def paintEvent(self, event):

        super(CircularBrush, self).paintEvent(event)

        # draw brush
        if hasattr(self, 'brush_state') and self.brush_state.draw:
            painter = QPainter()
            shapes = self.create_brush_shape()
            for shape in shapes:
                shape = [QPointF(point[0], point[1]) for point in shape]

                path = QPainterPath()
                start_pos = shape.pop(0)
                path.moveTo(start_pos)
                [path.lineTo(point) for point in shape]

                painter.setRenderHint(painter.Antialiasing)
                #  painter.setRenderHint(painter.HighQualityAnti)
                painter.begin(self)

                painter.setPen(QPen(Qt.red, 1))
                painter.drawPath(path)

            painter.end() 

def updateIndicatorPos(self, eventPos):
		"""
		move indicator cursor to correct position under mouse
		"""
		rect = self.getImageDims()
		gridSize = 	rect.width() / self.gridSize.width()
		latentSize = self.latentSize * gridSize
		centerOffset = latentSize // 2

		scenePos = QGraphicsView.mapToScene(self, eventPos)
		scenePos -= QPointF(centerOffset, centerOffset) #center latentIndicator around mouse

		roundPos = QPoint(int(gridSize * round(scenePos.x()/gridSize)), int(gridSize * round(scenePos.y()/gridSize)))

		roundPos.setX(int(max(-centerOffset, min(roundPos.x(), rect.width()  - ( latentSize - centerOffset )))))
		roundPos.setY(int(max(-centerOffset, min(roundPos.y(), rect.height() - ( latentSize - centerOffset )))))
		self._latentIndicator.setPos(roundPos) 

def makeContourPolygon(self, coordinates):
        """Add airfoil points as GraphicsItem to the scene"""

        # instantiate a graphics item
        contour = gic.GraphicsCollection()
        # make it polygon type and populate its points
        points = [QtCore.QPointF(x, y) for x, y in zip(*coordinates)]
        contour.Polygon(QtGui.QPolygonF(points), self.name)
        # set its properties
        contour.pen.setColor(self.pencolor)
        contour.pen.setWidthF(self.penwidth)
        # no pen thickness change when zoomed
        contour.pen.setCosmetic(True)
        contour.brush.setColor(self.brushcolor)

        self.contourPolygon = GraphicsItem.GraphicsItem(contour) 

def __init__(self, edge, arrow_location="end", arrow_direction='down', parent=None):
        super().__init__(parent)

        self.edge = edge
        self.rect = None
        self._start = QPointF(*self.edge.coordinates[0])
        self.coords = [self.create_point(c) for c in self.edge.coordinates]
        self.end = self.coords[-1]
        self.start = self.coords[0]

        self.color = EDGE_COLORS.get(self.edge.sort, EDGE_COLORS[EdgeSort.DIRECT_JUMP])
        self.arrow = self._make_arrow(arrow_location, arrow_direction)
        self.style = EDGE_STYLES.get(self.edge.sort, EDGE_STYLES[EdgeSort.DIRECT_JUMP])
        self.path = self._make_path()

        self._hovered = False

        self.setAcceptHoverEvents(True) 

def _make_arrow(self, location, direction):
        if location == "start":
            coord = self.start
        else:
            coord = self.end

        if direction == "down":
            return [QPointF(coord.x() - 3, coord.y()), QPointF(coord.x() + 3, coord.y()),
                     QPointF(coord.x(), coord.y() + 6)]
        elif direction == "right":
            return [QPointF(coord.x(), coord.y() - 3), QPointF(coord.x(), coord.y() + 3),
                 QPointF(coord.x() + 6, coord.y())]
        elif direction == "left":
            return [QPointF(coord.x(), coord.y() - 3), QPointF(coord.x(), coord.y() + 3),
                    QPointF(coord.x() - 6, coord.y())]
        else:
            raise NotImplementedError("Direction %s is not supported yet." % direction) 

