.. _example_30:

(30) Trigonometric functions plotted in graph mode
--------------------------------------------------

Finally, we end with a simple mathematical illustration of sine and
cosine, highlighting the *graph* mode for linear projections and the new
curved vectors for angles.

The script simply draws a graph basemap, computes sine and cosine and
plots them as lines, then indicates on a circle that these quantities
are simply the projections of an unit vector on the x- and y-axis, at
the given angle.

.. literalinclude:: /_verbatim/example_30.txt
   :language: bash

.. figure:: /_images/example_30.*
   :width: 500 px
   :align: center

   Trigonometric functions plotted in graph mode.