path: root/src/main/python/shapes/shapes.py

from PyQt5 import QtCore, QtWidgets
from PyQt5.QtCore import (QEvent, QFile, QIODevice, QMimeData, QPointF, QRect,
                          QRectF, QSizeF, Qt)
from PyQt5.QtGui import (QBrush, QColor, QCursor, QDrag, QFont, QImage,
                         QPainter, QPainterPath, QPen, QTransform, QTextCursor, QPainterPathStroker)
from PyQt5.QtSvg import QGraphicsSvgItem, QSvgRenderer
from PyQt5.QtWidgets import (QGraphicsColorizeEffect, QGraphicsEllipseItem,
                             QGraphicsItem, QGraphicsPathItem,
                             QGraphicsProxyWidget, QGraphicsSceneHoverEvent,
                             QLineEdit, QMenu, QGraphicsTextItem)

from .line import Line, findIndex
from utils.app import fileImporter

# enum for all directions for line grip items
directionsEnum = [
    "top",
    "right",
    "bottom",
    "left"
]

# orientation enum for size grip items
orientationEnum = [
    Qt.Horizontal,
    Qt.Vertical
]

#For extending Lines for repositioned Rectangular Line Grips
rLGPlus = {}
f = open('./shapes/rLGPlus.txt','r')
dataRead = f.readlines()[1:]
for line in dataRead:

    if not line.__contains__(',') :
        rLGPlus[line.strip()] = []
    else:
        grips = line.strip().split(',')
        rLGPlus[list(rLGPlus.keys())[-1]].append(grips)

class ItemLabel(QGraphicsTextItem):
    """Extends PyQt5's QGraphicsPathItem to create text label for svg item
    """

    def __init__(self, parent=None):
        super().__init__(parent=parent)
        self.setPlainText("abc")
        # graphics setting for text label
        self.setFlags(QGraphicsItem.ItemIsMovable |
                      QGraphicsItem.ItemIsSelectable |
                      QGraphicsItem.ItemIsFocusable)
        self.setFlag(QGraphicsItem.ItemSendsGeometryChanges, True)
        # set initial no text interaction
        self.setTextInteractionFlags(Qt.NoTextInteraction)
        # set initial position just below parent
        self.setPos(self.parentItem().boundingRect().bottomLeft())

    def mouseDoubleClickEvent(self, event):
        # make text editable
        self.setTextInteractionFlags(Qt.TextEditorInteraction)
        self.setFocus()  # set focus to text
        super(ItemLabel, self).mouseDoubleClickEvent(event)

    def focusOutEvent(self, event):
        super(ItemLabel, self).focusOutEvent(event)
        self.setTextInteractionFlags(Qt.NoTextInteraction)  # make text not editable and thus movable

    def __getstate__(self):
        return {
            "text": self.toPlainText(),
            "pos": (self.pos().x(), self.pos().y())
        }

    def __setstate__(self, dict):
        self.setPlainText(dict['text'])
        self.setPos(*dict['pos'])


class GripItem(QGraphicsPathItem):
    """
    Extends QGraphicsPathItem to create the structure of the Grabbable points for resizing shapes and connecting lines.
    Takes two parameters, reference item (On which the grip items are to appear) and the path of the item
    """

    def __init__(self, annotation_item, path, parent=None):
        """
        Extends PyQt5's QGraphicsPathItem to create the general structure of the Grabbable points for resizing shapes.
        """
        QGraphicsPathItem.__init__(self, parent)
        self.m_annotation_item = annotation_item
        # set path of item
        self.setPath(path)
        self.setAcceptHoverEvents(True)
        self.setCursor(QCursor(Qt.PointingHandCursor))

    def mouseReleaseEvent(self, event):
        """
        Automatically deselects grip item on mouse release
        """
        self.setSelected(False)
        super(GripItem, self).mouseReleaseEvent(event)


class SizeGripItem(QGraphicsPathItem):
    """
    Extends grip items for vertical and horizontal directions, with hover events and directional changes
    """

    def __init__(self, index, direction=Qt.Horizontal, parent=None):
        super(SizeGripItem, self).__init__(parent=parent)
        # set graphical setting
        #self.setFlag(QGraphicsItem.ItemIsSelectable, True)
        self.setFlag(QGraphicsItem.ItemIsMovable, True)
        self.setFlag(QGraphicsItem.ItemSendsGeometryChanges, True)
        self.setAcceptHoverEvents(True)
        self.setPen(QPen(Qt.NoPen))
        self.setZValue(2)
        # property direction
        self._direction = (orientationEnum.index(direction) + self.parentItem().rotation) % 4
        self._m_index = index

    @property
    def m_index(self):
        return (self._m_index + self.parentItem().rotation) % 4
    
