cs2370 Notes: 05 Design, Functions on Tuples

Five steps:

Stub with Names and Purpose statement
Types
Tests
Standard pattern
Function body

Standard pattern for tuples:

Input: Unpack it
Output: Build one.

First, check out: https://github.com/NatTuck/intro-py-sim

Flying bat

Stages:

Manually load sim.funs, demo image types.
Demo some functions on images, with img.show()
Build version with one number as state.
Build 2D version with click to teleport.
Show design recipe for each function (tests don’t work yet for images).
Show version with namedtuple

import sim
from sim.funs import *

# from collections import namedtuple
# Posn = namedtuple('Posn', ['x', 'y'])

def init():
    return (0, 0)
    #return Posn(0, 0)

bat = mirror(contain(load_image("bat.png"), (200, 200)))

def draw(state):
    (x, y) = state
    return place_at(empty_scene(), bat, x % 800, y % 600)


def tick(state):
    (x, y) = state
    return (x + 2, y + 4)


def mouse_click(state, x, y, btn):
    return (x, y)


if __name__ == '__main__':
    sim.run()