/// <summary>
/// This function deletes the selected gate along with all of its connection from the circuit
/// It deletes all connection of that gate first before finally deleting the gate itself
/// </summary>
/// <param name="gate">The gate to be deleted</param>
/// <returns>True if the gate is deleted</returns>
public bool deleteGate(Gate gate)
{
setUndoList();
this.redoList.Clear();
List <Connection> temp = gate.getListOfConnections();
int count = temp.Count();
for (int i = 0; i < count; i++)
{
if (temp[i] != null)
{
if (temp[i].isFirstGate(gate))
{
Gate temp2 = temp[i].getSecondGate();
Connection Cx = temp[i];
do
{
Cx = temp2.inputConnectionInvalid(Cx);
if (Cx != null)
{
temp2 = Cx.getSecondGate();
}
else
{
temp2.calcValue();
}
}while (Cx != null);
}
deleteConnection(temp[i]);
}
}
gateList.Remove(gate);
return(true);
}
/// <summary>
/// this function draw the connection and determine its color (value)
/// </summary>
/// <param name="pic">The pictureBox where the connection will be drawn</param>
public void drawConnection(ref PictureBox pic)
{
int col1 = first.getColumn();
int row1 = first.getRow();
int col2 = second.getColumn();
int row2 = second.getRow();
Pen P;
if (getValue() == 0)
{
P = new Pen(Color.Blue, 3);
}
else if (getValue() == 1)
{
P = new Pen(Color.Green, 3);
}
else
{
P = new Pen(Color.Red, 3);
}
Graphics g = pic.CreateGraphics();
Point p1 = new Point((col1 - 1) * 50 + 50, (row1 - 1) * 50 + 25);
Point p2 = new Point(0, 0);
//the following code define where the line end
if (second is NotGate || second is SinkGate)
{
p2 = new Point((col2 - 1) * 50, (row2 - 1) * 50 + 25);
}
else
{
List <Connection> temp = second.getListOfConnections();
if (temp.Count() == 1 || (temp.Count() > 1 && temp[0] != null && temp[1] == null) || (temp.Count() > 1 && temp[0] != null && temp[1] != null && this.Equals(temp[0])))
{
p2 = new Point((col2 - 1) * 50, (row2 - 1) * 50);
}
else if ((temp.Count() > 1 && temp[0] != null && temp[1] != null) || (temp.Count() > 1 && temp[1].Equals(this)))
{
p2 = new Point((col2 - 1) * 50, (row2 - 1) * 50 + 50);
}
}
g.DrawLine(P, p1, p2);
}