    @property
    def direction(self):
        """
        property that returns the current intended resize direction of the grip item object
        """
        if self.parentItem().rotation % 2:
            return orientationEnum[(self._direction + 1)%2]
        else:
            return orientationEnum[self._direction]

    def updatePath(self,m_index):
        """updates path of size grip item
        """
        bx = self.parentItem().boundingRect().x()
        by = self.parentItem().boundingRect().y()
        height = self.parentItem().boundingRect().height()
        width = self.parentItem().boundingRect().width()

        path = QPainterPath()
        if(m_index == 0):#top
            by = by+10
            path.moveTo(bx+(width/2)-10,by)
            path.lineTo(bx+(width/2)+10,by)
            path.lineTo(bx+(width/2),by-20)
            path.lineTo(bx+(width/2)-10,by)
        if(m_index == 1):#left
            bx = bx+10
            path.moveTo(bx,by+(height/2)-10)
            path.lineTo(bx,by+(height/2)+10)
            path.lineTo(bx-20,by+(height/2))
            path.lineTo(bx,by+(height/2)-10)
        if(m_index == 2):#bottom
            by = by-10
            path.moveTo(bx+(width/2)-10,by+height)
            path.lineTo (bx+(width/2)+10,by+height)
            path.lineTo (bx+(width/2),by+height+20)
            path.lineTo (bx+(width/2)-10,by+height)
        if(m_index == 3):#right
            bx = bx-10
            path.moveTo(bx+width,by+(height/2)-10)
            path.lineTo(bx+width,by+(height/2)+10)
            path.lineTo(bx+width+20,by+(height/2))
            path.lineTo(bx+width,by+(height/2)-10)
        self.setPath(path)

    def updatePosition(self):
        """updates position of grip items
        """
        self.updatePath(self.m_index)
        pos = self.point(self.m_index)
        self.setEnabled(False)
        self.setPos(pos)
        self.setEnabled(True)

    def point(self, index):
        """
        yields a list of positions of grip items in a node item
        """
        width = self.parentItem().boundingRect().width()
        height = self.parentItem().boundingRect().height()
        if 0 <= index < 4:
            return [
                QPointF(0, -height / 2),
                QPointF(-width / 2, 0),
                QPointF(0, height / 2),
                QPointF(width / 2, 0)
            ][index]

    def hoverEnterEvent(self, event):
        """
        Changes cursor to horizontal resize or vertical resize depending on the direction of the grip item on mouse enter
        """
        if self.direction == Qt.Horizontal:
            self.setCursor(QCursor(Qt.SizeHorCursor))
        else:
            self.setCursor(QCursor(Qt.SizeVerCursor))
        super(SizeGripItem, self).hoverEnterEvent(event)

    def hoverLeaveEvent(self, event):
        """
        reverts cursor to default on mouse leave
        """
        self.setCursor(QCursor(Qt.ArrowCursor))
        super(SizeGripItem, self).hoverLeaveEvent(event)

    def itemChange(self, change, value):
        """
        Moves position of grip item on resize
        """
        if change == QGraphicsItem.ItemPositionChange and self.isEnabled():
            p = QPointF(self.pos())
            if self.direction == Qt.Horizontal:
                p.setX(value.x())
            elif self.direction == Qt.Vertical:
                p.setY(value.y())
            # Find change in positions
            movement = p - self.pos()
            # Set transform to oppose change in transformation due to parent
            transform = QTransform()
            transform.translate(-movement.x() / 2, -movement.y() / 2)
            self.setTransform(transform, True)
            self.parentItem().resize(self.m_index, movement)
            return p
        return super(SizeGripItem, self).itemChange(change, value)

    def mouseReleaseEvent(self, event):
        super(SizeGripItem, self).mouseReleaseEvent(event)
        # Reset transform and update position
        self.resetTransform()
        self.updatePosition()
        # Make parent item move able
        self.parentItem().setFlag(QGraphicsSvgItem.ItemIsMovable, True)
        # If needed, to reset transform of parent set it's position accordingly
        # self.parentItem().setPos(self.parentItem().x() + self.parentItem().transform().dx(), self.parentItem().y() + self.parentItem().transform().dy())
        # self.parentItem().resetTransform()

    def show(self):
        # make self visible
        self.setPen(QPen(QColor(128, 128, 128,150), 2))
        super(SizeGripItem,self).show()

    def hide(self):
        # hide self by setting pen to transparent
        self.setPen(QPen(Qt.NoPen))
        self.setBrush(Qt.transparent)
        super(SizeGripItem,self).hide()


class LineGripItem(QGraphicsPathItem):
    """Extends grip items for connecting lines , with hover events and mouse events
    """
    circle = QPainterPath()
    circle.addEllipse(QRectF(-5, -5, 10, 10))

    def __init__(self, index, grip, parent=None):
        super(LineGripItem, self).__init__(parent=parent)
        self.setPath(LineGripItem.circle)
        # set it's index on item
        self.m_index = index
        # store position of self
        self.position = QPointF(grip[0], grip[1])
        # set location
        self._m_location = directionsEnum.index(grip[2])
        # set size in case of rectangle grip
        self.size = grip[3] if len(grip) == 4 else None
        # stores current line which is in process
        self.tempLine = None
        # stores lines conected to it
        self.lines = []
        # keep previous hovered item when line drawing in process
        self.previousHoveredItem = None
        # set graphical settings
        self.setFlag(QGraphicsItem.ItemIsSelectable, True)
        self.setPen(QPen(QColor("black"), -1))
        self.setAcceptHoverEvents(True)
        self.setCursor(QCursor(Qt.PointingHandCursor))

