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111 lines
5.2 KiB
Python
111 lines
5.2 KiB
Python
from PyQt4 import QtCore, QtGui
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import math
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from sextante.modeler.ModelerGraphicItem import ModelerGraphicItem
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from sextante.core.GeoAlgorithm import GeoAlgorithm
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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.QGraphicsPathItem):
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def __init__(self, startItem, outputIndex, endItem, paramIndex ,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.paramIndex = paramIndex
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self.outputIndex = outputIndex
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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 paint(self, painter, option, widget=None):
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startItem = self.myStartItem
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endItem = self.myEndItem
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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.paramIndex)
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startPt = self.startItem().getLinkPointForOutput(self.outputIndex)
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if isinstance(self.startItem().element, GeoAlgorithm):
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if self.startItem().element.outputs:
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controlPoints.append(startItem.pos() + startPt)
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controlPoints.append(startItem.pos() + startPt + QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH /2,0))
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controlPoints.append(endItem.pos() + endPt - QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH /2, 0))
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controlPoints.append(endItem.pos() + endPt)
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pt = QtCore.QPointF(startItem.pos() + startPt + QtCore.QPointF(-3, -3))
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painter.drawEllipse(pt.x(), pt.y(), 6, 6)
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pt = QtCore.QPointF(endItem.pos() + endPt + QtCore.QPointF(-3, -3))
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painter.drawEllipse(pt.x(), pt.y(), 6, 6)
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else: # case where there is a dependency on an algorithm not on an output
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controlPoints.append(startItem.pos() + startPt)
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controlPoints.append(startItem.pos() + startPt + QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH /2,0))
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controlPoints.append(endItem.pos() + endPt - QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH /2, 0))
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controlPoints.append(endItem.pos() + endPt)
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else:
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controlPoints.append(startItem.pos())
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controlPoints.append(startItem.pos() + QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH /2,0))
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controlPoints.append(endItem.pos() + endPt - QtCore.QPointF(ModelerGraphicItem.BOX_WIDTH /2, 0))
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controlPoints.append(endItem.pos() + endPt)
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pt = QtCore.QPointF(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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