/// <summary>
/// Whether or not this object should collide with another object.
/// </summary>
/// <param name="other">The other object to check for a collision
/// against.</param>
/// <param name="region">The region of collision. An empty bounding box
/// if the objects do not collide.</param>
/// <returns>True if the objects should collide, false otherwise.</returns>
internal bool ShouldCollide(GameObject other, out BBox region)
{
region = BBox.Intersect(other.BBox);
return !region.IsEmpty();
}
/**
* Handle collision events.
**/
public override void Collide(GameObject other, BBox region)
{
if (!HasCollided && (!other.Equals(owner)))
{
OnCollision();
/**base.Collide(other, region);**/
}
}
/// <summary>
/// Resolves the collision in a region between this object
/// and another.
/// </summary>
/// <param name="other">The other object being collided with.</param>
/// <param name="region">The region of collision.</param>
public virtual void Collide(GameObject other, BBox region) {
}
public BoomStick(GameObject owner, Vector2 position, Vector2 initialVelocity, Texture2D Texture) :
base(owner,
position,
new Vector2(ORIGIN_X, ORIGIN_Y), // Origin
initialVelocity,
new Vector2(MAX_SPEED_X, MAX_SPEED_Y),
new Vector2(ACCELERATION_X, ACCELERATION_Y),
new Vector2(ACCELERATION_X, ACCELERATION_Y),
Texture,
DIR + ONFIREXML,
DIR + INFLIGHTXML,
DIR + ONCOLLISIONXML,
ROTATION,
ROTATION_SPEED,
1.0,
PARTICLE_SCALING
)
{
OnFire();
}
/// <summary>
/// Creates a new projectile.
/// </summary>
/// <param name="owner">The object that fired the projectile.</param>
/// <param name="position">The initial position of the projectile.</param>
/// <param name="origin">The origin point of the projectile.</param>
/// <param name="initialVelocity">The initial velocity of the projectile.</param>
/// <param name="maxSpeed">The maximum speed of the projectile.</param>
/// <param name="acceleration">The acceleration of the projectile.</param>
/// <param name="deceleration">The deccceleration of the projectile.</param>
/// <param name="texture">The texture of the projectile.</param>
/// <param name="OnFireFX_XML">The relative path to the XML file from which the
/// effects for firing a projectile are loaded.</param>
/// <param name="InFlightFX_XML">The relative path to the XML file from which the
/// effects used for an in-flight particle are loaded.</param>
/// <param name="OnCollisionFX_XML">The relative path to the XML file from which the
/// effects used for a projectile that has collided with a surface are loaded.</param>
/// <param name="rotation">The initial rotation of the projectile.</param>
/// <param name="rotationVelocity">The speed at which the projectile spins.
/// Negative for counter-clockwise, positive for clockwise, 0 for no spinning.</param>
/// <param name="particleLevel"></param>
/// <param name="particleScaling"></param>
public Projectile(
GameObject owner,
Vector2 position,
Vector2 origin,
Vector2 initialVelocity,
Vector2 maxSpeed,
Vector2 acceleration,
Vector2 deceleration,
Texture2D texture,
String OnFireFX_XML,
String InFlightFX_XML,
String OnCollisionFX_XML,
float rotation, //TODO: Create global default values for rotation,
float rotationVelocity, // rotationSpeed and particleLevel (possible from GameObject constants)
double particleLevel = 1.0,
double particleScaling = 1.0)
: base(position, origin, initialVelocity, maxSpeed, acceleration, deceleration, texture, rotation, rotationVelocity)
{
this.owner = owner;
OnFireFXEmitter = new XNAEmitter(/**parent,**/ position, OnFireFX_XML, particleLevel, particleScaling);
InFlightFXEmitter = new XNAEmitter(/**parent,**/ position, InFlightFX_XML, particleLevel, particleScaling);
OnCollisionFXEmitter = new XNAEmitter(/**parent,**/ position, OnCollisionFX_XML, particleLevel, particleScaling);
}
/// <summary>
/// Get all the walls that intersect with the given object.
