/// <summary>
/// Create UTM boxes (can be full utm cell of partly utm cell (at edges map))
/// </summary>
/// <param name="pLatitudeLines">
/// </param>
/// <param name="pLongitudeLines">
/// </param>
/// <returns>
/// The <see cref="List"/>.
/// </returns>
private static List<GridZone> CalculateVisibleUtmBoxes(
List<double> pLatitudeLines,
List<double> pLongitudeLines)
{
var result = new List<GridZone>();
for (int i = 0; i < pLatitudeLines.Count - 1; i++)
{
for (int j = 0; j < pLongitudeLines.Count - 1; j++)
{
if ((pLatitudeLines[i] >= 72 && AlmostEqual(pLongitudeLines[j], 6))
|| (pLatitudeLines[i] >= 72 && AlmostEqual(pLongitudeLines[j], 18))
|| (pLatitudeLines[i] >= 72 && AlmostEqual(pLongitudeLines[j], 30)))
{
// do nothing
}
else
{
// Substract small
var dta = new GridZone(
pLatitudeLines[i],
pLatitudeLines[i + 1] - CorrectForZoneBorder,
pLongitudeLines[j],
pLongitudeLines[j + 1] - CorrectForZoneBorder);
result.Add(dta);
// Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0} {1} {2} {3}", dta.nlat, dta.wlng, dta.slat, dta.elng));
}
}
}
return result;
}
private void RenderMgrsGridCell(
DrawingContext pDC,
GridZone pCell)
{
var view = Viewport.Extend;
Point[] clipPolygon = new Point[]
{
new Point(pCell.Extend.WestBoundLongitude, pCell.Extend.NorthBoundLatitude),
new Point(pCell.Extend.EastBoundLongitude, pCell.Extend.NorthBoundLatitude),
new Point(pCell.Extend.EastBoundLongitude, pCell.Extend.SouthBoundLatitude),
new Point(pCell.Extend.WestBoundLongitude, pCell.Extend.SouthBoundLatitude)
};
int interval = (int)MgrsGridPrecision; // Number of meters
int precision = (int)MgrsGridPrecision;
var sw = pCell.SouthWest();
var ne = pCell.NorthEast();
var swUtm = sw.ConvertToUtm();
var neUtm = ne.ConvertToUtm();
var swMgrs = sw.ConvertToMgrs();
Debug.Assert(swUtm.Zone == neUtm.Zone, "UTM cell over multiple zones");
int utmZone = swUtm.Zone;
double sw_utm_e = (Math.Floor(swUtm.East / precision) * precision);
double sw_utm_n = (Math.Floor(swUtm.North / precision) * precision);
double ne_utm_e = (Math.Floor(neUtm.East / precision) * precision);
double ne_utm_n = (Math.Floor(neUtm.North / precision) * precision);
int numberOfCells = (((int)(Math.Abs(sw_utm_n - ne_utm_n) / interval)) * ((int)(Math.Abs(sw_utm_e - ne_utm_e) / interval)));
if (numberOfCells > 210)
{
return; // Safety check; takes to long to render
}
int count = 0;
for (double currentNorth = sw_utm_n; currentNorth <= ne_utm_n; currentNorth += interval)
{
for (double currentEast = sw_utm_e; currentEast <= ne_utm_e; currentEast += interval)
{
count++;
var lowerLeftLatLon = UTMtoLL(currentNorth, currentEast, utmZone, sw.Latitude >= 0 ? Geocentric.Hemisphere.North : Geocentric.Hemisphere.South); ;
var upperRightLatLon = UTMtoLL(currentNorth + interval, currentEast + interval, utmZone, sw.Latitude >= 0 ? Geocentric.Hemisphere.North : Geocentric.Hemisphere.South); ;
var lowerRightLatLon = UTMtoLL(currentNorth, currentEast + interval, utmZone, sw.Latitude >= 0 ? Geocentric.Hemisphere.North : Geocentric.Hemisphere.South); ;
var upperLeftLatLon = UTMtoLL(currentNorth + interval, currentEast, utmZone, sw.Latitude >= 0 ? Geocentric.Hemisphere.North : Geocentric.Hemisphere.South); ;
Point[] utm = new Point[]
{
new Point(upperLeftLatLon.Longitude, upperLeftLatLon.Latitude),
new Point(upperRightLatLon.Longitude, upperRightLatLon.Latitude),
new Point(lowerRightLatLon.Longitude, lowerRightLatLon.Latitude),
new Point(lowerLeftLatLon.Longitude, lowerLeftLatLon.Latitude),
};
var intersect = SutherlandHodgman.GetIntersectedPolygon(utm, clipPolygon);
if ((intersect != null) && (intersect.Length >= 4))
{
for (int i = 0; i < intersect.Length - 1; i++)
{
var p1 = Viewport.EsriMap.MapToScreen(WGS84LatLongPoint.Create(intersect[i].Y, intersect[i].X).ToEsriGeometry(102100));
var p2 = Viewport.EsriMap.MapToScreen(WGS84LatLongPoint.Create(intersect[i + 1].Y, intersect[i + 1].X).ToEsriGeometry(102100));
pDC.DrawLine(mMgrsLinePen, new Point(p1.X, p1.Y), new Point(p2.X, p2.Y));
}
var bb = new MgrsBoundingBox(intersect);
if (currentNorth + interval > ne_utm_n) RenderMgrsCellLabels(pDC, bb, currentNorth, currentEast, NorthEast.North);
if (currentEast + interval > ne_utm_e) RenderMgrsCellLabels(pDC, bb, currentNorth, currentEast, NorthEast.East);
RenderMgrsCenterLabel(pDC, bb, currentNorth, currentEast);
}
}
}
}