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
|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qdeclarativepathinterpolator_p.h"
#include "qdeclarativepath_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmlclass PathInterpolator QQuickPathInterpolator
\inqmlmodule QtQuick 2
\brief The PathInterpolator element provides a way to manually animate along a path.
PathInterpolator provides \c x, \c y, and \c angle information for a particular \c progress
along a path.
In the following example, we animate a green rectangle along a bezier path.
\snippet doc/src/snippets/declarative/pathinterpolator.qml 0
*/
QDeclarativePathInterpolator::QDeclarativePathInterpolator(QObject *parent) :
QObject(parent), _path(0), _x(0), _y(0), _angle(0), _progress(0)
{
}
/*!
\qmlproperty Path QtQuick2::PathInterpolator::path
This property holds the path to interpolate.
For more information on defining a path see the \l Path documentation.
*/
QDeclarativePath *QDeclarativePathInterpolator::path() const
{
return _path;
}
void QDeclarativePathInterpolator::setPath(QDeclarativePath *path)
{
if (_path == path)
return;
if (_path)
disconnect(_path, SIGNAL(changed()), this, SLOT(_q_pathUpdated()));
_path = path;
connect(_path, SIGNAL(changed()), this, SLOT(_q_pathUpdated()));
emit pathChanged();
}
/*!
\qmlproperty real QtQuick2::PathInterpolator::progress
This property holds the current progress along the path.
Typical usage of PathInterpolator is to set the progress
(often via a NumberAnimation), and read the corresponding
values for x, y, and angle (often via bindings to these values).
Progress ranges from 0.0 to 1.0.
*/
qreal QDeclarativePathInterpolator::progress() const
{
return _progress;
}
void QDeclarativePathInterpolator::setProgress(qreal progress)
{
if (progress == _progress)
return;
_progress = progress;
emit progressChanged();
_q_pathUpdated();
}
/*!
\qmlproperty real QtQuick2::PathInterpolator::x
\qmlproperty real QtQuick2::PathInterpolator::y
These properties hold the position of the path at \l progress.
*/
qreal QDeclarativePathInterpolator::x() const
{
return _x;
}
qreal QDeclarativePathInterpolator::y() const
{
return _y;
}
/*!
\qmlproperty real QtQuick2::PathInterpolator::angle
This property holds the angle of the path tangent at \l progress.
Angles are reported clockwise, with zero degrees at the 3 o'clock position.
*/
qreal QDeclarativePathInterpolator::angle() const
{
return _angle;
}
void QDeclarativePathInterpolator::_q_pathUpdated()
{
if (! _path)
return;
qreal angle = 0;
const QPointF pt = _path->sequentialPointAt(_progress, &angle);
if (_x != pt.x()) {
_x = pt.x();
emit xChanged();
}
if (_y != pt.y()) {
_y = pt.y();
emit yChanged();
}
//convert to clockwise
angle = qreal(360) - angle;
if (qFuzzyCompare(angle, qreal(360)))
angle = qreal(0);
if (angle != _angle) {
_angle = angle;
emit angleChanged();
}
}
QT_END_NAMESPACE
|
