根据血压情况的曲线图

Question

用的是C#winform，数据库用的是sql sever 2008想要做一个这样的功能：
text框是血压值，点击button就可以保存到数据库中，然后界面有曲线图（趋势图）表现出来，类似这样：

数据保存这部分做好了，曲线图这部分不知道怎么下手，希望大佬们帮帮我（真挚的感谢）

Answer 1

int pbHeight = PBth.Height, pbWidtht = PBth.Width;
Graphics g = PBth.CreateGraphics();

try
{
//清空图片背景色
g.Clear(Color.White);
DateTime ssss = DateTime.Parse(DtpTH.Text.ToString());
Font font = new System.Drawing.Font("Arial", 9, FontStyle.Regular);
Font font1 = new System.Drawing.Font("宋体", 20, FontStyle.Regular);
Font font2 = new System.Drawing.Font("Arial", 8, FontStyle.Regular);
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, pbWidtht, pbHeight), Color.Blue, Color.Blue, 1.2f, true);
g.FillRectangle(Brushes.AliceBlue, 0, 0, pbWidtht, pbHeight);
Brush brush1 = new SolidBrush(Color.Blue);
Brush brush2 = new SolidBrush(Color.SaddleBrown);

            g.DrawString(cobRo.SelectedItem+"节点"+ DtpTH.Text.ToString() + "温湿度变化折线图", font1, brush1, new PointF(pbWidtht/2-250, 30));
            //画图片的边框线
            g.DrawRectangle(new Pen(Color.Blue), 0, 0, pbWidtht - 1, pbHeight - 1);

            Pen mypen = new Pen(brush, 1);
            Pen mypen2 = new Pen(Color.Red, 2);
            //绘制线条
            //绘制纵向线条

            int Ww = (pbWidtht - 100) / 24;
            int x = 60;
            for (int i = 0; i < 24; i++)
            {
                g.DrawLine(mypen, x, 80, x, 331);
                x = x + Ww;
            }
            Pen mypen1 = new Pen(Color.Blue, 3);
            //x = 60;
            g.DrawLine(mypen1,60, 82, 60, 331);

            //绘制横向线条
            int y = 106;
            for (int i = 0; i < 10; i++)
            {
                g.DrawLine(mypen, 60, y, x, y);
                y = y + 25;
            }
            // y = 106;
            g.DrawLine(mypen1, 60, y - 25, x, y - 25);

            //x轴
            String[] n = { "0时", "1时", "2时", "3时", "4时", "5时", "6时", "7时", "8时", "9时", "10时", "11时", "12时", "13时", "14时", "15时", "16时", "17时", "18时", "19时", "20时", "21时", "22时", "23时" };
            x = 45;
            for (int i = 0; i < 24; i++)
            {
                g.DrawString(n[i].ToString(), font, Brushes.Black, x, 348); //设置文字内容及输出位置
                x = x + Ww;
            }
            //y轴
            String[] m = { "50","45", "40", "35", "30", "25", "20", "15", "10", "5","0" };
            y = 98-25;
            for (int i = 0; i < 11; i++)
            {
                g.DrawString(m[i].ToString(), font, Brushes.Black, 35, y); //设置文字内容及输出位置
                y = y + 25;
            }

            conn.Open();
            string cmdtxt2 = "select * from  remote_THinfo  where remote_address='" + cobRo.SelectedItem + "' and addTime between '"+ ssss.ToString("yyyy/MM/dd") + " 00:00:01' and '" + ssss.ToString("yyyy/MM/dd") + " 23:59:59'";
            SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, conn);
            DataTable dt = new DataTable("remote_THinfo");
            da.Fill(dt);
            int PointNum = dt.Rows.Count;
            if (PointNum < 2)
            {
                return;
            }

            int[] Count1 = new int[PointNum];
            int[] Count2 = new int[PointNum];
            //温湿度
            for (int i = 0; i < PointNum; i++)
            {
                Count1[i] = int.Parse(dt.Rows[i]["Temperature"].ToString());
                Count2[i] = int.Parse(dt.Rows[i]["Humidity"].ToString());
            }

            //显示折线效果
            Font font3 = new System.Drawing.Font("Arial", 10, FontStyle.Bold);
            SolidBrush mybrush = new SolidBrush(Color.Red);
            Point[] points1 = new Point[PointNum];
            for (int i = 0; i < PointNum; i++)
            {
                points1[i].X = 60 + Ww * i; points1[i].Y = 331 - Count1[i] * 5;
                g.DrawString(Count1[i].ToString() + "℃", font3, Brushes.Red, 58 + i * Ww, points1[i].Y - 20);
            }
            g.DrawLines(mypen2, points1); //绘制折线

            Pen mypen3 = new Pen(Color.Green, 2);
            Point[] points2 = new Point[PointNum];
            for (int i = 0; i < PointNum; i++)
            {
                points2[i].X = 60 + i * Ww; points2[i].Y = 331 - Count2[i] * 5;
                g.DrawString(Count2[i].ToString() + "%", font3, Brushes.Green, 61 + i * Ww, points2[i].Y - 15);
            }

            g.DrawLines(mypen3, points2); //绘制折线              

            //绘制标识
            g.DrawRectangle(new Pen(Brushes.Red), pbWidtht / 2 - 155, 390, 250, 50); //绘制范围框
            g.FillRectangle(Brushes.Red, pbWidtht / 2 - 50, 402, 20, 10); //绘制小矩形
            g.DrawString("温度", font2, Brushes.Red, pbWidtht / 2 - 30, 400);

            g.FillRectangle(Brushes.Green, pbWidtht / 2 - 50, 422, 20, 10);
            g.DrawString("湿度", font2, Brushes.Green, pbWidtht / 2 - 30, 420);

            System.IO.MemoryStream ms = new System.IO.MemoryStream();

        }
        catch (Exception ex)
        {
            tools.WriteLog(ex,"");
        }
        finally
        {
            conn.Close();
            g.Dispose();
            //PBth.Dispose();
        }           
        ![图片说明](https://img-ask.csdn.net/upload/202006/04/1591262895_436067.png)