Python - Classes and Objects(Point, Circle, Rectangle, In, Out, Overlap)

Think Python

開発環境

• macOS Sierra - Apple (OS)
• Emacs (Text Editor)
• Python 3.5 (プログラミング言語)

Think Python (Allen B. Downey (著)、 O'Reilly Media)のChapter 15.(Classes and Objects)のExercises 15-1.(No. 3559)を取り組んでみる。

Exercises 15-1.(No. 3559)

コード(Emacs)

test

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import unittest
from sample1 import *


class Test(unittest.TestCase):

    def setUp(self):
        self.point = Point(0, 0)
        self.circle = Circle(self.point, 10)

    def tearDown(self):
        pass

    def test_point_in(self):
        p = Point(0, 1)
        self.assertTrue(point_in_circle(self.circle, p))

    def test_point_bound(self):
        p = Point(0, 10)
        self.assertTrue(point_in_circle(self.circle, p))

    def test_point_out(self):
        p = Point(11, 0)
        self.assertFalse(point_in_circle(self.circle, p))

    def test_rect_in(self):
        r = Rectangle(1, 2, self.point)
        self.assertTrue(rect_in_circle(self.circle, r))

    def test_rect_bound(self):
        w = 10 * math.cos(math.pi / 4)
        h = 2 * 10 * math.sin(math.pi / 4)
        p = Point(0, -10 * math.sin(math.pi / 4))
        r = Rectangle(w, h, p)
        self.assertTrue(rect_in_circle(self.circle, r))

    def test_rect_out(self):
        r = Rectangle(11, 2, self.point)
        self.assertFalse(rect_in_circle(self.circle, r))

    def test_rect_overlap(self):
        r = Rectangle(1, 2, Point(10, 0))
        self.assertTrue(rect_circle_overlap(self.circle, r))

    def test_rect_overlap_false(self):
        r = Rectangle(1, 2, Point(10.1, 0))
        self.assertFalse(rect_circle_overlap(self.circle, r))

if __name__ == '__main__':
    unittest.main()

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import math


class Point:

    def __init__(self, x, y):
        self.x = x
        self.y = y


class Rectangle:

    def __init__(self, width, height, corner):
        self.width = width
        self.height = height
        self.corner = corner


class Circle:

    def __init__(self, center, radius):
        self.center = center
        self.radius = radius


def point_in_circle(circle, point):
    return math.sqrt(
        (circle.center.x - point.x) ** 2 + (circle.center.y - point.y) ** 2
    ) <= circle.radius


def rect_in_circle(circle, rect):
    p1 = rect.corner
    p2 = Point(rect.corner.x, rect.corner.y + rect.width)
    p3 = Point(rect.corner.x + rect.width, rect.corner.y + rect.width)
    p4 = Point(rect.corner.x + rect.width, rect.corner.y)
    return all(map(lambda p: point_in_circle(circle, p),
                   (p1, p2, p3, p4)))


def rect_circle_overlap(circle, rect):
    p1 = rect.corner
    p2 = Point(rect.corner.x, rect.corner.y + rect.width)
    p3 = Point(rect.corner.x + rect.width, rect.corner.y + rect.width)
    p4 = Point(rect.corner.x + rect.width, rect.corner.y)
    return any(map(lambda p: point_in_circle(circle, p),
                   (p1, p2, p3, p4)))

入出力結果(Terminal, IPython)

$ ./test_sample1.py
........
----------------------------------------------------------------------
Ran 8 tests in 0.003s

OK
$