def draw_zebra_crossing(ctx,
frame: Polygon,
stripe_width: float = 0.04,
offset: float = 0.02):
"""Draw a zebra crossing in the given frame.
Args:
frame: Frame of the zebra crossing.
**Points of the frame must be given in the right order!**
first point : start on left line
second point: end on left line
third point : end on right line
fourth point: start on right line
"""
points = frame.get_points()
left = Line([points[0], points[3]])
right = Line([points[1], points[2]])
flag = True
min_length = min(left.length, right.length)
x = offset
while x < min_length:
l, r = left.interpolate(x), right.interpolate(x)
if flag:
ctx.move_to(l.x, l.y)
ctx.line_to(r.x, r.y)
flag = False
else:
ctx.line_to(r.x, r.y)
ctx.line_to(l.x, l.y)
ctx.close_path()
ctx.fill()
flag = True
x += stripe_width
def _get_stop_line(line1: Line, line2: Line, kind) -> SurfaceMarkingRect:
"""Return a line perpendicular to both provided (assumed parallel) lines.
The returned line will be at the first point where both lines are parallel to each other
plus 2cm offset.
"""
beginning_line1 = line1.interpolate(0.02)
beginning_line2 = line2.interpolate(0.02)
# Test which line to draw the stop line at
if beginning_line1.distance(line2) < beginning_line2.distance(line1):
# End of line 1 is the starting point of the stop line
p1 = beginning_line1
p2 = line2.interpolate(line2.project(beginning_line1))
else:
# End of line 2 is the starting point
p1 = line1.interpolate(line1.project(beginning_line2))
p2 = beginning_line2
line = Line([p1, p2])
width = line.length
center = 0.5 * (Vector(line.coords[0]) + Vector(line.coords[1]))
angle = line1.interpolate_direction(arc_length=0).argument
return SurfaceMarkingRect(kind,
*center.xy,
angle=angle,
width=width,
normalize_x=False,
depth=0.04)
def draw_start_lane(ctx, frame: Polygon):
"""Draw the checkerboard pattern to mark the beginning of a parking area in the given
frame.
Args:
frame: Frame of the start lane.
**Points of the frame must be given in the right order!**
first point : start on left line
second point: end on left line
third point : end on right line
fourth point: start on right line
"""
TILE_LENGTH = 0.02
points = frame.get_points()
left = Line([points[0], points[1]])
right = Line([points[3], points[2]])
for i in range(3):
utils.draw_line(
ctx,
MarkedLine(
[
left.interpolate(TILE_LENGTH * (i + 0.5)),
right.interpolate(TILE_LENGTH * (i + 0.5)),
],
style=RoadSection.DASHED_LINE_MARKING,
prev_length=(i % 2 + 0.5) * TILE_LENGTH,
),
dash_length=TILE_LENGTH,
)
def draw_start_lane(ctx, frame: Polygon):
TILE_LENGTH = 0.02
points = frame.get_points()
left = Line([points[0], points[1]])
right = Line([points[3], points[2]])
for i in range(3):
utils.draw_line(
ctx,
MarkedLine(
[
left.interpolate(TILE_LENGTH * (i + 0.5)),
right.interpolate(TILE_LENGTH * (i + 0.5)),
],
style=RoadSection.DASHED_LINE_MARKING,
prev_length=(i % 2 + 0.5) * TILE_LENGTH,
),
dash_length=TILE_LENGTH,
)
def draw_zebra_crossing(ctx,
frame: Polygon,
stripe_width: float = 0.04,
offset: float = 0.02):
points = frame.get_points()
left = Line([points[0], points[3]])
right = Line([points[1], points[2]])
flag = True
min_length = min(left.length, right.length)
x = offset
while x < min_length:
l, r = left.interpolate(x), right.interpolate(x)
if flag:
ctx.move_to(l.x, l.y)
ctx.line_to(r.x, r.y)
flag = False
else:
ctx.line_to(r.x, r.y)
ctx.line_to(l.x, l.y)
ctx.close_path()
ctx.fill()
flag = True
x += stripe_width