def _generate_mesh(way: Way) -> Geom:
"""Generate mesh for a Way."""
geometry = way.geometry
rows = 2 * len(geometry.segments) + 2
vertex_data = GeomVertexData(str(way.id), VERTEX_FORMAT, Geom.UH_static)
vertex_data.set_num_rows(rows)
vertex_writer = GeomVertexWriter(vertex_data, 'vertex')
normal_writer = GeomVertexWriter(vertex_data, 'normal')
texcoord_writer = GeomVertexWriter(vertex_data, 'texcoord')
start_z = way.start.level * LEVEL_HEIGHT
end_z = way.end.level * LEVEL_HEIGHT
lanes_float = float(way.total_lane_count)
segment = geometry.segments[0]
for vertex in (segment.start_left, segment.start_right):
vertex_writer.add_data3f(vertex.x, vertex.y, start_z)
normal_writer.add_data3f(0.0, 0.0, 1.0)
texture_v = 0.0
texcoord_writer.add_data2f(0.0, texture_v)
texcoord_writer.add_data2f(lanes_float, texture_v)
lengths = [s.length() for s in geometry.segments]
total_len = sum(lengths)
for segment, acc_len in zip(geometry.segments, accumulate(lengths)):
height = start_z + (end_z - start_z) * acc_len / total_len
for vertex in (segment.end_left, segment.end_right):
vertex_writer.add_data3f(vertex.x, vertex.y, height)
normal_writer.add_data3f(0.0, 0.0, 1.0)
texture_v = acc_len / LANE_WIDTH
texcoord_writer.add_data2f(0.0, texture_v)
texcoord_writer.add_data2f(lanes_float, texture_v)
primitive = GeomTristrips(Geom.UH_static)
primitive.add_consecutive_vertices(0, rows)
primitive.close_primitive()
geom = Geom(vertex_data)
geom.add_primitive(primitive)
return geom
def _generate_mesh(points: List[Point]) -> Geom:
"""Generate mesh for a Path."""
def calc_color(param):
return interpolate_rgb(START_COLOR, END_COLOR, param)
if len(points) < 2:
return Geom()
vertex_data = GeomVertexData('path', VERTEX_FORMAT, Geom.UH_static)
vertex_data.set_num_rows(2 * len(points) + 1)
vertex_writer = GeomVertexWriter(vertex_data, 'vertex')
normal_writer = GeomVertexWriter(vertex_data, 'normal')
color_writer = GeomVertexWriter(vertex_data, 'color')
length = sum(p1.distance(p2) for p1, p2 in window_iter(points))
vector = points[1] - points[0]
distance = vector.norm()
position = distance / length
vector = vector.normalized()
width_vector = LANE_WIDTH * 0.5 * vector.rotated_left()
for vertex in (points[0] + width_vector, points[0] - width_vector):
vertex_writer.add_data3f(vertex.x, vertex.y, HEIGHT)
normal_writer.add_data3f(0.0, 0.0, 1.0)
color_writer.add_data4f(*START_COLOR)
last_vector = vector
for point, next_ in zip(islice(points, 1, None), islice(points, 2, None)):
vector = next_ - point
distance = vector.norm()
vector = vector.normalized()
try:
bisector = (last_vector + vector).normalized()
width_vector = (sec(bisector, vector) * 0.5 * LANE_WIDTH
* bisector.rotated_left())
except ZeroDivisionError:
width_vector = vector.rotated_right() * 0.5 * LANE_WIDTH
color = calc_color(position)
for vertex in (point + width_vector, point - width_vector):
vertex_writer.add_data3f(vertex.x, vertex.y, HEIGHT)
normal_writer.add_data3f(0.0, 0.0, 1.0)
color_writer.add_data4f(*color)
position = position + distance / length
last_vector = vector
point = points[-1]
width_vector = 0.5 * LANE_WIDTH * last_vector.rotated_left()
distance = LANE_WIDTH if distance > LANE_WIDTH else distance / 2
vector = -last_vector * distance
for vertex in (point + width_vector + vector,
point - width_vector + vector,
point):
vertex_writer.add_data3f(vertex.x, vertex.y, HEIGHT)
normal_writer.add_data3f(0.0, 0.0, 1.0)
color_writer.add_data4f(*END_COLOR)
primitive = GeomTristrips(Geom.UH_static)
primitive.add_consecutive_vertices(0, 2 * len(points) + 1)
primitive.close_primitive()
geom = Geom(vertex_data)
geom.add_primitive(primitive)
return geom
