public bool IsFree(int x, int y, int w, int h, Piece Ignore)
{
for (int i=x ; i<x+w ; ++i)
{
for (int j=y ; j<y+h ; ++j)
{
if (i < 0 || j < 0 || i >= m_iBlockCountX || j >= m_iBlockCountY
|| m_aBlock[i,j] && !Ignore.AtPos(i,j))
return false;
}
}
return true;
}