OpenNest/OpenNest.Core/CNC/CuttingStrategy/LeadIns/LineLeadIn.cs

using System.Collections.Generic;
using OpenNest.Geometry;
using OpenNest.Math;

namespace OpenNest.CNC.CuttingStrategy
{
    public class LineLeadIn : LeadIn
    {
        public double Length { get; set; }
        public double ApproachAngle { get; set; } = 90.0;

        public override List<ICode> Generate(
            Vector contourStartPoint,
            double contourNormalAngle,
            RotationType winding = RotationType.CW
        )
        {
            var piercePoint = GetPiercePoint(contourStartPoint, contourNormalAngle);

            return new List<ICode>
            {
                new RapidMove(piercePoint),
                new LinearMove(contourStartPoint) { Layer = LayerType.Leadin },
            };
        }

        public override Vector GetPiercePoint(Vector contourStartPoint, double contourNormalAngle,
            RotationType winding = RotationType.CW)
        {
            var approachAngle = contourNormalAngle - Angle.HalfPI + Angle.ToRadians(ApproachAngle);
            return new Vector(
                contourStartPoint.X + Length * PortableMath.Cos(approachAngle),
                contourStartPoint.Y + Length * PortableMath.Sin(approachAngle)
            );
        }

        public override LeadIn Scale(double factor) =>
            new LineLeadIn { Length = Length * factor, ApproachAngle = ApproachAngle };
    }
}