public APoint(int value, bool ischecked, string name)
{
ValueMetka = value;
IsChecked = ischecked;
Name = name;
predPoint = new APoint();
}
/// <summary>
/// Поиск соседей для вершины. Для неориентированного графа ищутся все соседи.
/// </summary>
/// <param name="currpoint"></param>
/// <returns></returns>
private IEnumerable <APoint> Pred(APoint currpoint)
{
IEnumerable <APoint> firstpoints = from ff in rebra where ff.FirstPoint == currpoint select ff.SecondPoint;
IEnumerable <APoint> secondpoints = from sp in rebra where sp.SecondPoint == currpoint select sp.FirstPoint;
IEnumerable <APoint> totalpoints = firstpoints.Concat <APoint>(secondpoints);
return(totalpoints);
}
/// <summary>
/// Печать кратчайшего пути до заданной точки
/// </summary>
/// <param name="initp"></param>
/// <returns></returns>
public List <string> PrintPaths(APoint initp)
{
List <string> prlist = new List <string>();
foreach (APoint ap in points)
{
prlist.Add("От=" + ap.Name + "До=" + initp.Name + "Путь=" + MinPath(initp, ap));
}
return(prlist);
}
/// <summary>
/// Получаем ребро, соединяющее 2 входные точки
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
private Rebro GetMyRebro(APoint a, APoint b)
{//ищем ребро по 2 точкам
IEnumerable <Rebro> myr = from reb in rebra where (reb.FirstPoint == a & reb.SecondPoint == b) || (reb.SecondPoint == a & reb.FirstPoint == b) select reb;
if (myr.Count() > 1 || myr.Count() == 0)
{
throw new Exception("rebra...!");
}
else
{
return(myr.First());
}
}
/// <summary>
/// Получаем кратчайший путь в виде коллекции точек
/// </summary>
/// <param name="begin"></param>
/// <param name="end"></param>
/// <returns></returns>
public List <APoint> MinPath1(APoint begin, APoint end)
{
string s = string.Empty;
List <APoint> listOfpoints = new List <APoint>();
APoint tempp = new APoint();
tempp = end;
while (tempp != begin)
{
listOfpoints.Add(tempp);
tempp = GetPred(tempp);
}
return(listOfpoints);
}
/// <summary>
/// Печать минимального пути от начальной точки до некой входной
/// </summary>
/// <param name="begin"></param>
/// <param name="end"></param>
/// <returns></returns>
public string MinPath(APoint begin, APoint end)
{
string s = string.Empty;
APoint tempp = new APoint();
tempp = end;
while (tempp != begin)
{
s += " " + tempp.Name;
tempp = GetPred(tempp);
}
s += " " + tempp.Name;
return(s);
}
/// <summary>
/// Запуск алгоритма расчета
/// </summary>
/// <param name="beginp"></param>
public void AlgoritmRun(APoint beginp)
{
OneStep(beginp);
foreach (APoint point in points)
{
APoint anotherP = GetAnotherUncheckedPoint();
if (anotherP != null)
{
OneStep(anotherP);
}
else
{
break;
}
}
}
/// <summary>
/// Метод, делающий один шаг алгоритма. Принимает на вход вершину
/// </summary>
/// <param name="beginpoint"></param>
public void OneStep(APoint beginpoint)
{
foreach (APoint nextp in Pred(beginpoint))
{
if (nextp.IsChecked == false)//не отмечена
{
float newmetka = beginpoint.ValueMetka + GetMyRebro(nextp, beginpoint).Value;
if (nextp.ValueMetka > newmetka)
{
nextp.ValueMetka = newmetka;
nextp.predPoint = beginpoint;
}
else
{
}
}
}
beginpoint.IsChecked = true;//вычеркиваем
}
/// <summary>
/// Получаем очередную неотмеченную вершину, "ближайшую" к заданной.
/// </summary>
/// <returns></returns>
private APoint GetAnotherUncheckedPoint()
{
IEnumerable <APoint> pointsuncheck = from p in points where p.IsChecked == false select p;
if (pointsuncheck.Count() != 0)
{
float minVal = pointsuncheck.First().ValueMetka;
APoint minPoint = pointsuncheck.First();
foreach (APoint p in pointsuncheck)
{
if (p.ValueMetka < minVal)
{
minVal = p.ValueMetka;
minPoint = p;
}
}
return(minPoint);
}
else
{
return(null);
}
}
public APoint(int value, bool ischecked)
{
ValueMetka = value;
IsChecked = ischecked;
predPoint = new APoint();
}
/// <summary>
/// Получаем предка для вершины
/// </summary>
/// <param name="a"></param>
/// <returns></returns>
private APoint GetPred(APoint a)
{
return(points.Where(a1 => a1 == a).First().predPoint);
}
public Rebro(APoint first, APoint second, float value)
{
FirstPoint = first;
SecondPoint = second;
Value = value;
}