|
| 1 | +"""This module contains a code example related to |
| 2 | +
|
| 3 | +Think Python, 2nd Edition |
| 4 | +by Allen Downey |
| 5 | +http://thinkpython2.com |
| 6 | +
|
| 7 | +Copyright 2015 Allen Downey |
| 8 | +
|
| 9 | +License: http://creativecommons.org/licenses/by/4.0/ |
| 10 | +""" |
| 11 | + |
| 12 | +from __future__ import print_function, division |
| 13 | + |
| 14 | +import copy |
| 15 | + |
| 16 | +from Point1 import Point, Rectangle, print_point |
| 17 | +from Point1_soln import distance_between_points |
| 18 | + |
| 19 | + |
| 20 | +class Circle(object): |
| 21 | + """Represents a circle. |
| 22 | +
|
| 23 | + Attributes: center, radius |
| 24 | + """ |
| 25 | + |
| 26 | + |
| 27 | +def point_in_circle(point, circle): |
| 28 | + """Checks whether a point lies inside a circle (or on the boundary). |
| 29 | +
|
| 30 | + point: Point object |
| 31 | + circle: Circle object |
| 32 | + """ |
| 33 | + d = distance_between_points(point, circle.center) |
| 34 | + print(d) |
| 35 | + return d <= circle.radius |
| 36 | + |
| 37 | + |
| 38 | +def rect_in_circle(rect, circle): |
| 39 | + """Checks whether the corners of a rect fall in/on a circle. |
| 40 | +
|
| 41 | + rect: Rectangle object |
| 42 | + circle: Circle object |
| 43 | + """ |
| 44 | + p = copy.copy(rect.corner) |
| 45 | + print_point(p) |
| 46 | + if not point_in_circle(p, circle): |
| 47 | + return False |
| 48 | + |
| 49 | + p.x += rect.width |
| 50 | + print_point(p) |
| 51 | + if not point_in_circle(p, circle): |
| 52 | + return False |
| 53 | + |
| 54 | + p.y -= rect.height |
| 55 | + print_point(p) |
| 56 | + if not point_in_circle(p, circle): |
| 57 | + return False |
| 58 | + |
| 59 | + p.x -= rect.width |
| 60 | + print_point(p) |
| 61 | + if not point_in_circle(p, circle): |
| 62 | + return False |
| 63 | + |
| 64 | + return True |
| 65 | + |
| 66 | + |
| 67 | +def rect_circle_overlap(rect, circle): |
| 68 | + """Checks whether any corners of a rect fall in/on a circle. |
| 69 | +
|
| 70 | + rect: Rectangle object |
| 71 | + circle: Circle object |
| 72 | + """ |
| 73 | + p = copy.copy(rect.corner) |
| 74 | + print_point(p) |
| 75 | + if point_in_circle(p, circle): |
| 76 | + return True |
| 77 | + |
| 78 | + p.x += rect.width |
| 79 | + print_point(p) |
| 80 | + if point_in_circle(p, circle): |
| 81 | + return True |
| 82 | + |
| 83 | + p.y -= rect.height |
| 84 | + print_point(p) |
| 85 | + if point_in_circle(p, circle): |
| 86 | + return True |
| 87 | + |
| 88 | + p.x -= rect.width |
| 89 | + print_point(p) |
| 90 | + if point_in_circle(p, circle): |
| 91 | + return True |
| 92 | + |
| 93 | + return False |
| 94 | + |
| 95 | + |
| 96 | +def main(): |
| 97 | + box = Rectangle() |
| 98 | + box.width = 100.0 |
| 99 | + box.height = 200.0 |
| 100 | + box.corner = Point() |
| 101 | + box.corner.x = 50.0 |
| 102 | + box.corner.y = 50.0 |
| 103 | + |
| 104 | + print(box.corner.x) |
| 105 | + print(box.corner.y) |
| 106 | + |
| 107 | + circle = Circle |
| 108 | + circle.center = Point() |
| 109 | + circle.center.x = 100.0 |
| 110 | + circle.center.y = 100.0 |
| 111 | + circle.radius = 75.0 |
| 112 | + |
| 113 | + print(circle.center.x) |
| 114 | + print(circle.center.y) |
| 115 | + print(circle.radius) |
| 116 | + |
| 117 | + print(point_in_circle(box.corner, circle)) |
| 118 | + print(rect_in_circle(box, circle)) |
| 119 | + print(rect_circle_overlap(box, circle)) |
| 120 | + |
| 121 | + |
| 122 | +if __name__ == '__main__': |
| 123 | + main() |
| 124 | + |
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