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README.md

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+# tictactoe console based game

tictactoe.rb

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+# tic tac toe console game in Ruby
+# Author :  Dewang Shahu 
+# Date    : 27 Feb 2015
+#
+require 'pry'
+
+#constants
+HORIZONTAL_LINE = '-'
+VERTICAL_LINE = "|"
+LINE_JOINT = "+"
+WIDTH = 17
+HEIGHT = 11
+PLAYER_AND_MARKER = {'X' => 'Player', 'O' => 'Computer'}
+VALID_CURRENT_POSITIONS = [1,2,3,4,5,6,7,8,9]
+
+#method to accept position and marker values to draw the board
+def draw_board(grid)
+  for line_no in 0..10 
+    for column_no in 0..16
+          if (line_no != 3 && column_no != 5) && (line_no != 7 && column_no != 11)
+              grid[line_no][column_no] = ' '
+            else
+              grid[line_no][column_no] = '|'
+          end
+
+          if line_no == 3 || line_no == 7
+            if column_no == 5 || column_no == 11
+                grid[line_no][column_no] = LINE_JOINT
+              else
+                grid[line_no][column_no] = "-"
+            end
+      end end
+  end
+end
+
+#methods fills a 3x3 array of markers to fill current positions
+def fill_current_positions(grid, current_positions, position, marker)
+    case position
+    when 1
+      #pry.binding
+      grid[1][2] = marker
+      current_positions[0][0] = marker
+    when 2
+      grid[1][8] = marker
+      current_positions[0][1] = marker
+    when 3
+      grid[1][14] = marker
+      current_positions[0][2] = marker
+    when 4
+      grid[5][2] = marker
+      current_positions[1][0] = marker
+    when 5
+      grid[5][8] = marker  
+      current_positions[1][1] = marker
+    when 6
+      grid[5][14] = marker
+      current_positions[1][2] = marker
+    when 7
+      grid[9][2] = marker
+      current_positions[2][0] = marker
+    when 8
+      grid[9][8] = marker
+      current_positions[2][1] = marker
+    when 9
+      grid[9][14] = marker    
+      current_positions[2][2] = marker
+    end
+end
+
+#methods to draw the game board
+def draw_grid_current_positions(grid)
+  for line_number in 0..10 
+      for column_number in 0..16 
+          print grid[line_number-1][column_number-1]
+      end
+      puts "\n"
+  end
+end
+
+#methods to check the currently occupied positions to reject user\computer's selection for already taken\filled position
+def check_current_positions(current_positions, position)
+  case position
+  when 1
+      if current_positions[0][0] != nil
+          return false
+         else
+          return true
+      end
+  when 2
+      if current_positions[0][1] != nil
+          return false
+         else
+          return true
+      end
+   when 3
+      if current_positions[0][2] != nil
+          return false
+         else
+          return true
+      end 
+    when 4
+    if current_positions[1][0] != nil
+          return false
+       else
+          return true
+      end
+    when 5
+    if current_positions[1][1] != nil
+          return false
+       else
+          return true
+      end
+    when 6
+    if current_positions[1][2] != nil
+          return false
+       else
+          return true
+      end
+    when 7
+    if current_positions[2][0] != nil
+          return false
+       else
+          return true
+      end
+    when 8
+    if current_positions[2][1] != nil
+          return false
+       else
+          return true
+      end
+    when 9
+    if current_positions[2][2] != nil
+          return false
+        else
+          return true
+      end
+  end
+end
+
+#methods to analyse results based on the current positions, it returns the result
+def analyse_results(current_positions)
+  outcome = "pending"
+  PLAYER_AND_MARKER.each do |marker, current_player|
+    current_positions.each.with_index do |current_content, index|
+      if current_content[0] == marker && current_content[1] == marker && current_content[2] == marker
+          return current_player + " won!!!"
+      end
+    end
+  end
+
+  PLAYER_AND_MARKER.each do |marker, current_player|
+        if current_positions[0][0] == marker && current_positions[1][0] == marker && current_positions[2][0] == marker
+            return current_player + " won!!!"
+        elsif current_positions[0][1] == marker && current_positions[1][1] == marker && current_positions[2][1] == marker
+            return current_player + " won!!!"
+        elsif current_positions[0][2] == marker && current_positions[1][2] == marker && current_positions[2][2] == marker
+            return current_player + " won!!!"
+        elsif current_positions[0][0] == marker && current_positions[1][1] == marker && current_positions[2][2] == marker
+            return current_player + " won!!!"
+        elsif current_positions[0][2] == marker && current_positions[1][1] == marker && current_positions[2][0] == marker
+            return current_player + " won!!!"
+        else
+            return outcome
+        end
+    end
+end
+
+
+
+begin
+  grid  = Array.new(WIDTH){Array.new(HEIGHT)}
+  current_positions = Array.new(3){Array.new(3)}
+  another_round = 'y'
+  draw_board(grid)
+  user_position = 0
+  computer_position = 0
+  position_count = 0
+
+  #loop till user selects not play the game anymore
+   while another_round == 'y' do
+    #loop to keep getting user position input in case of user selects an already taken position
+    loop do
+        puts "Choose a position from (1 to 9) to place a piece : "
+        user_position = gets.chomp
+        if !check_current_positions(current_positions,user_position.to_i)
+            puts "*** This position is already filled..please try again"
+          else
+            break
+        end
+    end
+
+    fill_current_positions(grid, current_positions, user_position.to_i, PLAYER_AND_MARKER.key('Player'))
+    position_count += 1
+    outcome = analyse_results(current_positions)
+
+    if position_count < 9 && outcome == 'pending'
+        #loop to keep getting computer's randomly selected position input in case of user selects an already taken position
+        loop do
+              computer_position = VALID_CURRENT_POSITIONS.sample
+              if !check_current_positions(current_positions,computer_position.to_i)
+                next
+              else
+                break
+              end
+        end
+
+        fill_current_positions(grid, current_positions, computer_position.to_i, PLAYER_AND_MARKER.key('Computer'))
+        position_count += 1
+    end
+    draw_grid_current_positions(grid)
+    outcome = analyse_results(current_positions)
+
+    if outcome != 'pending' 
+        puts outcome
+    elsif outcome == 'pending' && position_count == 9
+        puts "It's a tie..."
+    end
+
+    if position_count >= 9 || outcome != 'pending'
+        puts "Play again?(y/n)"
+        another_round = gets.chomp.downcase
+        if another_round == 'y'
+            draw_board(grid)
+            current_positions = Array.new(3){Array.new(3)}
+            user_position = 0
+            position_count = 0
+            computer_position = 0
+          else
+            break
+        end
+      end
+  end
+
+end