public PointD GetPixelPoint(GeoPoint geoPoint)
{
// get a bearing to the point from our known point
double geoBearing = EarthGeo.GetBearing(this.GeoPoint, geoPoint);
double geoDistance = EarthGeo.GetDistance(this.GeoPoint, geoPoint);
double pixBearing = FlatGeo.Radians(((geoBearing + 360) - this.BearingDelta) % 360);
double pixDistance = geoDistance * this.PixelsPerMeter;
PointD ret = new PointD(this.PixPoint.X + (Math.Sin(pixBearing) * pixDistance), this.PixPoint.Y - (Math.Cos(pixBearing) * pixDistance));
return(ret);
}
void Initialize(PointDList pixPointList, GeoPointList geoPointList)
{
// Get and store the difference in pixel orientation to north (Rotation from north)
double geoBearing = EarthGeo.GetBearing(geoPointList[0], geoPointList[1]);
double pixBearing = GetPixelBearing(pixPointList[0], pixPointList[1]);
this.BearingDelta = geoBearing - pixBearing;
// Get and store the pixel to meter ratio (Scale to meters)
double geoDistance = EarthGeo.GetDistance(geoPointList[0], geoPointList[1]);
double pixDistance = new Line(pixPointList[0], pixPointList[1]).Length;
_pixelsPerMeter = pixDistance / geoDistance;
// Store a pixel cross reference point, from which all other conversions can happen
this.PixPoint = new PointD(pixPointList[0].X, pixPointList[0].Y);
this.GeoPoint = new GeoPoint(geoPointList[0].Y, geoPointList[0].X);
}