def move(self, rects, cursor):
        x = cursor.x() - self.reference_x
        y = cursor.y() - self.reference_y
        if self.snap is not None:
            x, y = snap(x, y, self.snap)
        width = self.rect.width()
        height = self.rect.height()
        self.rect.setTopLeft(QtCore.QPointF(x, y))
        self.rect.setWidth(width)
        self.rect.setHeight(height)
        self.apply_relative_transformation(rects) 

def updateIndicatorSize(self, stroke=3, offset=2, crossSize=10):
		"""
		draw a box and crosshair under mouse cursor as rectangle of size latentSize
		"""
		multiplier = 1 #TODO optional: scale indicator with zoom level

		stroke *= multiplier
		offset *= multiplier
		crossSize *= multiplier

		halfStroke = stroke / 2
		rect = self.getImageDims()
		latentSize = self.latentSize * rect.width() / self.gridSize.width()
		halfSize = latentSize / 2
		crossSize = min(crossSize, int(halfSize - 3))

		pixmap = QPixmap(QSize(int(latentSize + stroke + offset), int(latentSize + stroke + offset)))
		#fill rectangle with transparent color
		pixmap.fill(QColor(0,0,0,0)) #transparent

		painter = QPainter(pixmap)
		r = QRectF(QPoint(), QSizeF(latentSize, latentSize))
		r.adjust(offset+halfStroke, offset+halfStroke, -halfStroke, -halfStroke)
		#draw shadow under rectangle
		pen = QPen(QColor(50, 50, 50, 100), stroke) #shadow
		painter.setPen(pen)
		painter.drawRect(r)
		if crossSize > 4:
			painter.drawLine(QPointF(offset+halfSize, offset+halfSize-crossSize), QPointF(offset+halfSize, offset+halfSize+crossSize))
			painter.drawLine(QPointF(offset+halfSize-crossSize, offset+halfSize), QPointF(offset+halfSize+crossSize, offset+halfSize))
		r.adjust(-offset, -offset, -offset, -offset)
		pen = QPen(QColor(styleColor[0], styleColor[1], styleColor[2], 200), stroke)
		painter.setPen(pen)
		painter.drawRect(r)
		if crossSize > 4:
			painter.drawLine(QPointF(halfSize, halfSize - crossSize), QPointF(halfSize, halfSize + crossSize))
			painter.drawLine(QPointF(halfSize - crossSize, halfSize), QPointF(halfSize + crossSize, halfSize))
		painter.end()

		self._latentIndicator.setPixmap(pixmap) 

def roundToGlobalGridCoords(self, pos):
		"""
		return a global coordinate for a latent grid position
		"""
		roundedGridPos = self.getGridCoords(pos)
		imageRect = self.getImageDims()
		pixelPos = QPointF(roundedGridPos.x() * imageRect.width() / self.gridSize.width(), roundedGridPos.y() * imageRect.height() / self.gridSize.height())
		return QGraphicsView.mapToGlobal(self, QGraphicsView.mapFromScene(self, pixelPos)) 

def Line(self, x1, y1, x2, y2):
        eps = 0.01
        p1 = QtCore.QPointF(x1-eps, y1-eps)
        p2 = QtCore.QPointF(x2+eps, y2+eps)
        self.rect = QtCore.QRectF(p1, p2)
        self.shape.addRect(self.rect)
        self.method = 'drawLine'
        self.args = [x1, y1, x2, y2] 

def fitAirfoilInView(self):

        if len(self.parent.airfoils) == 0:
            return

        # get bounding rect in scene coordinates
        item = self.parent.airfoil.contourPolygon
        rectf = item.boundingRect()
        rf = copy.deepcopy(rectf)

        center = rf.center()
        # make 4% smaller than width of graphicsview
        w = 1.04 * rf.width()
        h = 1.04 * rf.height()
        # do not use setWidhtF and setHeightF here!!!
        rf.setWidth(w)
        rf.setHeight(h)

