Tirsvad
949d2edb63
200 steps of equal length, each in a random heading of 0, 90, 180 or 270 degrees and a random RGB color, with a thick line and the fastest speed. Task: MIL-004#1
50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
"""!
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@file random_walk.py
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@brief Turtle Challenge 4: generate a random walk.
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"""
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import random
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from turtle_challenges.colors import random_color
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from turtle_challenges.constants import (
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FASTEST_SPEED,
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WALK_HEADINGS,
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WALK_PEN_SIZE,
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WALK_STEP_DISTANCE,
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WALK_STEPS,
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)
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from turtle_challenges.pen import Pen
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def random_walk(
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pen: Pen,
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steps: int = WALK_STEPS,
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distance: float = WALK_STEP_DISTANCE,
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rng: random.Random | None = None,
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) -> None:
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"""!
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@brief Walk in random directions, changing color at every step.
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Each step faces east, north, west or south at random and moves the same
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distance in a new random RGB color.
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@param pen The turtle that draws.
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@param steps Number of steps to take.
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@param distance Distance of one step, in turtle units.
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@param rng Random generator for headings and colors; a shared one is used
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if omitted.
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@exception ValueError If @p steps is negative, or @p distance is not
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positive.
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"""
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if steps < 0:
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raise ValueError(f"steps must not be negative, got {steps}")
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if distance <= 0:
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raise ValueError(f"distance must be positive, got {distance}")
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generator = rng if rng is not None else random.Random()
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pen.pensize(WALK_PEN_SIZE)
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pen.speed(FASTEST_SPEED)
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for _ in range(steps):
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pen.color(random_color(generator))
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pen.setheading(generator.choice(WALK_HEADINGS))
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pen.forward(distance)
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