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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
# PySide6 tutorial 11
import sys
import math
from PySide6.QtCore import QPoint, QRect, QTimer, Qt, Signal, Slot
from PySide6.QtGui import QColor, QFont, QPainter, QPalette, QRegion
from PySide6.QtWidgets import (QApplication, QGridLayout, QHBoxLayout,
QLCDNumber, QPushButton, QSlider,
QVBoxLayout, QWidget)
class LCDRange(QWidget):
value_changed = Signal(int)
def __init__(self, parent=None):
super().__init__(parent)
lcd = QLCDNumber(2)
self.slider = QSlider(Qt.Horizontal)
self.slider.setRange(0, 99)
self.slider.setValue(0)
self.slider.valueChanged.connect(lcd.display)
self.slider.valueChanged.connect(self.value_changed)
layout = QVBoxLayout(self)
layout.addWidget(lcd)
layout.addWidget(self.slider)
self.setFocusProxy(self.slider)
def value(self):
return self.slider.value()
@Slot(int)
def set_value(self, value):
self.slider.setValue(value)
def set_range(self, minValue, maxValue):
if minValue < 0 or maxValue > 99 or minValue > maxValue:
qWarning(f"LCDRange::setRange({minValue}, {maxValue})\n"
"\tRange must be 0..99\n"
"\tand minValue must not be greater than maxValue")
return
self.slider.setRange(minValue, maxValue)
class CannonField(QWidget):
angle_changed = Signal(int)
force_changed = Signal(int)
def __init__(self, parent=None):
super().__init__(parent)
self._current_angle = 45
self._current_force = 0
self._timer_count = 0
self._auto_shoot_timer = QTimer(self)
self._auto_shoot_timer.timeout.connect(self.move_shot)
self._shoot_angle = 0
self._shoot_force = 0
self.setPalette(QPalette(QColor(250, 250, 200)))
self.setAutoFillBackground(True)
def angle(self):
return self._current_angle
@Slot(int)
def set_angle(self, angle):
if angle < 5:
angle = 5
if angle > 70:
angle = 70
if self._current_angle == angle:
return
self._current_angle = angle
self.update()
self.angle_changed.emit(self._current_angle)
def force(self):
return self._current_force
@Slot(int)
def set_force(self, force):
if force < 0:
force = 0
if self._current_force == force:
return
self._current_force = force
self.force_changed.emit(self._current_force)
@Slot()
def shoot(self):
if self._auto_shoot_timer.isActive():
return
self._timer_count = 0
self._shoot_angle = self._current_angle
self._shoot_force = self._current_force
self._auto_shoot_timer.start(5)
@Slot()
def move_shot(self):
region = QRegion(self.shot_rect())
self._timer_count += 1
shot_r = self.shot_rect()
if shot_r.x() > self.width() or shot_r.y() > self.height():
self._auto_shoot_timer.stop()
else:
region = region.united(QRegion(shot_r))
self.update(region)
def paintEvent(self, event):
with QPainter(self) as painter:
self.paint_cannon(painter)
if self._auto_shoot_timer.isActive():
self.paint_shot(painter)
def paint_shot(self, painter):
painter.setPen(Qt.NoPen)
painter.setBrush(Qt.black)
painter.drawRect(self.shot_rect())
barrel_rect = QRect(33, -4, 15, 8)
def paint_cannon(self, painter):
painter.setPen(Qt.NoPen)
painter.setBrush(Qt.blue)
painter.save()
painter.translate(0, self.height())
painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16)
painter.rotate(-self._current_angle)
painter.drawRect(CannonField.barrel_rect)
painter.restore()
def cannon_rect(self):
result = QRect(0, 0, 50, 50)
result.moveBottomLeft(self.rect().bottomLect())
return result
def shot_rect(self):
gravity = 4.0
time = self._timer_count / 40.0
velocity = self._shoot_force
radians = self._shoot_angle * math.pi / 180
velx = velocity * math.cos(radians)
vely = velocity * math.sin(radians)
x0 = (CannonField.barrel_rect.right() + 5) * math.cos(radians)
y0 = (CannonField.barrel_rect.right() + 5) * math.sin(radians)
x = x0 + velx * time
y = y0 + vely * time - 0.5 * gravity * time * time
result = QRect(0, 0, 6, 6)
result.moveCenter(QPoint(round(x), self.height() - 1 - round(y)))
return result
class MyWidget(QWidget):
def __init__(self, parent=None):
super().__init__(parent)
quit = QPushButton("&Quit")
quit.setFont(QFont("Times", 18, QFont.Bold))
quit.clicked.connect(qApp.quit)
angle = LCDRange()
angle.set_range(5, 70)
force = LCDRange()
force.set_range(10, 50)
cannon_field = CannonField()
angle.value_changed.connect(cannon_field.set_angle)
cannon_field.angle_changed.connect(angle.set_value)
force.value_changed.connect(cannon_field.set_force)
cannon_field.force_changed.connect(force.set_value)
shoot = QPushButton("&Shoot")
shoot.setFont(QFont("Times", 18, QFont.Bold))
shoot.clicked.connect(cannon_field.shoot)
top_layout = QHBoxLayout()
top_layout.addWidget(shoot)
top_layout.addStretch(1)
left_layout = QVBoxLayout()
left_layout.addWidget(angle)
left_layout.addWidget(force)
grid_layout = QGridLayout(self)
grid_layout.addWidget(quit, 0, 0)
grid_layout.addLayout(top_layout, 0, 1)
grid_layout.addLayout(left_layout, 1, 0)
grid_layout.addWidget(cannon_field, 1, 1, 2, 1)
grid_layout.setColumnStretch(1, 10)
angle.set_value(60)
force.set_value(25)
angle.setFocus()
if __name__ == '__main__':
app = QApplication(sys.argv)
widget = MyWidget()
widget.setGeometry(100, 100, 500, 355)
widget.show()
sys.exit(app.exec())
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