/// <summary>
/// Processes the geometry layer, creating the game representation.
/// </summary>
/// <param name="rawLayer">The layer.</param>
/// <param name="map">The map.</param>
/// <param name="tileDefinitions">A global dictionary of all tile definitions.</param>
/// <returns>
/// An instance of a new <see cref="GeometryTileLayer" />.
/// </returns>
private void ProcessGeometryLayer(TmxLayer rawLayer, GeometryTileLayer layer, Map map, IDictionary <int, TileDefinition> tileDefinitions)
{
if (rawLayer == null)
{
throw new ArgumentNullException(nameof(rawLayer));
}
if (layer == null)
{
throw new ArgumentNullException(nameof(layer));
}
if (map == null)
{
throw new ArgumentNullException(nameof(map));
}
if (tileDefinitions == null)
{
throw new ArgumentNullException(nameof(tileDefinitions));
}
TraceSource.TraceEvent(TraceEventType.Verbose, 0, $"Processing layer {rawLayer.Name}");
var tiles = new List <GeometryTile>();
foreach (var tile in rawLayer.Tiles)
{
if (tile.Gid != 0)
{
var geoTile = new GeometryTile();
geoTile.GridPosition = new Int32Point(tile.X, tile.Y);
geoTile.WorldPosition = new Int32Point(tile.X * map.GeometryTileWidth, tile.Y * map.GeometryTileHeight);
geoTile.Definition = tileDefinitions[tile.Gid];
geoTile.DefinitionId = tile.Gid;
tiles.Add(geoTile);
}
}
layer.SetTiles(tiles);
}
/// <summary>
/// Determines whether a
/// </summary>
/// <param name="x">The x coordinate.</param>
/// <param name="y">The y coordinate.</param>
/// <param name="lastTile">The last tile hit.</param>
/// <param name="trace">The trace line parameters.</param>
/// <param name="hitTile">The tile that was hit.</param>
/// <returns>
/// <c>true</c> if point is on a solid tile; otherwise, <c>false</c>.
/// </returns>
private bool IsPointOnSolidTile(int x, int y, GeometryTile lastTile, TraceQuery trace, out GeometryTile hitTile)
{
hitTile = null;
bool hit = false;
var map = _mapService.CurrentMap;
if (map == null)
{
return(hit);
}
var tileCol = (int)Math.Floor((double)x / map.GeometryTileWidth);
var tileRow = (int)Math.Floor((double)y / map.GeometryTileHeight);
if ((tileCol < 0) || (tileRow < 0))
{
return(hit);
}
for (var i = 0; i < map.CollisionLayers.Length; i++)
{
var layer = map.CollisionLayers[i];
// if the trace has specific a collision path, ignore layers that are not on the path
if (trace.CollisionPath != null)
{
if ((layer.CollisionPath != null) && (layer.CollisionPath != trace.CollisionPath))
{
continue;
}
}
var tile = layer.GetTile(tileCol, tileRow);
if (tile != null)
{
// solidity filters
if (
(tile.Definition.SolidType == SolidType.None) &&
((trace.Options & TraceLineOptions.SolidOnly) > TraceLineOptions.None))
{
continue;
}
if (
(tile.Definition.SolidType == SolidType.JumpThrough) &&
((trace.Options & TraceLineOptions.IgnoreJumpThrough) > TraceLineOptions.None))
{
continue;
}
var collisionMap = tile.Definition.CollisionMap;
if (collisionMap != null)
{
var localX = x - tile.WorldPosition.X;
var localY = y - tile.WorldPosition.Y;
if (!hit)
{
if (collisionMap[localX, localY])
{
hitTile = tile;
hit = true;
}
}
}
if (hit)
{
if (_varShowTracelines.Value)
{
if ((lastTile == null) || (lastTile.GridPosition.X != tile.GridPosition.X) || (lastTile.GridPosition.Y != tile.GridPosition.Y))
{
_renderService.HighlightGeometryTile(tileCol, tileRow, 0, 255, 0, 0);
}
}
}
}
}
return(hit);
}
/// <summary>
/// Fires a traceline and collects collision information.
/// </summary>
/// <param name="trace">Object containing the trace line parameters.</param>
/// <returns>
/// A value containing the result of the trace.
/// </returns>
public TraceResult TraceLine(TraceQuery trace)
{
double x0, y0, x1, y1;
List <GameEntity> entities = _entListPool.GetObject();
x0 = trace.Line.Start.X;
y0 = trace.Line.Start.Y;
x1 = trace.Line.End.X;
y1 = trace.Line.End.Y;
if ((trace.Options & TraceLineOptions.IgnoreEntities) == TraceLineOptions.None)
{
GetPossibleCollidersForTraceline(trace, entities);
}
var dx = Math.Abs(x1 - x0);
var dy = Math.Abs(y1 - y0);
int x = (int)Math.Floor(x0);
int y = (int)Math.Floor(y0);
int n = 1;
int x_inc, y_inc;
double error = 0.0D;
if (dx == 0)
{
x_inc = 0;
error = double.MaxValue;
}
else if (x1 > x0)
{
x_inc = 1;
n += (int)Math.Floor(x1) - x;
error = (Math.Floor(x0) + 1 - x0) * dy;
}
else
{
x_inc = -1;
n += x - (int)Math.Floor(x1);
error = (x0 - Math.Floor(x0)) * dy;
}
if (dy == 0)
{
y_inc = 0;
error -= double.MaxValue;
}
else if (y1 > y0)
{
y_inc = 1;
n += (int)Math.Floor(y1) - y;
error -= (Math.Floor(y0) + 1 - y0) * dx;
}
else
{
y_inc = -1;
n += y - (int)Math.Floor(y1);
error -= (y0 - Math.Floor(y0)) * dx;
}
var hit = false;
GeometryTile tile = null;
GameEntity entity = null;
for (; n > 0; --n)
{
// visit
if (entities.Count > 0)
{
hit = IsPointInEntity(entities, x, y, trace, out entity);
}
if (!hit && ((trace.Options & TraceLineOptions.IgnoreTiles) == TraceLineOptions.None))
{
hit = IsPointOnSolidTile(x, y, tile, trace, out tile);
}
if (hit)
{
break;
}
if (error > 0)
{
y += y_inc;
error -= dx;
}
else
{
x += x_inc;
error += dy;
}
}
if (_varShowTracelines.Value)
{
if (hit)
{
_renderService.DrawLine(new Line(trace.Line.Start.X, trace.Line.Start.Y, x, y), 0);
_renderService.DrawLine(new Line(x, y, trace.Line.End.X, trace.Line.End.Y), 0, 0, 255, 0);
}
else
{
_renderService.DrawLine(trace.Line, 0);
}
}
entities.Clear();
_entListPool.PutObject(entities);
var retval = new TraceResult();
retval.Hit = hit;
retval.ContactPoint = new Point(x, y);
retval.Entity = entity;
retval.Tile = tile;
return(retval);
}