private static void FillCell(Cell cell, ConsoleColor color)
{
Console.SetCursorPosition(cell.X, cell.Y);
Console.BackgroundColor = color;
Console.Write(' ');
Console.SetCursorPosition(cell.X, cell.Y);
Console.BackgroundColor = ConsoleColor.Black;
}
public void Sketch()
{
Stack<Cell> path = new Stack<Cell>();
Cell currentPosition;
ConsoleKeyInfo key; // Added in C# 2.0
Console.WriteLine("Use arrow keys to draw. X to exit.");
for(int i = 2; i < Console.WindowHeight; i++)
{
Console.WriteLine();
}
currentPosition = new Cell(Console.WindowWidth / 2, Console.WindowHeight / 2);
path.Push(currentPosition);
FillCell(currentPosition);
do
{
// Etch in the direction indicated by the
// arrow keys that the user enters.
key = Move();
switch(key.Key)
{
case ConsoleKey.Z:
// Undo the previous Move.
if(path.Count >= 1)
{
// No cast required
currentPosition = path.Pop();
Console.SetCursorPosition(
currentPosition.X, currentPosition.Y);
FillCell(currentPosition, ConsoleColor.Black);
Undo();
}
break;
case ConsoleKey.DownArrow:
if(Console.CursorTop < Console.WindowHeight - 2)
{
currentPosition = new Cell(
Console.CursorLeft, Console.CursorTop + 1);
}
// Only type Cell allowed in call to Push().
path.Push(currentPosition);
FillCell(currentPosition);
break;
case ConsoleKey.UpArrow:
if(Console.CursorTop > 1)
{
currentPosition = new Cell(
Console.CursorLeft, Console.CursorTop - 1);
}
// Only type Cell allowed in call to Push().
path.Push(currentPosition);
FillCell(currentPosition);
break;
case ConsoleKey.LeftArrow:
if(Console.CursorLeft > 1)
{
currentPosition = new Cell(
Console.CursorLeft - 1, Console.CursorTop);
}
// Only type Cell allowed in call to Push().
path.Push(currentPosition);
FillCell(currentPosition);
break;
case ConsoleKey.RightArrow:
// SaveState()
if(Console.CursorLeft < Console.WindowWidth - 2)
{
currentPosition = new Cell(
Console.CursorLeft + 1, Console.CursorTop);
}
// Only type Cell allowed in call to Push().
path.Push(currentPosition);
FillCell(currentPosition);
break;
default:
Console.Beep(); // Added in C# 2.0
break;
}
}
while(key.Key != ConsoleKey.X); // Use X to quit.
}
private static void FillCell(Cell cell)
{
FillCell(cell, ConsoleColor.White);
}