ZedGraph控件能够显示动态或静态数据

ZedGraph控件能够显示动态或静态数据。 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. The code sample is for a form that implements a ZedGraphControl with a Timer event to show dynamically updated data. You can download the complete project from the links below: 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. Visual C# Code using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using ZedGraph; namespace DynamicData ...{ public partial class Form1 : Form ...{ // Starting time in milliseconds int tickStart = 0; public Form1() ...{ InitializeComponent(); } private void Form1_Load( object sender, EventArgs e ) ...{ //获取引用 GraphPane myPane = zedGraphControl1.GraphPane; //设置标题 myPane.Title.Text = "Test of Dynamic Data Update with ZedGraph " + "(After 25 seconds the graph scrolls)"; //设置X轴说明文字 myPane.XAxis.Title.Text = "Time, Seconds"; //设置Y轴文字 myPane.YAxis.Title.Text = "Sample Potential, Volts"; // Save 1200 points. At 50 ms sample rate, this is one minute // The RollingPointPairList is an efficient storage class that always // keeps a rolling set of point data without needing to shift any data values //设置1200个点，假设每50毫秒更新一次，刚好检测1分钟 //一旦构造后将不能更改这个值 RollingPointPairList list = new RollingPointPairList( 1200 ); // Initially, a curve is added with no data points (list is empty) // Color is blue, and there will be no symbols //开始，增加的线是没有数据点的(也就是list为空) //增加一条名称:Voltage，颜色Color.Bule，无符号，无数据的空线条 LineItem curve = myPane.AddCurve( "Voltage", list, Color.Blue, SymbolType.None ); // Sample at 50ms intervals //设置timer控件的间隔为50毫秒 timer1.Interval = 50; //timer可用 timer1.Enabled = true; //开始 timer1.Start(); // Just manually control the X axis range so it scrolls continuously // instead of discrete step-sized jumps //X轴最小值0 myPane.XAxis.Scale.Min = 0; //X轴最大30 myPane.XAxis.Scale.Max = 30; //X轴小步长1,也就是小间隔 myPane.XAxis.Scale.MinorStep = 1; //X轴大步长为5，也就是显示文字的大间隔 myPane.XAxis.Scale.MajorStep = 5; // Scale the axes //改变轴的刻度 zedGraphControl1.AxisChange(); // Save the beginning time for reference //保存开始时间 tickStart = Environment.TickCount; } private void timer1_Tick( object sender, EventArgs e ) ...{ // Make sure that the curvelist has at least one curve //确保CurveList不为空 if ( zedGraphControl1.GraphPane.CurveList.Count <= 0 ) return; // Get the first CurveItem in the graph //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; // Get the PointPairList //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 IPointListEdit list = curve.Points as IPointListEdit; // If this is null, it means the reference at curve.Points does not // support IPointListEdit, so we won't be able to modify it if ( list == null ) return; // 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 ) ); // Keep the X scale at a rolling 30 second interval, with one // 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 //第三步:调用ZedGraphControl.AxisChange()方法更新X和Y轴的范围 zedGraphControl1.AxisChange(); // Force a redraw //第四步:调用Form.Invalidate()方法更新图表 zedGraphControl1.Invalidate(); } private void Form1_Resize( object sender, EventArgs e ) ...{ SetSize(); } // Set the size and location of the ZedGraphControl private void SetSize() ...{ // Control is always 10 pixels inset from the client rectangle of the form Rectangle formRect = this.ClientRectangle; formRect.Inflate( -10, -10 ); if ( zedGraphControl1.Size != formRect.Size ) ...{ zedGraphControl1.Location = formRect.Location; zedGraphControl1.Size = formRect.Size; } } } }