-incompatible node names. Simulator cannot proceed.\n");

qucs/extsimkernels/xyce.cpp

@@ -242,6 +242,13 @@ void Xyce::slotSimulate()
         return;
     }
 
+    if (!checkGround()) {
+        output.append("No Ground found. Please add at least one ground!\n");
+        emit finished();
+        emit errors(QProcess::FailedToStart);
+        return;
+    }
+
     int num=0;
     netlistQueue.clear();
     output_files.clear();