/*--------------- D i s p l a y P w l F c n ( ) ---------------
PURPOSE
Display a pwlFcn from beginning to end.
INPUT PARAMETERS
pwlFcn -- the pwlFcn to be displayed.
*/
void DisplayPwlFcn(DblLinkedList &pwlFcn)
{
double x;
double y;
//Check if empty
if(pwlFcn.Empty())
{
cout<<"The pwlFcn is empty."<<endl;
return;
}
//Start at the beginning and print everything
pwlFcn.Rewind();
cout<<"PIECEWISE LINEAR FUNCTION DEFINITION"<<endl;
while(!pwlFcn.AtEnd())
{
x = pwlFcn.CurrentItem().X();
y = pwlFcn.CurrentItem().Y();
cout<<"("<<x<<","<<y<<")"<<endl;
pwlFcn.Forward();
}
//Reset to beginning
pwlFcn.Rewind();
}
/*--------------- G e n e r a t e ( ) ---------------
PURPOSE
Generate the periodic function.
INPUT PARAMETERS
cmdLine -- the execute command command line.
pwlFcn -- the pwlFcn list.
*/
void Generate(string cmdLine, DblLinkedList &pwlFcn)
{
// Make sure the function is defined.
if (pwlFcn.Empty())
{
cout << "The pwlFcn is empty." << endl;
return;
}
Point testPoint; // The point to test
const unsigned MinCmdSize = 2; // To check for an empty test command
istringstream cmdStream(cmdLine.erase(0,1)); // Command stream
// Ignore if empty test parameters.
if (cmdLine.length() < MinCmdSize)
return;
// Display the current entry.
cout << "\nCURRENT ENTRY\n" << pwlFcn.CurrentItem() << endl << endl;
// Read the start and stop times and the number of points.
double tStart;
double tEnd;
unsigned numPts;
cmdStream >> tStart >> tEnd >> numPts;
double dt = (tEnd - tStart) / (numPts - 1);
// Generate the waveform starting at t = 0.
double t = tStart;
pwlFcn.Rewind();
for (unsigned i=0; i<numPts; i++)
{
Point pt = Point(t, Interpolate(pwlFcn, t));
cout << pt << endl;
t += dt;
}
pwlFcn.Rewind();
}
/*--------------- E x e c u t e ( ) ---------------
PURPOSE
Execute a command stream, either from cin of
from a command file
INPUT PARAMETERS
cmdStream -- the stream from which commands are to be read
pwlFcn -- the pwlFcn list.
*/
void Execute(istream &cmdStream, DblLinkedList &pwlFcn)
{
string cmdLine; // The current command line
// Repeatedly get a command from the keyboard and
// execute it.
do
{
cmdLine = GetCmd(cmdStream, pwlFcn);
if (cmdLine.length() != 0)
{
switch (toupper(cmdLine[0]))
{
// Execute a command file.
case ExecuteCmd:
DoExecute(cmdLine, pwlFcn);
break;
// Determine which command to execute.
case InsertCmd: // Insert a new point.
InsertPoint(cmdLine, pwlFcn);
break;
case ClearCmd: // Clear the pwlFcn.
pwlFcn.~DblLinkedList(); // Explicit destructor function call
break;
case DeleteCmd: // Delete the current point.
if (!pwlFcn.AtEnd())
pwlFcn.DeleteItem();
if (pwlFcn.Empty())
cout << "The pwlFcn is empty." << endl;
break;
case PrintCmd: // Display the pwlFcn.
DisplayPwlFcn(pwlFcn);
break;
case OpenCmd: // Read in a pwlFcn file.
ReadPwlFcnFile(cmdLine, pwlFcn);
break;
case SaveAsCmd: // Write out a pwlFcn file.
WritePwlFcnFile(cmdLine, pwlFcn);
break;
case ForwardCmd: // Advance to the next point.
if (!pwlFcn.AtEnd())
pwlFcn.Forward();
if (pwlFcn.AtEnd())
cout << "The pwlFcn is at the end." << endl;
break;
case BackwardCmd: // Go back to the previous point.
pwlFcn.Backward();
break;
case RewindCmd: // Rewind to the first point in the pwlFcn.
pwlFcn.Rewind();
break;
case GenerateCmd: // Generate waveform.
{
DblLinkedList pwlFcnCopy(pwlFcn); // Invokes copy constructor
Generate(cmdLine, pwlFcnCopy);
}
break;
case NumPtsCmd:
{
DblLinkedList pwlFcnCopy; // A copy of the pwlFcn
pwlFcnCopy = pwlFcn; // Invokes overloaded assignment
CountPoints(pwlFcnCopy); // Pass by value invokes the copy constructor.
}
break;
case QuitCmd: // Terminate execution.
break;
default: // Bad command
cout << "*** Error: Unknown Command" << endl;
break;
}
}
}
while (cmdLine.length() > 0 && toupper(cmdLine[0]) != QuitCmd);
}
