Tirsvad
a34bf6bbc2
Challenge 1 draws four sides and turns right 90 degrees after each. Challenge 2 puts the pen down for a dash and up for a gap and leaves it down at the end. Lengths and counts come from constants.py; invalid values raise ValueError. Task: MIL-002#3 Task: MIL-002#4 Task: MIL-002#5
41 lines
1.2 KiB
Python
41 lines
1.2 KiB
Python
"""!
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@file dashed_line.py
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@brief Turtle Challenge 2: draw a dashed line.
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"""
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from turtle_challenges.constants import DASH_COUNT, DASH_LENGTH, GAP_LENGTH
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from turtle_challenges.pen import Pen
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def draw_dashed_line(
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pen: Pen,
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dash_count: int = DASH_COUNT,
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dash_length: float = DASH_LENGTH,
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gap_length: float = GAP_LENGTH,
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) -> None:
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"""!
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@brief Draw a line of dashes: pen down for a dash, pen up for a gap.
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The pen is down again when the function returns, so that the caller can
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keep drawing.
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@param pen The turtle that draws.
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@param dash_count How many dashes to draw.
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@param dash_length Length of one dash, in turtle units.
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@param gap_length Length of the gap after each dash, in turtle units.
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@exception ValueError If @p dash_count is negative, or a length is not
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positive.
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"""
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if dash_count < 0:
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raise ValueError(f"dash_count must not be negative, got {dash_count}")
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if dash_length <= 0 or gap_length <= 0:
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raise ValueError(
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f"lengths must be positive, got dash {dash_length} and gap {gap_length}"
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)
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for _ in range(dash_count):
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pen.pendown()
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pen.forward(dash_length)
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pen.penup()
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pen.forward(gap_length)
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pen.pendown()
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