namespace IStation.Curve
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{
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/// <summary>
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/// 不拟合
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/// </summary>
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public class TwinRelateCurve0 : IFitPoint
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{
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/// <summary>
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///
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/// </summary>
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public TwinRelateCurve0(CurveExpress express)
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{
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_express = express;
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}
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/// <summary>
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///
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/// </summary>
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public TwinRelateCurve0(List<CurvePoint> points)
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{
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if (points == null || points.Count < 4)
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{
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throw new Exception("出现数值计算问题, 无法解出不拟合线！");
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}
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_express = BuildCurveExpress(points);
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}
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//曲线表达式
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private CurveExpress _express = null;
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/// <summary>
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/// 获取拟合点Y
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/// </summary>
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public double GetFitPointY(double x)
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{
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if (_express == null)
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{
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return default;
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}
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//尽量用贝塞尔曲线
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if (_express.DefinePoints != null && _express.DefinePoints.Count > 4)
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{
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var b = BezierCurveHelper.CreateOpenCurves(_express.DefinePoints);
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var s = BezierCurveHelper.GetSectPointsByX(b, x);
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if (s != null && s.Count > 0)
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{
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return s.Last().Y;
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}
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}
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if (_express.DefinePoints != null && _express.DefinePoints.Count > 1)
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{
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var sect = _express.DefinePoints.GetInterPointY(x);
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if (sect == null || sect.Count < 1)
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{
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return default;
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}
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return sect.First();
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}
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return default;
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}
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/// <summary>
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/// 获取拟合点列表
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/// </summary>
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public List<CurvePoint> GetFitPoints(int pointNumber)
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{
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if (_express == null)
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{
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return default;
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}
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return _express.DefinePoints;
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}
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/// <summary>
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/// 通过X区间获取拟合点列表
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/// </summary>
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public List<CurvePoint> GetFitPointsByXRange(double minX, double maxX, int pointNumber)
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{
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if (_express == null)
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{
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return default;
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}
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return _express.DefinePoints;
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}
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/// <summary>
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/// 创建曲线表达式
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/// </summary>
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public static CurveExpress BuildCurveExpress(List<CurvePoint> points)
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{
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if (points == null || points.Count < 4)
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{
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return default;
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}
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points = points.OrderBy(x => x.X).ToList();
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var express = new CurveExpress
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{
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FitType = eFitType.ThroughPoint,
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DefinePoints = points.Select(x => new CurvePoint(x)).ToList()
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};
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express.Min = points.Min(x => x.X);
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express.Max = points.Max(x => x.X);
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return express;
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}
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}
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}
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