1#!/usr/bin/env python
2
3
4#############################################################################
5##
6## Copyright (C) 2013 Riverbank Computing Limited.
7## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
8## All rights reserved.
9##
10## This file is part of the examples of PyQt.
11##
12## $QT_BEGIN_LICENSE:BSD$
13## You may use this file under the terms of the BSD license as follows:
14##
15## "Redistribution and use in source and binary forms, with or without
16## modification, are permitted provided that the following conditions are
17## met:
18##   * Redistributions of source code must retain the above copyright
19##     notice, this list of conditions and the following disclaimer.
20##   * Redistributions in binary form must reproduce the above copyright
21##     notice, this list of conditions and the following disclaimer in
22##     the documentation and/or other materials provided with the
23##     distribution.
24##   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
25##     the names of its contributors may be used to endorse or promote
26##     products derived from this software without specific prior written
27##     permission.
28##
29## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
40## $QT_END_LICENSE$
41##
42#############################################################################
43
44
45import math
46
47from PyQt5.QtCore import (qAbs, QLineF, QPointF, QRectF, qrand, qsrand, Qt,
48        QTime, QTimer)
49from PyQt5.QtGui import (QBrush, QColor, QPainter, QPainterPath, QPixmap,
50        QPolygonF)
51from PyQt5.QtWidgets import (QApplication, QGraphicsItem, QGraphicsScene,
52        QGraphicsView, QGraphicsWidget)
53
54import mice_rc
55
56
57class Mouse(QGraphicsItem):
58    Pi = math.pi
59    TwoPi = 2.0 * Pi
60
61    # Create the bounding rectangle once.
62    adjust = 0.5
63    BoundingRect = QRectF(-20 - adjust, -22 - adjust, 40 + adjust, 83 + adjust)
64
65    def __init__(self):
66        super(Mouse, self).__init__()
67
68        self.angle = 0.0
69        self.speed = 0.0
70        self.mouseEyeDirection = 0.0
71        self.color = QColor(qrand() % 256, qrand() % 256, qrand() % 256)
72
73        self.setRotation(qrand() % (360 * 16))
74
75        # In the C++ version of this example, this class is also derived from
76        # QObject in order to receive timer events.  PyQt does not support
77        # deriving from more than one wrapped class so we just create an
78        # explicit timer instead.
79        self.timer = QTimer()
80        self.timer.timeout.connect(self.timerEvent)
81        self.timer.start(1000 / 33)
82
83    @staticmethod
84    def normalizeAngle(angle):
85        while angle < 0:
86            angle += Mouse.TwoPi
87        while angle > Mouse.TwoPi:
88            angle -= Mouse.TwoPi
89        return angle
90
91    def boundingRect(self):
92        return Mouse.BoundingRect
93
94    def shape(self):
95        path = QPainterPath()
96        path.addRect(-10, -20, 20, 40)
97        return path;
98
99    def paint(self, painter, option, widget):
100        # Body.
101        painter.setBrush(self.color)
102        painter.drawEllipse(-10, -20, 20, 40)
103
104        # Eyes.
105        painter.setBrush(Qt.white)
106        painter.drawEllipse(-10, -17, 8, 8)
107        painter.drawEllipse(2, -17, 8, 8)
108
109        # Nose.
110        painter.setBrush(Qt.black)
111        painter.drawEllipse(QRectF(-2, -22, 4, 4))
112
113        # Pupils.
114        painter.drawEllipse(QRectF(-8.0 + self.mouseEyeDirection, -17, 4, 4))
115        painter.drawEllipse(QRectF(4.0 + self.mouseEyeDirection, -17, 4, 4))
116
117        # Ears.
118        if self.scene().collidingItems(self):
119            painter.setBrush(Qt.red)
120        else:
121            painter.setBrush(Qt.darkYellow)
122
123        painter.drawEllipse(-17, -12, 16, 16)
124        painter.drawEllipse(1, -12, 16, 16)
125
126        # Tail.
127        path = QPainterPath(QPointF(0, 20))
128        path.cubicTo(-5, 22, -5, 22, 0, 25)
129        path.cubicTo(5, 27, 5, 32, 0, 30)
130        path.cubicTo(-5, 32, -5, 42, 0, 35)
131        painter.setBrush(Qt.NoBrush)
132        painter.drawPath(path)
133
134    def timerEvent(self):
135        # Don't move too far away.
