• ZedGraph


     

     若要定时的向一个图表里添加数据,应按照如下顺序实现:

      1.在GraphPane.CurveList集合中查找CurveItem

      2.在CurveItem中访问PointPairList(或者其它的IPointList),根据自己的需要增加新数据或修改已存在的数据

      3.调用ZedGraphControl.AxisChange()方法更新X和Y轴的范围

      4.调用Form.Invalidate()方法更新图表

       /*翻译的不准,大概意思就是找到数据集合后增加/修改数据->修改轴范围->更新图表*/

    每个CurveItem里的数据点作为一个IPointList接口的引用存储在CurveItem.Points中.

      注意数据点列表能被任意一个实现了 IPointList的接口的类引用.当然,此类需要同时实现IPoiontListEdit(),IpointListEdit.Add()和 IPontListEdit.RemoveAt()方法.

    代码示例为一个ZedGraph控件在WinForm中的实现,用Timer事件动态显示更新数据.

      以下是完整代码(没有VS设计资料).。

      此代码包括两个方法:

        Form_Load()方法用一条没有数据点的曲线初始化图表,

        Timer_Tick()方法响应timer事件增加数据点. 

     1 using System; 
     2 using System.Collections.Generic; 
     3 using System.ComponentModel; 
     4 using System.Data; 
     5 using System.Drawing; 
     6 using System.Text; 
     7 using System.Windows.Forms; 
     8 using ZedGraph; 
     9 namespace DynamicData 
    10 { 
    11     public partial class Form1 : Form
    12     { 
    13     // Starting time in milliseconds 
    14 
    15         int tickStart = 0; 
    16         public Form1() 
    17         { 
    18             InitializeComponent(); 
    19         } 
    20         private void Form1_Load( object sender, EventArgs e ) 
    21       { 
    22       //获取引用 
    23       GraphPane myPane = zedGraphControl1.GraphPane; 
    24 
    25 
    26         //设置标题 
    27       myPane.Title.Text = "Test of Dynamic Data Update with ZedGraph " + "(After 25 seconds the graph scrolls)"; 
    28         //设置X轴说明文字
    29        myPane.XAxis.Title.Text = "Time, Seconds"; 
    30         //设置Y轴文字 
    31       myPane.YAxis.Title.Text = "Sample Potential, Volts"; 
    32         // Save 1200 points. At 50 ms sample rate, this is one minute 
    33       // The RollingPointPairList is an efficient storage class that always 
    34       // keeps a rolling set of point data without needing to shift any data values 
    35       //设置1200个点,假设每50毫秒更新一次,刚好检测1分钟 
    36       //一旦构造后将不能更改这个值 
    37       RollingPointPairList list = new RollingPointPairList( 1200 ); 
    38     // Initially, a curve is added with no data points (list is empty) // Color is blue, and there will be no symbols 
    39     //开始,增加的线是没有数据点的(也就是list为空) 
    40     //增加一条名称:Voltage,颜色Color.Bule,无符号,无数据的空线条 
    41       LineItem curve = myPane.AddCurve( "Voltage", list, Color.Blue, SymbolType.None ); 
    42     // Sample at 50ms intervals 
    43     //设置timer控件的间隔为50毫秒 
    44       timer1.Interval = 50; 
    45     //timer可用 
    46       timer1.Enabled = true; 
    47     //开始 
    48       timer1.Start(); 
    49     // Just manually control the X axis range so it scrolls continuously 
    50     // instead of discrete step-sized jumps 
    51     //X轴最小值0
    52        myPane.XAxis.Scale.Min = 0; 
    53     //X轴最大30 
    54       myPane.XAxis.Scale.Max = 30; 
    55     //X轴小步长1,也就是小间隔 myPane.XAxis.Scale.MinorStep = 1; 
    56     //X轴大步长为5,也就是显示文字的大间隔
    57        myPane.XAxis.Scale.MajorStep = 5; 
    58     // Scale the axes
    59      //改变轴的刻度 
    60       zedGraphControl1.AxisChange(); 
    61     // Save the beginning time for reference 
    62     //保存开始时间 
    63       tickStart = Environment.TickCount; } 
    64 
    65 
    66 
    67     private void timer1_Tick( object sender, EventArgs e ) 
    68     { 
    69         // Make sure that the curvelist has at least one curve 
    70         //确保CurveList不为空
    71       if ( zedGraphControl1.GraphPane.CurveList.Count <= 0 ) return; 
              // Get the first CurveItem in the graph 72         // 取Graph第一个曲线,也就是第一步:在GraphPane.CurveList集合中查找CurveItem LineItem curve = zedGraphControl1.GraphPane.CurveList[0]
      as LineItem; if ( curve == null ) return;
    73         // Get the PointPairList 74         //第二步:在CurveItem中访问PointPairList(或者其它的IPointList),根据自己的需要增加新数据或修改已存在的数据 75       IPointListEdit list = curve.Points as IPointListEdit; 76         // If this is null, it means the reference at curve.Points does not 77         // support IPointListEdit, so we won't be able to modify it if ( list == null ) return; 78         // Time is measured in seconds double time = (Environment.TickCount - tickStart) / 1000.0;
              // 3 seconds per cycle list.Add( time, Math.Sin( 2.0 * Math.PI * time / 3.0 ) ); 79         // Keep the X scale at a rolling 30 second interval, with one 80         // major step between the max X value and the end of the axis Scale xScale = zedGraphControl1.GraphPane.XAxis.Scale;
    if ( time > xScale.Max - xScale.MajorStep ) ...{ xScale.Max = time + xScale.MajorStep; xScale.Min = xScale.Max - 30.0; }
              // Make sure the Y axis is rescaled to accommodate actual data 81         //第三步:调用ZedGraphControl.AxisChange()方法更新X和Y轴的范围 zedGraphControl1.AxisChange(); // Force a redraw 82         //第四步:调用Form.Invalidate()方法更新图表 zedGraphControl1.Invalidate(); 83     } 84     

