Python 中的 matplotlib . lines . vertexselector 类
原文:https://www . geeksforgeeks . org/matplotlib-lines-vertexsele-class-in-python/
matplotlib . lines . vertexselector类属于 matplotlib.lines 模块。matplotlib.lines 模块包含了所有的 2D 线类，可以用各种各样的线条样式、标记和颜色来绘制。matplotlib . lines . vertexselector类用于管理回调，这些回调维护 matplotlib.lines.Line2D 的选定顶点列表。process_selected()函数被选择的派生类覆盖。
语法:class matplotlib . lines . vertexselector(line) 参数:
- 线:这些代表为绘图定义的线。
该类方法:
- onpick(self，event): 当使用此方法拾取线时，所选的索引集会更新。
- process_selected(self，ind，xs，ys): 默认情况下，它执行 process_selected()方法的“不执行任何操作”。“ind”代表所选顶点的索引，而“xs”和“ys”是所选顶点的坐标。
示例#1:
Python 3
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.lines as lines
# class for highlighting selected area
class Highlighter(lines.VertexSelector):
# constructor for the highlighter class
def __init__(self, line, fmt ='ro', **kwargs):
lines.VertexSelector.__init__(self, line)
self.markers, = self.axes.plot([], [], fmt, **kwargs)
# helper function process selected area and plot graph accordingly
def process_selected(self, ind, xs, ys):
self.markers.set_data(xs, ys)
self.canvas.draw()
figure, ax = plt.subplots()
x_axis, y_axis = np.random.rand(2, 30)
line, = ax.plot(x_axis, y_axis, 'bs-', picker = 5)
selector = Highlighter(line)
plt.show()
输出:
例 2:
Python 3
import matplotlib.pyplot as plt
import matplotlib.lines as lines
from matplotlib.collections import PathCollection
lines.VertexSelector
# class for plot clicked area
class dragged_lines:
# constructor for the dragged_lines class
def __init__(self, ax):
self.ax = ax
self.c = ax.get_figure().canvas
self.line = lines.Line2D(x, y, picker = 5, marker ='o',
markerfacecolor ='g', color ='y')
self.ax.add_line(self.line)
self.c.draw_idle()
self.sid = self.c.mpl_connect('pick_event', self.lineclicker)
def lineclicker(self, event):
if event.artist:
print("line selected ", event.artist)
self.follower = self.c.mpl_connect("motion_notify_event",
self.mouse_follower)
self.releaser = self.c.mpl_connect("button_press_event",
self.release_after_click)
def mouse_follower(self, event):
self.line.set_data([event.xdata, event.ydata])
self.c.draw_idle()
def release_after_click(self, event):
data = self.line.get_data()
print(data)
self.c.mpl_disconnect(self.releaser)
self.c.mpl_disconnect(self.follower)
figure = plt.figure()
axes = figure.add_subplot(111)
x_axis, y_axis = [2, 4, 5, 7], [8, 6, 12, 9]
axes.plot(x_axis, y_axis)
Vline = dragged_lines(axes)
plt.show()
输出:
版权属于：月萌API www.moonapi.com，转载请注明出处