    @property
    def m_location(self):
        if self.parentItem().__class__ == Line:
            return directionsEnum[self._m_location]
        index = (self._m_location + self.parentItem().rotation)
        if index%2:
            index = (index + 2*self.parentItem().flipH)%4
        else:
            index = (index + 2*self.parentItem().flipV)%4
        return directionsEnum[index]
    
    @m_location.setter
    def m_location(self, location):
        self._m_location = directionsEnum.index(location)

    def shape(self):
        # return interactive path
        qp = QPainterPathStroker()
        qp.setWidth(8)
        # create outline of path
        path = qp.createStroke(self.path())
        return path

    def paint(self, painter, option, widget):
        # draw path with outline of interactive area(shape)
        painter.setPen(self.pen())
        painter.drawPath(self.shape()) # draw outline
        painter.setBrush(self.brush())
        # if rectangle grip
        if self.size:
            painter.save()
            pen = self.pen()
            pen.setWidth(1)
            painter.setPen(pen)
            painter.drawPath(self.path())
            painter.restore()
        else:
            painter.drawPath(self.path())

    def itemChange(self, change, value):
        """
        Moves position of grip item on resize
        """
        if change == QGraphicsItem.ItemSceneHasChanged and not self.scene():
            # on removing from scene remove all lines connected to it
            for line in self.lines:
                if line.scene():
                    line.scene().removeItem(line)
        return super(LineGripItem, self).itemChange(change, value)

    def updatePosition(self):
        width = self.parentItem().boundingRect().width() # width of parent
        height = self.parentItem().boundingRect().height() # height of parent
        # if grip item is rectangle change it's path
        if self.size:
            rect_width = rect_height = 4
            if self.m_location in ["left", "right"]:
                rect_height = (self.size * height) / 100
            else:
                rect_width = (self.size * width) / 100
            path = QPainterPath() # create path
            path.addRect(QRectF(-rect_width / 2, -rect_height / 2, rect_width, rect_height)) # add rect to path
            self.setPath(path) # set path to grip
        # position according to svg co-ordinate
        x = (self.position.x() * width) / 100
        y = (self.position.y() * height) / 100
        # change position into items coordinate
        x -= width / 2
        y -= height / 2
        y = -y
        self.setEnabled(False)
        self.setPos(QPointF(x, y)) # set pos of grip
        self.setEnabled(True)
        # update all lines connected to it
        for line in self.lines:
            line.updateLine()

    def mousePressEvent(self, mouseEvent):
        """Handle all mouse press for this item
        """
        if mouseEvent.button() != Qt.LeftButton:
            return
        # initialize a line and add on scene
        # restrict circle grip to one line
        if self.size is None and len(self.lines) < 0:
            pass
        else:
            startPoint = self.parentItem().mapToScene(self.pos()) # first point of line
            mpos = self.mapToScene(mouseEvent.pos()) # position of mouse
            gap = 0 # distance from center of grip
            if self.size and self.m_location in ["top", "bottom"]:
                gap = (startPoint.x() - mpos.x()) / self.boundingRect().width()
                startPoint.setX(mpos.x())

            elif self.size:
                gap = (startPoint.y() - mpos.y()) / self.boundingRect().height()
                startPoint.setY(mpos.y())

            endPoint = startPoint
            self.tempLine = Line(startPoint, endPoint) # create a line object
            self.tempLine.startGap = gap # set gap to line
            self.scene().addItem(self.tempLine) # add line on scene
        super().mousePressEvent(mouseEvent)

    def mouseMoveEvent(self, mouseEvent):
        """Handle all mouse move for this item
        """
        # if line get started then update it's end point
        if self.tempLine:
            endPoint = mouseEvent.scenePos() # mouse position
            self.tempLine.updateLine(endPoint=endPoint)
        # find item below cursor
        item = self.scene().itemAt(mouseEvent.scenePos().x(), mouseEvent.scenePos().y(),
                                   QTransform())
        # hide grip of previous hovered item
        if self.previousHoveredItem and item != self.previousHoveredItem and \
                item not in self.previousHoveredItem.lineGripItems:
            self.previousHoveredItem.hideLineGripItem()
            #self.previousHoveredItem.hideSizeGripItem()
        super().mouseMoveEvent(mouseEvent)
        # show grip of current hoverde item
        if isinstance(item, NodeItem):
            self.previousHoveredItem = item
            item.showLineGripItem()

