/// <summary>
/// Recursive function to get all elements intersecting a given bounding box
/// </summary>
public void GetElements(
CollisionBox b,
List <CollisionTreeElem> e,
uint recurseId)
{
// if selection box does not intersect node box, return
if (b.BoxIntersect(box) == false)
{
return;
}
// if any elements in this node add them to selection list
if (elems != null)
{
foreach (CollisionTreeElem elem in elems)
{
// elements can be repeated in many nodes
// only add element to selection list if not already
// added by another node in this same recursion
if (elem.lastRecurseId < recurseId)
{
// if selection box intersect the element box
if (elem.box.BoxIntersect(b))
{
// add element to selection list
e.Add(elem);
}
// set this recuse id to prevent duplicate results
elem.lastRecurseId = recurseId;
}
}
}
// if not a leaf node, recurso to all children
if (children != null)
{
foreach (CollisionTreeNode n in children)
{
n.GetElements(b, e, recurseId);
}
}
}
public void GetElements(CollisionBox b, List<CollisionTreeElem> e, uint recurse_id)
{
if (b.BoxIntersect(box) == false)
return;
if (elems != null)
{
foreach (CollisionTreeElem elem in elems)
{
if (elem.last_recurse_id < recurse_id)
{
if (elem.box.BoxIntersect(b))
e.Add(elem);
elem.last_recurse_id = recurse_id;
}
}
}
if (childs != null)
{
foreach (CollisionTreeNode n in childs)
n.GetElements(b, e, recurse_id);
}
}
/// <summary>
/// Recursive function to get all elements intersecting a given bounding box
/// </summary>
public void GetElements(
CollisionBox b,
List<CollisionTreeElem> e,
uint recurseId)
{
// if selection box does not intersect node box, return
if (b.BoxIntersect(box) == false)
return;
// if any elements in this node add them to selection list
if (elems != null)
{
foreach (CollisionTreeElem elem in elems)
{
// elements can be repeated in many nodes
// only add element to selection list if not already
// added by another node in this same recursion
if (elem.lastRecurseId < recurseId)
{
// if selection box intersect the element box
if (elem.box.BoxIntersect(b))
// add element to selection list
e.Add(elem);
// set this recuse id to prevent duplicate results
elem.lastRecurseId = recurseId;
}
}
}
// if not a leaf node, recurso to all children
if (children != null)
{
foreach (CollisionTreeNode n in children)
n.GetElements(b, e, recurseId);
}
}
/// <summary>
/// Check collisions for dynamic objects
/// </summary>
public virtual void CheckCollisions(GameTime gameTime)
{
GameEntityList deadObjects = new GameEntityList();
CollisionBox cameraBox = new CollisionBox(this.camera.box);
cameraBox.min += this.camera.world.Translation;
cameraBox.max += this.camera.world.Translation;
cameraBox.min.Y -= this.camera.head_height + this.camera.step_height;
cameraBox.max.Y += this.camera.head_height + this.camera.step_height;
///Dynamic objects with player
foreach (GameEntity ge in this.sceneObjects.Values)
{
if (cameraBox.BoxIntersect(ge.Box))
{
if (ge is ICatchable)
{
((ICatchable)ge).Attach(this.player);
deadObjects.Add(ge.ModelMesh.Name, ge);
ge.ModelMesh.Tag = null;
}
else if (ge is IAttachable)
{
if (ge is GameObjectEntity)
this.player.Add((GameObjectEntity)ge);
}
}
ge.Update(gameTime, this.collisionMesh);
}
foreach (GameEntity ge in deadObjects.Values)
{
this.sceneObjects.Remove(ge.ModelMesh.Name);
}
deadObjects.Clear();
///Enemies with player
foreach (Enemy e in this.enemies.Values)
{
if (e.ActualAnimationState != GameEntityAnimationState.Die)
{
if (cameraBox.BoxIntersect(e.Box))
{
this.SendMessage(player, e, GameEntityMessageType.Hit, gameTime);
}
}
e.Update(gameTime, this.collisionMesh);
}
///Bullets with enemies, static objects...
