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Started retro tetris game

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Started developing a retro version of Tetris, following
the planning on the board of the classroom
(see planning.jpg).

Moved cursor work into cursor.
This commit is contained in:
Chris Proctor
2025-12-18 17:45:39 -05:00
parent b7aa246380
commit c8d1ddd58f
10 changed files with 145 additions and 4 deletions
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cursor/play_game.py Normal file
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# Tetris game adapted for retro module (graphics-based Pythonista)
# Import libraries for random piece selection and timing
import random
import time
# Import retro module for graphics (Pythonista only)
try:
from retro.game import Game as RetroGame
except ImportError:
RetroGame = None
# Board dimensions: 10 columns wide, 20 rows tall (standard Tetris size)
W, H = 10, 20
# Graphics settings: cell size in pixels for drawing
CELL_W = 30 # pixels wide per cell
CELL_H = 30 # pixels tall per cell
BORDER = 2 # border line width
# 2D game board: 20 rows (height) × 10 columns (width)
# Each cell is either None (empty) or a color value (filled with a block)
board = [[None] * W for _ in range(H)]
# Define all 7 Tetris piece shapes (I, O, T, S, Z, J, L)
# Each shape is stored as a list of (x, y) offsets from the piece's center
BLOCKS = [[] for _ in range(7)]
# Parse ASCII template: each 'o' represents a block, positions calculated from the string
for i, line in enumerate('''
oo o o oo oo o
oooo oo ooo ooo oo oo ooo'''.split('\n')):
for j, char in enumerate(line):
if char == 'o':
# Store block position relative to piece center
BLOCKS[j // 5].append((j%5 - 1, -i + 2))
# Function to check if a piece can be placed at a given position
# Returns True if the position is valid (no collisions), False otherwise
def can_place_block_clipped(block, x0, y0):
# Check each cell of the piece
for dx, dy in block:
# Calculate actual position
x, y = x0 + dx, y0 + dy
# Check if position is out of bounds or collides with existing blocks
if not (0 <= x < W and 0 <= y) or (y < H and board[y][x]):
return False
return True
# Function to lock a piece permanently onto the board
# Marks each cell of the piece as filled
def place_block(block, x0, y0):
# Assume placement is complete initially
complete = True
# Place each block cell on the board
for dx, dy in block:
x, y = x0 + dx, y0 + dy
# Only place if within board bounds (x and y must be valid)
if 0 <= x < W and 0 <= y < H:
board[y][x] = 'blue' # Mark cell as filled with color 'blue'
else:
# If any part extends outside, placement is incomplete (game over)
complete = False
return complete
# Function to find rows that are completely filled (ready to be cleared)
# Yields (returns) each full row one at a time
def find_completed_rows():
for row in board:
# Check if all cells in the row have a color (no None values)
if all(row):
yield row
# Game state variables
# score: player's current score
score = 0
# t: game tick counter (increments each game loop iteration)
t = 0
# falling_period: how many ticks before a piece falls one row (decreases with level)
falling_period = 0
# state: current game state ('normal' = playing, 'game_over' = lost)
state = 'normal'
# block: currently falling piece (list of offsets), next_block: preview of next piece
block = next_block = None
# x, y: current position of the falling piece (x=column, y=row)
x, y = 0, 0
# falling_generator: iterator that controls piece falling animation
falling_generator = None
# deleting_rows_generator: iterator that controls line-clear animation
deleting_rows_generator = None
# Function to move the current falling piece left, right, or down
# dx: horizontal direction (-1=left, +1=right), dy: vertical direction (-1=down)
def move_block(dx, dy):
global x, y
# Calculate new position
new_x, new_y = x + dx, y + dy
# Check if new position is valid (no collisions)
possible = can_place_block_clipped(block, new_x, new_y)
# If valid, update piece position
if possible:
x, y = new_x, new_y
return possible
# Function to rotate the current falling piece 90 degrees clockwise
# Rotation formula: (x, y) becomes (-y, x)
def rotate_block():
global block
# Calculate rotated positions
new_block = [(-y, x) for x, y in block]
# Check if rotated position is valid (no collisions)
possible = can_place_block_clipped(new_block, x, y)
# If valid, update piece with rotated version
if possible:
block = new_block
return possible
# Function to spawn the next piece and start it falling
# Also calculates falling speed based on level (score)
def reset_block():
global falling_period, block, next_block, x, y, state
# Calculate falling period (how many ticks before piece falls): decreases with level
# Higher t (more time) = higher level = faster falling
falling_period = [10, 9, 8, 7, 6, 5, 4][min(t // 100, 6)]
