/// <summary>
/// This method causes an entity to move a certain distance away from the
/// center of the toEntity.
/// </summary>
/// <param name="toEntity">Entity to move to.</param>
/// <param name="distance">Distance to move away.</param>
public virtual void MoveDistanceInFrontOfEntity(GameEntitity toEntity, int distance)
{
if (toEntity == null)
return;
Vector2 targetPos = Vector2.Add(toEntity.m_WorldPosition, toEntity.m_EntityCenter);
DIRECTION movementDir;
FaceEntity(toEntity);
m_MovementDelta.X = 0;
m_MovementDelta.Y = 0;
if (m_WorldPosition.Y < targetPos.Y)
{
movementDir = DIRECTION.DOWN;
m_MovementDelta.X = 0;
m_MovementDelta.Y = 1;
targetPos.Y -= distance;
//targetPos.Y -= m_SpriteSize.Y / 2;
if (m_WorldPosition.X < targetPos.X)
{
movementDir = DIRECTION.DOWN_RIGHT;
m_MovementDelta.X = 1;
targetPos.X -= distance;
targetPos.X -= m_SpriteSize.X;
}
else if (m_WorldPosition.X > targetPos.X)
{
movementDir = DIRECTION.DOWN_LEFT;
m_MovementDelta.X = -1;
targetPos.X += distance;
//targetPos.X += m_SpriteSize.X / 8;
}
}
else if (m_WorldPosition.Y == targetPos.Y)
{
movementDir = m_EntityDircetion;
m_MovementDelta.X = 0;
m_MovementDelta.Y = 0;
if (m_WorldPosition.X < targetPos.X)
{
movementDir = DIRECTION.RIGHT;
m_MovementDelta.X = 1;
targetPos.X -= distance;
targetPos.X -= m_SpriteSize.X;
}
else if (m_WorldPosition.X > targetPos.X)
{
movementDir = DIRECTION.LEFT;
m_MovementDelta.X = -1;
targetPos.X += distance;
//targetPos.X += m_SpriteSize.X / 8;
}
}
else
{
movementDir = DIRECTION.UP;
m_MovementDelta.X = 0;
m_MovementDelta.Y = -1;
targetPos.Y += distance;
//targetPos.Y += m_SpriteSize.Y / 2;
if (m_WorldPosition.X < targetPos.X)
{
movementDir = DIRECTION.UP_RIGHT;
m_MovementDelta.X = 1;
targetPos.X -= distance;
targetPos.X -= m_SpriteSize.X;
}
else if (m_WorldPosition.X > targetPos.X)
{
movementDir = DIRECTION.UP_LEFT;
m_MovementDelta.X = -1;
targetPos.X += distance;
//targetPos.X += m_SpriteSize.X / 8;
}
}
m_EntityDircetion = movementDir;
m_DestinationPosition = targetPos;
}
/// <summary>
/// This method changes the direction of the entity
/// to face the desired entity.
/// </summary>
/// <param name="entity"></param>
public void FaceEntity(GameEntitity entity)
{
if (entity == null)
return;
DIRECTION movementDir = DIRECTION.UP;
Vector2 targetPos = Vector2.Add( entity.m_WorldPosition, entity.m_EntityCenter);
m_TargetEntity = entity;
if (m_WorldPosition.Y < targetPos.Y)
{
movementDir = DIRECTION.DOWN;
}
else if (m_WorldPosition.Y > targetPos.Y)
{
movementDir = DIRECTION.UP;
}
else
{
if (m_WorldPosition.X < entity.m_WorldPosition.X)//targetPos.X)
{
if (movementDir == DIRECTION.DOWN)
movementDir = DIRECTION.DOWN_RIGHT;
else if (movementDir == DIRECTION.UP)
movementDir = DIRECTION.UP_RIGHT;
else
movementDir = DIRECTION.RIGHT;
}
else if (m_WorldPosition.X > entity.m_WorldPosition.X)//targetPos.X)
{
if (movementDir == DIRECTION.DOWN)
movementDir = DIRECTION.DOWN_LEFT;
else if (movementDir == DIRECTION.UP)
movementDir = DIRECTION.UP_LEFT;
else
movementDir = DIRECTION.LEFT;
}
else
movementDir = m_EntityDircetion;
}
m_EntityDircetion = movementDir;
}
