static void Main()
{
// this will creates the originator canvas and the other lists neccessary to run the application
Originator canvas = new Originator();
// This will add shapes to the array list
ArrayList mem = new ArrayList();
Memento m = new Memento(mem);
List <Memento> holder = new List <Memento>();
//this random number generator
Random rnd = new Random();
//This will prompt for user to use application adn help the user
Console.WriteLine("Welcome to the canvas!");
Console.WriteLine("Please enter a command: (H for Help)" + Environment.NewLine);
while (true)
{
//gets the size of the current canvas for referencing
int x = canvas.Count();
string sc = Console.ReadLine();
//closing sequence for the application if the user chooses too.
if (sc.Equals("q") || sc.Equals("Q"))
{
Console.WriteLine("Closing application....");
System.Threading.Thread.Sleep(2000);
Console.WriteLine("Succusfully closed application");
break;
}
else
{
switch (sc)
{
//If user chooses this command it will show this drop down menu
case "H":
Console.WriteLine("Commands: ");
Console.WriteLine(" A <shape> Add <shape> to canvas");
Console.WriteLine(" U Undo last operation");
Console.WriteLine(" R Redo last operation");
Console.WriteLine(" D Display Canvas");
Console.WriteLine(" S Save canvas to SVG file");
Console.WriteLine(" C Clear canvas");
Console.WriteLine(" Q Close application");
break;
//all these cases will add whatever shape the user chooses onto the canvas
case "A Rectangle":
Rectangle rect = new Rectangle(rnd.Next(1, 500), rnd.Next(1, 500), rnd.Next(1, 500), rnd.Next(1, 500));
string Rect = rect.ToString();
canvas.Add(Rect);
m = canvas.SaveMemento();
break;
case "A Circle":
Circle circle = new Circle();
string Circle = circle.ToString();
canvas.Add(Circle);
m = canvas.SaveMemento();
break;
case "A Ellipse":
Ellipse ellipse = new Ellipse(rnd.Next(1, 500), rnd.Next(1, 500), rnd.Next(1, 500), rnd.Next(1, 500));
string Ellipse = ellipse.ToString();
canvas.Add(Ellipse);
m = canvas.SaveMemento();
break;
case "A Line":
Line line = new Line(rnd.Next(1, 500), rnd.Next(1, 500), rnd.Next(1, 500), rnd.Next(1, 500));
string Line = line.ToString();
canvas.Add(Line);
m = canvas.SaveMemento();
break;
case "A Polyline":
Polyline polyline = new Polyline();
string Polyline = polyline.ToString();
canvas.Add(Polyline);
m = canvas.SaveMemento();
break;
case "A Polygon":
Polygon polygon = new Polygon();
string Polygon = polygon.ToString();
canvas.Add(Polygon);
m = canvas.SaveMemento();
break;
case "A Path":
Path path = new Path();
string Path = path.ToString();
canvas.Add(Path);
m = canvas.SaveMemento();
break;
case "U":
// if statement to check if the canvas is not empty if it is not then it will do the undo operation
if (x == 0)
{
Console.WriteLine("Canvas is empty! No undo is possible.");
}
else if (x > 0)
{
m = canvas.SaveMemento();
canvas.RemoveAt();
}
break;
case "R":
//this will restore the canvas if an undo is completed
canvas.SaveMemento();
canvas.RestoreMemento(m);
break;
case "C":
//if statment to check if the canvas is empty. If it is it will not perform the clear operation as there is nothing to clear.
if (x == 0)
{
Console.WriteLine("Canvas is empty! Nothing to clear.");
}
//if it isnt empty then obviously clear the canvas
else if (x > 0)
{
canvas = new Originator();
Console.WriteLine("Successfully cleared canvas.");
}
break;
//This will also check if the canvas is empty and if it is it will inform the user there is nothing to display
case "D":
if (x == 0)
{
Console.WriteLine("Canvas is empty! Nothing to display.");
}
else if (x > 0)
{
canvas.getShapes();
}
break;
case "S":
String PathToSVG = @"./Shapes.svg";
List <string> Shapes = canvas.ListShapes();
//https://docs.microsoft.com/en-us/dotnet/api/system.io.file.create?view=net-5.0
using (FileStream fs = File.Create(PathToSVG))
{
// insert open svg tag into first line
byte[] info = new UTF8Encoding(true).GetBytes(@"<svg height=""2000"" width=""2000"" xmlns=""http://www.w3.org/2000/svg"">" + Environment.NewLine);
// Add some information to the file.
fs.Write(info, 0, info.Length);
}
//add close tag to the end
using (StreamWriter sw = File.AppendText(PathToSVG))
{
foreach (string item in Shapes)
{
sw.WriteLine(item);
}
sw.WriteLine("</svg>");
}
Console.WriteLine("Successfully saved your canvas!");
break;
default:
//informs the user his/her input is invalid
Console.WriteLine("Invalid Input");
break;
}
}
}
}