    def mouseReleaseEvent(self, mouseEvent):
        """Handle all mouse release for this item"""
        super().mouseReleaseEvent(mouseEvent)
        # set final position of line
        if self.tempLine:
            tag = 0
            items = self.scene().items(QPointF(mouseEvent.scenePos().x(), mouseEvent.scenePos().y()))
            for item in items:
                # end point on grip
                if type(item) == LineGripItem and item != self:
                    endPoint = item.parentItem().mapToScene(item.pos())
                    gap = 0
                    # restrict line to one grip
                    if item.size is None and len(item.lines) > 0:
                        break
                    # in case of rectangle grip
                    if item.size and item.m_location in ["top", "bottom"]:
                        mpos = self.mapToScene(mouseEvent.pos())
                        gap = (endPoint.x() - mpos.x()) / item.boundingRect().width()
                        endPoint.setX(mpos.x())
                    elif item.size:
                        mpos = self.mapToScene(mouseEvent.pos())
                        gap = (endPoint.y() - mpos.y()) / item.boundingRect().height()
                        endPoint.setY(mpos.y())

                    self.tempLine.endGap = gap
                    self.tempLine.setStartGripItem(self)
                    self.tempLine.setEndGripItem(item)
                    if self.tempLine.startGripItem.parentItem() != self.tempLine.endGripItem.parentItem():
                        # update line with end point so it sets final path
                        self.tempLine.updateLine(endPoint=endPoint)
                        #Adjusting line for repositioned retangular grips
                        if self.parentItem().__class__.__name__ in list(rLGPlus.keys()):
                                for tgrip in rLGPlus[self.parentItem().__class__.__name__]:
                                    if(float(tgrip[3]) == 0):
                                        if self.m_location == tgrip[0]:
                                            tempx,tempy = int(tgrip[1]),int(tgrip[2])
                                            self.tempLine.startPoint.setX(self.tempLine.startPoint.x()+tempx)
                                            self.tempLine.startPoint.setY(self.tempLine.startPoint.y()+tempy)
                                    else:
                                        if self.m_location == tgrip[0] and self.size == float(tgrip[3]):
                                            tempx,tempy = int(tgrip[1]),int(tgrip[2])
                                            self.tempLine.startPoint.setX(self.tempLine.startPoint.x()+tempx)
                                            self.tempLine.startPoint.setY(self.tempLine.startPoint.y()+tempy)
                        if item.parentItem().__class__.__name__ in list(rLGPlus.keys()):
                                for tgrip in rLGPlus[item.parentItem().__class__.__name__]:
                                    if(float(tgrip[3]) == 0):
                                        if item.m_location == tgrip[0]:
                                            tempx,tempy = int(tgrip[1]),int(tgrip[2])
                                            self.tempLine.endPoint.setX(self.tempLine.endPoint.x()+tempx)
                                            self.tempLine.endPoint.setY(self.tempLine.endPoint.y()+tempy)
                                    else:
                                        if item.m_location == tgrip[0] and item.size == float(tgrip[3]):
                                            tempx,tempy = int(tgrip[1]),int(tgrip[2])
                                            self.tempLine.endPoint.setX(self.tempLine.endPoint.x()+tempx)
                                            self.tempLine.endPoint.setY(self.tempLine.endPoint.y()+tempy)
                                        
                        self.lines.append(self.tempLine)
                        item.lines.append(self.tempLine)
                        tag = 1
                        break
                # end point on line
                elif type(item) == Line and item != self.tempLine:
                    self.tempLine.setStartGripItem(self)
                    endPoint = mouseEvent.scenePos()
                    self.tempLine.refLine = item
                    self.tempLine.refIndex = findIndex(item, endPoint)
                    # update line with end point so it sets final path
                    self.tempLine.updateLine(endPoint=endPoint)
                    item.midLines.append(self.tempLine) # stores temp line as mid line to other line
                    self.lines.append(self.tempLine)
                    tag = 1
                    break
            self.scene().removeItem(self.tempLine) # remove temp line from scene
            # if line end point is on grip or line
            if tag:
                self.scene().addItemPlus(self.tempLine) # add line on scene

        self.tempLine = None
        self.previousHoveredItem = None

    def show(self):
        """ shows line grip item
        """
        self.setPen(QPen(QColor(0,0,0,150), 1.5))
        self.setBrush(QColor(140,199,198,255))

    def hide(self):
        """ hides line grip item
        """
        if not self.parentItem().isSelected():
            self.setPen(QPen(Qt.transparent))
            self.setBrush(Qt.transparent)


class NodeItem(QGraphicsSvgItem):
    """
        Extends PyQt5's QGraphicsSvgItem to create the basic structure of shapes with given unit operation type
    """

    def __init__(self, unitOperationType=None, parent=None):
        QGraphicsSvgItem.__init__(self, parent)
        self.m_type = str(unitOperationType)
        self.m_renderer = QSvgRenderer(fileImporter(f'{unitOperationType}.svg'))
        self.setSharedRenderer(self.m_renderer)
        # set initial size of item
        self.width = self.m_renderer.defaultSize().width()
        self.height = self.m_renderer.defaultSize().height()
        # set graphical settings for this item
        self.setFlags(QGraphicsSvgItem.ItemIsMovable |
                      QGraphicsSvgItem.ItemIsSelectable |
                      QGraphicsSvgItem.ItemSendsGeometryChanges)
        self.setAcceptHoverEvents(True)
        self.setZValue(2)
        # items connected to this item
        self.lineGripItems = []
        self.sizeGripItems = []
        self.label = None
        self._rotation = 0
        self.flipState = [False, False]
        self.activateGrip = False
    
