<p>现在还不清楚为什么不能按照@b-fg的建议创建第二个<code>scatter</code>,但是可以编写这样的函数:</p>
<pre><code>def addPoint(scat, new_point, c='k'):
old_off = scat.get_offsets()
new_off = np.concatenate([old_off,np.array(new_point, ndmin=2)])
old_c = scat.get_facecolors()
new_c = np.concatenate([old_c, np.array(matplotlib.colors.to_rgba(c), ndmin=2)])
scat.set_offsets(new_off)
scat.set_facecolors(new_c)
scat.axes.figure.canvas.draw_idle()
</code></pre>
<p>它允许您向现有的<code>PathCollection</code>添加新点。</p>
<p>示例:</p>
<pre><code>fig, ax = plt.subplots()
scat = ax.scatter([0,1,2],[3,4,5],cmap=matplotlib.cm.spring, c=[0,2,1])
fig.canvas.draw() # if running all the code in the same cell, this is required for it to work, not sure why
addPoint(scat, [3,6], 'c')
addPoint(scat, [3.1,6.1], 'pink')
addPoint(scat, [3.2,6.2], 'r')
addPoint(scat, [3.3,6.3], 'xkcd:teal')
ax.set_xlim(-1,4)
ax.set_ylim(2,7)
</code></pre>
<p><a href="https://i.stack.imgur.com/CxfiK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CxfiK.png" alt="enter image description here"/></a></p>
<p>请注意,我建议的功能是非常基本的,并且需要根据用例使其更加智能化。重要的是要认识到<code>PathCollection</code>中的<code>facecolors</code>数组不一定具有与点数相同的元素数,因此,如果您尝试一次添加多个点数,或者如果原始点数都是相同的颜色,则颜色可能会发生有趣的事情,等等。。。</p>