private void RepositionEntity(XEntity xe)
{
int newX = -1;
int newY = -1;
do
{
var direction = HelperMethods.GetRandomDirection(xe);
switch (direction)
{
case MovementDirection.UP:
case MovementDirection.DOWN:
newY = GetValidVertical(xe.Y, direction);
newX = xe.X;
break;
case MovementDirection.RIGHT:
case MovementDirection.LEFT:
newX = GetValidHorisental(xe.X, direction);
newY = xe.Y;
break;
}
}
// If new point equals prev point.. need to get new posision
while (newX == xe.PrevPoint.X && newY == xe.PrevPoint.Y);
// Save current to prev point
xe.PrevPoint = new Point(xe.X, xe.Y);
// reposition entity with the new point
xe.X = newX;
xe.Y = newY;
}
internal static MovementDirection GetRandomDirection(XEntity xe)
{
int r = rnd.Next(1, 5);
var dir = (MovementDirection)r;
return(dir);
}
/// <summary>
/// // Update the history track list and remove the last extra step if the list exceeded the number of his steps the user selected
/// </summary>
/// <param name="xe"></param>
private void SaveTrackHistory(XEntity xe)
{
// Insert new point at index zero.
xe.HistoryTrack.Insert(0, new Point(xe.X, xe.Y));
// if the length of the list is greater the intended, go ahead and remove extras.
if (xe.HistoryTrack.Count > _board.HisNumberOfSteps)
{
// Start index to remove at is the HisNumberOfSteps. The list is zero based, so the HisNumberOfSteps indecates the extra start index.
int startInx = _board.HisNumberOfSteps;
// The raeng count of extras to remove.
int range = xe.HistoryTrack.Count - _board.HisNumberOfSteps;
// remove range
xe.HistoryTrack.RemoveRange(startInx, range);
}
}