        # shift center of rectf
        cx = center.x()
        cy = center.y()
        rf.moveCenter(QtCore.QPointF(cx, cy))

        self.parent.view.fitInView(rf,
                                   aspectRadioMode=QtCore.Qt.KeepAspectRatio)

        # it is IMPORTANT that this is called after fitInView
        # adjust airfoil marker size to MARKERSIZE setting
        self.parent.view.adjustMarkerSize()

        # cache view to be able to keep it during resize
        self.parent.view.getSceneFromView() 

def create_point(self, stuff):
        return QPointF(*stuff) - self._start 

def _get_distance(pt0: QPointF, pt1: QPointF) -> float:
        d = (pt1.x() - pt0.x()) ** 2 + (pt1.y() - pt0.y()) ** 2
        return math.sqrt(d) 

def _get_line_end(self, i: int) -> QPointF:
        pt0 = self.coords[i]
        pt1 = self.coords[i + 1] if i + 1 < len(self.coords) else self.coords[0]
        rat = self._radius / self._get_distance(pt0, pt1)
        if rat > 0.5:
            rat = 0.5
        return QPointF(rat * pt0.x() + (1.0 - rat) * pt1.x(), rat * pt0.y() + (1.0 - rat) * pt1.y()) 

def _paint_insn_indicators(self, **kwargs):

        scene = self.view.scene()  # type: QGraphicsScene
        for item in self._insn_indicators:
            scene.removeItem(item)
        self._insn_indicators.clear()

        for selected_insn_addr in self.disasm_view.infodock.selected_insns:
            pos = self._get_pos_from_addr(selected_insn_addr)
            if pos is None:
                continue

            pos -= 1  # this is the top-left x coordinate of our arrow body (the rectangle)

            pen = QPen(Qt.yellow)
            brush = QBrush(Qt.yellow)
            rect = QRectF(pos, 0, 2, 5)
            # rectangle
            item = scene.addRect(rect, pen, brush)
            self._insn_indicators.append(item)
            # triangle
            triangle = QPolygonF()
            triangle.append(QPointF(pos - 1, 5))
            triangle.append(QPointF(pos + 3, 5))
            triangle.append(QPointF(pos + 1, 7))
            triangle.append(QPointF(pos - 1, 5))
            item = scene.addPolygon(triangle, pen, brush)
            self._insn_indicators.append(item) 

def request_relayout(self):

        node_coords, edges = self._layout_graph()

        self._edges = edges

        categorize_edges(self.disasm, edges)

        if not node_coords:
            print("Failed to get node_coords")
            return

        # layout nodes
        for block in self.blocks:
            x, y = node_coords[block.addr]
            block.setPos(x, y)

        scene = self.scene()

        # remove exiting arrows
        for arrow in self._arrows:
            scene.removeItem(arrow)
        self._arrows.clear()

        for edge in self._edges:
            arrow = QDisasmGraphArrow(edge, self.disasm_view, self.infodock)
            self._arrows.append(arrow)
            scene.addItem(arrow)
            arrow.setPos(QPointF(*edge.coordinates[0])) 

def _initial_position(self):
        entry_block_rect = self.entry_block.mapRectToScene(self.entry_block.boundingRect())
        viewport_height = self.viewport().rect().height()
        min_rect = self.scene().itemsBoundingRect()
        if min_rect.height() < (viewport_height // 1.5):
            return min_rect.center()
        else:
            focus_point = (entry_block_rect.center().x(), entry_block_rect.top() + (viewport_height // 4))
            return QPointF(*focus_point) 

def _draw_edges(self, painter, topleft_point, bottomright_point):
        for edge in self._edges:
            edge_coords = edge.coordinates

            color = QColor(0x70, 0x70, 0x70)
            pen = QPen(color)
            pen.setWidth(1.5)
            painter.setPen(pen)

            for from_, to_ in zip(edge_coords, edge_coords[1:]):
                start_point = QPointF(*from_)
                end_point = QPointF(*to_)
                # optimization: don't draw edges that are outside of the current scope
                if (start_point.x() > bottomright_point.x() or start_point.y() > bottomright_point.y()) and \
                        (end_point.x() > bottomright_point.x() or end_point.y() > bottomright_point.y()):
                    continue
                elif (start_point.x() < topleft_point.x() or start_point.y() < topleft_point.y()) and \
                        (end_point.x() < topleft_point.x() or end_point.y() < topleft_point.y()):
                    continue
                painter.drawPolyline((start_point, end_point))

