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Rewrite dashes example #10992

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Apr 8, 2018
+25 −13
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Rewrite dashes example #10992

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38 changes: 25 additions & 13 deletions examples/lines_bars_and_markers/line_demo_dash_control.py
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Original file line number Diff line number Diff line change
@@ -1,25 +1,37 @@
"""
=======================================
A simple plot with a custom dashed line
=======================================
==============================
Customizing dashed line styles
==============================

A Line object's ``set_dashes`` method allows you to specify dashes with
a series of on/off lengths (in points).
The dashing of a line is controlled via a dash sequence. It can be modified
using `.Line2D.set_dashes`.

The dash sequence is a series of on/off lengths in points, e.g.
``[3, 1]`` would be 3pt long lines separated by 1pt spaces.

Some functions like `.Axes.plot` support passing Line properties as keyword
arguments. In such a case, you can already set the dashing when creating the
line.

*Note*: The dash style can also be configured via a
:ref:`property_cycle <sphx_glr_tutorials_intermediate_color_cycle.py>`
by passing a list of dash sequences using the keyword *dashes* to the
cycler. This is not shown within this example.
"""
import numpy as np
import matplotlib.pyplot as plt


x = np.linspace(0, 10, 500)
dashes = [10, 5, 100, 5] # 10 points on, 5 off, 100 on, 5 off
y = np.sin(x)

fig, ax = plt.subplots()
line1, = ax.plot(x, np.sin(x), '--', linewidth=2,
label='Dashes set retroactively')
line1.set_dashes(dashes)

line2, = ax.plot(x, -1 * np.sin(x), dashes=[30, 5, 10, 5],
label='Dashes set proactively')
# Using set_dashes() to modify dashing of an existing line
line1, = ax.plot(x, y, label='Using set_dashes()')
line1.set_dashes([2, 2, 10, 2]) # 2pt line, 2pt break, 10pt line, 2pt break

# Using plot(..., dashes=...) to set the dashing when creating a line
line2, = ax.plot(x, y - 0.2, dashes=[6, 2], label='Using the dashes parameter')

ax.legend(loc='lower right')
ax.legend()
plt.show()