grid.py

from plot import Plot
import math

SQRT_2 = 1.41421356237

def rotate(x, y, angle):
    x -= 50
    y -= 50
    point = (
        x*math.cos(angle) - y*math.sin(angle),
        x*math.sin(angle) + y*math.cos(angle),
    )
    return (
        point[0]+50,
        point[1]+50,
    )

def main(p: Plot):
    p.plot_size = 8
    p.setup()
    p.draw_bounding_box()

    num_rows = 100
    num_cols = 100
    for r in range(num_rows+1):
        y = 1 + r * (98/num_rows)
        p.goto(*rotate(1, y, 0.4))
        for c in range(num_cols+1):
            x = 1 + c * (98/num_cols)
            p.lineto(*rotate(x, y, 0.4))

    for c in range(num_cols+1):
        x = 1 + c * (98/num_cols)
        p.goto(*rotate(x, 1, 0.4))
        for r in range(num_rows+1):
            y = 1 + r * (98/num_rows)
            p.lineto(*rotate(x, y, 0.4))