def _draw_circle_segment(
self,
dr: svgwrite.Drawing,
tracks: List[Track],
a1: float,
a2: float,
rr: ValueRange,
center: XY,
):
length = sum([t.length for t in tracks])
has_special = len([t for t in tracks if t.special]) > 0
color = self.color(self.poster.length_range_by_date, length, has_special)
r1 = rr.lower()
r2 = (
rr.lower()
+ rr.diameter() * length / self.poster.length_range_by_date.upper()
)
sin_a1, cos_a1 = math.sin(a1), math.cos(a1)
sin_a2, cos_a2 = math.sin(a2), math.cos(a2)
path = dr.path(
d=("M", center.x + r1 * sin_a1, center.y - r1 * cos_a1),
fill=color,
stroke="none",
)
path.push("l", (r2 - r1) * sin_a1, (r1 - r2) * cos_a1)
path.push(f"a{r2},{r2} 0 0,0 {r2 * (sin_a2 - sin_a1)},{r2 * (cos_a1 - cos_a2)}")
path.push("l", (r1 - r2) * sin_a2, (r2 - r1) * cos_a2)
dr.add(path)
def color(self,
length_range: ValueRange,
length: float,
is_special: bool = False) -> str:
assert length_range.is_valid()
assert length_range.contains(length)
color1 = (self.poster.colors["special"]
if is_special else self.poster.colors["track"])
color2 = (self.poster.colors["special2"]
if is_special else self.poster.colors["track2"])
diff = length_range.diameter()
if diff == 0:
return color1
return utils.interpolate_color(color1, color2,
(length - length_range.lower()) / diff)
def _draw_rings(self, dr: svgwrite.Drawing, center: XY, radius_range: ValueRange):
length_range = self.poster.length_range_by_date
ring_distance = self._determine_ring_distance()
if ring_distance is None:
return
distance = ring_distance
while distance < length_range.upper():
radius = (
radius_range.lower()
+ radius_range.diameter() * distance / length_range.upper()
)
dr.add(
dr.circle(
center=center.tuple(),
r=radius,
stroke=self._ring_color,
stroke_opacity="0.2",
fill="none",
stroke_width=0.3,
)
)
distance += ring_distance