public Vector2 GetPosition(ProjectedPosition pos)
{
pos.X -= _renderGrid.OffsetX;
pos.Y -= _renderGrid.OffsetY;
float x = (float)(pos.X + pos.LocalX) * UNITS_PER_TILE + _position.x;
float y = -((float)(pos.Y + pos.LocalY) * UNITS_PER_TILE) + _position.y;
return(new Vector2(x, y));
}
/// <summary>
/// Inverse mapping equation to get geographical coordinates from Cartesian coordinates
/// </summary>
/// <param name="proj">Cartesian coordinates</param>
/// <returns>Geographical Coordinates</returns>
public static Vector2 ProjectionToGeographic(ProjectedPosition proj)
{
double tilesPerEdge = TilesPerEdge(proj.ZoomLevel);
//Mercator Projection:
double longitude = (proj.X * (360 / tilesPerEdge)) - 180;
double latitude = Mathf.Rad2Deg * (Math.Atan(Math.Sinh((1 - proj.Y * (2 / tilesPerEdge)) * Math.PI)));
return(new Vector2((float)longitude, (float)latitude));
}
private void Initialize()
{
var dim = 2 * MapRadius + 1;
InitCells(dim, dim);
Width = dim * UNITS_PER_TILE;
Height = dim * UNITS_PER_TILE;
_spriteDictionary = new LRUSpriteDictionary((dim + 1) * (dim + 1));
_renderGrid = new RenderGrid(_cells.ToArray(), dim, dim);
_loadedPosition = new ProjectedPosition(MapRadius, MapRadius, ZoomLevel, 0, 0);
_position = new Vector3();
}
private void LoadNewTiles()
{
if (Equals(CurrentPosition, default(ProjectedPosition)))
{
return;
}
_renderGrid.Shift(_loadedPosition.X - CurrentPosition.X, _loadedPosition.Y - CurrentPosition.Y);
_loadedPosition = CurrentPosition;
for (int i = _loadedPosition.Y - MapRadius; i <= _loadedPosition.Y + MapRadius; i++)
{
for (int j = _loadedPosition.X - MapRadius; j <= _loadedPosition.X + MapRadius; j++)
{
if (_renderGrid[j, i] == null)
{
_renderGrid[j, i] = SpawnTile(j, i);
}
}
}
}
public static ProjectedPosition Lerp(ProjectedPosition from, ProjectedPosition to, float t)
{
Vector2 lerped = Vector2.Lerp(from, to, t);
return(new ProjectedPosition(lerped.x, lerped.y, from.ZoomLevel));
}
