Статья Автор: Юровский Егор
Сетка и пунктир

import turtle as tr
import math

def dashed_segment(tr, segment, d):
    (x1, y1), (x2, y2) = segment
    if d%2==0:
        d=d+1
    if d>0:
        dash_length = d
        gap_length = d
        tr.penup()
        tr.goto(x1, y1)
        tr.pendown()

        dx, dy = x2 - x1, y2 - y1
        length = math.sqrt(dx**2 + dy**2)
        angle = math.degrees(math.atan2(dy, dx))
        tr.setheading(angle)

        drawn = 0
        while drawn < length:
            step = min(dash_length, length - drawn)
            tr.forward(step)
            drawn += step
            if drawn < length:
                tr.penup()
                step = min(gap_length, length - drawn)
                tr.forward(step)
                drawn += step
                tr.pendown()
    elif d==0:
        tr.up()
        tr.setpos((x1, y1))
        tr.down()
        tr.goto((x2, y2))
    else:
        d=abs(d)
        dx, dy = x2 - x1, y2 - y1
        length = math.sqrt(dx ** 2 + dy ** 2)
        angle = math.degrees(math.atan2(dy, dx))
        tr.setheading(angle)

        dash_length = length/d
        gap_length = length/d
        tr.penup()
        tr.goto(x1, y1)
        tr.pendown()

        drawn = 0
        while drawn < length:
            step = min(dash_length, length - drawn)
            tr.forward(step)
            drawn += step
            if drawn < length:
                tr.penup()
                step = min(gap_length, length - drawn)
                tr.forward(step)
                drawn += step
                tr.pendown()

tr.tracer(0, 0)
tr.speed(0)
tr.color("gray")

x1, y1 = map(int, input().split())
x2, y2 = map(int, input().split())
m = 20

tr.setup(width=abs(x1-x2)+2, height=abs(y1-y2)+2)
d = 2  # длина штриха

for i in range(x1, x2, m):
    dashed_segment(tr, ((i, y1), (i, y2)), d)

for i in range(y1, y2, m):
    dashed_segment(tr, ((x1, i), (x2, i)), d)

tr.done()
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