.. only:: html
.. note::
:class: sphx-glr-download-link-note
Click :ref:`here ` to download the full example code
.. rst-class:: sphx-glr-example-title
.. _sphx_glr_gallery_misc_contour_manual.py:
==============
Manual Contour
==============
Example of displaying your own contour lines and polygons using ContourSet.
.. code-block:: default
import matplotlib.pyplot as plt
from matplotlib.contour import ContourSet
import matplotlib.cm as cm
Contour lines for each level are a list/tuple of polygons.
.. code-block:: default
lines0 = [[[0, 0], [0, 4]]]
lines1 = [[[2, 0], [1, 2], [1, 3]]]
lines2 = [[[3, 0], [3, 2]], [[3, 3], [3, 4]]] # Note two lines.
Filled contours between two levels are also a list/tuple of polygons.
Points can be ordered clockwise or anticlockwise.
.. code-block:: default
filled01 = [[[0, 0], [0, 4], [1, 3], [1, 2], [2, 0]]]
filled12 = [[[2, 0], [3, 0], [3, 2], [1, 3], [1, 2]], # Note two polygons.
[[1, 4], [3, 4], [3, 3]]]
.. code-block:: default
fig, ax = plt.subplots()
# Filled contours using filled=True.
cs = ContourSet(ax, [0, 1, 2], [filled01, filled12], filled=True, cmap=cm.bone)
cbar = fig.colorbar(cs)
# Contour lines (non-filled).
lines = ContourSet(
ax, [0, 1, 2], [lines0, lines1, lines2], cmap=cm.cool, linewidths=3)
cbar.add_lines(lines)
ax.set(xlim=(-0.5, 3.5), ylim=(-0.5, 4.5),
title='User-specified contours')
.. image:: /gallery/misc/images/sphx_glr_contour_manual_001.png
:alt: User-specified contours
:class: sphx-glr-single-img
.. rst-class:: sphx-glr-script-out
Out:
.. code-block:: none
[(-0.5, 3.5), (-0.5, 4.5), Text(0.5, 1.0, 'User-specified contours')]
Multiple filled contour lines can be specified in a single list of polygon
vertices along with a list of vertex kinds (code types) as described in the
Path class. This is particularly useful for polygons with holes.
Here a code type of 1 is a MOVETO, and 2 is a LINETO.
.. code-block:: default
fig, ax = plt.subplots()
filled01 = [[[0, 0], [3, 0], [3, 3], [0, 3], [1, 1], [1, 2], [2, 2], [2, 1]]]
kinds01 = [[1, 2, 2, 2, 1, 2, 2, 2]]
cs = ContourSet(ax, [0, 1], [filled01], [kinds01], filled=True)
cbar = fig.colorbar(cs)
ax.set(xlim=(-0.5, 3.5), ylim=(-0.5, 3.5),
title='User specified filled contours with holes')
plt.show()
.. image:: /gallery/misc/images/sphx_glr_contour_manual_002.png
:alt: User specified filled contours with holes
:class: sphx-glr-single-img
.. _sphx_glr_download_gallery_misc_contour_manual.py:
.. only :: html
.. container:: sphx-glr-footer
:class: sphx-glr-footer-example
.. container:: sphx-glr-download sphx-glr-download-python
:download:`Download Python source code: contour_manual.py `
.. container:: sphx-glr-download sphx-glr-download-jupyter
:download:`Download Jupyter notebook: contour_manual.ipynb `
.. only:: html
.. rst-class:: sphx-glr-signature
Keywords: matplotlib code example, codex, python plot, pyplot
`Gallery generated by Sphinx-Gallery
`_