Python - Tuples, Points, and Vectors - Projectile, Environment

The Ray Tracer Challenge:
A Test-Driven Guide to Your First 3D Renderer
楽天 紀伊国屋書店

開発環境

• macOS Mojave - Apple (OS)
• Emacs (Text Editor)
• Windows 10 Pro (OS)
• Visual Studio Code (Text Editor)
• Python 3.7 (プログラミング言語)

The Ray Tracer Challenge: A Test-Driven Guide to Your First 3D Renderer (Jamis Buck(著)、Pragmatic Bookshelf)、Chapter 1(Tuples, Points, and Vectors)のPut It Together(12)を取り組んでみる。

コード

Python 3

#!/usr/bin/env python3
from tuples import Point, Vector


class Projectile:
    def __init__(self, position: Point, velocity: Vector):
        self.position = position
        self.velocity = velocity


class Environment:
    def __init__(self, gravity: Vector, wind: Vector):
        self.gravity = gravity
        self.wind = wind


def tick(env: Environment, proj: Projectile) -> Projectile:
    position = proj.position + proj.velocity
    velocity = proj.velocity + env.gravity + env.wind
    return Projectile(position, velocity)


if __name__ == '__main__':
    p = Projectile(Point(0, 1, 0), Vector(1, 1, 0))
    e = Environment(Vector(0, -0.1, 0), Vector(-0.01, 0, 0))
    projectile = tick(e, p)
    while projectile.position.y > 0:
        projectile = tick(e, projectile)
        print(f'x = {projectile.position.x:.2f}, ' +
              f'y = {projectile.position.y:.2f}')

入出力結果(cmd(コマンドプロンプト)、Terminal、Bash, Jupyter(IPython))

C:\Users\...>py sample3.py
x = 1.99, y = 2.90
x = 2.97, y = 3.70
x = 3.94, y = 4.40
x = 4.90, y = 5.00
x = 5.85, y = 5.50
x = 6.79, y = 5.90
x = 7.72, y = 6.20
x = 8.64, y = 6.40
x = 9.55, y = 6.50
x = 10.45, y = 6.50
x = 11.34, y = 6.40
x = 12.22, y = 6.20
x = 13.09, y = 5.90
x = 13.95, y = 5.50
x = 14.80, y = 5.00
x = 15.64, y = 4.40
x = 16.47, y = 3.70
x = 17.29, y = 2.90
x = 18.10, y = 2.00
x = 18.90, y = 1.00
x = 19.69, y = -0.10

C:\Users\...>