Sudoku in Ruby by ChatGPT

sudoku.rb

require 'ruby2d'

# Define constants
GRID_SIZE = 9
CELL_SIZE = 60
WINDOW_SIZE = CELL_SIZE * GRID_SIZE
FONT_SIZE = 20

# Create Window
set title: "Ruby Sudoku", width: WINDOW_SIZE, height: WINDOW_SIZE

# Initial Sudoku Board (0 means empty)
board = Array.new(GRID_SIZE) { Array.new(GRID_SIZE, 0) }
selected_cell = [0, 0]

# Helper to draw the grid
def draw_grid
  (0..GRID_SIZE).each do |i|
    thickness = (i % 3 == 0) ? 4 : 1
    Line.new(x1: i * CELL_SIZE, y1: 0, x2: i * CELL_SIZE, y2: WINDOW_SIZE, width: thickness, color: 'black')
    Line.new(x1: 0, y1: i * CELL_SIZE, x2: WINDOW_SIZE, y2: i * CELL_SIZE, width: thickness, color: 'black')
  end
end

# Draw numbers on the grid
def draw_numbers(board)
  board.each_with_index do |row, y|
    row.each_with_index do |num, x|
      next if num == 0

      Text.new(num.to_s, x: x * CELL_SIZE + 20, y: y * CELL_SIZE + 20, size: FONT_SIZE, color: 'blue')
    end
  end
end

# Highlight selected cell
def highlight_cell(x, y)
  Square.new(x: x * CELL_SIZE, y: y * CELL_SIZE, size: CELL_SIZE, color: 'yellow', opacity: 0.3)
end

# Main draw loop
update do
  clear
  draw_grid
  highlight_cell(*selected_cell)
  draw_numbers(board)
end

# Handle mouse click to select cell
on :mouse_down do |event|
  if event.button == :left
    selected_cell = [event.x / CELL_SIZE, event.y / CELL_SIZE]
  end
end

# Handle keyboard input to place numbers
on :key_down do |event|
  if ('1'..'9').include?(event.key)
    x, y = selected_cell
    board[y][x] = event.key.to_i
  elsif event.key == 'backspace'
    x, y = selected_cell
    board[y][x] = 0
  end
end

show