隐藏Matplotlib Plot中的线而不重新绘制它们

Question

我有一个关于matplotlib和"隐藏"lineplots的新问题。

我有一个wxFrame，它有一个matplotlib图和一个用来给出值的光标。效果非常好。在绘图中有多达13行，我想使用复选框显示和隐藏它们，这也很好。

这是我要"重新绘制"的代码

def Draw(self, visibility = None):
    self._axes.lines = []
    # if no visibility data, draw all
    if visibility is None:
        visibility = []
        for i in range(len(self._data)):
            visibility.append(True)
    else:
        # check if length match
        if len(self._data) != len(visibility):
            raise AttributeError('Visibility list length does not match plot count')
    # draw the lines you want
    for i in range(len(self._data)):
        if visibility[i]:
            plotName = 'FFD ' + str(i + 1)
            self._axes.plot(self.timebase, self._data[i], picker=5, label = plotName)
    #if there are any lines, draw a legend
    if len(self._axes.lines):
        self._axes.legend(prop={'size':9})
    #update the canvas
    self._canvas.draw()

但这会导致每次更改时绘图颜色都会发生变化。我怎样才能让这些颜色保持不变？任何好的想法都会受到赞赏（坏的也会受到赞赏：）！

Answer 1

从与要绘制的行数相同长度的颜色图中创建颜色列表。您可以使用cm.<any_cmap>(np.linspace(0,1,number_of_lines))执行此操作。

当您调用plot时，请设置color=colours[i]。这样，每个绘图都将始终指定相同的颜色，即使没有绘制，其他线条的颜色也不会受到影响。

import numpy as np
import matplotlib.cm as cm
def Draw(self, visibility = None):
    nlines = len(self._data)
    # Choose whichever colormap you like here instead of jet
    colours = cm.jet(np.linspace(0,1,nlines))  # a list of colours the same length as your data
    self._axes.lines = []
    # if no visibility data, draw all
    if visibility is None:
        visibility = []
        for i in range(len(self._data)):
            visibility.append(True)
    else:
        # check if length match
        if len(self._data) != len(visibility):
            raise AttributeError('Visibility list length does not match plot count')
    # draw the lines you want
    for i in range(len(self._data)):
        if visibility[i]:
            plotName = 'FFD ' + str(i + 1)
            # pick a colour from the colour list using the color kwarg
            self._axes.plot(self.timebase, self._data[i], picker=5, color=colours[i], label = plotName)
    #if there are any lines, draw a legend
    if len(self._axes.lines):
        self._axes.legend(prop={'size':9})
    #update the canvas
    self._canvas.draw()

Answer 2

这是一个糟糕的例子：

尝试将alpha=0设置为有效地隐藏沿着self._axes.lines[mylineindex].set_alpha(0.0)执行某些操作的行。通过这种方式，您应该只需要重新绘制那一行。