/// <summary>
/// adds a circle shaped occluder
/// </summary>
/// <param name="position">Position.</param>
/// <param name="radius">Radius.</param>
public void AddCircleOccluder(System.Numerics.Vector2 position, float radius)
{
var dirToCircle = position - _origin;
var angle = Mathf.Atan2(dirToCircle.Y, dirToCircle.X);
var stepSize = MathHelper.Pi / LineCountForCircleApproximation;
var startAngle = angle + MathHelper.PiOver2;
var lastPt = Mathf.AngleToVector(startAngle, radius) + position;
for (var i = 1; i < LineCountForCircleApproximation; i++)
{
var nextPt = Mathf.AngleToVector(startAngle + i * stepSize, radius) + position;
AddLineOccluder(lastPt, nextPt);
lastPt = nextPt;
}
}
