.. _misc-contour_manual:

misc example code: contour_manual.py
====================================



.. plot:: /home/tcaswell/source/p/matplotlib/doc/mpl_examples/misc/contour_manual.py

::

    """
    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]]]
    
    
    plt.figure()
    
    # Filled contours using filled=True.
    cs = ContourSet(plt.gca(), [0, 1, 2], [filled01, filled12], filled=True, cmap=cm.bone)
    cbar = plt.colorbar(cs)
    
    # Contour lines (non-filled).
    lines = ContourSet(plt.gca(), [0, 1, 2], [lines0, lines1, lines2], cmap=cm.cool,
                       linewidths=3)
    cbar.add_lines(lines)
    
    plt.axis([-0.5, 3.5, -0.5, 4.5])
    plt.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.
    
    plt.figure()
    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(plt.gca(), [0, 1], [filled01], [kinds01], filled=True)
    cbar = plt.colorbar(cs)
    
    plt.axis([-0.5, 3.5, -0.5, 3.5])
    plt.title('User specified filled contours with holes')
    
    plt.show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)