WPF点补间、拟合回归直线

1，path画刷，绘制正弦 点，线；

生成正弦点

                profilePoint.Value =76 * (1 - Math.Sin(i * Math.PI / 92));
                profilePoint.Type = 1;

画点

            EllipseGeometry el = new EllipseGeometry();
            el.Center = p;
            el.RadiusX = 0.5;
            el.RadiusY = 0.5;
            
            Path mypath = new Path();
            mypath.Stroke = s;
            mypath.StrokeThickness = 1;
            mypath.Data = el;

            panelCanvas.Children.Add(mypath);

画线

            LineGeometry line = new LineGeometry();
            line.StartPoint = startPoint;
            line.EndPoint = endPoint;

            Path mypath = new Path();
            mypath.Stroke = s;
            mypath.StrokeThickness = 1;
            mypath.Data = line;

            panelCanvas.Children.Add(mypath);

2，回归直线

        /// <summary>
        /// 最小二乘法计算回归直线
        /// </summary>
        /// <param name="listPoints">最小二乘法计算单位</param>
        /// <returns></returns>
        public ApproximateLine calApproximateLine(List<Point> listPoints)
        {
            ApproximateLine appr = new ApproximateLine();
            double total = 0;       //临时变量
            double averageX = 0;    //X平均值
            double averageY = 0;    //Y平均值
            double dispersion = 0;  //协方差
            double b = 0;  //斜率
            double a = 0;  //y轴截距
            //x平均值计算
            total = 0;
            for (int i = 0; i < listPoints.Count; i++)
            {
                total += listPoints[i].X;
            }
            averageX = total / listPoints.Count;
            //y平均值计算
            total = 0;
            for (int i = 0; i < listPoints.Count; i++)
            {
                total += listPoints[i].Y;
            }
            averageY = total / listPoints.Count;
            //协方差计算
            total = 0;
            for (int i = 0; i < listPoints.Count; i++)
            {
                total += ((listPoints[i].Y - averageY)*(listPoints[i].X - averageX));
            }
            dispersion = total / listPoints.Count;
            //斜率计算
            total = 0;
            double tmp = 0;
            for (int i = 0; i < listPoints.Count; i++)
            {
                total += listPoints[i].Y * listPoints[i].X;
                tmp += Math.Pow(listPoints[i].X, 2);
            }
            b = (total - listPoints.Count*averageX*averageY)/(tmp - listPoints.Count*averageX*averageX);
            //截距计算
            a = averageY - b * averageX;
            //确定起止点坐标
            ScaleProfilePoint p1 = new ScaleProfilePoint();
            ScaleProfilePoint p2 = new ScaleProfilePoint();
            p1.Type = 1;
            p1.ValueX = listPoints[0].X;
            p1.ValueZ = a + b * p1.ValueX;
            p2.Type = 1;
            p2.ValueX = listPoints[listPoints.Count-1].X;
            p2.ValueZ = a + b * p2.ValueX;
            //填充返回值
            appr.Dispersion = dispersion;
            appr.Horizontal = true;
            appr.StartPnt = p1;
            appr.EndPnt = p2;
            return appr;
        }

3，去除canvas内的元素，清空画布

this.panelCanvas.Children.Clear();

 附上工程源码