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Side by Side Diff: build/android/devil/utils/geometry.py

Issue 1770943003: [Android] Remove chromium version of devil. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: rebase Created 4 years, 9 months ago
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1 # Copyright 2015 The Chromium Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
4
5 """Objects for convenient manipulation of points and other surface areas."""
6
7 import collections
8
9
10 class Point(collections.namedtuple('Point', ['x', 'y'])):
11 """Object to represent an (x, y) point on a surface.
12
13 Args:
14 x, y: Two numeric coordinates that define the point.
15 """
16 __slots__ = ()
17
18 def __str__(self):
19 """Get a useful string representation of the object."""
20 return '(%s, %s)' % (self.x, self.y)
21
22 def __add__(self, other):
23 """Sum of two points, e.g. p + q."""
24 if isinstance(other, Point):
25 return Point(self.x + other.x, self.y + other.y)
26 else:
27 return NotImplemented
28
29 def __mul__(self, factor):
30 """Multiplication on the right is not implemented."""
31 # This overrides the default behaviour of a tuple multiplied by a constant
32 # on the right, which does not make sense for a Point.
33 return NotImplemented
34
35 def __rmul__(self, factor):
36 """Multiply a point by a scalar factor on the left, e.g. 2 * p."""
37 return Point(factor * self.x, factor * self.y)
38
39
40 class Rectangle(
41 collections.namedtuple('Rectangle', ['top_left', 'bottom_right'])):
42 """Object to represent a rectangle on a surface.
43
44 Args:
45 top_left: A pair of (left, top) coordinates. Might be given as a Point
46 or as a two-element sequence (list, tuple, etc.).
47 bottom_right: A pair (right, bottom) coordinates.
48 """
49 __slots__ = ()
50
51 def __new__(cls, top_left, bottom_right):
52 if not isinstance(top_left, Point):
53 top_left = Point(*top_left)
54 if not isinstance(bottom_right, Point):
55 bottom_right = Point(*bottom_right)
56 return super(Rectangle, cls).__new__(cls, top_left, bottom_right)
57
58 def __str__(self):
59 """Get a useful string representation of the object."""
60 return '[%s, %s]' % (self.top_left, self.bottom_right)
61
62 @property
63 def center(self):
64 """Get the point at the center of the rectangle."""
65 return 0.5 * (self.top_left + self.bottom_right)
66
67 @classmethod
68 def FromDict(cls, d):
69 """Create a rectangle object from a dictionary.
70
71 Args:
72 d: A dictionary (or mapping) of the form, e.g., {'top': 0, 'left': 0,
73 'bottom': 1, 'right': 1}.
74 """
75 return cls(Point(d['left'], d['top']), Point(d['right'], d['bottom']))
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