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3## Copyright (C) 2013 Riverbank Computing Limited.
4## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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40#############################################################################
41
42
43import math
44
45from PyQt5.QtCore import QPointF
46
47from guide import Guide
48
49
50PI2 = 2 * math.pi
51
52
53class GuideCircle(Guide):
54    CW = 1
55    CCW = -1
56
57    def __init__(self, rect, startAngle=0.0, span=360.0, dir=CCW, follows=None):
58        super(GuideCircle, self).__init__(follows)
59
60        self.radiusX = rect.width() / 2.0
61        self.radiusY = rect.height() / 2.0
62        self.posX = rect.topLeft().x()
63        self.posY = rect.topLeft().y()
64        self.spanRad = span * PI2 / -360.0
65
66        if dir == GuideCircle.CCW:
67            self.startAngleRad = startAngle * PI2 / -360.0
68            self.endAngleRad = self.startAngleRad + self.spanRad
69            self.stepAngleRad = self.spanRad / self.length()
70        else:
71            self.startAngleRad = self.spanRad + (startAngle * PI2 / -360.0)
72            self.endAngleRad = startAngle * PI2 / -360.0
73            self.stepAngleRad = -self.spanRad / self.length()
74
75    def length(self):
76        return abs(self.radiusX * self.spanRad)
77
78    def startPos(self):
79        return QPointF((self.posX + self.radiusX + self.radiusX * math.cos(self.startAngleRad)) * self.scaleX,
80                (self.posY + self.radiusY + self.radiusY * math.sin(self.startAngleRad)) * self.scaleY)
81
82    def endPos(self):
83        return QPointF((self.posX + self.radiusX + self.radiusX * math.cos(self.endAngleRad)) * self.scaleX,
84                (self.posY + self.radiusY + self.radiusY * math.sin(self.endAngleRad)) * self.scaleY)
85
86    def guide(self, item, moveSpeed):
87        frame = item.guideFrame - self.startLength
88        end = QPointF((self.posX + self.radiusX + self.radiusX * math.cos(self.startAngleRad + (frame * self.stepAngleRad))) * self.scaleX,
89                (self.posY + self.radiusY + self.radiusY * math.sin(self.startAngleRad + (frame * self.stepAngleRad))) * self.scaleY)
90        self.move(item, end, moveSpeed)
91