utils.py

import matplotlib.pyplot as plt

def plot_history(history):
	plt.figure(figsize=(14, 6))
	plt.subplot(1, 2, 2)
	plt.plot(history.history['acc'])
	plt.plot(history.history['val_acc'])
	plt.ylabel('acurácia')
	plt.xlabel('época')
	plt.legend(['treino', 'teste'], loc='upper left')

	plt.subplot(1, 2, 1)
	plt.plot(history.history['loss'])
	plt.plot(history.history['val_loss'])
	plt.ylabel('loss')
	plt.xlabel('época')
	plt.legend(['treino', 'teste'], loc='upper left')
	plt.tight_layout()
	plt.show()
	
def on_draw(event):
	"""Auto-wraps all text objects in a figure at draw-time"""
	import matplotlib as mpl
	fig = event.canvas.figure

	# Cycle through all artists in all the axes in the figure
	for ax in fig.axes:
		for artist in ax.get_children():
			# If it's a text artist, wrap it...
			if isinstance(artist, mpl.text.Text):
				autowrap_text(artist, event.renderer)

	# Temporarily disconnect any callbacks to the draw event...
	# (To avoid recursion)
	func_handles = fig.canvas.callbacks.callbacks[event.name]
	fig.canvas.callbacks.callbacks[event.name] = {}
	# Re-draw the figure..
	fig.canvas.draw()
	# Reset the draw event callbacks
	fig.canvas.callbacks.callbacks[event.name] = func_handles

def autowrap_text(textobj, renderer):
    """Wraps the given matplotlib text object so that it exceed the boundaries
    of the axis it is plotted in."""
    import textwrap
    # Get the starting position of the text in pixels...
    x0, y0 = textobj.get_transform().transform(textobj.get_position())
    # Get the extents of the current axis in pixels...
    clip = textobj.get_axes().get_window_extent()
    # Set the text to rotate about the left edge (doesn't make sense otherwise)
    textobj.set_rotation_mode('anchor')

    # Get the amount of space in the direction of rotation to the left and 
    # right of x0, y0 (left and right are relative to the rotation, as well)
    rotation = textobj.get_rotation()
    right_space = min_dist_inside((x0, y0), rotation, clip)
    left_space = min_dist_inside((x0, y0), rotation - 180, clip)

    # Use either the left or right distance depending on the horiz alignment.
    alignment = textobj.get_horizontalalignment()
    if alignment is 'left':
        new_width = right_space 
    elif alignment is 'right':
        new_width = left_space
    else:
        new_width = 2 * min(left_space, right_space)

    # Estimate the width of the new size in characters...
    aspect_ratio = 0.5 # This varies with the font!! 
    fontsize = textobj.get_size()
    pixels_per_char = aspect_ratio * renderer.points_to_pixels(fontsize)

    # If wrap_width is < 1, just make it 1 character
    wrap_width = max(1, new_width // pixels_per_char)
    try:
        wrapped_text = textwrap.fill(textobj.get_text(), wrap_width)
    except TypeError:
        # This appears to be a single word
        wrapped_text = textobj.get_text()
    textobj.set_text(wrapped_text)

def min_dist_inside(point, rotation, box):
    """Gets the space in a given direction from "point" to the boundaries of
    "box" (where box is an object with x0, y0, x1, & y1 attributes, point is a
    tuple of x,y, and rotation is the angle in degrees)"""
    from math import sin, cos, radians
    x0, y0 = point
    rotation = radians(rotation)
    distances = []
    threshold = 0.0001 
    if cos(rotation) > threshold: 
        # Intersects the right axis
        distances.append((box.x1 - x0) / cos(rotation))
    if cos(rotation) < -threshold: 
        # Intersects the left axis
        distances.append((box.x0 - x0) / cos(rotation))
    if sin(rotation) > threshold: 
        # Intersects the top axis
        distances.append((box.y1 - y0) / sin(rotation))
    if sin(rotation) < -threshold: 
        # Intersects the bottom axis
        distances.append((box.y0 - y0) / sin(rotation))
    return min(distances)