Implement Change Detection Drawing

CoopSweeper/ArrayHelpers.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace CoopSweeper
+{
+    public static class ArrayHelpers
+    {
+        public static T[,] Clone2D<T>(T[,] data) where T : ICloneable<T>
+        {
+            if (data == null)
+                return null;
+            var newArray = new T[data.GetLength(0), data.GetLength(1)];
+            for (var x = 0;  x< data.GetLength(0); x++)
+                for (var y = 0; y < data.GetLength(1); y++)
+                    newArray[x,y] = data[x,y].Clone();
+            return newArray;
+        }
+    }
+}

CoopSweeper/GameTypes/Field.cs

@@ -21,20 +21,34 @@ namespace CoopSweeper.GameTypes
 
         public int CheckID { get; set; }
 
-        public DisplayState GetDisplayState()
+        public DisplayState DisplayState
         {
-            switch(State)
+            get
             {
-                case FieldState.QUESTIONMARK:
+                switch (State)
-                case FieldState.NONE:
+                {
-                case FieldState.FLAG: 
+                    case FieldState.QUESTIONMARK:
+                    case FieldState.NONE:
+                    case FieldState.FLAG:
                         return (DisplayState)State;
-                case FieldState.REVEALED: 
+                    case FieldState.REVEALED:
-                    if(ContainsBomb)
+                        if (ContainsBomb)
-                        return DisplayState.BOMB;
+                            return DisplayState.BOMB;
-                    return (DisplayState)SurroundingBombs;
+                        return (DisplayState)SurroundingBombs;
+                }
+                return DisplayState.ERROR;
             }
-            return DisplayState.ERROR;
+        }
+
+        public IField Clone()
+        {
+            return new Field()
+            {
+                State = State,
+                ContainsBomb = ContainsBomb,
+                SurroundingBombs = SurroundingBombs,
+                CheckID = CheckID
+            };
         }
     }
 }

CoopSweeper/GameTypes/IField.cs

@@ -30,7 +30,7 @@ namespace CoopSweeper.GameTypes
         FLAG = DisplayState.FLAG
     }
 
-    public interface IField
+    public interface IField : ICloneable<IField>
     {
 
         bool ContainsBomb { get; set; }
@@ -41,6 +41,6 @@ namespace CoopSweeper.GameTypes
 
         FieldState State { get; set; }
 
-        DisplayState GetDisplayState();
+        DisplayState DisplayState { get; }
     }
 }

CoopSweeper/ICloneable.cs

@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace CoopSweeper
+{
+    public interface ICloneable<T> where T : ICloneable<T>
+    {
+        T Clone();
+    }
+}

CoopSweeper/Program.cs

@@ -7,6 +7,7 @@ namespace CoopSweeper
 {
     class Program
     {
+        static IField[,] currentMap = null;
         const int MAP_POS_X = 3;
         const int MAP_POS_Y = 3;
 
@@ -27,7 +28,7 @@ namespace CoopSweeper
                     Console.Write("You won!");
                 else
                     Console.Write("You lost!");
-                DrawMap(MAP_POS_X, MAP_POS_Y, game.Map, cursorPosX, cursorPosY);
+                DrawMap(MAP_POS_X, MAP_POS_Y, game.Map, cursorPosX, cursorPosY, true);
                 Console.ReadKey();
                 StartNewGame(game, cursorPosX, cursorPosY);
             };
@@ -59,7 +60,7 @@ namespace CoopSweeper
                 if (cursorPosX >= game.Map.GetLength(0)) cursorPosX = game.Map.GetLength(0) - 1;
                 if (cursorPosY >= game.Map.GetLength(1)) cursorPosY = game.Map.GetLength(1) - 1;
                 if (fullRedraw)
-                    DrawMap(3, 3, game.Map, cursorPosX, cursorPosY);
+                    DrawMap(3, 3, game.Map, cursorPosX, cursorPosY, true);
                 else if(oldCursorPosX != cursorPosX || oldCursorPosY != cursorPosY)
                 {
                     Console.SetCursorPosition(oldCursorPosX + 3, oldCursorPosY + 3);
@@ -79,7 +80,7 @@ namespace CoopSweeper
             bool fgChanged = false;
             bool bgChanged = false;
             var c = 'E';
-            var state = f.GetDisplayState();
+            var state = f.DisplayState;
             switch (state) {
                 case DisplayState.EMPTY:
                     c = ' ';
@@ -93,8 +94,10 @@ namespace CoopSweeper
                     c = ' ';
                     break;
                 case DisplayState.QUESTIONMARK:
+                    fgChanged = true;
                     bgChanged = true;
                     Console.BackgroundColor = ConsoleColor.Gray;
+                    Console.ForegroundColor = ConsoleColor.DarkBlue;
                     c = '?';
                     break;
                 case DisplayState.BOMB:
@@ -163,20 +166,33 @@ namespace CoopSweeper
             Console.Clear();
             Console.SetCursorPosition(0, 0);
             DrawBorder(MAP_POS_X - 1, MAP_POS_X - 1, game.Map.GetLength(0) + 2, game.Map.GetLength(1) + 2);
-            DrawMap(MAP_POS_X, MAP_POS_Y, game.Map, cursorPosX, cursorPosY);
+            DrawMap(MAP_POS_X, MAP_POS_Y, game.Map, cursorPosX, cursorPosY, false);
         }
 
-        private static void DrawMap(int posX, int posY, IField[,] map, int cursorX, int cursorY)
+        private static void DrawMap(int posX, int posY, IField[,] map, int cursorX, int cursorY, bool doChangeDetection)
         {
-            var res = new string[map.GetLength(1)];
             for (var y = 0; y < map.GetLength(1); y++)
             {
-                Console.SetCursorPosition(posX, posY + y);
+                if(currentMap == null || !doChangeDetection) Console.SetCursorPosition(posX, posY + y);
                 for (var x = 0; x < map.GetLength(0); x++)
                 {
-                    DrawChar(map[x, y], x == cursorX && y == cursorY);
+                    if (currentMap != null && doChangeDetection)
+                    {
+                        var currentField = currentMap[x, y];
+                        var newField = map[x, y];
+                        if (currentField == null || currentField.DisplayState != newField.DisplayState)
+                        {
+                            Console.SetCursorPosition(posX + x, posY + y);
+                            DrawChar(map[x, y], x == cursorX && y == cursorY);
+                        }
+                    }
+                    else
+                    {
+                        DrawChar(map[x, y], x == cursorX && y == cursorY);
+                    }
                 }
             }
+            currentMap = ArrayHelpers.Clone2D(map);
         }
 
         private static void DrawBorder(int posX, int posY, int width, int height)