          private void Form1_Resize( object sender, EventArgs e ) 85 86     {
            SetSize();
          }
    87     // Set the size and location of the ZedGraphControl 88     
      
          private void SetSize() ... 89     { 90       // Control is always 10 pixels inset from the client rectangle of the form Rectangle formRect = this.ClientRectangle; 91        formRect.Inflate( -10, -10 ); 92        if(zedGraphControl1.Size != formRect.Size ) 93        { 94          zedGraphControl1.Location = formRect.Location; 95         zedGraphControl1.Size = formRect.Size; 96        } 97     }
       }
      }
    98

    另外几个例程:

    1、静态作图  

     1 using System;
     2 using System.Collections.Generic;
     3 using System.ComponentModel;
     4 using System.Data;
     5 using System.Drawing;
     6 using System.Linq;
     7 using System.Text;
     8 using System.Windows.Forms;
     9 using ZedGraph; //添加的
    10 namespace zedgraph
    11 {
    12     public partial class Form1 : Form
    13     {
    14         public Form1()
    15         {
    16             InitializeComponent();
    17             CreatePane(zedGraphControl1);
    18         }
    19         public void CreatePane(ZedGraphControl zgc)
    20         {
    21             GraphPane myPane = zgc.GraphPane;
    22             myPane.Title.Text = "My Mirror";
    23             myPane.XAxis.Title.Text = "Time,Second";
    24             myPane.YAxis.Title.Text = "Sample,Volts";
    25             PointPairList list = new PointPairList();
    26             Random ran = new Random();
    27             for (int i = 0; i < 100; i++)
    28             {
    29                 double x = (double)new XDate(DateTime.Now.AddSeconds(-(100 - i)));
    30                 double y = ran.NextDouble();
    31                 list.Add(x, y);
    32             }
    33             DateTime dt = DateTime.Now;
    34             // Generate a red curve with diamond
    35             // symbols, and "Porsche" in the legend
    36             LineItem myCurve = myPane.AddCurve("Porsche", list, Color.Red, SymbolType.Diamond);
    37             zgc.AxisChange();
    38             //this.zedGraphControl1.AxisChange();
    39             Refresh();
    40         }
    41     }
    42 }

    2、动态作图

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  • 原文地址:https://www.cnblogs.com/iMirror/p/3931509.html
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