DevExpress ChartControl 柱状图的使用

Posted 2020-11-18 mazhenyu

//中心业务平台的“热门岗位信息监测”柱状图

 

public partial class HotJobInfo : UserControl
    {
        private object _objLock = new object();

        private delegate void getDataHandler();

        /// <summary>
        /// 热门岗位数据
        /// </summary>
        private BarGraghData _barGraghData = null;

        public HotJobInfo()
        {
            InitializeComponent();
            //获取热门岗位数据
            //异步获取数据,绘制图表
            getDataHandler handler = new getDataHandler(GetHotJobDataInfo);
            IAsyncResult result = handler.BeginInvoke(new AsyncCallback(showLine), "AsycState:OK");
        }

        private void showLine(IAsyncResult result)
        {
            try
            {
                this.Invoke(
                            new Action(
                            delegate
                            {
                                //绘制图表
                                ToLineGragh();
                            }));
            }
            catch { }
        }

        /// <summary>
        /// 获取热门岗位信息数据
        /// </summary>
        private void GetHotJobDataInfo()
        {
            try
            {
                lock (_objLock)
                {
                    //向服务器请求数据
                    Random ran = new Random();
                    int sjd = ran.Next(1, 1000);
                    string addr = ConfigurationManager.AppSettings["ServiceAddr"].ToString();
                    //去掉地址结尾的‘/‘,否则请求中会出现两个‘/‘，而导致请求失败
                    string url = string.Format(@"{0}/JobInfoCheck/GetHotJob", addr[addr.Length - 1] != ‘/‘ ? addr : addr.Substring(0, addr.Length - 1));
                    string response = Utility.HttpResult.GetHttpRequest(url, sjd.ToString());
                    BarGraghDataJson result = Utility.JsonHelper.JsonDeserialize<BarGraghDataJson>(response);
                    if (result.IsOK)
                    {
                        BarGraghData data = result.Result;
                        _barGraghData = data;
                    }
                }
              
            }
            catch {}
        }

        /// <summary>
        /// 把接收到的数据转换额外柱状图表所需要的数据, 绘制图表
        /// </summary>
        private void ToLineGragh()
        {
            ChartControl chartControl = new ChartControl();
            if (_barGraghData != null)
            {
                DataTable table = new DataTable();
                //横坐标显示值
                table.Columns.Add("hName", typeof(string));
                //纵坐标显示值
                table.Columns.Add("value", typeof(int));
                for (int i = 0; i < _barGraghData.GWFLMC.Length; i++)
                {
                    DataRow row = table.NewRow();
                    row["hName"] = _barGraghData.GWFLMC[i];
                    row["value"] = _barGraghData.GWSL[i];
                    table.Rows.Add(row);
                }
                //动态生成一个柱状图表，调用下面的静态方法
                chartControl = ToBarGraph.GetChartControl("", 0, table, "hName", "hName", "value");
            }
            //纵坐标标题
            chartControl.Dock = DockStyle.Fill;
            this.panel1.Controls.Add(chartControl);
            //X轴刻度间隔设置
            XYDiagram xydiagram = (XYDiagram)chartControl.Diagram;
            xydiagram.AxisX.MinorCount = 1;
            //小刻度是否显示
            xydiagram.AxisX.Tickmarks.Visible = false;
            xydiagram.AxisX.Range.MinValueInternal = -0.5D;
        }
    }


    /// <summary>
    /// 热门岗位信息监测菜单
    /// </summary>
    public class HotjobMenu : BtnMenuBase
    {
        public override UserControl GetEditControl()
        {
            return new HotJobInfo();
        }
    }

 

 

 

/// <summary>
    /// 生成柱状图类
    /// </summary>
    public static class ToBarGraph
    {
        /// 获取图表
        /// </summary>
        /// <param name="titleName">图表名称</param>
        /// <param name="viewType">图表类型</param>
        /// <param name="dataSourse">数据源</param>
        /// <param name="textField1">显示文字字段</param>
        /// <param name="textField2">横坐标显示的文字字段</param>
        /// <param name="valueField">显示数值字段</param>
        /// <returns></returns>
        public static ChartControl GetChartControl(string titleName, ViewType viewType, DataTable dataSourse, string textField1, string textField2, string valueField)
        {
            ChartControl _ChartControl = new ChartControl();
            if (dataSourse == null || textField1 == "" || textField2 == "" || valueField == "")
            {
                return _ChartControl;
            }
            List<string> listTitle = new List<string>();
            foreach (DataRow item in dataSourse.Rows)
            {
                string title = item[textField1].ToString();
                if (listTitle.Contains(title))
                {
                    continue;
                }
                else
                {
                    listTitle.Add(title);
                    DataView dv = dataSourse.AsDataView();
                    dv.RowFilter = string.Format(" {0}=‘{1}‘ ", textField1, title);
                    DataTable dt = dv.ToTable();
                    // 柱状图里的第一个柱
                    Series Series1 = new Series(title, viewType);

                    Series1.ArgumentScaleType = ScaleType.Qualitative;
                    Series1.PointOptions.PointView = PointView.ArgumentAndValues;//显示表示的信息和数据
                    Series1.PointOptions.ValueNumericOptions.Precision = 0;
                    Series1.DataSource = dt;
                    //柱状图柱子的宽度设置
                    BarSeriesView bsv = (BarSeriesView)Series1.View;
                    bsv.BarWidth = 7;

                    // 以哪个字段进行显示
                    Series1.ArgumentDataMember = textField2;
                    Series1.ValueScaleType = ScaleType.Numerical;

                    // 柱状图里的柱的取值字段
                    Series1.ValueDataMembers.AddRange(new string[] { valueField });
                    Series1.LegendText = title;
                    _ChartControl.Series.Add(Series1);
                }
            }
            return _ChartControl;
        }

    }