How can turtle be used to fill polygons with hatch lines?

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One way to fill polygons with hatch lines using the turtle module in Python is to use a loop to iterate over the vertices of the polygon and draw diagonal lines inside it.

Here's an example code:

import turtle

# create a turtle object
t = turtle.Turtle()

# define the vertices of the polygon
vertices = [(0, 0), (200, 0), (200, 200), (0, 200)]

# draw the outline of the polygon
for v in vertices:
    t.goto(v)
t.goto(vertices[0])

# fill the polygon with hatch lines
t.begin_fill()
for x in range(0, 200):
    for v in vertices:
        t.goto(v)
        t.setheading(t.towards((v[0], x)))
        t.forward(x)
t.end_fill()

# hide the turtle object
t.hideturtle()

# get the window to stay open until closed manually
turtle.mainloop()

In this code, the vertices of the polygon are defined and the turtle object is used to draw the outline of it. Then, a loop is used to draw diagonal lines inside the polygon to fill it with hatch lines. Finally, the turtle object is hidden and the window is kept open until closed manually.