    @property
    def flipH(self):
        return self.flipState[0]
    
    @property
    def flipV(self):
        return self.flipState[1]
    
    def updateTransformation(self):
        # update transformation on flipstate or rotation change
        transform = QTransform()
        h = -1 if self.flipH else 1
        w = -1 if self.flipV else 1
        transform.rotate(90*self.rotation)
        transform.scale(h, w)
        self.setTransform(transform)
        self.setTransform(transform)
        for i in self.lineGripItems:
            i.setTransform(transform)
            i.updatePosition()
                
    @flipH.setter
    def flipH(self, state):
        self.flipState[0] = state
        self.updateTransformation()

    @flipV.setter
    def flipV(self, state):
        self.flipState[1] = state
        self.updateTransformation()
            
    @property
    def rotation(self):
        return self._rotation
    
    @rotation.setter
    def rotation(self, rotation):
        self._rotation = rotation % 4
        self.updateTransformation()
        
    def boundingRect(self):
        """Overrides QGraphicsSvgItem's boundingRect() virtual public function and
        returns a valid bounding
        """
        return QRectF(-self.width / 2, -self.height / 2, self.width, self.height)

    def paint(self, painter, option, widget):
        """
            Paints the contents of an item in local coordinates.
            :param painter: QPainter instance
            :param option: QStyleOptionGraphicsItem instance
            :param widget: QWidget instance
        """
        # check if render is set
        if not self.m_renderer:
            QGraphicsSvgItem.paint(self, painter, option, widget)
        else:
            self.m_renderer.render(painter, self.boundingRect())  # render svg using painter

    def resize(self, index, movement):
        """Move grip item with changing rect of node item
        """
        self.prepareGeometryChange()
        if index in [0, 1]:
            self.width -= movement.x()
            self.height -= movement.y()
        else:
            self.width += movement.x()
            self.height += movement.y()
        transform = QTransform()
        transform.translate(movement.x() / 2, movement.y() / 2)
        self.setTransform(transform, True)
        self.updateSizeGripItem([index])

    def addGripItem(self):
        """adds grip items
        """
        if self.scene():
            # add grip for resizing
            for i, (direction) in enumerate(
                    (
                            Qt.Vertical,
                            Qt.Horizontal,
                            Qt.Vertical,
                            Qt.Horizontal,
                    )
            ):
                item = SizeGripItem(i, direction, parent=self)
                self.sizeGripItems.append(item)
            # add grip items for connecting lines
            for i in range(len(self.grips)):
                grip = self.grips[i]
                item = LineGripItem(i, grip, parent=self)
                self.lineGripItems.append(item)

    def updateLineGripItem(self):
        """
        updates line grip items
        """
        for item in self.lineGripItems:
            item.updatePosition()

    def updateSizeGripItem(self, index_no_updates=None):
        """
        updates size grip items
        """
        index_no_updates = index_no_updates or []
        for i, item in enumerate(self.sizeGripItems):
            if i not in index_no_updates:
                item.updatePosition()

    def itemChange(self, change, value):
        """Overloads and extends QGraphicsSvgItem to also update grip items
        """
        newPos = value
        # check if item selected is changed
        if change == QGraphicsItem.ItemSelectedHasChanged:
            # show grips if selected
            if value is True:
                self.showLineGripItem()
                self.showSizeGripItem()
            else:
                self.hideLineGripItem()
                if not self.activateGrip:
                    self.hideSizeGripItem()
            return
        # check if transform changed
        if change == QGraphicsItem.ItemTransformHasChanged:
            self.updateLineGripItem()
            return
        # check if position is changed
        if change == QGraphicsItem.ItemPositionHasChanged:
            # update grips
            self.updateLineGripItem()
            self.updateSizeGripItem()
            
            #restrict movable area of Node Item
            
            if self.parent() is not None:
                rect = self.parent().sceneRect() 
                width = self.boundingRect().width()
                height = self.boundingRect().height()
                eWH1 = QPointF(newPos.x()+width,newPos.y()+height)
                eWH2 = QPointF(newPos.x()-width,newPos.y()-height)
                if not rect.__contains__(eWH1) or not rect.__contains__(eWH2) :
                    newPos.setX(min(rect.right()-width+40, max(newPos.x(), rect.left()+90)))
                    newPos.setY(min(rect.bottom()-height, max(newPos.y(), rect.top()+70)))
                    self.setPos(newPos)
            return super(NodeItem,self).itemChange(change, newPos)
        
