public void UndoRemove() //撤销操作，向前，即恢复到后面的操作
{
if (mCurOperator == -1) //已经回溯到最初始的状态了，不能继续回溯了
{
return;
}
RemoveOperatorRecord ror = mLstRemoveOperatorRecords[mCurOperator];
//插入当前操作记录中删除的面片
LstPatches.Add(ror.Removed);
ror.Removed.IncreVDegree(); //顶点度数都增1
//修改当前顶点数量
CurVNum -= ror.VNumAdded;
Patch cur = null;
Patch bak = null;
Patch patchTemp = new Patch(this);
int nNBNum = ror.LstNeighborBak.Count;
for (int i = 0; i < nNBNum; i++)
{
cur = ror.LstNeighborBak[i].PatchCur;
bak = ror.LstNeighborBak[i].PatchBak;
patchTemp.Set(cur);
cur.Set(bak);
bak.Set(patchTemp);
}
mCurOperator--; //前移一步
mCurLeastErrorPatch = ror.Removed; //修改当前误差最小面片
}
public void RedoRemove() //撤销操作，向后，即回溯到以前的操作
{
int RemOprCount = mLstRemoveOperatorRecords.Count;
if (mCurOperator == RemOprCount - 1) //已经是最后一个操作了，不能再往前恢复了
{
return;
}
RemoveOperatorRecord ror = mLstRemoveOperatorRecords[mCurOperator + 1];
//再一次删除当前操作记录中删除的面片，因为前面的恢复过程已经将其插入了
//注意：该面片应该是被插入在整个listpatch的最后！因为前面的恢复操作，将其插入到尾部了。
//这样，就可以避免再作一次遍历寻找！
Patch ptail = LstPatches[LstPatches.Count - 1];
LstPatches.RemoveAt(LstPatches.Count - 1);
ror.Removed.DecreVDegree(); //顶点度数都减1
//修改当前顶点数量
CurVNum += ror.VNumAdded;
Patch cur = null;
Patch bak = null;
Patch patchTemp = new Patch(this);
int nNBNum = ror.LstNeighborBak.Count;
for (int i = 0; i < nNBNum; i++)
{
cur = ror.LstNeighborBak[i].PatchCur;
bak = ror.LstNeighborBak[i].PatchBak;
patchTemp.Set(cur);
cur.Set(bak);
bak.Set(patchTemp);
}
mCurOperator++; //前移一步
if (mCurOperator == RemOprCount - 1) //后移一步后变成了最后一个操作
{
SearchLeastErrorPatch(); //此时要重新计算最小误差面片
}
else
{
mCurLeastErrorPatch = mLstRemoveOperatorRecords[mCurOperator + 1].Removed; //修改当前误差最小面片
}
}
protected bool RemovePatch(Patch pat) //删除一个面片
{
RemoveOperatorRecord ror = new RemoveOperatorRecord();
ror.Removed = pat;
ror.LstNeighborBak = new List <NeighborBak>();
//将邻域面片复制并保存好
Patch bakNP = null;
Patch curNP = null;
List <VPNeighbor> lstNeighbors = pat.LstNeighbors;
int nbsize = lstNeighbors.Count;
int i;
for (i = 0; i < nbsize; i++)
{
curNP = lstNeighbors[i].NeighborPatch;
bakNP = new Patch(curNP); //复制给patchNeighborBak
//由于要考虑撤销和恢复操作，因此这里似乎不能直接添加到最后！
//而应改为：将mCurOperator游标其后的所有删除操作删除
//然后再添加到最后的位置！
ror.LstNeighborBak.Add(new NeighborBak(curNP, bakNP));
}
if (pat.Removed()) //删除成功
{
//移除当前面片
int pos = LstPatches.IndexOf(pat);
if (pos != -1)
{
LstPatches.RemoveAt(pos);
}
//记录下来增加的顶点数
ror.VNumAdded = LstVertecies.Count - CurVNum;
CurVNum = LstVertecies.Count;
//备份操作！
mLstRemoveOperatorRecords.Add(ror);
mCurOperator++;
return(true);
}
return(false);
}