"""
Slice: columns, and the profile in the heatmap's place
=========================================================

The same tool sliced the other way. **Slice Y** cuts a *column* instead of a
row, and the **Slice view** radio chooses where the profile is drawn: in a strip
beside the heatmap (the default), *in place of* the heatmap, or not at all,
leaving just a dashed cursor on the heatmap. "Profile replaces heatmap" gives
the line the whole axes, which is the view to use when the values matter more
than the picture around them.

The field is a damped standing wave along y that drifts across x. Columns
therefore show a clean decaying oscillation, and stepping the slider moves the
phase. **Gridlines on profile** (on by default, and also settable up front with
``"grid": False``) puts light lines at the value ticks and at the heatmap's own
ticks, so a value can be read straight across.

.. code-block:: python

   options={"slice": {"enabled": True, "orientation": "y",
                      "view": "replace", "index": 12, "grid": True}}
"""
import numpy as np
import plotpress

x = np.linspace(0, 8, 65)
y = np.linspace(0, 12, 97)
X, Y = np.meshgrid((x[:-1] + x[1:]) / 2, (y[:-1] + y[1:]) / 2)
field = np.exp(-Y / 6) * np.cos(2 * np.pi * (Y / 3 - X / 8))

fig, ax = plotpress.subplots(figsize=(7, 5))
mesh = ax.pcolormesh(x, y, field, cmap="RdBu_r", vmin=-1, vmax=1)
ax.set_xlabel("position x")
ax.set_ylabel("depth y")
ax.set_title("Damped standing wave")
fig.colorbar(mesh, ax=ax, label="amplitude")
fig.tight_layout()

_gallery_interactive_options = {"slice": {
    "enabled": True, "orientation": "y", "view": "replace", "index": 12, "grid": True}}