Limit the number of shapes that can be drawn on a figure

ray26 · October 28, 2022, 10:24pm

Is there a way to set the maximum number of shapes that can be drawn on a figure? I want the user to not be able to draw anymore shapes on a figure after the first shape is drawn on the figure, as shown on the screenshot below.

AIMPED · October 28, 2022, 10:31pm

Hi @ray26 ,

you could check the length of the list which contains the shapes

github.com

AIMPED/plotly_dash/blob/master/plotlyDash_annotations.py#L99


      
          if not clickData:
              raise PreventUpdate
          else:
              points = clickData.get('points')[0]
              x = points.get('x')
              y = points.get('y')
          
          
    # create new shape
              new_shape = create_shape(x=x, y=y, size=5)
          
          
    # get existing shapes
              shapes = graph_figure['layout'].get('shapes')
              if not shapes:
                  shapes = []
              shapes.extend(new_shape)
          
          
    # update figure layout
              graph_figure['layout'].update(shapes=shapes)
          return graph_figure

ray26 · November 1, 2022, 9:07pm

Hi @AIMPED thanks a lot!