136        lineToCenter = QLineF(QPointF(0, 0), self.mapFromScene(0, 0))
137        if lineToCenter.length() > 150:
138            angleToCenter = math.acos(lineToCenter.dx() / lineToCenter.length())
139            if lineToCenter.dy() < 0:
140                angleToCenter = Mouse.TwoPi - angleToCenter;
141            angleToCenter = Mouse.normalizeAngle((Mouse.Pi - angleToCenter) + Mouse.Pi / 2)
142
143            if angleToCenter < Mouse.Pi and angleToCenter > Mouse.Pi / 4:
144                # Rotate left.
145                self.angle += [-0.25, 0.25][self.angle < -Mouse.Pi / 2]
146            elif angleToCenter >= Mouse.Pi and angleToCenter < (Mouse.Pi + Mouse.Pi / 2 + Mouse.Pi / 4):
147                # Rotate right.
148                self.angle += [-0.25, 0.25][self.angle < Mouse.Pi / 2]
149        elif math.sin(self.angle) < 0:
150            self.angle += 0.25
151        elif math.sin(self.angle) > 0:
152            self.angle -= 0.25
153
154        # Try not to crash with any other mice.
155        dangerMice = self.scene().items(QPolygonF([self.mapToScene(0, 0),
156                                                         self.mapToScene(-30, -50),
157                                                         self.mapToScene(30, -50)]))
158
159        for item in dangerMice:
160            if item is self:
161                continue
162
163            lineToMouse = QLineF(QPointF(0, 0), self.mapFromItem(item, 0, 0))
164            angleToMouse = math.acos(lineToMouse.dx() / lineToMouse.length())
165            if lineToMouse.dy() < 0:
166                angleToMouse = Mouse.TwoPi - angleToMouse
167            angleToMouse = Mouse.normalizeAngle((Mouse.Pi - angleToMouse) + Mouse.Pi / 2)
168
169            if angleToMouse >= 0 and angleToMouse < Mouse.Pi / 2:
170                # Rotate right.
171                self.angle += 0.5
172            elif angleToMouse <= Mouse.TwoPi and angleToMouse > (Mouse.TwoPi - Mouse.Pi / 2):
173                # Rotate left.
174                self.angle -= 0.5
175
176        # Add some random movement.
177        if len(dangerMice) > 1 and (qrand() % 10) == 0:
178            if qrand() % 1:
179                self.angle += (qrand() % 100) / 500.0
180            else:
181                self.angle -= (qrand() % 100) / 500.0
182
183        self.speed += (-50 + qrand() % 100) / 100.0
184
185        dx = math.sin(self.angle) * 10
186        self.mouseEyeDirection = 0.0 if qAbs(dx / 5) < 1 else dx / 5
187
188        self.setRotation(self.rotation() + dx)
189        self.setPos(self.mapToParent(0, -(3 + math.sin(self.speed) * 3)))
190
191
192if __name__ == '__main__':
193
194    import sys
195
196    MouseCount = 7
197
198    app = QApplication(sys.argv)
199    qsrand(QTime(0,0,0).secsTo(QTime.currentTime()))
200
201    scene = QGraphicsScene()
202    scene.setSceneRect(-300, -300, 600, 600)
203    scene.setItemIndexMethod(QGraphicsScene.NoIndex)
204
205    for i in range(MouseCount):
206        mouse = Mouse()
207        mouse.setPos(math.sin((i * 6.28) / MouseCount) * 200,
208                     math.cos((i * 6.28) / MouseCount) * 200)
209        scene.addItem(mouse)
210
211    view = QGraphicsView(scene)
212    view.setRenderHint(QPainter.Antialiasing)
213    view.setBackgroundBrush(QBrush(QPixmap(':/images/cheese.jpg')))
214    view.setCacheMode(QGraphicsView.CacheBackground)
215    view.setViewportUpdateMode(QGraphicsView.BoundingRectViewportUpdate)
216    view.setDragMode(QGraphicsView.ScrollHandDrag)
217    view.setWindowTitle("Colliding Mice")
218    view.resize(400, 300)
219    view.show()
220
221    sys.exit(app.exec_())
222