# Swap pieces: current next_block becomes new block, pick random next
new_block = None
while not new_block:
new_block, next_block = next_block, BLOCKS[random.randrange(7)]
# Spawn at center-top of board
x, y = W // 2, H - 1
# Check for game over: if new piece collides immediately, game is over
if not can_place_block_clipped(new_block, x, y):
state = 'game_over'
return
# Set active piece and start falling animation
block = new_block
begin_falling(falling_period)
# Function to create a falling animation generator for a piece
# The piece falls one row every 'period' ticks until it hits bottom
def begin_falling(period):
global falling_generator
def fall():
global falling_generator
# Main falling loop
while True:
# Wait 'period' ticks before falling next row
for t in range(period):
yield # Pause here and resume on next tick
# Try to move piece down one row
if not move_block(0, -1):
# Piece can't move down, so it has landed
break
# When piece lands, clear the falling generator and lock piece
falling_generator = None
place_block_and_begin_deleting()
yield
# Create and start the generator
falling_generator = fall()
# Function to lock the current falling piece onto the board permanently
# Then start checking for completed rows to clear
def place_block_and_begin_deleting():
global block, state
# Save the current piece before clearing it
old_block = block
block = None # Clear active piece
# Place the piece on the board
if not place_block(old_block, x, y):
# If placement failed (piece extended above board), game over
state = 'game_over'
return
# Start animation for clearing completed rows
begin_deleting_rows()
# Function to animate and process line clears
# Completed rows flash and then disappear, with remaining blocks dropping down
def begin_deleting_rows():
global deleting_rows_generator
# Check if any rows are completed
if any(find_completed_rows()):
# Animation duration based on falling period (faster at higher levels)
duration = falling_period
def delete():
global deleting_rows_generator, score
# Animate the row clearing (flash animation)
for t in range(duration):
if t in (0, duration // 2):
# Change color of completed rows (flash effect)
pass
yield # Pause to show animation
# After animation, remove completed rows
incomplete_rows = [row for row in board if not all(row)]
n_deleted = H - len(incomplete_rows)
# Shift remaining rows down and fill with empty rows
board[:] = incomplete_rows + [[None] * W for _ in range(n_deleted)]
# Award points: (number of rows cleared)^2 × 100
score += (n_deleted**2) * 100
# Spawn next piece
reset_block()
deleting_rows_generator = None
yield
# Create and start the generator
deleting_rows_generator = delete()
else:
# No completed rows, just spawn next piece immediately
reset_block()
# Function called once per game tick (100ms)
# Advances animations (falling piece, line clears) and increments the time counter
def update_stage():
global t
# Advance the falling animation generator (piece drops)
if block and falling_generator:
next(falling_generator)
# Advance the line-clear animation generator
if deleting_rows_generator:
next(deleting_rows_generator)
# Increment tick counter (used for level calculation)
t += 1
# Input handler: move piece left
def on_key_left():
if block:
move_block(-1, 0)
# Input handler: move piece right
def on_key_right():
if block:
move_block(1, 0)
# Input handler: soft drop (or lock piece if already at bottom)
def on_key_down():
if block:
if not move_block(0, -1):
place_block_and_begin_deleting()
# Input handler: hard drop (instant fall to bottom)
def on_key_space():
if block:
begin_falling(period=0) # period=0 means fall instantly
# Input handler: rotate piece 90 degrees
def on_key_up():
if block:
rotate_block()
# Retro Game class for rendering and game loop
class TetrisGame:
def __init__(self):
# Game timing
self.seconds = 0
self.tick_interval = 0.1 # 100ms per tick
self.last_update = time.time()
# Initialize game
reset_block()
def draw_board(self):
# Drawing would happen here for retro module
# For now, this is a placeholder for graphics rendering
pass
def draw_piece(self):
# Draw the falling piece
pass
def update(self, dt):
# Update timing
self.seconds += dt
if self.seconds > self.tick_interval:
self.seconds = 0
update_stage()
def on_key(self, key):
# Handle keyboard input
if key == 'left' or key == 'a':
on_key_left()
elif key == 'right' or key == 'd':
on_key_right()
elif key == 'down' or key == 's':
on_key_down()
elif key == 'up' or key == 'w':
on_key_up()
elif key == 'space':
on_key_space()
elif key == 'q':
return False # Quit
return True
# Create and run the game
if __name__ == '__main__':
if RetroGame:
# Use retro module if available
try:
game = TetrisGame()
print('Game initialized. Use arrow keys or WASD to play.')
except Exception as e:
print(f'Error initializing retro game: {e}')
else:
print('Retro module not available. This game requires Pythonista.')