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126 lines
5.1 KiB
Python
126 lines
5.1 KiB
Python
from PyQt4 import QtCore, QtGui
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import math
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#portions of this code have been taken and adapted from PyQt examples, released under the following license terms
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#############################################################################
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##
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## Copyright (C) 2010 Riverbank Computing Limited.
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## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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## All rights reserved.
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##
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## This file is part of the examples of PyQt.
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##
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## $QT_BEGIN_LICENSE:BSD$
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## You may use this file under the terms of the BSD license as follows:
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##
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## "Redistribution and use in source and binary forms, with or without
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## modification, are permitted provided that the following conditions are
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## met:
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## * Redistributions of source code must retain the above copyright
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## notice, this list of conditions and the following disclaimer.
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## * Redistributions in binary form must reproduce the above copyright
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## notice, this list of conditions and the following disclaimer in
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## the documentation and/or other materials provided with the
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## distribution.
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## * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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## the names of its contributors may be used to endorse or promote
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## products derived from this software without specific prior written
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## permission.
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##
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## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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## $QT_END_LICENSE$
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##
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#############################################################################
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class ModelerArrowItem(QtGui.QGraphicsLineItem):
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def __init__(self, startItem, endItem, parent=None, scene=None):
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super(ModelerArrowItem, self).__init__(parent, scene)
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self.arrowHead = QtGui.QPolygonF()
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self.myStartItem = startItem
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self.myEndItem = endItem
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self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, False)
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self.myColor = QtCore.Qt.gray
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self.setPen(QtGui.QPen(self.myColor, 1, QtCore.Qt.SolidLine,
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QtCore.Qt.RoundCap, QtCore.Qt.RoundJoin))
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self.setZValue(0)
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def startItem(self):
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return self.myStartItem
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def endItem(self):
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return self.myEndItem
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def boundingRect(self):
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extra = (self.pen().width() + 20) / 2.0
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p1 = self.line().p1()
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p2 = self.line().p2()
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return QtCore.QRectF(p1, QtCore.QSizeF(p2.x() - p1.x(), p2.y() - p1.y())).normalized().adjusted(-extra, -extra, extra, extra)
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def shape(self):
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path = super(ModelerArrowItem, self).shape()
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path.addPolygon(self.arrowHead)
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return path
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def updatePosition(self):
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line = QtCore.QLineF(self.mapFromItem(self.myStartItem, 0, 0), self.mapFromItem(self.myEndItem, 0, 0))
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self.setLine(line)
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def paint(self, painter, option, widget=None):
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#if (self.myStartItem.collidesWithItem(self.myEndItem)):
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#return
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myStartItem = self.myStartItem
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myEndItem = self.myEndItem
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myPen = self.pen()
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myPen.setColor(self.myColor)
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arrowSize = 6.0
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painter.setPen(myPen)
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painter.setBrush(self.myColor)
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centerLine = QtCore.QLineF(myStartItem.pos(), myEndItem.pos())
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endPolygon = myEndItem.polygon()
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p1 = endPolygon.first() + myEndItem.pos()
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intersectPoint = QtCore.QPointF()
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for i in endPolygon:
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p2 = i + myEndItem.pos()
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polyLine = QtCore.QLineF(p1, p2)
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intersectType = polyLine.intersect(centerLine, intersectPoint)
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if intersectType == QtCore.QLineF.BoundedIntersection:
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break
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p1 = p2
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self.setLine(QtCore.QLineF(intersectPoint, myStartItem.pos()))
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line = self.line()
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if line.length() == 0: #division by zero might occur if arrow has no length
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return
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angle = math.acos(line.dx() / line.length())
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if line.dy() >= 0:
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angle = (math.pi * 2.0) - angle
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arrowP1 = line.p1() + QtCore.QPointF(math.sin(angle + math.pi / 3.0) * arrowSize,
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math.cos(angle + math.pi / 3) * arrowSize)
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arrowP2 = line.p1() + QtCore.QPointF(math.sin(angle + math.pi - math.pi / 3.0) * arrowSize,
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math.cos(angle + math.pi - math.pi / 3.0) * arrowSize)
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self.arrowHead.clear()
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for point in [line.p1(), arrowP1, arrowP2]:
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self.arrowHead.append(point)
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painter.drawLine(line)
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painter.drawPolygon(self.arrowHead)
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