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
|
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickpathinterpolator_p.h"
#include "qquickpath_p.h"
QT_BEGIN_NAMESPACE
/*!
\qmltype PathInterpolator
\instantiates QQuickPathInterpolator
\inqmlmodule QtQuick
\ingroup qtquick-animation-control
\brief Specifies how 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 qml/pathinterpolator.qml 0
*/
QQuickPathInterpolator::QQuickPathInterpolator(QObject *parent) :
QObject(parent), _path(0), _x(0), _y(0), _angle(0), _progress(0)
{
}
/*!
\qmlproperty Path QtQuick::PathInterpolator::path
This property holds the path to interpolate.
For more information on defining a path see the \l Path documentation.
*/
QQuickPath *QQuickPathInterpolator::path() const
{
return _path;
}
void QQuickPathInterpolator::setPath(QQuickPath *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 QtQuick::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 QQuickPathInterpolator::progress() const
{
return _progress;
}
void QQuickPathInterpolator::setProgress(qreal progress)
{
progress = qMin(qMax(progress, (qreal)0.0), (qreal)1.0);
if (progress == _progress)
return;
_progress = progress;
emit progressChanged();
_q_pathUpdated();
}
/*!
\qmlproperty real QtQuick::PathInterpolator::x
\qmlproperty real QtQuick::PathInterpolator::y
These properties hold the position of the path at \l progress.
*/
qreal QQuickPathInterpolator::x() const
{
return _x;
}
qreal QQuickPathInterpolator::y() const
{
return _y;
}
/*!
\qmlproperty real QtQuick::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 QQuickPathInterpolator::angle() const
{
return _angle;
}
void QQuickPathInterpolator::_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
|
