matplotlib.lines.VertexSelector

class matplotlib.lines.VertexSelector(line)

Bases: object

Manage the callbacks to maintain a list of selected vertices for Line2D. Derived classes should override process_selected() to do something with the picks.

Here is an example which highlights the selected verts with red circles:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.lines as lines

class HighlightSelected(lines.VertexSelector):
    def __init__(self, line, fmt='ro', **kwargs):
        lines.VertexSelector.__init__(self, line)
        self.markers, = self.axes.plot([], [], fmt, **kwargs)

    def process_selected(self, ind, xs, ys):
        self.markers.set_data(xs, ys)
        self.canvas.draw()

fig, ax = plt.subplots()
x, y = np.random.rand(2, 30)
line, = ax.plot(x, y, 'bs-', picker=5)

selector = HighlightSelected(line)
plt.show()

Initialize the class with a Line2D instance. The line should already be added to some matplotlib.axes.Axes instance and should have the picker property set.

onpick(event)

When the line is picked, update the set of selected indices.

process_selected(ind, xs, ys)

Default "do nothing" implementation of the process_selected() method.

ind are the indices of the selected vertices. xs and ys are the coordinates of the selected vertices.