x_offset

[Graham]

Thanks for the reply, when I ran the code I got the error message

Traceback (most recent call last):
  File "shapes.py", line 46, in <module>
    pg.draw.line(self.screen, pg.Color("red"), start, end, 1)
NameError: name 'pg' is not defined

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All sorted used this code

    for y_offset in range(0, 100, 10):
        pygame.draw.line(screen, PURPLE, [0, 160 + y_offset], [190-y_offset, 160 + y_offset], 5)

To get this result,

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After a bit more thought, this;