void
EdgeStrip::build_ccw_boundaries(
CBedge_list& edges,
CSimplexFilter& face_filter
)
{
// Similar to previous...
//
// XXX - needs comments
// Clear edge flags to screen for unreached edges:
// set edge flags to 1 in 1-ring of verts,
// then clear edge flags of internal edges
set_adjacent_edges(edges.get_verts(), 1);
edges.clear_flags();
// get an edge filter that accepts "boundary" edges WRT the
// given face filter
BoundaryEdgeFilter boundary(face_filter);
// Pull out the edge tips:
Bedge_list tips = edges.filter(ChainTipEdgeFilter(boundary));
// Construct the filter that screens out previously reached
// edges:
UnreachedSimplexFilter unreached;
AndFilter wanted = unreached + boundary;
int k;
// Start from all the tips first:
for (k=0; k<tips.num(); k++) {
Bedge* e = tips[k];
Bvert* v = (e->v2()->degree(boundary) != 2) ? e->v2() : e->v1();
Bface* f = e->screen_face(face_filter);
assert(f); // e must have 1 face satisfying the filter
// If this will start out running ccw, take it.
// otherwise skip:
if (f->next_vert_ccw(v) == e->other_vertex(v))
build(v, e, wanted);
}
// Now check the rest:
for (k=0; k<edges.num(); k++) {
Bedge* e = edges[k];
Bface* f = e->screen_face(face_filter);
assert(f); // e must have 1 face satisfying the filter
// Go CCW around faces
build(f->leading_vert_ccw(e), e, wanted);
}
}
bool
SELECT_WIDGET::select_edges(CPIXEL_list& pts)
{
err_adv(debug, "SELECT_WIDGET::select_edges:");
if (pts.num() < 2) {
err_adv(debug, " bad gesture: %d points", pts.num());
return false;
}
// Find edit-level vert near start of pixel trail:
Bvert* v = find_vert(pts[0]);
if (!v) {
err_adv(debug, " can't get starter vertex");
return false;
}
// 2. Extract edge sequence within tolerance of gest
Bedge_list chain;
int k = 0; // index of cur position in gesture
Bvert* cur = v; // current vertex
Bedge* e = 0;
while ((e = match_span(cur, pts, k))) {
if(!e->is_selected()) chain += e;
cur = e->other_vertex(cur);
}
err_adv(debug, " got %d edges", chain.num());
// Confirm gest is sufficiently close to edge chain
// 3. Select the edges
WORLD::add_command(new MESH_SELECT_CMD(chain));
return true;
}
// Like above, but returns the next border vertex:
Bvert* next_border_vert_cw() {
Bedge* border = next_border_edge_cw();
return border ? border->other_vertex(this) : nullptr;
}
