/// <summary>
/// Calculates a zoom factor of a tile matrix.
/// </summary>
/// <param name="tileMatrix">Tile matrix to calculate the zoom for.</param>
/// <returns>Zoom factor</returns>
private static double CalculateZoom(ITileMatrix tileMatrix)
{
// calculate the logical bounds of a single tile
var logicalSize = new SizeF(
(float)(Math.Abs(tileMatrix.BottomRightCorner.X - tileMatrix.TopLeftCorner.X) / tileMatrix.MatrixWidth),
(float)(Math.Abs(tileMatrix.TopLeftCorner.Y - tileMatrix.BottomRightCorner.Y) / tileMatrix.MatrixHeight)
);
// get the pixel size of a tile directly provided by the tile matrix
var pixelSize = new Size(tileMatrix.TileWidth, tileMatrix.TileHeight);
// use CalculateZoom with the logical bounds and the pixel size to
// calculate a representative zoom factor for the tile matrix
return(CalculateZoom(logicalSize, pixelSize));
}
/// <summary> /// Determines the minimum value for the y-coordinate of a tile. /// </summary> /// <param name="tileMatrix">The tile matrix to determine the value for.</param> /// <returns>Minimum value.</returns> public static int MinY(this ITileMatrix tileMatrix) => Math.Min(0, tileMatrix.MatrixMinY.GetValueOrDefault(0));
/// <summary> /// Determines the maximum value for the y-coordinate of a tile. /// </summary> /// <param name="tileMatrix">The tile matrix to determine the value for.</param> /// <returns>Maximum value.</returns> public static int MaxY(this ITileMatrix tileMatrix) => Math.Min(tileMatrix.MatrixHeight - 1, tileMatrix.MatrixMaxY.GetValueOrDefault(tileMatrix.MatrixHeight - 1));
/// <summary> /// Determines the maximum value for the x-coordinate of a tile. /// </summary> /// <param name="tileMatrix">The tile matrix to determine the value for.</param> /// <returns>Maximum value.</returns> public static int MaxX(this ITileMatrix tileMatrix) => Math.Min(tileMatrix.MatrixWidth - 1, tileMatrix.MatrixMaxX.GetValueOrDefault(tileMatrix.MatrixWidth - 1));
