import dearpygui.dearpygui as dpg

dpg.create_context()

def print_val(sender):
    print(dpg.get_value(sender))

with dpg.window(label="Tutorial", width=400, height=400):
    with dpg.plot(label="Drag Lines/Points", height=-1, width=-1):
        dpg.add_plot_legend()
        dpg.add_plot_axis(dpg.mvXAxis, label="x")
        dpg.set_axis_limits(dpg.last_item(), -5, 5)
        dpg.add_plot_axis(dpg.mvYAxis, label="y")
        dpg.set_axis_limits(dpg.last_item(), -5, 5)

        # drag lines/points belong to the plot NOT axis
        dpg.add_drag_line(label="dline1", color=[255, 0, 0, 255], default_value=2.0, callback=print_val)
        dpg.add_drag_line(label="dline2", color=[255, 255, 0, 255], vertical=False, default_value=-2, callback=print_val)
        dpg.add_drag_point(label="dpoint1", color=[255, 0, 255, 255], default_value=(1.0, 1.0), callback=print_val)
        dpg.add_drag_point(label="dpoint2", color=[255, 0, 255, 255], default_value=(-1.0, 1.0), callback=print_val)

dpg.create_viewport(title='Custom Title', width=800, height=600)
dpg.setup_dearpygui()
dpg.show_viewport()
dpg.start_dearpygui()
dpg.destroy_context()