/// </summary>
/// <param name="obj">The object.</param>
/// <returns>All the walls that collide with the object.</returns>
public List<Tile> GetIntersectingWalls(GameObject obj)
{
List<Tile> intersects = new List<Tile>();
Vector2 tileCoords = GetTileCoordsByPixel(obj.BBox.Position);
float colSpan = GetColSpan(obj);
float rowSpan = GetRowSpan(obj);
for (int x = (int)tileCoords.X; x <= tileCoords.X + rowSpan; x++)
for (int y = (int)tileCoords.Y; y <= tileCoords.Y + colSpan; y++)
if (WallAt(x, y))
intersects.Add(tiles[x, y]);
return intersects;
}
/// <summary>
/// Adds the given object to the given room of the world.
/// </summary>
/// <param name="obj">The object to be put in the room.</param>
/// <param name="room">The room for the object to be put in.</param>
private void Add(GameObject obj, Room room)
{
room.Add(obj);
}
/// <summary>
/// Returns the nearest of the 8 directions in which
/// the target lies.
/// </summary>
/// <param name="target">A gameobject to target</param>
/// <returns></returns>
internal Direction NearestDirToTarget(GameObject target)
{
float xDelta, yDelta;
double theta, thetaHat;
xDelta = BBox.Center.X - target.BBox.Center.X;
yDelta = BBox.Center.Y - target.BBox.Center.Y;
theta = Math.Atan2(yDelta, xDelta);
thetaHat = Math.Round(theta / (Math.PI / 4));
return DirectionOperations.FromRadians(thetaHat * (Math.PI / 4),4);
}
/// <summary>
/// Hide from target: Attempts to put a wall
/// between itself and target. If no wall available,
/// runs to furthest corner.
/// </summary>
/// <param name="target"></param>
internal void Hide(GameObject target, Room room)
{
}
/// <summary>
/// Return whether or not the given object is out of bounds.
/// </summary>
/// <param name="obj">The object to check.</param>
/// <param name="violationDirection">The direction in which the object is out of bounds,
/// or Direction.None if the object is not out of bounds.</param>
/// <returns>True if the object is out of bounds, false otherwise.</returns>
public bool OutOfBounds(GameObject obj, out Direction violationDirection)
{
violationDirection = Direction.None;
// get the direction in which the object is out of bounds, if any at all
// priority: West > North > East > South
if (obj.Position.X < 0)
violationDirection = Direction.West;
else if (obj.Position.Y < 0)
violationDirection = Direction.North;
else if (obj.Position.X + obj.BBox.Width >= GetWidthInPixels())
violationDirection = Direction.East;
else if (obj.Position.Y + obj.BBox.Height >= GetHeightInPixels())
violationDirection = Direction.South;
return violationDirection == Direction.None;
}
/// <summary>
/// Removes the given object from the room after the update has finished.
/// Safer than Remove to call during an update.
/// </summary>
/// <param name="obj">The object to be removed.</param>
public void RemoveAfterUpdate(GameObject obj)
{
removedObjects.Add(obj);
}
/// <summary>
/// Removes the given object from the room.
/// </summary>
/// <param name="obj">The object to be removed from the room.</param>
public void Remove(GameObject obj)
{
objects.Remove(obj);
}
/// <summary>
/// Adds given object to the room after the update has finished.
/// Safer than Add to call during an update.
/// </summary>
public void AddAfterUpdate(GameObject obj)
{
addedObjects.Add(obj);
}
/// <summary>
/// Adds the given object to the objects list.
/// </summary>
/// <param name="obj">The object to be put in the room.</param>
public void Add(GameObject obj)
{
objects.Add(obj);
}
/// <summary>
/// Finds the nearest valid point in the current room
/// from which enemy can fire at specified target, then
/// return the direction its in.
/// Firing occurs in the eight directions specified
/// by the Direction class.
