public void ApplyPhysics(PhysicalProperties entityProps, IPhysicsObject entity, GameTime gameTime)
{
var delta = (float)gameTime.ElapsedGameTime.TotalSeconds;
var lastPos = entityProps.Position;
var neighbours = new IPhysicsObject[0];
var overlappingObjs = new List <IPhysicsObject>();
// [ Y ]
entityProps.Position.Y += (entityProps.Velocity.Y * delta);
// get new neighbours since objects have probably moved
neighbours = chunkMap.GetNearbyCollidables(entity);
// overlaps
if (entity.IsOverlappingEnabled)
{
var overlaps = neighbours.Where(n => n.IsOverlappingEnabled && entity.OverlapBox.IntersectsWith(n.OverlapBox));
foreach (var overlap in overlaps)
{
overlap.OnOverlapping(entity);
entity.OnOverlapping(overlap);
if (!overlappingObjs.Contains(overlap))
{
overlappingObjs.Add(overlap);
}
}
}
// collision
if (entity.IsCollisionEnabled)
{
var collisions = neighbours.Where(n => n.IsCollisionEnabled && entity.CollisionBox.IntersectsWith(n.CollisionBox));
var hasCollided = false;
foreach (var collision in collisions)
{
if (hasCollided)
{
continue;
}
hasCollided = true;
var up = entityProps.Velocity.Y < 0;
entityProps.Velocity.Y = 0;
if (up)
{
entityProps.Position.Y = collision.CollisionBox.Bottom + 1;
}
else
{
entityProps.Position.Y = collision.CollisionBox.Top - entity.CollisionBox.Height;
}
collision.OnCollision(entity);
entity.OnCollision(collision);
}
}
// [ X ]
entityProps.Position.X = entityProps.Position.X + (entityProps.Velocity.X * delta);
// get new neighbours since objects have probably moved
neighbours = chunkMap.GetNearbyCollidables(entity);
if (entity.IsOverlappingEnabled)
{
// overlaps
var overlaps = neighbours.Where(n => n.IsOverlappingEnabled && entity.OverlapBox.IntersectsWith(n.OverlapBox));
foreach (var overlap in overlaps)
{
overlap.OnOverlapping(entity);
entity.OnOverlapping(overlap);
if (!overlappingObjs.Contains(overlap))
{
overlappingObjs.Add(overlap);
}
}
}
if (entity.IsCollisionEnabled)
{
// collision
var collisions = neighbours.Where(n => n.IsCollisionEnabled && entity.CollisionBox.IntersectsWith(n.CollisionBox));
var hasCollided = false;
foreach (var collision in collisions)
{
if (hasCollided)
{
continue;
}
hasCollided = true;
entityProps.Velocity.X = 0;
entityProps.Position.X = lastPos.X;
collision.OnCollision(entity);
entity.OnCollision(collision);
}
}
// track overlappers
entityProps.OverlappingObjects = overlappingObjs;
// get new neighbours since objects have probably moved
neighbours = chunkMap.GetNearbyCollidables(entity);
switch (physSettings.PhysicsType)
{
case PhysicsType.Platformer:
handlePlatformerAdditionalPhysics(entityProps, entity, neighbours, gameTime);
break;
case PhysicsType.Topdown:
handleTopDownAdditionalPhysics(entityProps, entity, neighbours, gameTime);
break;
}
// [ Chunk map update ]
chunkMap.UpdateEntity(entity);
}
