Matplotlib 3.0 Cookbook

How to do it...

The following code block plots two axes, four points, and the connectivity between them. This is a kind of annotation without any text:

1. Define the figure, size, layout, and axes:

fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(6, 3))

2. Define two points on the data coordinate system and declare the coordinate system for them:

pointA = (0.2, 0.2)pointB = (0.8, 0.8)coordsA = "data"coordsB = "data"

3. Define the connection between the two points:

con = ConnectionPatch(pointA, pointB, coordsA, coordsB, arrowstyle="fancy",                       shrinkA=5, shrinkB=5, fc="k")

4. Plot two points with marker "o" on ax1:

ax1.plot([pointA[0], pointB[0]], [pointA[1], pointB[1]], "o")

5. Add the connection artist to ax1:

ax1.add_artist(con)

6. Print the text ...