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Apr 15, 2019
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Improve Rainbow text example #13914

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63 changes: 38 additions & 25 deletions examples/text_labels_and_annotations/rainbow_text.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
Example:

plt.ylabel("Today is cloudy.")

How can I show "today" as red, "is" as green and "cloudy." as blue?

Thanks.
Expand All @@ -26,43 +27,55 @@
from matplotlib import transforms


def rainbow_text(x, y, strings, colors, ax=None, **kw):
def rainbow_text(x, y, strings, colors, orientation='horizontal',
ax=None, **kwargs):
"""
Take a list of ``strings`` and ``colors`` and place them next to each
Take a list of *strings* and *colors* and place them next to each
other, with text strings[i] being shown in colors[i].

This example shows how to do both vertical and horizontal text, and will
pass all keyword arguments to plt.text, so you can set the font size,
family, etc.

The text will get added to the ``ax`` axes, if provided, otherwise the
currently active axes will be used.
Parameters
----------
x, y : float
Text position in data coordinates.
strings : list of str
The strings to draw.
colors : list of color
The colors to use.
orientation : {'horizontal', 'vertical'}
ax : Axes, optional
The Axes to draw into. If None, the current axes will be used.
**kwargs
All other keyword arguments are passed to plt.text(), so you can
set the font size, family, etc.
"""
if ax is None:
ax = plt.gca()
t = ax.transData
canvas = ax.figure.canvas

# horizontal version
for s, c in zip(strings, colors):
text = ax.text(x, y, s + " ", color=c, transform=t, **kw)
text.draw(canvas.get_renderer())
ex = text.get_window_extent()
t = transforms.offset_copy(
text.get_transform(), x=ex.width, units='dots')
assert orientation in ['horizontal', 'vertical']
if orientation == 'vertical':
kwargs.update(rotation=90, verticalalignment='bottom')

# vertical version
for s, c in zip(strings, colors):
text = ax.text(x, y, s + " ", color=c, transform=t,
rotation=90, va='bottom', ha='center', **kw)
text = ax.text(x, y, s + " ", color=c, transform=t, **kwargs)

# Need to draw to update the text position.
text.draw(canvas.get_renderer())
ex = text.get_window_extent()
t = transforms.offset_copy(
text.get_transform(), y=ex.height, units='dots')


rainbow_text(0, 0, "all unicorns poop rainbows ! ! !".split(),
['red', 'cyan', 'brown', 'green', 'blue', 'purple', 'black'],
size=16)
if orientation == 'horizontal':
t = transforms.offset_copy(
text.get_transform(), x=ex.width, units='dots')
else:
t = transforms.offset_copy(
text.get_transform(), y=ex.height, units='dots')


words = "all unicorns poop rainbows ! ! !".split()
colors = ['red', 'orange', 'gold', 'lawngreen', 'lightseagreen', 'royalblue',
'blueviolet']
plt.figure(figsize=(6, 6))
rainbow_text(0.1, 0.05, words, colors, size=18)
rainbow_text(0.05, 0.1, words, colors, orientation='vertical', size=18)

plt.show()