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117 lines
5.4 KiB
Python
117 lines
5.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Portions of this code have been taken and adapted from PyQt
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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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"""
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import math
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from PyQt4 import QtCore, QtGui
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from processing.modeler.ModelerGraphicItem import ModelerGraphicItem
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from processing.modeler.ModelerAlgorithm import Algorithm
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class ModelerArrowItem(QtGui.QGraphicsPathItem):
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def __init__(self, startItem, startIndex, endItem, endIndex,
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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.endIndex = endIndex
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self.startIndex = startIndex
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self.startItem = startItem
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self.endItem = 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 paint(self, painter, option, widget=None):
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myPen = self.pen()
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myPen.setColor(self.myColor)
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painter.setPen(myPen)
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painter.setBrush(self.myColor)
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controlPoints = []
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endPt = self.endItem.getLinkPointForParameter(self.endIndex)
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startPt = self.startItem.getLinkPointForOutput(self.startIndex)
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if isinstance(self.startItem.element, Algorithm):
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if self.startIndex != -1:
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controlPoints.append(self.startItem.pos() + startPt)
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controlPoints.append(self.startItem.pos() + startPt
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+ QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH / 2, 0))
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controlPoints.append(self.endItem.pos() + endPt
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- QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH / 2, 0))
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controlPoints.append(self.endItem.pos() + endPt)
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pt = QtCore.QPointF(self.startItem.pos() + startPt
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+ QtCore.QPointF(-3, -3))
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painter.drawEllipse(pt.x(), pt.y(), 6, 6)
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pt = QtCore.QPointF(self.endItem.pos() + endPt +
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QtCore.QPointF(-3, -3))
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painter.drawEllipse(pt.x(), pt.y(), 6, 6)
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else:
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# Case where there is a dependency on an algorithm not
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# on an output
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controlPoints.append(self.startItem.pos() + startPt)
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controlPoints.append(self.startItem.pos() + startPt
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+ QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH / 2, 0))
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controlPoints.append(self.endItem.pos() + endPt
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- QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH / 2, 0))
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controlPoints.append(self.endItem.pos() + endPt)
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else:
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controlPoints.append(self.startItem.pos())
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controlPoints.append(self.startItem.pos()
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+ QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH / 2, 0))
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controlPoints.append(self.endItem.pos() + endPt
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- QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH / 2, 0))
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controlPoints.append(self.endItem.pos() + endPt)
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pt = QtCore.QPointF(self.endItem.pos() + endPt + QtCore.QPointF(-3, -3))
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painter.drawEllipse(pt.x(), pt.y(), 6, 6)
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path = QtGui.QPainterPath()
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path.moveTo(controlPoints[0])
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path.cubicTo(*controlPoints[1:])
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painter.strokePath(path, painter.pen())
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self.setPath(path)
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