public bool SetBounds(MapProjection projection, Size viewportSize)
{
// bounds in tile pixels from viewport size
//
var bounds = projection.GetTileBounds(TileMatrix.Scale, TileMatrix.TopLeft, viewportSize);
// tile column and row index bounds
//
var xMin = (int)Math.Floor(bounds.X / TileMatrix.TileWidth);
var yMin = (int)Math.Floor(bounds.Y / TileMatrix.TileHeight);
var xMax = (int)Math.Floor((bounds.X + bounds.Width) / TileMatrix.TileWidth);
var yMax = (int)Math.Floor((bounds.Y + bounds.Height) / TileMatrix.TileHeight);
xMin = Math.Max(xMin, 0);
yMin = Math.Max(yMin, 0);
xMax = Math.Min(Math.Max(xMax, 0), TileMatrix.MatrixWidth - 1);
yMax = Math.Min(Math.Max(yMax, 0), TileMatrix.MatrixHeight - 1);
if (XMin == xMin && YMin == yMin && XMax == xMax && YMax == yMax)
{
return(false);
}
XMin = xMin;
YMin = yMin;
XMax = xMax;
YMax = yMax;
return(true);
}
