"""
===========================
How to use the LineAnimator
===========================

This example shows off some ways in which you can use the
LineAnimator object to animate line plots.
"""
import matplotlib.pyplot as plt
import numpy as np
from mpl_animators import LineAnimator

###############################################################################
# Animate a 2D cube of random data as a line plot along an
# axis where the x-axis drifts with time.

# Define some random data
data_shape0 = (10, 20)
data0 = np.random.rand(*data_shape0)

###############################################################################
# Define the axis that will make up the line plot.

plot_axis0 = 1
slider_axis0 = 0

###############################################################################
# Let's customize the values along the x-axis.  To do this, we must define the
# edges of the pixels/bins being plotted along the x-axis.  This requires us to
# supply an array, say xdata, of length equal to data.shape[plot_axis_index]+1.
# In this example, the data has a shape of (10, 20) and let's say we are
# iterating through the 0th axis and plotting the 1st axis,
# i.e. plot_axis_index=1.  Therefore we need to define an xdata array of length
# 21.
# This will give the same customized x-axis values for each frame of the
# animation. However, what if we want the x-axis values to change as we
# animate through the other dimensions of the cube?  To do this we supply a
# (10, 21) xdata where each row (i.e. xdata[i, :]) gives the pixel/bin edges
# along the x-axis for the of the i-th frame of the animation.  Note that this
# API extends in the same way to higher dimension. In our 2D case here though,
# we can define our non-constant x-axis values like so:

xdata = np.tile(np.linspace(0, 100, (data_shape0[plot_axis0] + 1)), (data_shape0[slider_axis0], 1))

###############################################################################
# Generate animation object with variable x-axis data.

ani = LineAnimator(data0, plot_axis_index=plot_axis0, axis_ranges=[None, xdata]).get_animation()

plt.show()