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.
Filled contours between two levels are also a list/tuple of polygons. Points can be ordered clockwise or anticlockwise.
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')
Out:
[(-0.5, 4.5), (-0.5, 3.5), 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.
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()
Keywords: matplotlib code example, codex, python plot, pyplot Gallery generated by Sphinx-Gallery