使用GDI画坐标曲线

//画速度曲线
            Graphics g = e.Graphics;
            g.DrawLine(Pens.White, 40, picChart.ClientRectangle.Height - 10, picChart.Width - 40, picChart.ClientRectangle.Height - 10);
            g.DrawLine(Pens.White, 40, picChart.ClientRectangle.Height - 50, picChart.Width - 40, picChart.ClientRectangle.Height - 50);
            g.DrawLine(Pens.White, 40, picChart.ClientRectangle.Height - 90, picChart.Width - 40, picChart.ClientRectangle.Height - 90);
            g.DrawLine(Pens.White, 40, picChart.ClientRectangle.Height - 130, picChart.Width - 40, picChart.ClientRectangle.Height - 130);

            Pen p = new Pen(Color.White, 1);
            //p.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
            //p.DashCap = System.Drawing.Drawing2D.DashCap.Flat; 
            AdjustableArrowCap aac = new AdjustableArrowCap(5, 5, false);//箭头的大小可以自己随便定义
            p.CustomEndCap = aac;
            g.DrawLine(p, 40, picChart.ClientRectangle.Height, 40, 4);
            g.DrawLine(p, picChart.Width - 40, picChart.ClientRectangle.Height, picChart.Width - 40, 4);
            p.Dispose();

            Font f = new Font("Arial", 9);
            //画线上箭头文字
            int stepY = (picChart.Height - 150) / 13;
            int curH = 0;
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Far;
            int du = 0;
            for (int i = 0; i < 13; i++)
            {
                bool jo = i % 2 == 0;
                int w = jo ? 10 : 5;
                g.DrawLine(Pens.White, 40 - w, picChart.ClientRectangle.Height - 130 - curH, 40, picChart.ClientRectangle.Height - 130 - curH);
                g.DrawLine(Pens.White, picChart.Width - 40, picChart.ClientRectangle.Height - 130 - curH, picChart.Width - (40 - w), picChart.ClientRectangle.Height - 130 - curH);

                if (jo)
                {
                    //如果是偶数
                    g.DrawString(du.ToString(), f, new SolidBrush(Color.White), 30, picChart.ClientRectangle.Height - 137 - curH, sf);
                    g.DrawString(du.ToString(), f, new SolidBrush(Color.White), picChart.Width - 30, picChart.ClientRectangle.Height - 137 - curH);

                    du += 40;
                }

                curH += stepY;
            }


            g.DrawString("道桥隧", f, new SolidBrush(Color.White), 0, picChart.ClientRectangle.Height - 30);
            g.DrawString("曲  线", f, new SolidBrush(Color.White), 0, picChart.ClientRectangle.Height - 70);
            g.DrawString("纵断面", f, new SolidBrush(Color.White), 0, picChart.ClientRectangle.Height - 110);
            f.Dispose();