private void UpdateRunnerProfits()
{
var totalIfLose = Runners.Sum(r => r.Value.IfLose);
foreach (var(_, runner) in Runners)
{
runner.Profit =
Math.Round(
runner.IfWin + totalIfLose - runner.IfLose, 2);
}
}
/// <summary>
/// Calculating winner according this algorythm
/// https://en.wikipedia.org/wiki/Alias_method and
/// http://code.activestate.com/recipes/576564-walkers-alias-method-for-random-objects-with-diffe/
/// </summary>
/// <returns></returns>
public Runner CalculateWinner()
{
double sumOfAllChances = Runners.Sum(x => x.Chance(Margin));
double sumU = Math.Ceiling(sumOfAllChances);
var pick = rnd.Next((int)sumU);
double sum = 0;
Runner res = new Runner();
foreach (var item in Runners)
{
sum += item.Chance(Margin);
if (sum >= pick)
{
res = item;
Runners[Runners.IndexOf(res)].winCount++;
break;
}
}
return(res);
}
private void CalculateMargin()
{
Margin = Runners.Sum(x => x.DecimalPrice);
}
/// <summary>
/// Calculates the race margin for the <see cref="Runners"/>.
/// </summary>
private void ReCalculateRaceMargin()
{
_raceMargin = Math.Round(Runners.Sum(r => r.GetMargin()), 2);
OnPropertyChanged(nameof(RaceMargin));
EvaluateCanRunRace();
}