/// <summary>
/// Finds the map tile that contains the given point on the given zoom level. The point must be within <see cref="MapLeaf.GridBounds"/>.
/// </summary>
/// <param name="point">the point that should reside inside the returned map tile</param>
/// <param name="zoomLevel">the zoom level of the returned map tile</param>
/// <returns>the map tile that contains the given point</returns>
/// <exception cref="ArgumentOutOfRangeException">if the point is outside the grid bounds</exception>
public static MapTile FindMapTileContainingPoint(EtrsTm35FinPoint point, MapTileZoomLevel zoomLevel)
{
if (!MapLeaf.GridBounds.Contains(point))
{
throw new ArgumentOutOfRangeException("point");
}
double width = zoomLevel.PixelsToMetersOnXAxis(TileSizeInPixels);
double height = zoomLevel.PixelsToMetersOnYAxis(TileSizeInPixels);
int column = (int)((point.Easting - MapLeaf.WestGridBound) / width);
int row = (int)((point.Northing - MapLeaf.SouthGridBound) / height);
return(new MapTile(zoomLevel, column, row));
}
/// <summary>
/// Creates a new map tile.
/// </summary>
/// <param name="zoomLevel">the zoom level of the tile</param>
/// <param name="column">the column of the tile</param>
/// <param name="row">the row of the tile</param>
public MapTile(MapTileZoomLevel zoomLevel, int column, int row)
{
ZoomLevel = zoomLevel;
if (column < 0)
{
throw new ArgumentOutOfRangeException("column");
}
Column = column;
if (row < 0)
{
throw new ArgumentOutOfRangeException("row");
}
Row = row;
double width = ZoomLevel.PixelsToMetersOnXAxis(TileSizeInPixels);
double height = ZoomLevel.PixelsToMetersOnYAxis(TileSizeInPixels);
var southWestPoint = new EtrsTm35FinPoint(
MapLeaf.SouthGridBound + row * height,
MapLeaf.WestGridBound + column * width);
if (!MapLeaf.GridBounds.ContainsX(southWestPoint.X))
{
throw new ArgumentOutOfRangeException("column");
}
if (!MapLeaf.GridBounds.ContainsY(southWestPoint.Y))
{
throw new ArgumentOutOfRangeException("row");
}
var northEastPoint = new EtrsTm35FinPoint(
southWestPoint.Northing + height,
southWestPoint.Easting + width);
Bounds = new GeoRect <EtrsTm35FinPoint>(southWestPoint, northEastPoint);
}
