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# SPDX-License-Identifier: GPL-2.0-or-later
import bpy
import bmesh
from mathutils.geometry import intersect_line_line as LineIntersect
import itertools
from collections import defaultdict
from . import cad_module as cm
def order_points(edge, point_list):
''' order these edges from distance to v1, then
sandwich the sorted list with v1, v2 '''
v1, v2 = edge
def dist(co):
return (v1 - co).length
point_list = sorted(point_list, key=dist)
return [v1] + point_list + [v2]
def remove_permutations_that_share_a_vertex(bm, permutations):
''' Get useful Permutations '''
final_permutations = []
for edges in permutations:
raw_vert_indices = cm.vertex_indices_from_edges_tuple(bm, edges)
if cm.duplicates(raw_vert_indices):
continue
# reaches this point if they do not share.
final_permutations.append(edges)
return final_permutations
def get_valid_permutations(bm, edge_indices):
raw_permutations = itertools.permutations(edge_indices, 2)
permutations = [r for r in raw_permutations if r[0] < r[1]]
return remove_permutations_that_share_a_vertex(bm, permutations)
def can_skip(closest_points, vert_vectors):
'''this checks if the intersection lies on both edges, returns True
when criteria are not met, and thus this point can be skipped'''
if not closest_points:
return True
if not isinstance(closest_points[0].x, float):
return True
if cm.num_edges_point_lies_on(closest_points[0], vert_vectors) < 2:
return True
# if this distance is larger than than VTX_PRECISION, we can skip it.
cpa, cpb = closest_points
return (cpa - cpb).length > cm.CAD_prefs.VTX_PRECISION
def get_intersection_dictionary(bm, edge_indices):
bm.verts.ensure_lookup_table()
bm.edges.ensure_lookup_table()
permutations = get_valid_permutations(bm, edge_indices)
k = defaultdict(list)
d = defaultdict(list)
for edges in permutations:
raw_vert_indices = cm.vertex_indices_from_edges_tuple(bm, edges)
vert_vectors = cm.vectors_from_indices(bm, raw_vert_indices)
points = LineIntersect(*vert_vectors)
# some can be skipped. (NaN, None, not on both edges)
if can_skip(points, vert_vectors):
continue
# reaches this point only when an intersection happens on both edges.
[k[edge].append(points[0]) for edge in edges]
# k will contain a dict of edge indices and points found on those edges.
for edge_idx, unordered_points in k.items():
tv1, tv2 = bm.edges[edge_idx].verts
v1 = bm.verts[tv1.index].co
v2 = bm.verts[tv2.index].co
ordered_points = order_points((v1, v2), unordered_points)
d[edge_idx].extend(ordered_points)
return d
def update_mesh(bm, d):
''' Make new geometry (delete old first) '''
oe = bm.edges
ov = bm.verts
new_verts = []
collect = new_verts.extend
for old_edge, point_list in d.items():
num_edges_to_add = len(point_list)-1
for i in range(num_edges_to_add):
a = ov.new(point_list[i])
b = ov.new(point_list[i+1])
oe.new((a, b))
bm.normal_update()
collect([a, b])
bmesh.ops.delete(bm, geom=[edge for edge in bm.edges if edge.select], context='EDGES')
#bpy.ops.mesh.remove_doubles(
# threshold=cm.CAD_prefs.VTX_DOUBLES_THRSHLD,
# use_unselected=False)
bmesh.ops.remove_doubles(bm, verts=new_verts, dist=cm.CAD_prefs.VTX_DOUBLES_THRSHLD)
def unselect_nonintersecting(bm, d_edges, edge_indices):
if len(edge_indices) > len(d_edges):
reserved_edges = set(edge_indices) - set(d_edges)
for edge in reserved_edges:
bm.edges[edge].select = False
print("unselected {}, non intersecting edges".format(reserved_edges))
class TCIntersectAllEdges(bpy.types.Operator):
'''Adds a vertex at the intersections of all selected edges'''
bl_idname = 'tinycad.intersectall'
bl_label = 'XALL intersect all edges'
bl_options = {'REGISTER', 'UNDO'}
@classmethod
def poll(cls, context):
obj = context.active_object
return obj is not None and obj.type == 'MESH' and obj.mode == 'EDIT'
def execute(self, context):
# must force edge selection mode here
bpy.context.tool_settings.mesh_select_mode = (False, True, False)
obj = context.active_object
if obj.mode == "EDIT":
bm = bmesh.from_edit_mesh(obj.data)
selected_edges = [edge for edge in bm.edges if edge.select]
edge_indices = [i.index for i in selected_edges]
d = get_intersection_dictionary(bm, edge_indices)
unselect_nonintersecting(bm, d.keys(), edge_indices)
update_mesh(bm, d)
bmesh.update_edit_mesh(obj.data)
else:
print('must be in edit mode')
return {'FINISHED'}
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