/// <summary>
/// Perform pre-collision velocity and position updating.
/// </summary>
/// <param name="map">The map.</param>
/// <param name="deltaTime">The amount of that that has elapsed time since last update.</param>
public virtual void UpdateVelocity(IMap map, int deltaTime)
{
_lastPosition = Position;
// Only perform movement if moving
if (IsOnGround && Velocity == Vector2.Zero)
{
return;
}
#if !TOPDOWN
Vector2 gravity;
if (map == null)
{
gravity = _defaultGravity;
}
else
{
gravity = map.Gravity;
}
if (StandingOn != null)
{
if (!StandingOn.IsEntityStandingOn(this))
{
StandingOn = null;
}
}
if (StandingOn == null)
{
// Increase the velocity by the gravity
var displacement = gravity * (Weight * deltaTime);
Vector2.Add(ref _velocity, ref displacement, out _velocity);
}
#endif
// Check for surpassing the maximum velocity
if (_velocity.X > _maxVelocity.X)
{
_velocity.X = _maxVelocity.X;
}
else if (_velocity.X < -_maxVelocity.X)
{
_velocity.X = -_maxVelocity.X;
}
if (_velocity.Y > _maxVelocity.Y)
{
_velocity.Y = _maxVelocity.Y;
}
else if (_velocity.Y < -_maxVelocity.Y)
{
_velocity.Y = -_maxVelocity.Y;
}
// Move according to the velocity
Move(_velocity * deltaTime);
}
/// <summary>
/// Handles updating this <see cref="Entity"/>.
/// </summary>
/// <param name="imap">The map the <see cref="Entity"/> is on.</param>
/// <param name="deltaTime">The amount of time (in milliseconds) that has elapsed since the last update.</param>
protected virtual void HandleUpdate(IMap imap, int deltaTime)
{
// If moving, perform collision detection
if (Velocity != Vector2.Zero)
{
imap.CheckCollisions(this);
}
#if !TOPDOWN
// If the entity is standing on a wall, make sure they are still standing on it. If they aren't, check if they
// are standing on top of something else.
if (StandingOn != null)
{
if (!StandingOn.IsEntityStandingOn(this))
{
StandingOn = imap.FindStandingOn(this);
}
}
#endif
}