draw-windscreenswiper.py

#!/usr/bin/python3

l = [[" "]]
l_len_y = len(l)
l_len_x = len(l[0])

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

def out():
    for i in l:
        print("".join(i))

def plot(p, c):
    x = round(p.x); y = round(p.y)
    global l_len_y
    if y > l_len_y:
        for i in range(l_len_y, y):
            l.append([" " for n in range(l_len_x)])
        l_len_y = y
    global l_len_x
    if x > l_len_x:
        for i in range(l_len_y):
            l[i].extend([" " for n in range(x-l_len_x)])
        l_len_x = x
    l[y-1][x-1] = c

def draw_line(p0, p1, c):
    x0 = p0.x; y0 = p0.y
    x1 = p1.x; y1 = p1.y
    del p0, p1
    if x0 < 0 or x1 < 0 or y0 < 0 or y1 < 0:
        print("negative coordinate")
        return
    if x1 == x0:
        for y in range(round(y0), round(y1)):
            plot(point(x0, y), c)
        return
    s = (y1-y0)/(x1-x0)
    if s < -1 or s > 1:
        if y0 > y1:
            x0, x1 = x1, x0
            y0, y1 = y1, y0
        s = 1/s
        for y in range(round(y0), round(y1)+1):
            x = round(x0+s*(y-y0))
            plot(point(x, y), c)
    else:
        if x0 > x1:
            x0, x1 = x1, x0
            y0, y1 = y1, y0
        for x in range(round(x0), round(x1+1)):
            y = round(y0+s*(x-x0))
            plot(point(x, y), c)

import os
if "linux" in os.sys.platform:
    outchar = "\033[41m \033[0m"
else:
    outchar = "."
#p0 = point(3, 1);  p1 = point(22, 10); p2 = point(41, 1)
#p3 = point(1, 15); p4 = point(43, 15); p5 = point(22, 15)
#draw_line(p0, p1, a)
#draw_line(p1, p2, a)
#draw_line(p0, p3, a)
#draw_line(p2, p4, a)
#draw_line(p3, p4, a)
#draw_line(p1, p5, a)
#plot(p0, p)
#plot(p1, p)
#plot(p2, p)
#plot(p3, p)
#plot(p4, p)
#plot(p5, p)
import math
from time import sleep
i = 0
a = point(10, 2)
b = point(10+math.sin(i)*5, math.sin(math.sin(i))**2*5+math.cos(math.sin(i))**2*5)
while True:
    draw_line(a, b, " ")
    i += .5
    b = point(10+math.sin(i)*5, math.sin(math.sin(i))**2*5+math.cos(math.sin(i))**2*5)
    draw_line(a, b, outchar)
    out()
    sleep(0.1)

if 'win' in os.sys.platform:
    os.system("PAUSE")