namespace IStation.Curve
{
    /// <summary>
    /// 装置曲线辅助类
    /// </summary>
    public class DeviceCurveHelper
    {

        /// <summary>
        /// 
        /// </summary>
        /// <param name="CurveExpressQH"></param>
        /// <param name="designPoint"></param>
        /// <param name="deviceCurveZeroH"></param>
        /// <param name="isExendCurve">当designPoint超过曲线时, 是否延长装置线到designPoint位置</param>
        /// <param name="fitPointNum"></param>
        /// <param name="sectPoint"></param>
        /// <returns></returns>
        public static DeviceCurve CalcuDeviceCurve(CurveExpress CurveExpressQH, CurvePoint designPoint, double deviceCurveZeroH, bool isExendCurve, int fitPointNum, out CurvePoint sectPoint)
        {
            sectPoint = GetSectPoint(CurveExpressQH, designPoint, deviceCurveZeroH);
            if (sectPoint == null)
            {
                return null;
            }
            if (isExendCurve)
            {
                IStation.Curve.CurvePoint endPt;
                if (sectPoint.X > designPoint.X)
                    endPt = sectPoint;
                else
                    endPt = designPoint;

                //
                return new IStation.Curve.DeviceCurve(deviceCurveZeroH, endPt, fitPointNum, CurveExpressQH.FitType);
            }
            else
            {
                return new IStation.Curve.DeviceCurve(deviceCurveZeroH, sectPoint, fitPointNum, CurveExpressQH.FitType);
            }
        }

        /// <summary>
        /// 
        /// </summary>
        public static CurvePoint GetSectPoint(CurveExpress CurveExpressQH, CurvePoint designPoint, double equipCurveZeroH)
        {//有一种情况: 用包络法有交点(在最末尾),但用装置曲线绘制时,与装置曲线没有交点,因为交点已超过曲线最大值
            double ratioExtend = 1.15;//CurveExpressQH适当延长一点
            var sectPoint = ParabolaCurveHelper.GetSectPoint(CurveExpressQH, designPoint, equipCurveZeroH, ratioExtend);
            if (sectPoint == null || sectPoint.IsZeroPoint())
            {
                return null;
            }
            if (sectPoint.X > CurveExpressQH.Max * ratioExtend)
            {
                return null;
            }

            return sectPoint;
        }

        /// <summary>
        /// 
        /// </summary>
        public static CurvePoint GetSectPoint(CurveExpress CurveExpressQH, CurvePoint DesignPoint, double equipCurveZeroH, double ratioExtend)
        {//有一种情况: 用包络法有交点(在最末尾),但用装置曲线绘制时,与装置曲线没有交点,因为交点已超过曲线最大值

            var sectPoint = ParabolaCurveHelper.GetSectPoint(CurveExpressQH, DesignPoint, equipCurveZeroH, ratioExtend);
            if (sectPoint == null || sectPoint.IsZeroPoint())
            {
                return null;
            }
            if (sectPoint.X > CurveExpressQH.Max * ratioExtend)
            {
                return null;
            }

            return sectPoint;
        }

    }
}