            # arrow
            # end_point = self.mapToScene(*edges[-1])
            end_point = (edge_coords[-1][0], edge_coords[-1][1])
            arrow = [QPointF(end_point[0] - 3, end_point[1]), QPointF(end_point[0] + 3, end_point[1]),
                     QPointF(end_point[0], end_point[1] + 6)]
            brush = QBrush(color)
            painter.setBrush(brush)
            painter.drawPolygon(arrow) 

def tileForCoordinate(lat, lng, zoom):
    zn = float(1 << zoom)
    tx = float(lng + 180.0) / 360.0
    ty = (1.0 - math.log(math.tan(lat * math.pi / 180.0) +
                         1.0 / math.cos(lat * math.pi / 180.0)) / math.pi) / 2.0

    return QPointF(tx * zn, ty * zn) 

def pan(self, delta):
        dx = QPointF(delta) / float(TDIM)
        center = tileForCoordinate(self.latitude, self.longitude, self.zoom) - dx
        self.latitude = latitudeFromTile(center.y(), self.zoom)
        self.longitude = longitudeFromTile(center.x(), self.zoom)
        self.invalidate()

    # slots 

def paint(self, painter, option, widget=None):
        if self.start_node.collidesWithItem(self.end_node):
            return

        start_node = self.start_node
        end_node = self.end_node
        color = self.arrow_color
        pen = self.pen()
        pen.setColor(self.arrow_color)
        arrow_size = 20.0
        painter.setPen(pen)
        painter.setBrush(self.arrow_color)

        end_rectangle = end_node.sceneBoundingRect()
        start_center = start_node.sceneBoundingRect().center()
        end_center = end_rectangle.center()
        center_line = QtCore.QLineF(start_center, end_center)
        end_polygon = QtGui.QPolygonF(end_rectangle)
        p1 = end_polygon.at(0)

        intersect_point = QtCore.QPointF()
        for p2 in end_polygon:
            poly_line = QtCore.QLineF(p1, p2)
            intersect_type, intersect_point = poly_line.intersect(center_line)
            if intersect_type == QtCore.QLineF.BoundedIntersection:
                break
            p1 = p2

        self.setLine(QtCore.QLineF(intersect_point, start_center))
        line = self.line()

        angle = math.acos(line.dx() / line.length())
        if line.dy() >= 0:
            angle = (math.pi * 2.0) - angle

        arrow_p1 = line.p1() + QtCore.QPointF(
            math.sin(angle + math.pi / 3.0) * arrow_size,
            math.cos(angle + math.pi / 3.0) * arrow_size
        )
        arrow_p2 = line.p1() + QtCore.QPointF(
            math.sin(angle + math.pi - math.pi / 3.0) * arrow_size,
            math.cos(angle + math.pi - math.pi / 3.0) * arrow_size
        )

        self.arrow_head.clear()
        for point in [line.p1(), arrow_p1, arrow_p2]:
            self.arrow_head.append(point)

        painter.drawLine(line)
        painter.drawPolygon(self.arrow_head)
        if self.isSelected():
            painter.setPen(QtGui.QPen(color, 1, QtCore.Qt.DashLine))
            line = QtCore.QLineF(line)
            line.translate(0, 4.0)
            painter.drawLine(line)
            line.translate(0, -8.0)
            painter.drawLine(line) 

def drawMesh(self, airfoil):
        """Add the mesh as ItemGroup to the scene

        Args:
            airfoil (TYPE): object containing all airfoil properties and data
        """

