使用点击回调更新点¶

import plotly.graph_objects as go

import numpy as np
np.random.seed(1)

x = np.random.rand(100)
y = np.random.rand(100)

f = go.FigureWidget([go.Scatter(x=x, y=y, mode='markers')])

scatter = f.data[0]
colors = ['#a3a7e4'] * 100
scatter.marker.color = colors
scatter.marker.size = [10] * 100
f.layout.hovermode = 'closest'


# create our callback function
def update_point(trace, points, selector):
    c = list(scatter.marker.color)
    s = list(scatter.marker.size)
    for i in points.point_inds:
        c[i] = '#bae2be'
        s[i] = 20
        with f.batch_update():
            scatter.marker.color = c
            scatter.marker.size = s


scatter.on_click(update_point)

f

https://media.githubusercontent.com/media/xinet-collections/test-dastsets/main/tests/figurewidget-click-event.gif

参考¶

import plotly.graph_objects as go
f = go.FigureWidget([go.Scatter()])
help(f.data[0].on_click)

Help on method on_click in module plotly.basedatatypes:

on_click(callback, append=False) method of plotly.graph_objs._scatter.Scatter instance
    Register function to be called when the user clicks on one or more
    points in this trace.
    
    Note: Callbacks will only be triggered when the trace belongs to a
    instance of plotly.graph_objs.FigureWidget and it is displayed in an
    ipywidget context. Callbacks will not be triggered on figures
    that are displayed using plot/iplot.
    
    Parameters
    ----------
    callback
        Callable function that accepts 3 arguments
    
        - this trace
        - plotly.callbacks.Points object
        - plotly.callbacks.InputDeviceState object
    
    append : bool
        If False (the default), this callback replaces any previously
        defined on_click callbacks for this trace. If True,
        this callback is appended to the list of any previously defined
        callbacks.
    
    Returns
    -------
    None
    
    Examples
    --------
    
    >>> import plotly.graph_objects as go
    >>> from plotly.callbacks import Points, InputDeviceState
    >>> points, state = Points(), InputDeviceState()
    
    >>> def click_fn(trace, points, state):
    ...     inds = points.point_inds
    ...     # Do something
    
    >>> trace = go.Scatter(x=[1, 2], y=[3, 0])
    >>> trace.on_click(click_fn)
    
    Note: The creation of the `points` and `state` objects is optional,
    it's simply a convenience to help the text editor perform completion
    on the arguments inside `click_fn`