foreach (Bullet b in this.bullets)
{
Vector3 position = b.Position;
Vector3 speed = b.Speed;
Vector3 new_pos = position + speed * (float)gameTime.ElapsedGameTime.TotalSeconds;
this.collisionMesh.PointMove(position, new_pos, 1.0f, 1.0f, 3, out position);
//these are discartable, just to pass to the PointIntersect method as out parameters
float intersect_distance;
Vector3 intersect_position = new Vector3();
Vector3 intersection_normal = new Vector3();
//collision of bullets with static scenario (walls, etc.)
if (this.collisionMesh.PointIntersect(position, new_pos, out intersect_distance, out intersect_position, out intersection_normal))
{
b.Dead = true;
}
//collision of bullets with enemies
foreach (Enemy e in this.enemies.Values)
{
if (e.Box.PointInside(b.Position))
{
b.Dead = true;
SendMessage(b, e, GameEntityMessageType.Damage, gameTime);
if (e.Health >= 10)
SendMessage(b, e, GameEntityMessageType.Hit, gameTime);
}
}
b.Position = position;
b.Speed = speed;
}
}
/// <summary>
/// Update game for given elapsed time
/// </summary>
public void Update(float elapsedTime)
{
// update player 1
players[0].Update(elapsedTime, levelCollision, levelSpawns);
// if in multiplayer mode
if (gameMode == GameMode.MultiPlayer)
{
// update player 2
players[1].Update(elapsedTime, levelCollision, levelSpawns);
// if both players are alive
if (players[0].IsAlive && players[1].IsAlive)
{
// test collision between players
Vector3 position1 = players[0].Position;
Vector3 position2 = players[1].Position;
CollisionBox player1Box = new CollisionBox(
position1 + players[0].box.min,
position1 + players[0].box.max);
CollisionBox player2Box = new CollisionBox(
position2 + players[1].box.min,
position2 + players[1].box.max);
// if player boxes intersect
if (player1Box.BoxIntersect(player2Box))
{
// compute push direction
Vector3 direction = Vector3.Normalize(position2 - position1);
// push players in oposide directions
direction *= GameOptions.ShipCollidePush;
players[0].AddImpulseForce(-direction);
players[1].AddImpulseForce(direction);
// play ship collide sound
PlaySound("ship_collide");
}
}
}
// update animated sprites
animatedSprite.Update(elapsedTime);
// update animated projectiles
projectile.Update(elapsedTime);
// update particle systems
particle.Update(elapsedTime);
// update powerups
powerup.Update(elapsedTime);
// delete any finished 3D sounds
cueSoundsDelete.Clear();
foreach (Cue cue in cueSounds)
if (cue.IsStopped)
cueSoundsDelete.Add(cue);
foreach (Cue cue in cueSoundsDelete)
{
cueSounds.Remove(cue);
cue.Dispose();
}
// if gamepad vibreate enabled
if (GameOptions.UseGamepadVibrate)
{
// check vibration for each player
for (int i = 0; i < GameOptions.MaxPlayers; i++)
{
float leftMotorAmount = 0;
float rightMotorAmount = 0;
// if left vibration
if (vibrationTime[i] > 0)
{
leftMotorAmount = GameOptions.VibrationIntensity *
Math.Min(1.0f,
vibrationTime[i] / GameOptions.VibrationFadeout);
vibrationTime[i] = Math.Max(0.0f,
vibrationTime[i] - elapsedTime);
}
else
// if right vibration
if (vibrationTime[i] < 0)
{
rightMotorAmount = GameOptions.VibrationIntensity *
Math.Min(1.0f,
-vibrationTime[i] / GameOptions.VibrationFadeout);
vibrationTime[i] = Math.Min(0.0f,
vibrationTime[i] + elapsedTime);
}
// set vibration values
GamePad.SetVibration((PlayerIndex)i, leftMotorAmount,
rightMotorAmount);
}
}
}