Matplotlib控制哪个情节在上面

Question

I am wondering if there is a way to control which plot lies on top of other plots if one makes multiple plots on one axis. An example:

As you can see, the green series is on top of the blue series, and both series are on top of the black dots (which I made with a scatter plot). I would like the black dots to be on top of both series (lines).

I first did the above with the following code

plt.plot(series1_x, series1_y)
plt.plot(series2_x, series2_y)
plt.scatter(series2_x, series2_y)

Then I tried the following

fig = plt.figure()
ax1 = fig.add_subplot(111)
ax1.plot(series1_x, series1_y)

ax2 = fig.add_subplot(111)
ax2.plot(series2_x, series2_y)

ax3 = fig.add_subplot(111)
ax3.scatter(series2_x, series2_y)

And some variations on that, but no luck.

Swapping around the plot functions has an effect on which plot is on top, but no matter where I put the scatter function, the lines are on top of the dots.

NOTE:

I am using Python 3.5 on Windows 10 (this example), but mostly Python 3.4 on Ubuntu.

NOTE 2:

I know this may seem like a trivial issue, but I have a case where the series on top of the dots are so dense that the colour of the dots get obscured, and in those cases I need my readers to clearly see which dots are what colour, hence why I need the dots to be on top.

Answer 1

Use the zorder kwarg where the lower the zorder the further back the plot, eg

plt.plot(series1_x, series1_y, zorder=1)
plt.plot(series2_x, series2_y, zorder=2)
plt.scatter(series2_x, series2_y, zorder=3)

Answer 2

Yes, you can. Just use zorder parameter. The higher the value, more on top the plot shall be.

fig = plt.figure()
ax1 = fig.add_subplot(111)
ax1.plot(series1_x, series1_y, zorder=3)

ax2 = fig.add_subplot(111)
ax2.plot(series2_x, series2_y, zorder=4)

ax3 = fig.add_subplot(111)
ax3.scatter(series2_x, series2_y, zorder=5)

Alternatively, you can do line and marker plot at the same time. You can even set different colors for line and marker face.

fig = plt.figure()
ax1 = fig.add_subplot(111)
ax1.plot(series1_x, series1_y)

ax2 = fig.add_subplot(111)
ax2.plot(series2_x, series2_y, '-o', color='b', mfc='k')

The '-o' sets plot style to line and circle markers, color='b' sets line color to blue and mfc='k' sets the marker face color to black.

Answer 3

Another solution besides using zorder, and worth knowing: You can simply plot a scatter of points using the plot command. Something like plot(series2_x, series2_y, ' o') . Note the ' o' with a space means no lines but circle points. This way the order of plotting them on the axes does put them on top.