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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from PySide6.QtCore import Qt, QPoint, QRect, QSize, Property, Slot
from PySide6.QtGui import QPainter, QPen
from PySide6.QtWidgets import QWidget
EMPTY = '-'
CROSS = 'X'
NOUGHT = 'O'
DEFAULT_STATE = "---------"
class TicTacToe(QWidget):
def __init__(self, parent=None):
super().__init__(parent)
self._state = DEFAULT_STATE
self._turn_number = 0
def minimumSizeHint(self):
return QSize(200, 200)
def sizeHint(self):
return QSize(200, 200)
def setState(self, new_state):
self._turn_number = 0
self._state = DEFAULT_STATE
for position in range(min(9, len(new_state))):
mark = new_state[position]
if mark == CROSS or mark == NOUGHT:
self._turn_number += 1
self._change_state_at(position, mark)
position += 1
self.update()
def state(self):
return self._state
@Slot()
def clear_board(self):
self._state = DEFAULT_STATE
self._turn_number = 0
self.update()
def _change_state_at(self, pos, new_state):
self._state = (self._state[:pos] + new_state
+ self._state[pos + 1:])
def mousePressEvent(self, event):
if self._turn_number == 9:
self.clear_board()
return
for position in range(9):
cell = self._cell_rect(position)
if cell.contains(event.position().toPoint()):
if self._state[position] == EMPTY:
new_state = CROSS if self._turn_number % 2 == 0 else NOUGHT
self._change_state_at(position, new_state)
self._turn_number += 1
self.update()
def paintEvent(self, event):
with QPainter(self) as painter:
painter.setRenderHint(QPainter.Antialiasing)
painter.setPen(QPen(Qt.darkGreen, 1))
painter.drawLine(self._cell_width(), 0,
self._cell_width(), self.height())
painter.drawLine(2 * self._cell_width(), 0,
2 * self._cell_width(), self.height())
painter.drawLine(0, self._cell_height(),
self.width(), self._cell_height())
painter.drawLine(0, 2 * self._cell_height(),
self.width(), 2 * self._cell_height())
painter.setPen(QPen(Qt.darkBlue, 2))
for position in range(9):
cell = self._cell_rect(position)
if self._state[position] == CROSS:
painter.drawLine(cell.topLeft(), cell.bottomRight())
painter.drawLine(cell.topRight(), cell.bottomLeft())
elif self._state[position] == NOUGHT:
painter.drawEllipse(cell)
painter.setPen(QPen(Qt.yellow, 3))
for position in range(0, 8, 3):
if (self._state[position] != EMPTY
and self._state[position + 1] == self._state[position]
and self._state[position + 2] == self._state[position]):
y = self._cell_rect(position).center().y()
painter.drawLine(0, y, self.width(), y)
self._turn_number = 9
for position in range(3):
if (self._state[position] != EMPTY
and self._state[position + 3] == self._state[position]
and self._state[position + 6] == self._state[position]):
x = self._cell_rect(position).center().x()
painter.drawLine(x, 0, x, self.height())
self._turn_number = 9
if (self._state[0] != EMPTY and self._state[4] == self._state[0]
and self._state[8] == self._state[0]):
painter.drawLine(0, 0, self.width(), self.height())
self._turn_number = 9
if (self._state[2] != EMPTY and self._state[4] == self._state[2]
and self._state[6] == self._state[2]):
painter.drawLine(0, self.height(), self.width(), 0)
self._turn_number = 9
def _cell_rect(self, position):
h_margin = self.width() / 30
v_margin = self.height() / 30
row = int(position / 3)
column = position - 3 * row
pos = QPoint(column * self._cell_width() + h_margin,
row * self._cell_height() + v_margin)
size = QSize(self._cell_width() - 2 * h_margin,
self._cell_height() - 2 * v_margin)
return QRect(pos, size)
def _cell_width(self):
return self.width() / 3
def _cell_height(self):
return self.height() / 3
state = Property(str, state, setState)
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