/// <summary>
/// Gets a map tile with geofences drawn on it.
/// </summary>
/// <param name="parameters">Map parameters such as bounding box, tile size, zoom level etc.</param>
/// <param name="sites">List of geofences for the customer</param>
/// <returns>A bitmap</returns>
private byte[] GetGeofencesBitmap(MapParameters parameters, IEnumerable <GeofenceData> sites, bool isSites)
{
log.LogInformation("GetGeofencesBitmap");
const int DEFAULT_SITE_COLOR = 0x0055FF;
byte[] sitesImage = null;
if (sites != null && sites.Any())
{
// Exclude sites that are too small to be displayed in the current viewport.
double viewPortArea = Math.Abs(parameters.bbox.minLatDegrees - parameters.bbox.maxLatDegrees) * Math.Abs(parameters.bbox.minLngDegrees - parameters.bbox.maxLngDegrees);
double minArea = viewPortArea / 10000;
using (Image <Rgba32> bitmap = new Image <Rgba32>(parameters.mapWidth, parameters.mapHeight))
{
foreach (var site in sites)
{
log.LogDebug($"GetGeofencesBitmap examining site {site.GeofenceUID}");
//Old geofences may not have AreaSqMeters set.
if (site.AreaSqMeters > 0 && site.AreaSqMeters < minArea)
{
log.LogDebug($"GetGeofencesBitmap excluding site {site.GeofenceUID} due to area");
continue;
}
var sitePoints = site.GeometryWKT.GeometryToPoints().ToList();
//Exclude site if outside bbox
bool outside = TileServiceUtils.Outside(parameters.bbox, sitePoints);
if (outside)
{
log.LogDebug($"GetGeofencesBitmap excluding site {site.GeofenceUID} outside bbox");
}
else
{
int siteColor = site.FillColor > 0 ? site.FillColor : (isSites ? DEFAULT_SITE_COLOR : DEFAULT_CUSTOM_BOUNDARY_COLOR);
bool transparent = isSites ? site.IsTransparent : true;
DrawGeofence(parameters, bitmap, site.GeofenceUID.ToString(), sitePoints, siteColor, transparent);
}
}
sitesImage = bitmap.BitmapToByteArray();
}
}
return(sitesImage);
}
public void PolygonOutsideBoundingBox()
{
var bbox = new MapBoundingBox
{
minLat = 36.0, minLng = -115.9, maxLat = 36.5, maxLng = -115.0
};
var points = new List <WGSPoint>
{
new WGSPoint(35.0, -116.0),
new WGSPoint(35.5, -116.0),
new WGSPoint(35.5, -116.5),
new WGSPoint(35.0, -116.5),
new WGSPoint(35.0, -116.0),
};
Assert.True(TileServiceUtils.Outside(bbox, points));
}
public void PolygonIntersectsBoundingBox()
{
var bbox = new MapBoundingBox
{
minLat = 36.0,
minLng = -115.9,
maxLat = 36.5,
maxLng = -115.0
};
var points = new List <WGSPoint>
{
new WGSPoint(35.9, -115.5),
new WGSPoint(36.3, -115.5),
new WGSPoint(36.3, -115.7),
new WGSPoint(35.9, -115.7),
new WGSPoint(35.9, -115.5),
};
Assert.False(TileServiceUtils.Outside(bbox, points));
}