/// </summary>
/// <param name="target"></param>
/// <param name="room"></param>
internal void MoveToNearestFirePoint(GameObject target, GameTime gameTime, Room room)
{
float xDelta, yDelta, xyDelta;
double theta;
Vector2 moveVector;
xDelta = BBox.Center.X - target.BBox.Center.X;
yDelta = BBox.Center.Y - target.BBox.Center.Y;
xyDelta = Math.Abs(xDelta) - Math.Abs(yDelta);
if (xyDelta < Math.Abs(xDelta) && xyDelta < Math.Abs(yDelta))
{
if (Math.Abs(xDelta) <= Math.Abs(yDelta))
{
moveVector = new Vector2(0, -1 * yDelta / Math.Abs(yDelta));
}
else
{
moveVector = new Vector2(-1 * xDelta / Math.Abs(xDelta), 0);
}
}
else
{
if (Math.Abs(xDelta) <= Math.Abs(yDelta))
{
moveVector = new Vector2(-1 * xDelta / Math.Abs(xDelta), 0);
}
else
{
moveVector = new Vector2(0, -1 * yDelta / Math.Abs(yDelta));
}
}
if (Velocity.X > Math.Abs(xDelta))
Velocity.X = Math.Abs(xDelta);
else Velocity.X = MAX_VELOCITY_X;
if (Velocity.Y > Math.Abs(xDelta))
Velocity.Y = Math.Abs(xDelta);
else Velocity.Y = MAX_VELOCITY_Y;
Move(DirectionOperations.FromVector(moveVector), gameTime, room);
}
/// <summary>
/// Returns the target's direction if directly within one of
/// the 8 Directions. Returns Direction.None otherwise.
/// </summary>
/// <param name="target"></param>
/// <param name="room"></param>
/// <returns></returns>
internal Direction IsOrthogonalDiagonal(GameObject target, Room room)
{
float xDelta, yDelta;
double theta;
xDelta = BBox.Center.X - target.BBox.Center.X;
yDelta = BBox.Center.Y - target.BBox.Center.Y;
theta = Math.Atan2(yDelta, xDelta);
return DirectionOperations.FromRadians(theta, SHOOTING_PRECISION_DIGITS);
}
/// <summary>
/// Keeps the given object within the boundaries of the room.
/// </summary>
/// <param name="obj">The object to keep in bounds.</param>
public void KeepInBounds(GameObject obj)
{
// if the object went outside the boundaries of the room, collide it with a wall and push
// it back in.
Vector2 oldPosition = obj.Position;
obj.Position = Vector2.Clamp(obj.Position, Vector2.Zero,
new Vector2(GetWidthInPixels() - obj.BBox.Width - 1, GetHeightInPixels() - obj.BBox.Height - 1));
if (oldPosition != obj.Position)
{
// TODO: properly create a region of collision corresponding to the amount of the exit overlapped
Vector2 change = new Vector2(Math.Abs(oldPosition.X - obj.Position.X),
Math.Abs(oldPosition.Y - obj.Position.Y));
obj.Collide(new Tile(TileType.Wall), new BBox(oldPosition, (int)change.X, (int)change.Y));
}
}
/// <summary>
/// Returns distance in pixels to the specified GameObject.
/// NOTE: May want to move to GameObject.
/// </summary>
/// <param name="target"></param>
/// <returns></returns>
internal Double DistanceToObject(GameObject target)
{
return Math.Sqrt(
Math.Pow(BBox.Center.X - target.BBox.Center.X, 2) +
Math.Pow(BBox.Center.Y - target.BBox.Center.Y, 2));
}
/// <summary>
/// Get the number of columns that the given object spans over.
/// </summary>
/// <param name="obj">An object in the room.</param>
/// <returns>The number of columns that the object spans over, starting at 0 if the object is
/// confined to 1 tile.</returns>
private int GetColSpan(GameObject obj)
{
return (int)(((obj.BBox.Y % TILESIZE) + obj.BBox.Height) / TILESIZE);
}
/// <summary>
/// Adds the given object to the current room of the world.
/// </summary>
/// <param name="obj">The object to be added to the current room.</param>
public void Add(GameObject obj)
{
Add(obj, curRoom);
}
/// <summary>
/// Get the number of rows that the given object spans over.
