>>> """
==============
Manual Contour
==============

Example of displaying your own contour lines and polygons using ContourSet.
"""
... 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.
... 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.
... 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]]]
... 
... ###############################################################################
... 
... 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')
... 
... ###############################################################################
... # 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.
... 
... 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()
...