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diagramscene.pyw
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diagramscene.pyw
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#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2010 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
## the names of its contributors may be used to endorse or promote
## products derived from this software without specific prior written
## permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################
import math
from PyQt4 import QtCore, QtGui
class Arrow(QtGui.QGraphicsLineItem):
def __init__(self, startItem, endItem, parent=None, scene=None):
super(Arrow, self).__init__(parent, scene)
self.arrowHead = QtGui.QPolygonF()
self.myStartItem = startItem
self.myEndItem = endItem
self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, True)
self.myColor = QtCore.Qt.black
self.setPen(QtGui.QPen(self.myColor, 1, QtCore.Qt.SolidLine,
QtCore.Qt.RoundCap, QtCore.Qt.RoundJoin))
def setColor(self, color):
self.myColor = color
def startItem(self):
return self.myStartItem
def endItem(self):
return self.myEndItem
def boundingRect(self):
extra = (self.pen().width() + 20) / 2.0
p1 = self.line().p1()
p2 = self.line().p2()
return QtCore.QRectF(p1, QtCore.QSizeF(p2.x() - p1.x(), p2.y() - p1.y())).normalized().adjusted(-extra, -extra, extra, extra)
def shape(self):
path = super(Arrow, self).shape()
path.addPolygon(self.arrowHead)
return path
def updatePosition(self):
line = QtCore.QLineF(self.mapFromItem(self.myStartItem, 0, 0), self.mapFromItem(self.myEndItem, 0, 0))
self.setLine(line)
def paint(self, painter, option, widget=None):
if (self.myStartItem.collidesWithItem(self.myEndItem)):
return
myStartItem = self.myStartItem
myEndItem = self.myEndItem
myColor = self.myColor
myPen = self.pen()
myPen.setColor(self.myColor)
arrowSize = 20.0
painter.setRenderHint(QtGui.QPainter.Antialiasing)
painter.setPen(myPen)
painter.setBrush(self.myColor)
centerLine = QtCore.QLineF(myStartItem.pos(), myEndItem.pos())
uv = centerLine.unitVector()
endPos = myEndItem.pos()-QtCore.QPointF(uv.dx()*myEndItem.diameter/2, uv.dy()*myEndItem.diameter/2)
# endPolygon = myEndItem.polygon()
# p1 = endPolygon.first() + myEndItem.pos()
# intersectPoint = QtCore.QPointF()
# for i in endPolygon:
# p2 = i + myEndItem.pos()
# polyLine = QtCore.QLineF(p1, p2)
# intersectType = polyLine.intersect(centerLine, intersectPoint)
# if intersectType == QtCore.QLineF.BoundedIntersection:
# break
# p1 = p2
#self.setLine(QtCore.QLineF(intersectPoint, myStartItem.pos()))
self.setLine(QtCore.QLineF(endPos, myStartItem.pos()))
#self.setLine(centerLine)
line = self.line()
angle = math.acos(line.dx() / line.length())
if line.dy() >= 0:
angle = (math.pi * 2.0) - angle
arrowP1 = line.p1() + QtCore.QPointF(math.sin(angle + math.pi / 3.0) * arrowSize,
math.cos(angle + math.pi / 3) * arrowSize)
arrowP2 = line.p1() + QtCore.QPointF(math.sin(angle + math.pi - math.pi / 3.0) * arrowSize,
math.cos(angle + math.pi - math.pi / 3.0) * arrowSize)
self.arrowHead.clear()
for point in [line.p1(), arrowP1, arrowP2]:
self.arrowHead.append(point)
painter.drawLine(line)
painter.drawPolygon(self.arrowHead)
if self.isSelected():
