public ZoomLevel GetNearestZoomLevel(double resolution)
{
InternalChecker.CheckArrayIsEmptyOrNull(zoomLevels, "ZoomLevels");
var orderedZoomLevels = zoomLevels.OrderByDescending(z => z.Resolution);
// smaller than smallest
if (orderedZoomLevels.Last().Resolution > resolution)
{
return(orderedZoomLevels.Last());
}
// bigger than biggest
if (orderedZoomLevels.First().Resolution < resolution)
{
return(orderedZoomLevels.First());
}
ZoomLevel result = null;
double resultDistance = double.MaxValue;
foreach (var current in orderedZoomLevels)
{
double distance = Math.Abs(current.Resolution - resolution);
if (distance < resultDistance)
{
result = current;
resultDistance = distance;
}
}
return(result);
}
public Pixel GetDrawingPosition(int viewPortWidth, int viewPortHeight)
{
InternalChecker.CheckParameterIsNull(ZoomLevel, "ZoomLevel");
double pixelX = Extent.MinX / ZoomLevel.Resolution;
double pixelY = Extent.MaxX / ZoomLevel.Resolution;
return(new Pixel((float)pixelX, (float)pixelY));
}
private ZoomLevel GetZoomLevel()
{
InternalChecker.CheckParameterIsNull(TileSchema, "Schema");
double resolutionX = Extent.Width / Width;
double resolutionY = Extent.Height / Height;
double resolution = Math.Max(resolutionX, resolutionY);
return(TileSchema.GetNearestZoomLevel(resolution));
}
