// from http://dominoc925.blogspot.com/2012/02/c-code-snippet-to-determine-if-point-is.html
public static bool IsPointInPolygon(CoordinatePair[] polygon, CoordinatePair point)
{
bool isInside = false;
for (int i = 0, j = polygon.Length - 1; i < polygon.Length; j = i++)
{
if (((polygon[i].Y > point.Y) != (polygon[j].Y > point.Y)) &&
(point.X < (polygon[j].X - polygon[i].X) * (point.Y - polygon[i].Y) / (polygon[j].Y - polygon[i].Y) + polygon[i].X))
{
isInside = !isInside;
}
}
return isInside;
}
public void CreatePoints(CoordinatePair[] polygon, int[] featureValues)
{
if (featureValues.Length != features.Length) throw new ArgumentException("featureValues");
var bounds = getBounds(polygon);
int total = featureValues.Sum();
Console.WriteLine("Total dots: {0}", total);
for (int k=0;k<features.Length;k++)
{
for (int i = 0; i < featureValues[k]; i++)
{
if (i % 10000 == 0) Console.Write(".");
CoordinatePair point = null;
while (true)
{
point = new CoordinatePair()
{
X = createRandomValue(bounds[0], bounds[2]),
Y = createRandomValue(bounds[1], bounds[3])
};
if (Utils.IsPointInPolygon(polygon, point)) break;
}
var mPoint = merc.LatLonToMeters(point.Y, point.X);
var tileAddress = merc.MetersToTile(mPoint.X, mPoint.Y, 21);
var quadkey = merc.QuadTree(tileAddress.X, tileAddress.Y, 21);
var person = new Person()
{
Pos = mPoint,
FeatureIndex = k
};
people.Add(Tuple.Create(quadkey, person));
}
}
Console.WriteLine("");
}
public CoordinatePair PixelsToMeters(double px, double py, int zoom)
{
CoordinatePair retval = new CoordinatePair();
try
{
var res = Resolution(zoom);
retval.X = px * res - this.originShift;
retval.Y = py * res - this.originShift;
return retval;
}
catch (Exception ex)
{
throw ex;
}
}
public CoordinatePair MetersToPixels(double mx, double my, int zoom)
{
CoordinatePair retval = new CoordinatePair();
try
{
var res = Resolution(zoom);
retval.X = (mx + this.originShift) / res;
retval.Y = (my + this.originShift) / res;
return retval;
}
catch (Exception ex)
{
throw ex;
}
}
public CoordinatePair MetersToLatLon(double mx, double my)
{
CoordinatePair retval = new CoordinatePair();
try
{
retval.X = (mx / this.originShift) * 180.0;
retval.Y = (my / this.originShift) * 180.0;
retval.Y = 180 / Math.PI * (2 * Math.Atan(Math.Exp(retval.Y * Math.PI / 180.0)) - Math.PI / 2.0);
return retval;
}
catch (Exception ex)
{
throw ex;
}
}
public CoordinatePair LatLonToMeters(double lat, double lon)
{
CoordinatePair retval = new CoordinatePair();
try
{
retval.X = lon * this.originShift / 180.0;
retval.Y = Math.Log(Math.Tan((90 + lat) * Math.PI / 360.0)) / (Math.PI / 180.0);
retval.Y *= this.originShift / 180.0;
return retval;
}
catch (Exception ex)
{
throw ex;
}
}
protected double[] getBounds(CoordinatePair[] polygon)
{
double ll = Double.MaxValue;
double bb = Double.MaxValue;
double rr = Double.MinValue;
double tt = Double.MinValue;
foreach (CoordinatePair p in polygon)
{
ll = Math.Min(ll, p.X);
rr = Math.Max(rr, p.X);
bb = Math.Min(bb, p.Y);
tt = Math.Max(tt, p.Y);
}
return new double[] { ll, bb, rr, tt };
}
