def index(self, indexer: Indexer):
"""Find interior angles on the same side from parallel relationship."""
ret = []
def find_alternate_angles(link_col, col1, col2, p1, p2):
p1_index = link_col.index(p1)
p2_index = link_col.index(p2)
reverse = lambda x: -1 if x == 0 else 0
compare = p1_index < p2_index
p1_direction = -1 if compare else 0
for k in [0, -1]:
if link_col[p1_direction] == p1 or col1[k] == p1:
continue
if link_col[reverse(p1_direction)] == p2 or col2[k] == p2:
continue
angle1 = indexer.index_angle_by_points(\
link_col[p1_direction], p1, col1[k])
angle2 = indexer.index_angle_by_points(\
link_col[reverse(p1_direction)], p2, col2[k])
a1_cond = indexer.index_value_condition(angle1, 'angle')
a2_cond = indexer.index_value_condition(angle2, 'angle')
if a1_cond.attr_value is None \
and a2_cond.attr_value is not None:
ret.append([[a2_cond], a1_cond])
elif a1_cond.attr_value is not None \
and a2_cond.attr_value is None:
ret.append([[a1_cond], a2_cond])
conds = indexer.index_by_type(Parallel)
for cond in conds:
r = cond.relationship
line1, line2 = r.line1, r.line2
# col is a list of point entity.
col1 = indexer.index_collineation_by_line(line1)
col2 = indexer.index_collineation_by_line(line2)
if r.reverse:
col2 = list(reversed(col2))
for p1 in col1:
for p2 in col2:
# Link line is the line links two parallel lines.
link_line = indexer.index_line_by_points(p1, p2)
# One link line can generate four corresponding angles at most.
if link_line is None:
continue
link_col = indexer.index_collineation_by_line(link_line)
find_alternate_angles(link_col, col1, col2, p1, p2)
return ret
def index(self, indexer: Indexer):
"""Find corresponding angles from parallel relationship."""
ret = []
def find_corresponding_angles(link_col, col1, col2, p1, p2):
for i in [0, -1]:
for j in [0, -1]:
if link_col[i] == p1 or col1[j] == p1:
continue
if link_col[i] == p2 or col2[j] == p2:
continue
angle1 = indexer.index_angle_by_points(\
link_col[i], p1, col1[j])
angle2 = indexer.index_angle_by_points(\
link_col[i], p2, col2[j])
a1_cond = indexer.index_value_condition(angle1, 'angle')
a2_cond = indexer.index_value_condition(angle2, 'angle')
if a1_cond.attr_value is None \
and a2_cond.attr_value is not None:
ret.append([[a2_cond], a1_cond])
elif a1_cond.attr_value is not None \
and a2_cond.attr_value is None:
ret.append([[a1_cond], a2_cond])
conds = indexer.index_by_type(Parallel)
for cond in conds:
r = cond.relationship
line1, line2 = r.line1, r.line2
# col is a list of point entity.
col1 = indexer.index_collineation_by_line(line1)
col2 = indexer.index_collineation_by_line(line2)
if r.reverse:
col2 = list(reversed(col2))
for p1 in col1:
for p2 in col2:
# Link line is the line links two parallel lines.
link_line = indexer.index_line_by_points(p1, p2)
# One link line can generate four corresponding angles at most.
if link_line is None:
continue
link_col = indexer.index_collineation_by_line(link_line)
find_corresponding_angles(link_col, col1, col2, p1, p2)
return ret
