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using System;
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using System.Collections.Generic;
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using Mapbox.Map;
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using Mapbox.Unity.Utilities;
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using Mapbox.Utils;
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using UnityEngine;
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namespace Mapbox.Unity.Map.TileProviders
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{
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public class QuadTreeTileProvider : AbstractTileProvider
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{
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private static readonly int HIT_POINTS_COUNT = 4;
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private Plane _groundPlane;
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private bool _shouldUpdate;
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[SerializeField] private CameraBoundsTileProviderOptions _cbtpOptions;
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private Vector2dBounds _viewPortWebMercBounds;
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#region Tile decision and raycasting fields
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private HashSet<UnwrappedTileId> _tiles;
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private HashSet<CanonicalTileId> _canonicalTiles;
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private Ray _ray00;
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private Ray _ray01;
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private Ray _ray10;
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private Ray _ray11;
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private Vector3[] _hitPnt = new Vector3[HIT_POINTS_COUNT];
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private Vector2d[] _hitPntGeoPos = new Vector2d[HIT_POINTS_COUNT];
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private bool _isFirstLoad;
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#endregion
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public override void OnInitialized()
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{
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_tiles = new HashSet<UnwrappedTileId>();
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_canonicalTiles = new HashSet<CanonicalTileId>();
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if (Options != null)
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{
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_cbtpOptions = (CameraBoundsTileProviderOptions)_options;
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}
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else
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{
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_cbtpOptions = new CameraBoundsTileProviderOptions();
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}
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if (_cbtpOptions.camera == null)
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{
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_cbtpOptions.camera = Camera.main;
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}
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_cbtpOptions.camera.transform.hasChanged = false;
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_groundPlane = new Plane(Vector3.up, 0);
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_shouldUpdate = true;
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_currentExtent.activeTiles = new HashSet<UnwrappedTileId>();
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}
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public override void UpdateTileExtent()
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{
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if (!_shouldUpdate)
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{
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return;
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}
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//update viewport in case it was changed by switching zoom level
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_viewPortWebMercBounds = getcurrentViewPortWebMerc();
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_currentExtent.activeTiles = GetWithWebMerc(_viewPortWebMercBounds, _map.AbsoluteZoom);
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OnExtentChanged();
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}
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public HashSet<UnwrappedTileId> GetWithWebMerc(Vector2dBounds bounds, int zoom)
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{
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_tiles.Clear();
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_canonicalTiles.Clear();
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if (bounds.IsEmpty()) { return _tiles; }
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//stay within WebMerc bounds
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Vector2d swWebMerc = new Vector2d(Math.Max(bounds.SouthWest.x, -Utils.Constants.WebMercMax), Math.Max(bounds.SouthWest.y, -Utils.Constants.WebMercMax));
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Vector2d neWebMerc = new Vector2d(Math.Min(bounds.NorthEast.x, Utils.Constants.WebMercMax), Math.Min(bounds.NorthEast.y, Utils.Constants.WebMercMax));
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UnwrappedTileId swTile = WebMercatorToTileId(swWebMerc, zoom);
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UnwrappedTileId neTile = WebMercatorToTileId(neWebMerc, zoom);
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for (int x = swTile.X; x <= neTile.X; x++)
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{
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for (int y = neTile.Y; y <= swTile.Y; y++)
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{
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UnwrappedTileId uwtid = new UnwrappedTileId(zoom, x, y);
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//hack: currently too many tiles are created at lower zoom levels
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//investigate formulas, this worked before
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if (!_canonicalTiles.Contains(uwtid.Canonical))
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{
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_tiles.Add(uwtid);
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_canonicalTiles.Add(uwtid.Canonical);
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}
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}
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}
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return _tiles;
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}
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public UnwrappedTileId WebMercatorToTileId(Vector2d webMerc, int zoom)
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{
