public void StepBack()
{
/// Stepback(Undo) only happens when:
/// 1.There is no unfolding going on
/// 2.This is the first time of folding back.
/// 3.The Unfolding arry isn't empty.
if (!unfolding && !HasFoldedBack && PreviousUnfoldingA.ToArray().Length != 0)
{
// If an unfolding happened before, we need to fold back.
if (PreviousUnfoldingA[0] || PreviousUnfoldingB[0])
{
if (PreviousStartingPoint.ToArray().Length == 2)
{
RecoverLineInfo(PreviousStartingPoint[0], PreviousEndingPoint[0]);
meshGenerator.ReCreateLine(PreviousStartingPoint[0], PreviousEndingPoint[0]);
logtool.LineRevert(PreviousStartingPoint[0], PreviousEndingPoint[0]);
RecoverLineInfo(PreviousStartingPoint[1], PreviousEndingPoint[1]);
if (PreviousUnfoldingA[0])
{
Vector3 ckMidPoint = (PreviousStartingPoint[0] + PreviousEndingPoint[0]) / 2;
// Vector3 rmMidPoint = (PreviousStartingPoint[1] + PreviousEndingPoint[1]) / 2;
FoldingBack(ckMidPoint, PreviousStartingPoint[1], PreviousEndingPoint[1], 0, PreviousStartingNormalA[0]);
}
if (PreviousUnfoldingB[0])
{
Vector3 ckMidPoint = (PreviousStartingPoint[0] + PreviousEndingPoint[0]) / 2;
// Vector3 rmMidPoint = (PreviousStartingPoint[1] + PreviousEndingPoint[1]) / 2;
FoldingBack(ckMidPoint, PreviousStartingPoint[1], PreviousEndingPoint[1], 1, PreviousStartingNormalB[0]);
}
}
else
{
// TODO: We still need to consider the situation that unfolding happens sequentially.
}
}
// If there is no unfolding happened before, then we only need to recreate the previous line.
else
{
RecoverLineInfo(PreviousStartingPoint[0], PreviousEndingPoint[0]);
meshGenerator.ReCreateLine(PreviousStartingPoint[0], PreviousEndingPoint[0]);
logtool.LineRevert(PreviousStartingPoint[0], PreviousEndingPoint[0]);
}
HasFoldedBack = true;
}
}