        # toggle spline points
        self.mainwindow.centralwidget.cb3.click()

        # delete old mesh if existing
        if hasattr(airfoil, 'mesh'):
            logger.debug('MESH item type: {}'.format(type(airfoil.mesh)))
            self.mainwindow.scene.removeItem(airfoil.mesh)

        mesh = list()

        for block in self.blocks:
            for lines in [block.getULines(),
                          block.getVLines()]:
                for line in lines:

                    # instantiate a graphics item
                    contour = gic.GraphicsCollection()
                    # make it polygon type and populate its points
                    points = [QtCore.QPointF(x, y) for x, y in line]
                    contour.Polyline(QtGui.QPolygonF(points), '')
                    # set its properties
                    contour.pen.setColor(QtGui.QColor(0, 0, 0, 255))
                    contour.pen.setWidthF(0.8)
                    contour.pen.setCosmetic(True)
                    contour.brush.setStyle(QtCore.Qt.NoBrush)

                    # add contour as a GraphicsItem to the scene
                    # these are the objects which are drawn in the GraphicsView
                    meshline = GraphicsItem.GraphicsItem(contour)
                    mesh.append(meshline)

        airfoil.mesh = self.mainwindow.scene.createItemGroup(mesh)

        # activate viewing options if mesh is created and displayed
        self.mainwindow.centralwidget.cb6.setChecked(True)
        self.mainwindow.centralwidget.cb6.setEnabled(True) 

def makeContourSpline(self):
        """Add splined and refined airfoil points as GraphicsItem to
        the scene
        """
        self.pencolor = QtGui.QColor(80, 80, 220, 255)
        self.penwidth = 3.5

        # instantiate a graphics item
        splinecontour = gic.GraphicsCollection()
        # make it polygon type and populate its points
        points = [QtCore.QPointF(x, y) for x, y in zip(*self.spline_data[0])]
        splinecontour.Polygon(QtGui.QPolygonF(points), self.name)
        # set its properties
        splinecontour.pen.setColor(self.pencolor)
        splinecontour.pen.setWidthF(self.penwidth)
        # no pen thickness change when zoomed
        splinecontour.pen.setCosmetic(True)
        splinecontour.brush.setColor(self.brushcolor)
        # add the pline polygon without filling
        splinecontour.brush.setStyle(QtCore.Qt.NoBrush)

        # remove items from iterated uses of spline/refine and trailing edge
        if hasattr(self, 'contourSpline'):
            self.mainwindow.scene.removeItem(self.contourSpline)
        self.contourSpline = GraphicsItem.GraphicsItem(splinecontour)
        self.mainwindow.scene.addItem(self.contourSpline)

        # remove items from iterated uses of spline/refine and trailing edge
        if hasattr(self, 'splineMarkersGroup'):
            self.mainwindow.scene.removeItem(self.splineMarkersGroup)
        self.makeSplineMarkers()
        self.splineMarkersGroup = self.mainwindow.scene. \
            createItemGroup(self.splineMarkers)

        self.mainwindow.airfoil.contourSpline.brush. \
            setStyle(QtCore.Qt.SolidPattern)
        color = QtGui.QColor()
        color.setNamedColor('#7c8696')
        self.contourSpline.brush.setColor(color)
        self.polygonMarkersGroup.setZValue(100)
        self.chord.setZValue(99)

        # switch off raw contour and toogle corresponding checkbox
        if self.polygonMarkersGroup.isVisible():
            self.mainwindow.centralwidget.cb2.click()

        # activate ckeck boxes for contour points and chord in viewing options
        self.mainwindow.centralwidget.cb3.setChecked(True)
        self.mainwindow.centralwidget.cb3.setEnabled(True)
        self.mainwindow.centralwidget.cb4.setChecked(True)
        self.mainwindow.centralwidget.cb4.setEnabled(True)

        self.contourPolygon.brush.setStyle(QtCore.Qt.NoBrush)
        self.contourPolygon.pen.setStyle(QtCore.Qt.NoPen)
        self.mainwindow.view.adjustMarkerSize() 

def request_relayout(self):
        self._reset_scene()
        if self.graph is None:
            return

