public static Feature Along(LineString line, double distance, string units = "kilometers")
{
var coords = line.Coordinates;
double travelled = 0;
for (var i = 0; i < coords.Count; i++)
{
if (distance >= travelled && i == coords.Count - 1)
{
break;
}
else if (travelled >= distance)
{
var overshot = distance - travelled;
if (Math.Abs(overshot) < double.Epsilon)
{
return(Turf.Point(coords[i]));
}
else
{
var direction = Turf.Bearing(coords[i], coords[i - 1]) - 180;
var interpolated = Turf.Destination(coords[i], overshot, direction, units);
return(interpolated);
}
}
else
{
travelled += Turf.Distance(coords[i], coords[i + 1], units);
}
}
return(Turf.Point(coords[coords.Count - 1]));
}
/**
* Takes a {@link Point} and calculates the circle polygon given a radius in degrees, radians, miles, or kilometers; and steps for precision.
*
* @name circle
* @param {Feature<Point>} center center point
* @param {number} radius radius of the circle
* @param {number} [steps=64] number of steps
* @param {string} [units=kilometers] miles, kilometers, degrees, or radians
* @returns {Feature<Polygon>} circle polygon
* @example
* var center = point([-75.343, 39.984]);
* var radius = 5;
* var steps = 10;
* var units = 'kilometers';
*
* var circle = turf.circle(center, radius, steps, units);
*
* //=circle
*/
public static Feature Circle(Feature center, double radius, int steps = 64, string units = "kilometers")
{
List <IPosition> coordinates = new List <IPosition>();
for (var i = 0; i < steps; i++)
{
coordinates.Add(((Point)Turf.Destination(center, radius, i * 360 / steps, units).Geometry).Coordinates);
}
coordinates.Add(coordinates[0]);
return(new Feature(
new Polygon(new List <LineString>()
{
new LineString(coordinates)
})
));
}