Article Outline
Python pyqt (gui) example 'collidingmice'
Modules used in program:
import mice_rcimport math
collidingmice
Python pyqt example: collidingmice
#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
## the names of its contributors may be used to endorse or promote
## products derived from this software without specific prior written
## permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################
import math
from PyQt5.QtCore import (qAbs, QLineF, QPointF, QRectF, qrand, qsrand, Qt,
QTime, QTimer)
from PyQt5.QtGui import (QBrush, QColor, QPainter, QPainterPath, QPixmap,
QPolygonF)
from PyQt5.QtWidgets import (QApplication, QGraphicsItem, QGraphicsScene,
QGraphicsView, QGraphicsWidget)
import mice_rc
class Mouse(QGraphicsItem):
Pi = math.pi
TwoPi = 2.0 * Pi
# Create the bounding rectangle once.
adjust = 0.5
BoundingRect = QRectF(-20 - adjust, -22 - adjust, 40 + adjust, 83 + adjust)
def __init__(self):
super(Mouse, self).__init__()
self.angle = 0.0
self.speed = 0.0
self.mouseEyeDirection = 0.0
self.color = QColor(qrand() % 256, qrand() % 256, qrand() % 256)
self.setRotation(qrand() % (360 * 16))
# In the C++ version of this example, this class is also derived from
# QObject in order to receive timer events. PyQt does not support
# deriving from more than one wrapped class so we just create an
# explicit timer instead.
self.timer = QTimer()
self.timer.timeout.connect(self.timerEvent)
self.timer.start(1000 / 33)
@staticmethod
def normalizeAngle(angle):
while angle < 0:
angle += Mouse.TwoPi
while angle > Mouse.TwoPi:
angle -= Mouse.TwoPi
return angle
def boundingRect(self):
return Mouse.BoundingRect
def shape(self):
path = QPainterPath()
path.addRect(-10, -20, 20, 40)
return path;
def paint(self, painter, option, widget):
# Body.
painter.setBrush(self.color)
painter.drawEllipse(-10, -20, 20, 40)
# Eyes.
painter.setBrush(Qt.white)
painter.drawEllipse(-10, -17, 8, 8)
painter.drawEllipse(2, -17, 8, 8)
# Nose.
painter.setBrush(Qt.black)
painter.drawEllipse(QRectF(-2, -22, 4, 4))
# Pupils.
painter.drawEllipse(QRectF(-8.0 + self.mouseEyeDirection, -17, 4, 4))
painter.drawEllipse(QRectF(4.0 + self.mouseEyeDirection, -17, 4, 4))
# Ears.
if self.scene().collidingItems(self):
painter.setBrush(Qt.red)
else:
painter.setBrush(Qt.darkYellow)
painter.drawEllipse(-17, -12, 16, 16)
painter.drawEllipse(1, -12, 16, 16)
# Tail.
path = QPainterPath(QPointF(0, 20))
path.cubicTo(-5, 22, -5, 22, 0, 25)
path.cubicTo(5, 27, 5, 32, 0, 30)
path.cubicTo(-5, 32, -5, 42, 0, 35)
painter.setBrush(Qt.NoBrush)
painter.drawPath(path)
def timerEvent(self):
# Don't move too far away.
lineToCenter = QLineF(QPointF(0, 0), self.mapFromScene(0, 0))
if lineToCenter.length() > 150:
angleToCenter = math.acos(lineToCenter.dx() / lineToCenter.length())
if lineToCenter.dy() < 0:
angleToCenter = Mouse.TwoPi - angleToCenter;
angleToCenter = Mouse.normalizeAngle((Mouse.Pi - angleToCenter) + Mouse.Pi / 2)
if angleToCenter < Mouse.Pi and angleToCenter > Mouse.Pi / 4:
# Rotate left.
self.angle += [-0.25, 0.25][self.angle < -Mouse.Pi / 2]
elif angleToCenter >= Mouse.Pi and angleToCenter < (Mouse.Pi + Mouse.Pi / 2 + Mouse.Pi / 4):
# Rotate right.
self.angle += [-0.25, 0.25][self.angle < Mouse.Pi / 2]
elif math.sin(self.angle) < 0:
self.angle += 0.25
elif math.sin(self.angle) > 0:
self.angle -= 0.25
# Try not to crash with any other mice.
dangerMice = self.scene().items(QPolygonF([self.mapToScene(0, 0),
self.mapToScene(-30, -50),
self.mapToScene(30, -50)]))
for item in dangerMice:
if item is self:
continue
lineToMouse = QLineF(QPointF(0, 0), self.mapFromItem(item, 0, 0))
angleToMouse = math.acos(lineToMouse.dx() / lineToMouse.length())
if lineToMouse.dy() < 0:
angleToMouse = Mouse.TwoPi - angleToMouse
angleToMouse = Mouse.normalizeAngle((Mouse.Pi - angleToMouse) + Mouse.Pi / 2)
if angleToMouse >= 0 and angleToMouse < Mouse.Pi / 2:
# Rotate right.
self.angle += 0.5
elif angleToMouse <= Mouse.TwoPi and angleToMouse > (Mouse.TwoPi - Mouse.Pi / 2):
# Rotate left.
self.angle -= 0.5
# Add some random movement.
if len(dangerMice) > 1 and (qrand() % 10) == 0:
if qrand() % 1:
self.angle += (qrand() % 100) / 500.0
else:
self.angle -= (qrand() % 100) / 500.0
self.speed += (-50 + qrand() % 100) / 100.0
dx = math.sin(self.angle) * 10
self.mouseEyeDirection = 0.0 if qAbs(dx / 5) < 1 else dx / 5
self.setRotation(self.rotation() + dx)
self.setPos(self.mapToParent(0, -(3 + math.sin(self.speed) * 3)))
if __name__ == '__main__':
import sys
MouseCount = 7
app = QApplication(sys.argv)
qsrand(QTime(0,0,0).secsTo(QTime.currentTime()))
scene = QGraphicsScene()
scene.setSceneRect(-300, -300, 600, 600)
scene.setItemIndexMethod(QGraphicsScene.NoIndex)
for i in range(MouseCount):
mouse = Mouse()
mouse.setPos(math.sin((i * 6.28) / MouseCount) * 200,
math.cos((i * 6.28) / MouseCount) * 200)
scene.addItem(mouse)
view = QGraphicsView(scene)
view.setRenderHint(QPainter.Antialiasing)
view.setBackgroundBrush(QBrush(QPixmap(':/images/cheese.jpg')))
view.setCacheMode(QGraphicsView.CacheBackground)
view.setViewportUpdateMode(QGraphicsView.BoundingRectViewportUpdate)
view.setDragMode(QGraphicsView.ScrollHandDrag)
view.setWindowTitle("Colliding Mice")
view.resize(400, 300)
view.show()
sys.exit(app.exec_())
Useful links
- Learn PyQt: https://pythonbasics.org/pyqt-hello-world/
- Install PyQt: https://pythonbasics.org/install-pyqt/