/// <summary>
/// Gets the deviation angle of 3 points.
/// </summary>
/// <param name="pointA">The point a.</param>
/// <param name="pointO">The point o.</param>
/// <param name="pointB">The point b.</param>
/// <param name="isNegativeOffset">if set to <c>true</c> [is negative offset].</param>
/// <returns></returns>
private double GetAOBAngle(LRSPoint pointA, LRSPoint pointO, LRSPoint pointB, bool isNegativeOffset)
{
const double angleCorrection = Math.PI / 2;
const double angleConversion = 2 * Math.PI;
var atanAo = pointA.GetAtanInRadian(pointO) + angleCorrection;
var atanBo = pointB.GetAtanInRadian(pointO) + angleCorrection;
// angle conversion
atanAo = SpatialUtil.ToDegrees(atanAo <= 0 ? angleConversion + atanAo : atanAo);
atanBo = SpatialUtil.ToDegrees(atanBo <= 0 ? angleConversion + atanBo : atanBo);
var deviationAngle =
360 - (atanAo > atanBo
? 360 - (atanAo - atanBo)
: atanBo - atanAo);
// for positive offset; offset curve will be to the left of input geom;
// so for positive deviation angle the computed angle should be subtracted from 360
// for negative offset; offset curve will be to the right of input geom
return(isNegativeOffset ? deviationAngle : 360 - deviationAngle);
}
/// <summary>
/// Gets the atan2 in degrees.
/// This does angle correct when atan2 value is negative
/// </summary>
/// <param name="point1">The point1.</param>
/// <param name="point2">The point2.</param>
/// <returns>Atan2 in degrees</returns>
private double GetAtanInDegree(LRSPoint point1, LRSPoint point2)
{
var atan = point1.GetAtanInRadian(point2);
return(SpatialUtil.ToDegrees(atan <= 0 ? (2 * Math.PI) + atan : atan));
}