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var tileCount = Math.Pow(2, zoom);
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var dblX = webMerc.x / Utils.Constants.WebMercMax;
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var dblY = webMerc.y / Utils.Constants.WebMercMax;
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int x = (int)Math.Floor((1 + dblX) / 2 * tileCount);
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int y = (int)Math.Floor((1 - dblY) / 2 * tileCount);
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return new UnwrappedTileId(zoom, x, y);
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}
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private Vector2dBounds getcurrentViewPortWebMerc(bool useGroundPlane = true)
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{
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if (useGroundPlane)
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{
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// rays from camera to groundplane: lower left and upper right
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_ray00 = _cbtpOptions.camera.ViewportPointToRay(new Vector3(0, 0));
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_ray01 = _cbtpOptions.camera.ViewportPointToRay(new Vector3(0, 1));
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_ray10 = _cbtpOptions.camera.ViewportPointToRay(new Vector3(1, 0));
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_ray11 = _cbtpOptions.camera.ViewportPointToRay(new Vector3(1, 1));
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_hitPnt[0] = getGroundPlaneHitPoint(_ray00);
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_hitPnt[1] = getGroundPlaneHitPoint(_ray01);
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_hitPnt[2] = getGroundPlaneHitPoint(_ray10);
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_hitPnt[3] = getGroundPlaneHitPoint(_ray11);
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}
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// Find min max bounding box.
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// TODO : Find a better way of doing this.
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double minLat = double.MaxValue;
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double minLong = double.MaxValue;
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double maxLat = double.MinValue;
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double maxLong = double.MinValue;
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for (int pointIndex = 0; pointIndex < HIT_POINTS_COUNT; ++pointIndex)
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{
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_hitPntGeoPos[pointIndex] = _map.WorldToGeoPosition(_hitPnt[pointIndex]);
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}
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for (int i = 0; i < HIT_POINTS_COUNT; i++)
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{
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if (_hitPnt[i] == Vector3.zero)
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{
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continue;
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}
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else
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{
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if (minLat > _hitPntGeoPos[i].x)
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{
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minLat = _hitPntGeoPos[i].x;
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}
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if (minLong > _hitPntGeoPos[i].y)
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{
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minLong = _hitPntGeoPos[i].y;
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}
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if (maxLat < _hitPntGeoPos[i].x)
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{
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maxLat = _hitPntGeoPos[i].x;
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}
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if (maxLong < _hitPntGeoPos[i].y)
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{
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maxLong = _hitPntGeoPos[i].y;
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}
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}
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}
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Vector2d hitPntSWGeoPos = new Vector2d(minLat, minLong);
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Vector2d hitPntNEGeoPos = new Vector2d(maxLat, maxLong);
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Vector2dBounds tileBounds = new Vector2dBounds(Conversions.LatLonToMeters(hitPntSWGeoPos), Conversions.LatLonToMeters(hitPntNEGeoPos)); // Bounds debugging.
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#if UNITY_EDITOR
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Debug.DrawLine(_cbtpOptions.camera.transform.position, _map.GeoToWorldPosition(hitPntSWGeoPos), Color.blue);
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Debug.DrawLine(_cbtpOptions.camera.transform.position, _map.GeoToWorldPosition(hitPntNEGeoPos), Color.red);
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#endif
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return tileBounds;
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}
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private Vector3 getGroundPlaneHitPoint(Ray ray)
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{
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float distance;
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if (!_groundPlane.Raycast(ray, out distance)) { return Vector3.zero; }
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return ray.GetPoint(distance);
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}
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public override void UpdateTileProvider()
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{
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if (_cbtpOptions != null && _cbtpOptions.camera != null && _cbtpOptions.camera.transform.hasChanged)
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{
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UpdateTileExtent();
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_cbtpOptions.camera.transform.hasChanged = false;
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}
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}
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public override bool Cleanup(UnwrappedTileId tile)
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{
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return (!_currentExtent.activeTiles.Contains(tile));
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}
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}
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}
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