private static Vector2D?FindClosestPosition(Vector2D position)
{
var physicsSpace = ServerWorldService.GetPhysicsSpace();
var collisionGroup = CollisionGroup.Default;
if (IsValidPosition(
// round position
position.ToVector2Ushort().ToVector2D()))
{
// can teleport right there
return(position);
}
// check nearby tiles
var tile = ServerWorldService.GetTile(position.ToVector2Ushort());
foreach (var neighborTile in tile.EightNeighborTiles)
{
if (!neighborTile.IsValidTile)
{
continue;
}
var neighborTilePosition = neighborTile.Position.ToVector2D();
if (IsValidPosition(neighborTilePosition))
{
return(neighborTilePosition);
}
}
return(null);
// Local function for checking if the position is valid.
bool IsValidPosition(Vector2D pos)
{
using var objectsNearby = physicsSpace.TestRectangle(
// include some padding, otherwise the check will include border-objects
position: pos + (0.01, 0.01),
size: (0.98, 0.98),
collisionGroup: collisionGroup,
sendDebugEvent: false);
if (objectsNearby.Count > 0)
{
return(false);
}
var posTile = Server.World.GetTile(pos.ToVector2Ushort());
return(ServerCharacterSpawnHelper.IsValidSpawnTile(posTile,
checkNeighborTiles: false));
}
}
protected virtual bool ServerIsValidSpawnPosition(Vector2D worldPosition)
{
const double noObstaclesCheckRadius = 1.5;
var physicsSpace = Server.World.GetPhysicsSpace();
foreach (var _ in physicsSpace.TestCircle(worldPosition,
radius: noObstaclesCheckRadius,
CollisionGroups.Default,
sendDebugEvent: false).EnumerateAndDispose())
{
// position is not valid for spawning
return(false);
}
return(ServerCharacterSpawnHelper.IsValidSpawnTile(
Api.Server.World.GetTile(worldPosition.ToVector2Ushort()),
checkNeighborTiles: true));
}
public static void ServerTrySpawnMobsCustom(
IProtoCharacter protoMob,
ICollection <ICharacter> spawnedCollection,
int countToSpawn,
RectangleInt excludeBounds,
int maxSpawnDistanceFromExcludeBounds,
double noObstaclesCheckRadius,
int maxAttempts)
{
if (countToSpawn <= 0)
{
return;
}
var spawnBounds = excludeBounds.Inflate(maxSpawnDistanceFromExcludeBounds,
maxSpawnDistanceFromExcludeBounds);
var physicsSpace = Api.Server.World.GetPhysicsSpace();
while (maxAttempts-- > 0)
{
var position = new Vector2D(spawnBounds.Left + RandomHelper.NextDouble() * spawnBounds.Width,
spawnBounds.Bottom + RandomHelper.NextDouble() * spawnBounds.Height);
if (IsTooClose(position))
{
continue;
}
var character = ServerTrySpawnMob(position);
if (character is null)
{
// cannot spawn there
continue;
}
spawnedCollection.Add(character);
countToSpawn--;
if (countToSpawn == 0)
{
return;
}
}
bool IsTooClose(in Vector2D position)
=> position.X >= excludeBounds.X &&
position.Y >= excludeBounds.Y &&
position.X < excludeBounds.X + excludeBounds.Width &&
position.Y < excludeBounds.Y + excludeBounds.Height;
ICharacter ServerTrySpawnMob(Vector2D worldPosition)
{
foreach (var _ in physicsSpace.TestCircle(worldPosition,
radius: noObstaclesCheckRadius,
CollisionGroups.Default,
sendDebugEvent: false).EnumerateAndDispose())
{
// position is not valid for spawning
return(null);
}
if (!ServerCharacterSpawnHelper.IsValidSpawnTile(
Api.Server.World.GetTile(worldPosition.ToVector2Ushort()),
checkNeighborTiles: true))
{
return(null);
}
return(Api.Server.Characters.SpawnCharacter(protoMob,
worldPosition));
}
}