// check if a tile is fully visible
private bool CheckTileExistence(int tileRoundedZoom, int tileX, int tileY)
{
string key = Tile.GetTileKey(tileRoundedZoom, tileX, tileY);
if (!tiles.ContainsKey(key))
{
return(true); // the tile is out of the frustum
}
Tile tile = tiles[key];
Renderer r = tile.GetComponent <Renderer>();
return(r.enabled && r.material.mainTexture != null && !tile.Showing);
}
// <summary>
// A recursive method that grows tiles starting from the map's center in all four directions.
// </summary>
void GrowTiles(Plane[] frustum, int tileX, int tileY, int tileCountOnX, int tileCountOnY, float offsetX, float offsetZ)
{
tileTemplate.transform.position = new Vector3(offsetX, tileTemplate.transform.position.y, offsetZ);
if (GeometryUtility.TestPlanesAABB(frustum, tileTemplate.GetComponent <Collider>().bounds) == true)
{
if (tileX < 0)
{
tileX += tileCountOnX;
}
else if (tileX >= tileCountOnX)
{
tileX -= tileCountOnX;
}
string tileAddress = Tile.GetTileKey(Map.RoundedZoom, tileX, tileY);
//Debug.Log("DEBUG: tile address: " + tileAddress);
if (tiles.ContainsKey(tileAddress) == false)
{
Tile tile = null;
if (tileCache.Count > 0)
{
tile = tileCache[0];
tileCache.Remove(tile);
tile.transform.position = tileTemplate.transform.position;
tile.transform.localScale = new Vector3(Map.RoundedHalfMapScale, 1.0f, Map.RoundedHalfMapScale);
//tile.gameObject.active = this.gameObject.active;
}
else
{
tile = (GameObject.Instantiate(tileTemplate.gameObject) as GameObject).GetComponent <Tile>();
tile.transform.parent = this.gameObject.transform;
}
tile.name = "tile_" + tileAddress;
tiles.Add(tileAddress, tile);
//MeshRenderer tileMeshRenderer = tile.GetComponent<MeshRenderer>();
//tileMeshRenderer.enabled = true;
RequestTile(tileX, tileY, Map.RoundedZoom, tile);
}
tileAddressLookedFor = tileAddress;
if (visitedTiles.Exists(visitedTilesMatchPredicate) == false)
{
visitedTiles.Add(tileAddress);
// grow tiles in the four directions without getting outside of the coordinate range of the zoom level
int nTileX, nTileY;
float nOffsetX, nOffsetZ;
if (GetNeighbourTile(tileX, tileY, offsetX, offsetZ, tileCountOnX, tileCountOnY, NeighbourTileDirection.South, out nTileX, out nTileY, out nOffsetX, out nOffsetZ))
{
GrowTiles(frustum, nTileX, nTileY, tileCountOnX, tileCountOnY, nOffsetX, nOffsetZ);
}
if (GetNeighbourTile(tileX, tileY, offsetX, offsetZ, tileCountOnX, tileCountOnY, NeighbourTileDirection.North, out nTileX, out nTileY, out nOffsetX, out nOffsetZ))
{
GrowTiles(frustum, nTileX, nTileY, tileCountOnX, tileCountOnY, nOffsetX, nOffsetZ);
}
if (GetNeighbourTile(tileX, tileY, offsetX, offsetZ, tileCountOnX, tileCountOnY, NeighbourTileDirection.East, out nTileX, out nTileY, out nOffsetX, out nOffsetZ))
{
GrowTiles(frustum, nTileX, nTileY, tileCountOnX, tileCountOnY, nOffsetX, nOffsetZ);
}
if (GetNeighbourTile(tileX, tileY, offsetX, offsetZ, tileCountOnX, tileCountOnY, NeighbourTileDirection.West, out nTileX, out nTileY, out nOffsetX, out nOffsetZ))
{
GrowTiles(frustum, nTileX, nTileY, tileCountOnX, tileCountOnY, nOffsetX, nOffsetZ);
}
}
}
}