        # remove all arrows
        self._arrows.clear()
        self._arrows_by_src.clear()
        self._arrows_by_dst.clear()

        # remove all nodes
        self.blocks.clear()

        node_sizes = {}
        for node in self.graph.nodes():
            self.blocks.add(node)
            node_sizes[node] = (node.width, node.height)
        gl = TreeGraphLayouter(self.graph, node_sizes)

        self._edges = gl.edges

        min_x, max_x, min_y, max_y = 0, 0, 0, 0

        scene = self.scene()
        for node, (x, y) in gl.node_coordinates.items():
            scene.addItem(node)
            node.setPos(x, y)
            min_x = min(min_x, node.x())
            max_x = max(max_x, node.x() + node.width)
            min_y = min(min_y, node.y())
            max_y = max(max_y, node.y() + node.height)

        # draw edges
        for edge in self._edges:
            arrow = QDepGraphArrow(self._dep_view, edge, arrow_location="start", arrow_direction="left")
            self._arrows.append(arrow)
            self._arrows_by_src[edge.src].append(arrow)
            self._arrows_by_dst[edge.dst].append(arrow)
            scene.addItem(arrow)
            arrow.setPos(QPointF(*edge.coordinates[0]))

        min_x -= self.LEFT_PADDING
        max_x += self.LEFT_PADDING
        min_y -= self.TOP_PADDING
        max_y += self.TOP_PADDING

        self._reset_view() 

def __init__(self, parent, api_obj, diagramScene):
        """

        :param parent:
        :param api_obj:
        """
        super(ShuntGraphicItem, self).__init__(parent)

        self.w = 15.0
        self.h = 30.0

        self.parent = parent

        self.api_object = api_obj

        self.diagramScene = diagramScene

        self.width = 4

        if self.api_object is not None:
            if self.api_object.active:
                self.style = ACTIVE['style']
                self.color = ACTIVE['color']
            else:
                self.style = DEACTIVATED['style']
                self.color = DEACTIVATED['color']
        else:
            self.style = OTHER['style']
            self.color = OTHER['color']

        pen = QPen(self.color, self.width, self.style)

        # Properties of the container:
        self.setFlags(self.ItemIsSelectable | self.ItemIsMovable)
        # self.setCursor(QCursor(Qt.PointingHandCursor))

        # line to tie this object with the original bus (the parent)
        self.nexus = QtWidgets.QGraphicsLineItem()
        self.nexus.setPen(QPen(self.color, self.width, self.style))
        parent.scene().addItem(self.nexus)

        self.lines = list()
        self.lines.append(QLineF(QPointF(self.w / 2, 0), QPointF(self.w / 2, self.h * 0.4)))
        self.lines.append(QLineF(QPointF(0, self.h * 0.4), QPointF(self.w, self.h * 0.4)))
        self.lines.append(QLineF(QPointF(0, self.h * 0.6), QPointF(self.w, self.h * 0.6)))
        self.lines.append(QLineF(QPointF(self.w / 2, self.h * 0.6), QPointF(self.w / 2, self.h)))
        self.lines.append(QLineF(QPointF(0, self.h * 1), QPointF(self.w, self.h * 1)))
        self.lines.append(QLineF(QPointF(self.w * 0.15, self.h * 1.1), QPointF(self.w * 0.85, self.h * 1.1)))
        self.lines.append(QLineF(QPointF(self.w * 0.3, self.h * 1.2), QPointF(self.w * 0.7, self.h * 1.2)))
        for l in self.lines:
            l1 = QLine(self)
            l1.setLine(l)
            l1.setPen(pen)
            self.addToGroup(l1)

        self.setPos(self.parent.x(), self.parent.y() + 100)
        self.update_line(self.pos())