/// <summary>
/// Undo a previously marked drawing
/// Takes a boolean argument that detemines if the element is to be deleted
/// from concerned arrayList
/// </summary>
/// <param name="deleteItem"></param>
/// <returns></returns>
private Boolean undoDrawing(Boolean deleteItem)
{
//Undo option
//There is a stack called actionState that stores all the actions
//actions here are elements that are identified - capacitors, etc
// and the circle is drawn around them
//When an option is undo-ed the stack pops and the element is examined
//That element has info on coordinates
//erase graphics method is called
ArrayList foo = new ArrayList();
if (actionState.Count > 0)
{
foo = actionState.Pop();
string sfoo = null;
char[] delims = { '_' };
string[] foob = null;
if (foo.Equals(Transistors))
{
sfoo = Transistors[Transistors.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if(deleteItem) Transistors.RemoveAt(Transistors.Count - 1);
//MessageBox.Show("It was transistors");
}
else if (foo.Equals(Resistors))
{
sfoo = Resistors[Resistors.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Resistors.RemoveAt(Resistors.Count - 1);
}
else if (foo.Equals(Capacitors))
{
sfoo = Capacitors[Capacitors.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Capacitors.RemoveAt(Capacitors.Count - 1);
}
else if (foo.Equals(Inductors))
{
sfoo = Inductors[Inductors.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Inductors.RemoveAt(Inductors.Count - 1);
}
else if (foo.Equals(CS))
{
sfoo = CS[CS.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) CS.RemoveAt(CS.Count - 1);
}
else if (foo.Equals(VS))
{
sfoo = VS[VS.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) VS.RemoveAt(VS.Count - 1);
}
else if (foo.Equals(Diodes))
{
sfoo = Diodes[Diodes.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Diodes.RemoveAt(Diodes.Count - 1);
}
else if (foo.Equals(Nodes))
{
sfoo = Nodes[Nodes.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Nodes.RemoveAt(Nodes.Count - 1);
}
else if (foo.Equals(Amplifier))
{
sfoo = Amplifier[Amplifier.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Amplifier.RemoveAt(Amplifier.Count - 1);
}
else if (foo.Equals(Attenuator))
{
sfoo = Attenuator[Attenuator.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Attenuator.RemoveAt(Attenuator.Count - 1);
}
else if (foo.Equals(Bias))
{
sfoo = Bias[Bias.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Bias.RemoveAt(Bias.Count - 1);
}
else if (foo.Equals(PDet))
{
sfoo = PDet[PDet.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) PDet.RemoveAt(PDet.Count - 1);
}
else if (foo.Equals(Switch))
{
sfoo = Switch[Switch.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Switch.RemoveAt(Switch.Count - 1);
}
else if (foo.Equals(Other_c))
{
sfoo = Other_c[Other_c.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Other_c.RemoveAt(Other_c.Count - 1);
}
else if (foo.Equals(ANDgate))
{
sfoo = ANDgate[ANDgate.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) ANDgate.RemoveAt(ANDgate.Count - 1);
}
else if (foo.Equals(Tgate))
{
sfoo = Tgate[Tgate.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Tgate.RemoveAt(Tgate.Count - 1);
}
else if (foo.Equals(ORgate))
{
sfoo = ORgate[ORgate.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) ORgate.RemoveAt(ORgate.Count - 1);
}
else if (foo.Equals(NORgate))
{
sfoo = NORgate[NORgate.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) NORgate.RemoveAt(NORgate.Count - 1);
}
else if (foo.Equals(Other_bb))
{
sfoo = Other_bb[Other_bb.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Other_bb.RemoveAt(Other_bb.Count - 1);
}
else if (foo.Equals(Buffer))
{
sfoo = Buffer[Buffer.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Buffer.RemoveAt(Buffer.Count - 1);
}
else if (foo.Equals(Supply))
{
sfoo = Supply[Supply.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Supply.RemoveAt(Supply.Count - 1);
}
else if (foo.Equals(Ground))
{
sfoo = Ground[Ground.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) Ground.RemoveAt(Ground.Count - 1);
}
else if (foo.Equals(newC))
{
sfoo = newC[newC.Count - 1].ToString();
foob = sfoo.Split(delims, StringSplitOptions.RemoveEmptyEntries);
eraseGraphics(int.Parse(foob[1]), int.Parse(foob[2]));
if (deleteItem) newC.RemoveAt(newC.Count - 1);
}
}
else
{
//writeLog("Nothing to UNDO");
return false;
}
return true;
}