Python 部分透明的散点图，但带有纯色条
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Partially transparent scatter plot, but with a solid color bar
提问by Eric O Lebigot
In Python, with Matplotlib, how to simply do a scatter plot with transparency (alpha < 1), but with a color bar that represents their color value, but has alpha = 1?
在 Python 中，使用 Matplotlib，如何简单地绘制具有透明度（alpha < 1）的散点图，但使用表示其颜色值的颜色条，但 alpha = 1？
Here is what one gets, with from pylab import *; scatter(range(10), arange(0, 100, 10), c=range(10), alpha=0.2); color_bar = colorbar():
这是一个得到的，用from pylab import *; scatter(range(10), arange(0, 100, 10), c=range(10), alpha=0.2); color_bar = colorbar()：
How can the color bar be made non-transparent?
如何使颜色条不透明？
PS: I tried color_bar.set_alpha(1); draw(), but this did not do anything…
PS：我试过了color_bar.set_alpha(1); draw()，但这没有做任何事情......
采纳答案by Eric O Lebigot
Alright, I found one way to do it, that looks relatively clean: (using the ColorBarobject from the question)
好吧，我找到了一种方法，看起来比较干净：（使用ColorBar问题中的对象）
color_bar.set_alpha(1)
color_bar.draw_all()
# pylab.draw() or pyplot.draw() might be necessary
It would be great to get a confirmation that this is the most robust way to proceed, though! :)
不过，如果能确认这是最稳健的继续方式，那就太好了！:)
回答by Steve Tjoa
This is a huge, ugly hack. But no other way would work. Maybe someone else can improve.
这是一个巨大而丑陋的黑客。但没有其他方法行得通。也许其他人可以改进。
fig1 = pylab.figure()
fig2 = pylab.figure()
ax1 = fig1.add_subplot(111)
ax2 = fig2.add_subplot(111)
ax1.scatter(range(10), range(10), c=range(10), alpha=0.2)
im = ax2.scatter(range(10), range(10), c=range(10), alpha=1.0)
fig1.colorbar(im, ax=ax1)
fig1.show()
