Python matplotlib.lines.VertexSelector用法及代码示例

matplotlib.lines.VertexSelector类属于matplotlib.lines模块。 matplotlib.lines模块包含所有2D线类，可以使用各种线型，标记和颜色来绘制。 matplotlib.lines.VertexSelector类用于管理回调，该回调维护matplotlib.lines.Line2D的选定顶点的列表。这process_selected()函数被派生类的派生类覆盖。

用法： class matplotlib.lines.VertexSelector(line)

参数：

lines:这些代表为绘图定义的线。

Methods of the class:

onpick(事件)：使用此方法拾取线时，所选索引集将更新。
process_selected(self，ind，xs，ys)：默认情况下，它执行process_selected()方法的“do nothing”。 ‘ind’代表选定顶点的索引，而‘xs’和‘ys’是选定顶点的坐标。

范例1：

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：

范例2：

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：

相关用法

注：本文由纯净天空筛选整理自RajuKumar19大神的英文原创作品 matplotlib.lines.VertexSelector class in Python。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。