1#############################################################################
2##
3## Copyright (C) 2013 Riverbank Computing Limited.
4## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
5## All rights reserved.
6##
7## This file is part of the examples of PyQt.
8##
9## $QT_BEGIN_LICENSE:LGPL$
10## Commercial Usage
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12## accordance with the Qt Commercial License Agreement provided with the
13## Software or, alternatively, in accordance with the terms contained in
14## a written agreement between you and Nokia.
15##
16## GNU Lesser General Public License Usage
17## Alternatively, this file may be used under the terms of the GNU Lesser
18## General Public License version 2.1 as published by the Free Software
19## Foundation and appearing in the file LICENSE.LGPL included in the
20## packaging of this file.  Please review the following information to
21## ensure the GNU Lesser General Public License version 2.1 requirements
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24## In addition, as a special exception, Nokia gives you certain additional
25## rights.  These rights are described in the Nokia Qt LGPL Exception
26## version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27##
28## GNU General Public License Usage
29## Alternatively, this file may be used under the terms of the GNU
30## General Public License version 3.0 as published by the Free Software
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39##
40#############################################################################
41
42
43from PyQt5.QtCore import QLineF, QPointF
44
45from guide import Guide
46
47
48class GuideLine(Guide):
49    def __init__(self, line_or_point, follows=None):
50        super(GuideLine, self).__init__(follows)
51
52        if isinstance(line_or_point, QLineF):
53            self.line = line_or_point
54        elif follows is not None:
55            self.line = QLineF(self.prevGuide.endPos(), line_or_point)
56        else:
57            self.line = QLineF(QPointF(0, 0), line_or_point)
58
59    def length(self):
60        return self.line.length()
61
62    def startPos(self):
63        return QPointF(self.line.p1().x() * self.scaleX,
64                self.line.p1().y() * self.scaleY)
65
66    def endPos(self):
67        return QPointF(self.line.p2().x() * self.scaleX,
68                self.line.p2().y() * self.scaleY)
69
70    def guide(self, item, moveSpeed):
71        frame = item.guideFrame - self.startLength
72        endX = (self.line.p1().x() + (frame * self.line.dx() / self.length())) * self.scaleX
73        endY = (self.line.p1().y() + (frame * self.line.dy() / self.length())) * self.scaleY
74        pos = QPointF(endX, endY)
75        self.move(item, pos, moveSpeed)
76