Tirsvad
32861fc58f
draw_shape turns 360 divided by the number of sides after each side and rejects fewer than 3 sides. draw_shapes draws a triangle up to a decagon, each in a color from the palette. Task: MIL-003#3 Task: MIL-003#4 Task: MIL-003#5
57 lines
1.7 KiB
Python
57 lines
1.7 KiB
Python
"""!
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@file shapes.py
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@brief Turtle Challenge 3: draw different shapes, each in a random color.
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"""
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import random
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from turtle_challenges.colors import random_palette_color
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from turtle_challenges.constants import (
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FULL_TURN_DEGREES,
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MAX_POLYGON_SIDES,
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MIN_POLYGON_SIDES,
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POLYGON_SIDE_LENGTH,
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)
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from turtle_challenges.pen import Pen
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def draw_shape(
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pen: Pen, num_sides: int, side_length: float = POLYGON_SIDE_LENGTH
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) -> None:
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"""!
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@brief Draw a regular polygon.
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The turtle turns 360 divided by the number of sides after each side, so
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five sides turn 72 degrees and the shape closes after one lap.
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@param pen The turtle that draws.
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@param num_sides Number of sides; at least 3.
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@param side_length Length of each side, in turtle units.
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@exception ValueError If @p num_sides is below 3, or @p side_length is not
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positive.
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"""
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if num_sides < MIN_POLYGON_SIDES:
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raise ValueError(
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f"num_sides must be at least {MIN_POLYGON_SIDES}, got {num_sides}"
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)
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if side_length <= 0:
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raise ValueError(f"side_length must be positive, got {side_length}")
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angle = FULL_TURN_DEGREES / num_sides
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for _ in range(num_sides):
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pen.forward(side_length)
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pen.right(angle)
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def draw_shapes(pen: Pen, rng: random.Random | None = None) -> None:
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"""!
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@brief Draw a triangle, square, pentagon and so on up to a decagon.
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Each shape gets a random color from the palette.
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@param pen The turtle that draws.
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@param rng Random generator for the colors; a shared one is used if omitted.
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"""
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for num_sides in range(MIN_POLYGON_SIDES, MAX_POLYGON_SIDES + 1):
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pen.color(random_palette_color(rng))
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draw_shape(pen, num_sides)
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