/// <summary>
/// Initializes a new instance of the <see cref="Simulation" /> class.
/// </summary>
/// <param name="teams">The teams to be played against each other.</param>
/// <param name="ball">The ball.</param>
/// <param name="pitchBounds">The pitch boundaries.</param>
/// <param name="friction">The friction coefficient.</param>
public Simulation(ReadOnlyCollection<Team> teams, PointMass ball, RectangleF pitchBounds, float friction)
{
Contract.Requires<ArgumentNullException>(teams != null);
Contract.Requires<ArgumentNullException>(ball != null);
Contract.Requires<ArgumentException>(friction >= 0);
Contract.Requires<ArgumentException>(pitchBounds.Width > 0 && pitchBounds.Height > 0);
Contract.Requires<ArgumentException>(Contract.ForAll(teams, t =>
t != null &&
pitchBounds.IntersectsOrBorders(t.GoalBounds) &&
t.Players.All(p => pitchBounds.Contains(p.Position))));
Contract.Requires<ArgumentException>(pitchBounds.Contains(ball.Position));
_simulate = SimulatePlaying;
_teams = teams;
_startingPositions = (from t in teams select (from p in t.Players select p.Position).ToList().AsReadOnly()).ToList().AsReadOnly();
_ball = ball;
_ballStartingPosition = ball.Position;
PitchBounds = pitchBounds;
Friction = friction;
}
public bool IsValid(RectangleF pitchBounds)
=>
pitchBounds.IntersectsOrBorders(GoalBounds) &&
Players.All(p => pitchBounds.Contains(p.Position));
