bool
Skin::correct_face(Bface* f, bool& changed)
{
//
// BBBBBBBBBBBBBBB
// B /|
// B / |
// B f / | Change this, where quad face f
// B / | is adjacent to 2 boundary edgees...
// B / |
// B / |
// B/- - - - - - o
//
// BBBBBBBBBBBBBBB
// B\ |
// B \ |
// B \ | ... to this, where neither face of
// B \ | the quad is adjacent to more than 1
// B \ | boundary edge.
// B \ |
// B - - - - - - o
//
assert(f);
// boundary edges have flag == 1, others have flag == 0
uint n = num_edge_flags_set(f);
if (n < 2) return true; // not a problem
if (n > 2) {
// unfixable problem
err_adv(debug, " can't fix face with %d boundary edges", n);
return false;
}
// 2 boundary edges; get the non-boundary one:
Bedge* e = boundary_connector(f);
assert(e);
// we want to swap it; only possible if it has 2 faces:
if (e->nfaces() != 2) {
err_adv(debug, " can't fix edge with %d faces", e->nfaces());
return false;
}
// swapping won't do any good if its other face has boundary edges too:
if (!(num_edge_flags_set(e->f1()) == 0 || num_edge_flags_set(e->f2()) == 0)) {
err_adv(debug, " unfixable edge found, giving up");
return false;
}
// try to swap it:
if (e->do_swap()) {
err_adv(debug, " swapped edge");
return changed = true;
}
err_adv(debug, " edge swap failed");
return false;
}
UVpt
LoopUV::centroid(CLvert* v) const
{
assert(v);
switch (UVdata::discontinuity_degree(v)) {
case 0:
{
// No discontinuity:
UVpt ret;
for (int i=0; i<v->degree(); i++)
ret += UVdata::get_uv(v->nbr(i), v->e(i)->get_face());
return ret / v->degree();
}
case 2:
{
// Find the 2 discontinuity edges and get the uv values of
// their opposite vertices that agree with the current vertex.
CUVpt& uv = UVdata::get_uv(v,_face);
UVpt ret;
for (int i=0; i<v->degree(); i++) {
Bedge* e = v->e(i);
if (!UVdata::is_continuous(e)) {
if (UVdata::lookup(e->f1()) && UVdata::get_uv(v,e->f1()) == uv)
ret += UVdata::get_uv(v->nbr(i), e->f1());
else if (UVdata::lookup(e->f2()) &&
UVdata::get_uv(v,e->f2()) == uv)
ret += UVdata::get_uv(v->nbr(i), e->f2());
else
assert(0);
}
}
return ret/2;
}
default:
// Treat as a corner vertex
return UVdata::get_uv(v, _face);
}
}
int
SELECT_WIDGET:: slash_cb(CGESTUREptr& gest, DrawState*& s)
{
if (_mode==SEL_FACE) //widget is in face selection mode
{
select_list.clear();
Bface* f = find_face(gest->start(),0.25,MIN_PIX_AREA);
// f should be the currently selected face
if (f && f->is_selected() && f->is_quad())
{
f=f->quad_rep();
//line in screen space coresponding to the slash
PIXELline slash(gest->start(),gest->end());
Bedge *e1,*e2,*e3,*e4;
Bedge* edge = 0;
//get and test the quad edges against the stroke line
f->get_quad_edges(e1,e2,e3,e4);
if( e1->pix_line().intersect_segs(slash) )
{
edge=e1;
}
else
if( e2->pix_line().intersect_segs(slash) )
{
edge=e2;
}
else
if( e3->pix_line().intersect_segs(slash) )
{
edge=e3;
}
else
if( e4->pix_line().intersect_segs(slash) )
{
edge=e4;
}
else
{
//error
cerr << "ERROR no intersection" << endl;
return 1;
}
//walk the geometry and select faces
Bface* fn = f;
do
{
if (!fn->is_selected())
select_list +=fn;
assert(edge); //I'm paranoid too
assert(edge->f1()!=edge->f2());
//grabs the face on the other side of the edge
//even if we are not directly adjacent to this edge
fn=fn->other_quad_face(edge);
if (fn) //if a valid face than advance the edge pointer
{
assert(edge!=fn->opposite_quad_edge(edge));
edge = fn->opposite_quad_edge(edge);
fn = fn->quad_rep(); //all faces on the selection list are rep faces
}
else
cerr << "No face on the other side of the edge" << endl;
} //quit if not a valid face or not a quad
while(fn&&(fn->is_quad())&&edge&&(fn!=f));
_mode=SLASH_SEL; //go into pattern editing mode
end_face=0; //prepare the 2nd step data
pattern=0;
for (int i=0; i<MAX_PATTERN_SIZE; i++)
pattern_array[i]=1; //fill the default pattern with ones
}
else
cerr << "This is not a quad" << endl;
}
else
if( _mode==SLASH_SEL)//pattern editing mode
{ //activates upon second slash motion
//adds the entire list to the selected group
//undo deselects the entire group
Bface_list final_list;
//copy the face pointers to the final list
//using the pattern as a repeating template
//and stop at the end face
for (int i = 0; i<(end_face ? (end_face) : select_list.num()) ; i++)
{
if (pattern ? pattern_array[(i%pattern)+1] : 1)
final_list+=select_list[i];
}
WORLD::add_command(new MESH_SELECT_CMD(final_list));
return cancel_cb(gest,s);
}
else
cerr << "wrong mode " << endl;
return 1;
}