/// </summary>
/// <param name="obj">An object in the room.</param>
/// <returns>The number of rows that the object spans over, starting at 0 if the object is
/// confined to 1 tile.</returns>
private int GetRowSpan(GameObject obj)
{
return (int)(((obj.BBox.X % TILESIZE) + obj.BBox.Width) / TILESIZE);
}
/// <summary>
/// Gets the next start position of an object in a room,
/// given its entering direction.
/// </summary>
/// <param name="obj">An object entering a new room.</param>
/// <param name="direction">The direction the object is entering the room from.</param>
/// <returns>The starting position of the object in the room.</returns>
private Vector2 GetNextStartPosition(GameObject obj, Direction direction)
{
float newXPos = obj.Position.X, newYPos = obj.Position.Y;
if (DirectionOperations.IsHorizontal(direction))
{
// start it at the opposite end of the room
newXPos = MathHelper.Distance(obj.Position.X, curRoom.GetWidthInPixels());
// pad the object away from entrance to prevent them from exiting immediately
newXPos += (newXPos <= curRoom.GetWidthInPixels() / 2) ? ENTRANCE_PADDING : -ENTRANCE_PADDING;
}
if (DirectionOperations.IsVertical(direction))
{
newYPos = MathHelper.Distance(obj.Position.Y, curRoom.GetHeightInPixels());
newYPos += (newYPos <= curRoom.GetHeightInPixels() / 2) ? ENTRANCE_PADDING : -ENTRANCE_PADDING;
}
return new Vector2(newXPos, newYPos);
}
/// <summary>
/// Check if the given object is at the edge of the room.
/// </summary>
/// <param name="obj">The object in the room to check.</param>
/// <param name="direction">The edge of the room that the object is at, or
/// Direction.None if the object is not at the edge of the room.</param>
/// <returns>True if the object is at the edge of the room, false otherwise.</returns>
private bool AtEdge(GameObject obj, out Direction direction)
{
// use the center of the object's bounding box as the telltale point of whether or not
// the object is at the edge.
Vector2 coords = GetTileCoordsByPixel(new Vector2(obj.BBox.Center.X, obj.BBox.Center.Y));
direction = Direction.None;
// check diagonal edges first
if (coords.X == 0 && coords.Y == 0)
direction = Direction.NorthWest;
else if (coords.X == Width - 1 && coords.Y == 0)
direction = Direction.NorthEast;
else if (coords.X == 0 && coords.Y == Height - 1)
direction = Direction.SouthWest;
else if (coords.X == Width - 1 && coords.Y == Height - 1)
direction = Direction.SouthEast;
// check the other edges
else if (coords.X == 0)
direction = Direction.West;
else if (coords.X == Width - 1)
direction = Direction.East;
else if (coords.Y == 0)
direction = Direction.North;
else if (coords.Y == Height - 1)
direction = Direction.South;
return direction != Direction.None;
}
/// <summary>
/// Return whether or not a wall overlaps the given object.
/// </summary>
/// <param name="box">The bounding box that might be overlapping a wall.</param>
/// <returns>True if the box overlaps a wall, false otherwise.</returns>
private bool WallIntersects(GameObject obj)
{
// TODO: check every tile that the box overlaps, not just the corners.
return WallAtPixel(obj.BBox.Left, obj.BBox.Top) || WallAtPixel(obj.BBox.Right, obj.BBox.Top) ||
WallAtPixel(obj.BBox.Left, obj.BBox.Bottom) || WallAtPixel(obj.BBox.Right, obj.BBox.Bottom);
}
/// <summary>
/// Keeps the given object within the boundaries of the room.
/// </summary>
/// <param name="obj">The object to keep in bounds.</param>
public void KeepInBounds(GameObject obj)
{
obj.Position = Vector2.Clamp(obj.Position, Vector2.Zero,
new Vector2(GetWidthInPixels() - obj.BBox.Width - 1, GetHeightInPixels() - obj.BBox.Height - 1));
}