def _init_canvas(self, parent):
        layout = QtWidgets.QHBoxLayout()
        parent.addLayout(layout)
        self.sagittal_canvas = widgets.SagittalCanvas(self, plot_points=True, horizontal_nav=True)
        self.sagittal_canvas.title(self.params.subtitle)
        layout.addWidget(self.sagittal_canvas)

        self.axial_canvas = widgets.AxialCanvas(self, plot_points=True, crosshair=True)
        self.axial_canvas.plot_points()
        layout.addWidget(self.axial_canvas)

        self.axial_canvas.point_selected_signal.connect(self.on_select_point)
        self.sagittal_canvas.point_selected_signal.connect(self.on_select_slice)
    def _init_canvas(self, parent):
        layout = QtGui.QHBoxLayout()
        self.sagittal_canvas = widgets.SagittalCanvas(self, plot_points=True, plot_position=True)
        layout.addWidget(self.sagittal_canvas)

        self.axial_canvas = widgets.AxialCanvas(self, crosshair=True)
        self.axial_canvas.plot_points()
        layout.addWidget(self.axial_canvas)

        self.axial_canvas.point_selected_signal.connect(self.select_point)
        self.sagittal_canvas.point_selected_signal.connect(self.on_select_slice)

        parent.addLayout(layout)