painter.setPen(QtGui.QPen(myColor, 1, QtCore.Qt.DashLine))
myLine = QtCore.QLineF(line)
myLine.translate(0, 4.0)
painter.drawLine(myLine)
myLine.translate(0,-8.0)
painter.drawLine(myLine)
class DiagramTextItem(QtGui.QGraphicsTextItem):
lostFocus = QtCore.pyqtSignal(QtGui.QGraphicsTextItem)
selectedChange = QtCore.pyqtSignal(QtGui.QGraphicsItem)
def __init__(self, parent=None, scene=None):
super(DiagramTextItem, self).__init__(parent, scene)
self.setDocument(QtGui.QTextDocument("test"))
self.setFlag(QtGui.QGraphicsItem.ItemIsMovable)
self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable)
def itemChange(self, change, value):
if change == QtGui.QGraphicsItem.ItemSelectedChange:
self.selectedChange.emit(self)
return value
def focusOutEvent(self, event):
self.setTextInteractionFlags(QtCore.Qt.NoTextInteraction)
self.lostFocus.emit(self)
super(DiagramTextItem, self).focusOutEvent(event)
def mouseDoubleClickEvent(self, event):
if self.textInteractionFlags() == QtCore.Qt.NoTextInteraction:
self.setTextInteractionFlags(QtCore.Qt.TextEditorInteraction)
super(DiagramTextItem, self).mouseDoubleClickEvent(event)
class DiagramItem(QtGui.QGraphicsPolygonItem):
Step, Conditional, StartEnd, Io = range(4)
def __init__(self, diagramType, contextMenu, parent=None, scene=None):
super(DiagramItem, self).__init__(parent, scene)
self.arrows = []
self.diagramType = diagramType
self.contextMenu = contextMenu
path = QtGui.QPainterPath()
if self.diagramType == self.StartEnd:
path.moveTo(200, 50)
path.arcTo(150, 0, 50, 50, 0, 90)
path.arcTo(50, 0, 50, 50, 90, 90)
path.arcTo(50, 50, 50, 50, 180, 90)
path.arcTo(150, 50, 50, 50, 270, 90)
path.lineTo(200, 25)
self.myPolygon = path.toFillPolygon()
elif self.diagramType == self.Conditional:
self.myPolygon = QtGui.QPolygonF([
QtCore.QPointF(-100, 0), QtCore.QPointF(0, 100),
QtCore.QPointF(100, 0), QtCore.QPointF(0, -100),
QtCore.QPointF(-100, 0)])
elif self.diagramType == self.Step:
self.myPolygon = QtGui.QPolygonF([
QtCore.QPointF(-100, -100), QtCore.QPointF(100, -100),
QtCore.QPointF(100, 100), QtCore.QPointF(-100, 100),
QtCore.QPointF(-100, -100)])
else:
self.myPolygon = QtGui.QPolygonF([
QtCore.QPointF(-120, -80), QtCore.QPointF(-70, 80),
QtCore.QPointF(120, 80), QtCore.QPointF(70, -80),
QtCore.QPointF(-120, -80)])
self.setPolygon(self.myPolygon)
self.setFlag(QtGui.QGraphicsItem.ItemIsMovable, True)
self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, True)
def removeArrow(self, arrow):
try:
self.arrows.remove(arrow)
except ValueError:
pass
def removeArrows(self):
for arrow in self.arrows[:]:
arrow.startItem().removeArrow(arrow)
arrow.endItem().removeArrow(arrow)
self.scene().removeItem(arrow)
def addArrow(self, arrow):
self.arrows.append(arrow)
def image(self):
pixmap = QtGui.QPixmap(250, 250)
pixmap.fill(QtCore.Qt.transparent)
painter = QtGui.QPainter(pixmap)
painter.setPen(QtGui.QPen(QtCore.Qt.black, 8))
painter.translate(125, 125)
painter.drawPolyline(self.myPolygon)
return pixmap
def contextMenuEvent(self, event):
self.scene().clearSelection()
self.setSelected(True)
self.contextMenu.exec_(event.screenPos())
def itemChange(self, change, value):
if change == QtGui.QGraphicsItem.ItemPositionChange:
for arrow in self.arrows:
arrow.updatePosition()
return value