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
|
/****************************************************************************
**
** 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "mouse.h"
#include "gesturerecognizerlinjazax.h"
#include "linjazaxgesture.h"
#include <QtGui>
#include <math.h>
#define ZOOMING_ANIMATION
#ifdef ZOOMING_ANIMATION
static const int AnimationSteps = 10;
#endif
static const int MouseCount = 7;
class PannableGraphicsView : public QGraphicsView
{
Q_OBJECT
public:
PannableGraphicsView(QGraphicsScene *scene, QWidget *parent = 0)
: QGraphicsView(scene, parent)
{
grabGesture(QLatin1String("LinjaZax"));
#ifdef ZOOMING_ANIMATION
timeline = new QTimeLine(700, this);
timeline->setFrameRange(0, AnimationSteps);
connect(timeline, SIGNAL(frameChanged(int)), this, SLOT(animationStep(int)));
#endif
}
protected:
bool event(QEvent *event)
{
if (event->type() == QEvent::Gesture) {
QGestureEvent *ge = static_cast<QGestureEvent*>(event);
const LinjaZaxGesture *g = static_cast<const LinjaZaxGesture*>(ge->gesture("LinjaZax"));
if (g) {
switch (g->zoomState()) {
case LinjaZaxGesture::ZoomingIn:
#ifdef ZOOMING_ANIMATION
scaleStep = 1. + 0.5/AnimationSteps;
timeline->stop();
timeline->start();
#else
scale(1.5, 1.5);
#endif
break;
case LinjaZaxGesture::ZoomingOut:
#ifdef ZOOMING_ANIMATION
scaleStep = 1. - 0.5/AnimationSteps;
timeline->stop();
timeline->start();
#else
scale(0.6, 0.6);
#endif
break;
default:
break;
};
QPoint pt = g->pos() - g->lastPos();
horizontalScrollBar()->setValue(horizontalScrollBar()->value() - pt.x());
verticalScrollBar()->setValue(verticalScrollBar()->value() - pt.y());
event->accept();
return true;
}
}
return QGraphicsView::event(event);
}
private slots:
#ifdef ZOOMING_ANIMATION
void animationStep(int step)
{
scale(scaleStep, scaleStep);
}
private:
qreal scaleStep;
QTimeLine *timeline;
#endif
};
//! [0]
int main(int argc, char **argv)
{
QApplication app(argc, argv);
app.addGestureRecognizer(new GestureRecognizerLinjaZax);
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
//! [0]
//! [1]
QGraphicsScene scene;
scene.setSceneRect(-600, -600, 1200, 1200);
//! [1] //! [2]
scene.setItemIndexMethod(QGraphicsScene::NoIndex);
//! [2]
//! [3]
for (int i = 0; i < MouseCount; ++i) {
Mouse *mouse = new Mouse;
mouse->setPos(::sin((i * 6.28) / MouseCount) * 200,
::cos((i * 6.28) / MouseCount) * 200);
scene.addItem(mouse);
}
//! [3]
//! [4]
PannableGraphicsView view(&scene);
view.setRenderHint(QPainter::Antialiasing);
view.setBackgroundBrush(QPixmap(":/images/cheese.jpg"));
//! [4] //! [5]
view.setCacheMode(QGraphicsView::CacheBackground);
view.setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
//view.setDragMode(QGraphicsView::ScrollHandDrag);
//! [5] //! [6]
view.setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Colliding Mice"));
view.resize(400, 300);
view.show();
return app.exec();
}
//! [6]
#include "main.moc"
|