        # check if item is add on scene
        if change == QGraphicsItem.ItemSceneHasChanged and self.scene():
            # add grips and update them
            self.addGripItem()
            self.updateLineGripItem()
            self.updateSizeGripItem()
            return
        return super(NodeItem, self).itemChange(change, value)

    def hoverEnterEvent(self, event):
        """defines shape highlighting on Mouse Over
        """
        self.showLineGripItem()
        super(NodeItem, self).hoverEnterEvent(event)

    def hoverLeaveEvent(self, event):
        """defines shape highlighting on Mouse Leave
        """
        self.hideLineGripItem()
        #self.hideSizeGripItem()
        super(NodeItem, self).hoverLeaveEvent(event)
    
    def mouseDoubleClickEvent(self, event):
        self.activateGrip = not self.activateGrip
        if self.activateGrip == False:
            self.hideSizeGripItem()
            self.parent().update()
        else:
            self.showSizeGripItem()
        super(NodeItem,self).mouseDoubleClickEvent(event)

    def showLineGripItem(self):
        """shows line grip items of svg item
        """
        for item in self.lineGripItems:
            item.show()

    def hideLineGripItem(self):
        """hide line grip items of svg item
        """
        for item in self.lineGripItems:
            item.hide()
    
    def showSizeGripItem(self):
        """shows size grip items of svg item
        """
        for item in self.sizeGripItems:
            item.show()

    def hideSizeGripItem(self):
        """hide size grip items of svg item
        """
        self.activateGrip = False
        for item in self.sizeGripItems:
            item.hide()

    def contextMenuEvent(self, event):
        """Pop up menu
        :return:
        """
        # create a menu and add action
        contextMenu = QMenu()
        contextMenu.addAction("Add Label", lambda : setattr(self, "label", ItemLabel(self)))
        contextMenu.addAction("Rotate right(E)", lambda : setattr(self, "rotation", self.rotation + 1))
        contextMenu.addAction("Rotate left(Q)", lambda : setattr(self, "rotation", self.rotation - 1))
        contextMenu.addAction("Flip Horizontally", lambda: setattr(self, "flipH", not self.flipH))
        contextMenu.addAction("Flip Vertically", lambda: setattr(self, "flipV", not self.flipV))
        action = contextMenu.exec_(event.screenPos())

    def __getstate__(self):
        return {
            "_classname_": self.__class__.__name__,
            "width": self.width,
            "height": self.height,
            "pos": (self.pos().x(), self.pos().y()),
            "lineGripItems": [(hex(id(i)), i.m_index) for i in self.lineGripItems],
            "label": self.label,
            "rotation": self.rotation,
            "flipstate": self.flipState
        }

    def __setstate__(self, dict):
        self.prepareGeometryChange()
        self.width = dict['width']
        self.height = dict['height']
        self.updateSizeGripItem()


class InflowLine(NodeItem):
    def __init__(self):
        super(InflowLine, self).__init__("svg/Piping/Inflow Line")
        self.grips = [
            [100, 50, "right"]
        ]


class OutflowLine(NodeItem):
    def __init__(self):
        super(OutflowLine, self).__init__("svg/Piping/Outflow Line")
        self.grips = [
            [0, 50, "left"]
        ]


class DuplexPump(NodeItem):
    def __init__(self):
        super(DuplexPump, self).__init__("svg/Pumps/Duplex Pump")
        self.grips = [
            [100, 68.8031698, "right"],
            [0, 88.1365808, "left"]
        ]


class PlungerPump(NodeItem):
    def __init__(self):
        super(PlungerPump, self).__init__("svg/Pumps/Plunger Pump")
        self.grips = [
            [87.0328592, 100, "top"],
            [87.0328592, 0, "bottom"]
        ]


class ProportioningPump(NodeItem):
    def __init__(self):
        super(ProportioningPump, self).__init__("svg/Pumps/Proportioning Pump")
        self.grips = [
            [100, 83.0966226, "right"],
            [0, 83.0966226, "left"]
        ]


class ReciprocatingPump(NodeItem):
    def __init__(self):
        super(ReciprocatingPump, self).__init__("svg/Pumps/Reciprocating Pump")
        self.grips = [
            [100, 78.3969475, "right"],
            [0, 78.3969475, "left"]
        ]


class BlowingEgg(NodeItem):
    def __init__(self):
        super(BlowingEgg, self).__init__("svg/Pumps/Blowing Egg")
        self.grips = [
            [15.2887853, 56.4147177, "top"],
            [84.7112147, 56.4147177, "top"]
        ]


class EjectorVaporService(NodeItem):
    def __init__(self):
        super(EjectorVaporService, self).__init__("svg/Pumps/Ejector(Vapor Service)")
        self.grips = [
            [18, 100, "top"],
            [0, 50, "left"],
            [100, 50, "right"]
        ]


class HandPumpWithDrum(NodeItem):
    def __init__(self):
        super(HandPumpWithDrum, self).__init__("svg/Pumps/Hand Pump with Drum")
        self.grips = [
            [92.8093483, 70.60413752309337, "right"],
            [7.913824600849647, 70.60413752309337, "left"],
            [4.136894788615162, 86.9886362, "left"]
        ]


class CentrifugalCompressor(NodeItem):
    def __init__(self):
        super(CentrifugalCompressor, self).__init__("svg/Compressors/Centrifugal Compressor")
        self.grips = [
            [41.316753407496, 89.824108247573, "top"],
            [62.0517030576456, 79.183192150093, "top"],
            [41.316753407496, 6.447877022097, "bottom"],
            [62.0517030576456, 16.14847772052, "bottom"]
        ]


