Function plot_quadrants

galleries/examples/mplot3d/intersecting_planes.py:26–71

For a given 3d *array* plot a plane with *fixed_coord*, using four quadrants.

(ax, array, fixed_coord, cmap)

def plot_quadrants(ax, array, fixed_coord, cmap):
    """For a given 3d *array* plot a plane with *fixed_coord*, using four quadrants."""
    nx, ny, nz = array.shape
    index = {
        'x': (nx // 2, slice(None), slice(None)),
        'y': (slice(None), ny // 2, slice(None)),
        'z': (slice(None), slice(None), nz // 2),
    }[fixed_coord]
    plane_data = array[index]

    n0, n1 = plane_data.shape
    quadrants = [
        plane_data[:n0 // 2, :n1 // 2],
        plane_data[:n0 // 2, n1 // 2:],
        plane_data[n0 // 2:, :n1 // 2],
        plane_data[n0 // 2:, n1 // 2:]
    ]

    min_val = array.min()
    max_val = array.max()

    cmap = plt.get_cmap(cmap)

    for i, quadrant in enumerate(quadrants):
        facecolors = cmap((quadrant - min_val) / (max_val - min_val))
        if fixed_coord == 'x':
            Y, Z = np.mgrid[0:ny // 2, 0:nz // 2]
            X = nx // 2 * np.ones_like(Y)
            Y_offset = (i // 2) * ny // 2
            Z_offset = (i % 2) * nz // 2
            ax.plot_surface(X, Y + Y_offset, Z + Z_offset, rstride=1, cstride=1,
                            facecolors=facecolors, shade=False)
        elif fixed_coord == 'y':
            X, Z = np.mgrid[0:nx // 2, 0:nz // 2]
            Y = ny // 2 * np.ones_like(X)
            X_offset = (i // 2) * nx // 2
            Z_offset = (i % 2) * nz // 2
            ax.plot_surface(X + X_offset, Y, Z + Z_offset, rstride=1, cstride=1,
                            facecolors=facecolors, shade=False)
        elif fixed_coord == 'z':
            X, Y = np.mgrid[0:nx // 2, 0:ny // 2]
            Z = nz // 2 * np.ones_like(X)
            X_offset = (i // 2) * nx // 2
            Y_offset = (i % 2) * ny // 2
            ax.plot_surface(X + X_offset, Y + Y_offset, Z, rstride=1, cstride=1,
                            facecolors=facecolors, shade=False)


def figure_3D_array_slices(array, cmap=None):