/// <summary>
/// Calculates the absolute pixel position for a zoom level and tile size relative to origin
/// </summary>
/// <param name="Point"> </param>
/// <param name="mapSize"> precomputed size of map. </param>
/// <returns> the relative pixel position to the origin values (e.g. for a tile) </returns>
public static Point GetPixelRelative(Point Point, long mapSize, double x, double y)
{
double pixelX = MercatorProjection.LongitudeToPixelX(Point.X, mapSize) - x;
double pixelY = MercatorProjection.LatitudeToPixelY(Point.Y, mapSize) - y;
return(new Point(pixelX, pixelY));
}
public static Point GetPixel(Point Point, long mapSize)
{
double pixelX = MercatorProjection.LongitudeToPixelX(Point.X, mapSize);
double pixelY = MercatorProjection.LatitudeToPixelY(Point.Y, mapSize);
return(new Point(pixelX, pixelY));
}
public static Point GetPixelWithScaleFactor(Point Point, double scaleFactor, int tileSize)
{
double pixelX = MercatorProjection.LongitudeToPixelXWithScaleFactor(Point.X, scaleFactor, tileSize);
double pixelY = MercatorProjection.LatitudeToPixelYWithScaleFactor(Point.Y, scaleFactor, tileSize);
return(new Point(pixelX, pixelY));
}
public static BoundingBox ToBoundingBox(this Tile tile)
{
sbyte level = (sbyte)tile.ZoomLevel;
double minY = Math.Max(MercatorProjection.LATITUDE_MIN, MercatorProjection.TileYToLatitude(tile.Row + 1, level));
double minX = Math.Max(-180, MercatorProjection.TileXToLongitude(tile.Col, level));
double maxY = Math.Min(MercatorProjection.LATITUDE_MAX, MercatorProjection.TileYToLatitude(tile.Row, level));
double maxX = Math.Min(180, MercatorProjection.TileXToLongitude(tile.Col + 1, level));
if (maxX == -180)
{
// fix for dateline crossing, where the right tile starts at -180 and causes an invalid bbox
maxX = 180;
}
return(new BoundingBox(minX, minY, maxX, maxY));
}
/// <summary>
/// Converts meters to pixels at latitude for zoom-level.
/// </summary>
/// <param name="meters">
/// the meters to convert </param>
/// <param name="latitude">
/// the latitude for the conversion. </param>
/// <param name="mapSize">
/// precomputed size of map. </param>
/// <returns> pixels that represent the meters at the given zoom-level and latitude. </returns>
public static double MetersToPixels(float meters, double latitude, long mapSize)
{
return(meters / MercatorProjection.CalculateGroundResolution(latitude, mapSize));
}
/// <summary>
/// Converts meters to pixels at latitude for zoom-level.
/// </summary>
/// <param name="meters">
/// the meters to convert </param>
/// <param name="latitude">
/// the latitude for the conversion. </param>
/// <param name="scaleFactor">
/// the scale factor for the conversion. </param>
/// <returns> pixels that represent the meters at the given zoom-level and latitude. </returns>
public static double MetersToPixelsWithScaleFactor(float meters, double latitude, double scaleFactor, int tileSize)
{
return(meters / MercatorProjection.CalculateGroundResolutionWithScaleFactor(latitude, scaleFactor, tileSize));
}
