private Dictionary <PointInt, double> _getMoveRanks(double[,] map, KeyValuePair <WaterDrop, PointInt> drop)
{
var currentDropPosition = drop.Value;
var dropObj = drop.Key;
var moveRanks = new Dictionary <PointInt, double>();
foreach (var targetCell in _neighborsGetter(currentDropPosition))
{
if (!IsInMap(map, targetCell))
{
continue;
}
var heightDiff = GetHeight(map, currentDropPosition) - GetHeight(map, targetCell);
if (heightDiff < 0)
{
continue;
}
if (dropObj.Speed.Length > 0)
{
var targetSpeed = VectorExtension.CreateFromTwoPoints(currentDropPosition, targetCell);
var angle = dropObj.Speed.GetAngleWith(targetSpeed);
var factor = 0.5 * Math.Abs(angle);
moveRanks[targetCell] = heightDiff / factor;
}
else
{
var factor = Math.PI / 3; //TODO
moveRanks[targetCell] = heightDiff / factor;
}
}
return(moveRanks);
}
private static Vector CalculateSpeed(double[,] map, KeyValuePair <WaterDrop, PointInt> drop, KeyValuePair <PointInt, double> targetCell)
{
var scalarSpeed = GetHeight(map, drop.Value) - GetHeight(map, targetCell.Key);
var unitVectorSpeed = VectorExtension.CreateFromTwoPoints(drop.Value, targetCell.Key);
var speed = scalarSpeed * unitVectorSpeed;
return(speed + drop.Key.Speed);
}