class EjectorCompressor(NodeItem):
    def __init__(self):
        super(EjectorCompressor, self).__init__("svg/Compressors/Ejector Compressor")
        self.grips = [
            [13.1018813062, 100, "top"],
            [0, 50, "left"],
            [100, 50, "right"]
        ]


class Fan(NodeItem):
    def __init__(self):
        super(Fan, self).__init__("svg/Compressors/Fan")
        self.grips = [
            [50, 79.92762310350343, "top"],
            [0, 79.92762310350343, "left"],
            [100, 79.92762310350343, "right"]
        ]


class PositiveDisplacementCompressor(NodeItem):
    def __init__(self):
        super(PositiveDisplacementCompressor, self).__init__("svg/Compressors/Positive Displacement Compressor")
        self.grips = [
            [50, 100, "top"],
            [21.15509548928236, 30, "left"],
            [79.57853462426666, 30, "right"]
        ]


class ReciprocatingCompressor(NodeItem):
    def __init__(self):
        super(ReciprocatingCompressor, self).__init__("svg/Compressors/Reciprocating Compressor")
        self.grips = [
            [22.85680252121469, 83, "left"],
            [46.81088180183039, 83, "right"]
        ]


class Turbine(NodeItem):
    def __init__(self):
        super(Turbine, self).__init__("svg/Compressors/Turbine")
        self.grips = [
            [18.06209745144267, 79.11931909160472, "top"],
            [45.2091373550176, 91.385325275219, "top"],
            [18.06209745144267, 16.41537491819628, "bottom"],
            [45.2091373550176, 4.5725942986116, "bottom"]
        ]


class OilGasOrPulverizedFuelFurnace(NodeItem):
    def __init__(self):
        super(OilGasOrPulverizedFuelFurnace, self).__init__(
            "svg/Furnaces and Boilers/Oil Gas or Pulverized Fuel Furnace")
        self.grips = [
            [58.27673386073162, 100, "top"],
            [0, 19.692723451106, "left"],
            [17.2777337415748-5, 33.3944873323144, "left", 66.7889746646288],
            [100+5, 33.3944873323144, "right", 66.7889746646288],
            [57.9723659874, 0-10, "bottom", 81.389264491796]
        ]


class SolidFuelFurnace(NodeItem):
    def __init__(self):
        super(SolidFuelFurnace, self).__init__("svg/Furnaces and Boilers/Solid Fuel Furnace")
        self.grips = [
            [50, 100, "top"],
            [0-5, 33.39352642259468, "left", 66.78705284518936],
            [100+5, 33.39352642259468, "right", 66.78705284518936],
            [50, 0-10, "bottom", 100]
        ]


class Exchanger905(NodeItem):
    def __init__(self):
        super(Exchanger905, self).__init__("svg/Heating or Cooling Arrangements/905Exchanger")
        self.grips = [
            [15.85, 13.5, "bottom", 11.21],
            [60.5, 13.5, "bottom", 55.33],
            [15.85, 88.88, "top", 11.21],
            [60.5, 88.88, "top", 55.33]
        ]


class Exchanger(NodeItem):
    def __init__(self):
        super(Exchanger, self).__init__("svg/Heating or Cooling Arrangements/Exchanger")
        self.grips = [
            [100, 31.74474612706027, "right"],
            [100, 62.70549343934227, "right"],
            [33.68240920045628, 100, "top"],
            [33.68240920045628, 0, "bottom"]
        ]


class HeatExchanger(NodeItem):
    def __init__(self):
        super(HeatExchanger, self).__init__("svg/Heating or Cooling Arrangements/Heat Exchanger")
        self.grips = [
            [0, 47.14356681569796, "left"],
            [100, 47.14356681569796, "right"],
            [50.92839727035332, 100, "top"],
            [50.92839727035332, 0, "bottom"]
        ]


class ImmersionCoil(NodeItem):
    def __init__(self):
        super(ImmersionCoil, self).__init__("svg/Heating or Cooling Arrangements/Immersion Coil")
        self.grips = [
            [44.56276981957, 100, "top"],
            [88.232463407718, 100, "top"]
        ]


class HorizontalVessel(NodeItem):
    def __init__(self):
        super(HorizontalVessel, self).__init__("svg/Process Vessels/Horizontal Vessel")
        self.grips = [
            [50, 100+10, "top", 87.08554680344],
            [0, 50, "left"],
            [100, 50, "right"],
            [50, 0-10, "bottom", 87.08554680344]
        ]


class PackedVessel(NodeItem):
    def __init__(self):
        super(PackedVessel, self).__init__("svg/Process Vessels/Packed Vessel")
        self.grips = [
            [50, 100, "top"],
            [0-10, 50, "left", 86.703566201060],
            [100+10, 50, "right", 86.703566201060],
            [50, 0, "bottom"]
        ]


