library: add hipsterplot.py

library/hipsterplot.py

@@ -0,0 +1,126 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# The MIT License (MIT)
+#
+# Copyright (c) 2014 Ian Horn <horn.imh@gmail.com> and
+#                    Danilo J. S. Bellini <danilo.bellini@gmail.com>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+from __future__ import print_function, division
+import math, random, sys
+from operator import itemgetter
+
+# Python 2.x and 3.x compatibility
+if sys.version_info.major == 2:
+    range = xrange
+    from future_builtins import map, zip
+
+
+CHAR_LOOKUP_SYMBOLS = [(0, ' '), # Should be sorted
+                       (1, '.'),
+                       (2, ':'),
+                       #(3, '!'),
+                       (4, '|'),
+                       #(8, '+'),
+                       (float("inf"), '#')]
+
+def charlookup(num_chars):
+    """ Character for the given amount of elements in the bin """
+    return next(ch for num, ch in CHAR_LOOKUP_SYMBOLS if num_chars <= num)
+
+
+def bin_generator(data, bin_ends):
+    """ Yields a list for each bin """
+    max_idx_end = len(bin_ends) - 1
+    iends = enumerate(bin_ends)
+
+    idx_end, value_end = next(iends)
+    bin_data = []
+    for el in sorted(data):
+        while el >= value_end and idx_end != max_idx_end:
+            yield bin_data
+            bin_data = []
+            idx_end, value_end = next(iends)
+        bin_data.append(el)
+
+    # Finish
+    for unused in iends:
+        yield bin_data
+        bin_data = []
+    yield bin_data
+
+
+def enumerated_reversed(seq):
+    """ A version of reversed(enumerate(seq)) that actually works """
+    return zip(range(len(seq) - 1, -1, -1), reversed(seq))
+
+
+def plot(y_vals, x_vals=None, num_x_chars=70, num_y_chars=15):
+    """
+    Plots the values given by y_vals. The x_vals values are the y indexes, by
+    default, unless explicitly given. Pairs (x, y) are matched by the x_vals
+    and y_vals indexes, so these must have the same length.
+
+    The num_x_chars and num_y_chars inputs are respectively the width and
+    height for the output plot to be printed, given in characters.
+    """
+    y_vals = list(y_vals)
+    x_vals = list(x_vals) if x_vals else list(range(len(y_vals)))
+    if len(x_vals) != len(y_vals):
+        raise ValueError("x_vals and y_vals must have the same length")
+
+    ymin = min(y_vals)
+    ymax = max(y_vals)
+    xmin = min(x_vals)
+    xmax = max(x_vals)
+
+    xbinwidth = (xmax - xmin) / num_x_chars
+    y_bin_width = (ymax - ymin) / num_y_chars
+
+    x_bin_ends = [(xmin + (i+1) * xbinwidth, 0) for i in range(num_x_chars)]
+    y_bin_ends = [ymin + (i+1) * y_bin_width for i in range(num_y_chars)]
+
+    columns_pairs = bin_generator(zip(x_vals, y_vals), x_bin_ends)
+    yloop = lambda *args: [charlookup(len(el)) for el in bin_generator(*args)]
+    ygetter = lambda iterable: map(itemgetter(1), iterable)
+    columns = (yloop(ygetter(pairs), y_bin_ends) for pairs in columns_pairs)
+    rows = list(zip(*columns))
+
+    for idx, row in enumerated_reversed(rows):
+        y_bin_mid = y_bin_ends[idx] - y_bin_width * 0.5
+        print("{:10.4f} {}".format(y_bin_mid, "".join(row)))
+
+
+if __name__ == '__main__':
+    # Some examples
+    ys = [math.cos(x/5.0) for x in range(180)]
+    num_x_chars = min(70, len(ys))
+    plot(ys, num_x_chars=num_x_chars, num_y_chars=15)
+
+    xs = [50.0*random.random() for x in range(180)]
+    ys = [math.cos(x/5.0) for x in xs]
+    num_x_chars = min(70, len(ys))
+    plot(ys, x_vals=xs, num_x_chars=num_x_chars, num_y_chars=15)
+
+    k = 20
+    ys = [random.gauss(0, 0.5) + math.cos(x/5.0/k) for x in range(180*k)]
+    num_x_chars = min(160, len(ys))
+    plot(ys, num_x_chars=num_x_chars, num_y_chars=25)