/**

* 挑出传入的所有点中重复的点~

*/

- (vector<b2Vec2>*)selectDuplicatedVertices:(vector<vector<b2Vec2>*>*)allVertices {

vector<b2Vec2> *target = new vector<b2Vec2>();

for(uint i = 0; i < allVertices->size(); ++ i) {

vector<b2Vec2> *poly = allVertices->at(i);

for(uint j = i + 1; j < allVertices->size(); ++ j) {

vector<b2Vec2> *beCompared = allVertices->at(j);

b2Vec2 vA;

b2Vec2 vB;

int counter = 0;

for(uint k = 0; k < poly->size(); ++ k) {

b2Vec2 m = poly->at(k);

for(uint l = 0; l < beCompared->size(); ++ l) {

b2Vec2 n = beCompared->at(l);

if((m.x == n.x && m.y == n.y) ||

(m.x <= n.x+_floatErrorRange && m.x >= n.x-_floatErrorRange &&

m.y <= n.y+_floatErrorRange && m.y >= n.y-_floatErrorRange))

{

if(counter >=2) {

break;

}

if(counter ==0) {

vA =b2Vec2(m.x,m.y);

}else {

vB =b2Vec2(m.x,m.y);

}

counter +=1;

}

}

}

if(counter == 2) {

target->push_back(vA);

target->push_back(vB);

}

}

}

return target;

}