class TraysOrPlates(NodeItem):
    def __init__(self):
        super(TraysOrPlates, self).__init__("svg/Process Vessels/Trays or plates")
        self.grips = [
        ]


class VerticalVessel(NodeItem):
    def __init__(self):
        super(VerticalVessel, self).__init__("svg/Process Vessels/Vertical Vessel")
        self.grips = [
            [50, 100, "top"],
            [0-10, 50, "left", 86.703566201060],
            [100+10, 50, "right", 86.703566201060],
            [50, 0, "bottom"]
        ]


class Separators(NodeItem):
    def __init__(self):
        super(Separators, self).__init__("svg/Separators/Separators for Liquids, Decanter")
        self.grips = [
            [50, 100, "top", 100],
            [0, 50, "left", 100],
            [100, 50, "right", 100],
            [50, 0, "bottom", 100]
        ]


class FixedRoofTank(NodeItem):
    def __init__(self):
        super(FixedRoofTank, self).__init__("svg/Storage Vessels Tanks/Fixed Roof Tank")
        self.grips = [
            [50, 100, "top"],
            [0-6, 50, "left", 100],
            [100+7, 50, "right", 100],
            [50, 0-10, "bottom", 100]
        ]


class FloatingRoofTank(NodeItem):
    def __init__(self):
        super(FloatingRoofTank, self).__init__("svg/Storage Vessels Tanks/Floating Roof Tank")
        self.grips = [
            [0-7, 50, "left", 100],
            [100+7, 50, "right", 100],
            [50, 0-10, "bottom", 100]
        ]


class SeparatorsForLiquidsDecanter(NodeItem):
    def __init__(self):
        super(SeparatorsForLiquidsDecanter, self).__init__("svg/Separators/Separators for Liquids, Decanter")
        self.grips = [
            [50, 100+10, "top", 100],
            [0-10, 50, "left", 100],
            [100+10, 50, "right", 100],
            [50, 0-10, "bottom", 100]
        ]

class GateValve(NodeItem):
    def __init__(self):
        super(GateValve, self).__init__("svg/Valves/Gate Valve")
        self.grips = [
            [0, 50, "left"],
            [100, 50, "right"]
        ]

class CentrifugalPump(NodeItem):
    def __init__(self):
        super(CentrifugalPump, self).__init__("svg/Pumps/Centrifugal Pump")
        self.grips = [
            [100, 97.2, "right"],
            [0, 58.78, "left"]
        ]


class OneCellFiredHeaterFurnace(NodeItem):
    def __init__(self):
        super(OneCellFiredHeaterFurnace, self).__init__("svg/Furnaces and Boilers/One Cell Fired Heater, Furnace")
        self.grips = [
            [50, 100, "top"],
            [0-7, 25, "left", 50],
            [25, 87.5, "left", 25],
            [100+7, 25, "right", 50],
            [75, 87.5, "right", 25],
            [50, 0-10, "bottom", 100]
        ]


class TwoCellFiredHeaterFurnace(NodeItem):
    def __init__(self):
        super(TwoCellFiredHeaterFurnace, self).__init__("svg/Furnaces and Boilers/Two Cell Fired Heater, Furnace")
        self.grips = [
            [50, 100, "top"],
            [0-5, 33.33, "left", 66.66],
            [33.33, 91.66, "left", 16.66],
            [100+5, 33.33, "right", 66.66],
            [66.66, 91.66, "right", 16.66],
            [16.67, 0-10, "bottom", 33.33],
            [83.33, 0-10, "bottom", 33.33]
        ]


class ReducerExpander(NodeItem):
    def __init__(self):
        super(ReducerExpander, self).__init__("svg/Fittings/Reducer, Expander")
        self.grips = [
            [100, 50, "right"],
            [0, 50, "left"]
        ]


class Filter(NodeItem):
    def __init__(self):
        super(Filter, self).__init__("svg/Fittings/Filter")
        self.grips = [
            [0, 50, "left"],
            [100, 50, "right"]
        ]


class ContinuousDryer(NodeItem):
    def __init__(self):
        super(ContinuousDryer, self).__init__("svg/Dryers/Continuous Dryer")
        self.grips = [
            [8.13, 35.2, "top"],
            [98.9, 28, "bottom"],
            [50, 100+10, "top", 60.13]
        ]


class JawCrusher(NodeItem):
    def __init__(self):
        super(JawCrusher, self).__init__("svg/Size Reduction Equipements/Jaw Crusher")
        self.grips = [
            [79.65, 100, "top"],
            [0, 0, "bottom"]
        ]


class RollerCrusher(NodeItem):
    def __init__(self):
        super(RollerCrusher, self).__init__("svg/Size Reduction Equipements/Roller Crusher")
        self.grips = [
            [50, 100, "top"],
            [50, 0, "bottom"]
        ]


class GeneralSymbol(NodeItem):
    def __init__(self):
        super(GeneralSymbol, self).__init__("svg/Feeders/General Symbol")
        self.grips = [
            [20, 100, "top"],
            [80, 0, "bottom"]
        ]