1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "mouse.h"
#include <QGraphicsScene>
#include <QPainter>
#include <QStyleOption>
#include <math.h>
static const double Pi = 3.14159265358979323846264338327950288419717;
static double TwoPi = 2.0 * Pi;
static qreal normalizeAngle(qreal angle)
{
while (angle < 0)
angle += TwoPi;
while (angle > TwoPi)
angle -= TwoPi;
return angle;
}
//! [0]
Mouse::Mouse()
: angle(0), speed(0), mouseEyeDirection(0),
color(qrand() % 256, qrand() % 256, qrand() % 256)
{
setRotation(qrand() % (360 * 16));
}
//! [0]
//! [1]
QRectF Mouse::boundingRect() const
{
qreal adjust = 0.5;
return QRectF(-18 - adjust, -22 - adjust,
36 + adjust, 60 + adjust);
}
//! [1]
//! [2]
QPainterPath Mouse::shape() const
{
QPainterPath path;
path.addRect(-10, -20, 20, 40);
return path;
}
//! [2]
//! [3]
void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
// Body
painter->setBrush(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 + mouseEyeDirection, -17, 4, 4));
painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4));
// Ears
painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red);
painter->drawEllipse(-17, -12, 16, 16);
painter->drawEllipse(1, -12, 16, 16);
// Tail
QPainterPath path(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);
}
//! [3]
//! [4]
void Mouse::advance(int step)
{
if (!step)
return;
//! [4]
// Don't move too far away
//! [5]
QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0));
if (lineToCenter.length() > 150) {
qreal angleToCenter = ::acos(lineToCenter.dx() / lineToCenter.length());
if (lineToCenter.dy() < 0)
angleToCenter = TwoPi - angleToCenter;
angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2);
if (angleToCenter < Pi && angleToCenter > Pi / 4) {
// Rotate left
angle += (angle < -Pi / 2) ? 0.25 : -0.25;
} else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) {
// Rotate right
angle += (angle < Pi / 2) ? 0.25 : -0.25;
}
} else if (::sin(angle) < 0) {
angle += 0.25;
} else if (::sin(angle) > 0) {
angle -= 0.25;
//! [5] //! [6]
}
//! [6]
// Try not to crash with any other mice
//! [7]
QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF()
<< mapToScene(0, 0)
<< mapToScene(-30, -50)
<< mapToScene(30, -50));
foreach (QGraphicsItem *item, dangerMice) {
if (item == this)
continue;
QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0));
qreal angleToMouse = ::acos(lineToMouse.dx() / lineToMouse.length());
if (lineToMouse.dy() < 0)
angleToMouse = TwoPi - angleToMouse;
angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2);
if (angleToMouse >= 0 && angleToMouse < Pi / 2) {
// Rotate right
angle += 0.5;
} else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) {
// Rotate left
angle -= 0.5;
//! [7] //! [8]
}
//! [8] //! [9]
}
//! [9]
// Add some random movement
//! [10]
if (dangerMice.size() > 1 && (qrand() % 10) == 0) {
if (qrand() % 1)
angle += (qrand() % 100) / 500.0;
else
angle -= (qrand() % 100) / 500.0;
}
//! [10]
//! [11]
speed += (-50 + qrand() % 100) / 100.0;
qreal dx = ::sin(angle) * 10;
mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5;
setRotation(rotation() + dx);
setPos(mapToParent(0, -(3 + sin(speed) * 3)));
}
//! [11]
|
