internal static double GetClosestScale(double scale, ZoomLevelSet zoomLevelSet)
{
double closestScale = double.NaN;
double closestScaleDiff = Double.MaxValue;
foreach (ZoomLevel item in zoomLevelSet.GetZoomLevels())
{
double currentScaleDiff = Math.Abs(item.Scale - scale);
if (currentScaleDiff < closestScaleDiff)
{
closestScaleDiff = currentScaleDiff;
closestScale = item.Scale;
}
}
return(closestScale);
}
internal static int GetSnappedZoomLevelIndex(double scale, ZoomLevelSet zoomLevelSet)
{
int zoomLevel = -1;
foreach (ZoomLevel item in zoomLevelSet.GetZoomLevels())
{
if (item.Scale >= scale || Math.Abs(item.Scale - scale) < 0.1)
{
zoomLevel++;
}
else
{
break;
}
}
return(zoomLevel == -1 ? 0 : zoomLevel);
}
public static void AddZoomLevels(this ZoomLevelSet zoomLevelSet, bool addExtraZoomLevels = true)
{
var zoomLevels = zoomLevelSet.GetZoomLevels();
if (zoomLevels.Count == 20)
{
foreach (var item in zoomLevels)
{
item.Scale = Math.Round(item.Scale, 6);
zoomLevelSet.CustomZoomLevels.Add(item);
}
if (addExtraZoomLevels)
{
for (int i = 0; i < 5; i++)
{
var currentScale = Math.Round(zoomLevelSet.CustomZoomLevels.LastOrDefault().Scale * 0.5, 6);
zoomLevelSet.CustomZoomLevels.Add(new ZoomLevel(currentScale));
}
}
}
}