ZedGraph实时曲线实例

2010-10-17 11:23:58| 分类： ASP.NET |举报|字号 订阅
public partial class FrmMain : Form
{
// 起始时间以毫秒为单位
int tickStart = 0;

public FrmMain()
{
InitializeComponent();
this.timeDraw.Tick += new EventHandler(timeDraw_Tick);
}

private void FrmMain_Load(object sender, EventArgs e)
{
//获取引用
GraphPane myPane = zedGraphControl1.GraphPane;
//设置标题
myPane.Title.Text = “实时曲线”;
//设置X轴说明文字
myPane.XAxis.Title.Text = “时间”;
//设置Y轴说明文字
myPane.YAxis.Title.Text = “温度”;

//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);

//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(“温度”, list, Color.Blue, SymbolType.None);

timeDraw.Interval = 50; //设置timer控件的间隔为50毫秒
timeDraw.Enabled = true; //timer可用
timeDraw.Start(); //开始

myPane.XAxis.Scale.Min = 0; //X轴最小值0
myPane.XAxis.Scale.Max = 30; //X轴最大30
myPane.XAxis.Scale.MinorStep = 1;//X轴小步长1,也就是小间隔
myPane.XAxis.Scale.MajorStep = 5;//X轴大步长为5，也就是显示文字的大间隔

//改变轴的刻度
zedGraphControl1.AxisChange();

//保存开始时间
tickStart = Environment.TickCount;
}

private void timeDraw_Tick(object sender, EventArgs e)
{
//确保CurveList不为空
if (zedGraphControl1.GraphPane.CurveList.Count <= 0)
{
return;
}

//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;
}

//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 (list == null)
{
return;
}

// 时间用秒表示
double time = (Environment.TickCount – tickStart) / 1000.0;
// 3秒循环
list.Add(time, Math.Sin(2.0 * Math.PI * time / 3.0));
Console.WriteLine(time.ToString());

Scale xScale = zedGraphControl1.GraphPane.XAxis.Scale;
if (time > xScale.Max – xScale.MajorStep)
{
xScale.Max = time + xScale.MajorStep;
xScale.Min = xScale.Max – 30.0;
}

//第三步:调用ZedGraphControl.AxisChange()方法更新X和Y轴的范围
zedGraphControl1.AxisChange();

//第四步:调用Form.Invalidate()方法更新图表
zedGraphControl1.Invalidate();
}

private void Form1_Resize(object sender, EventArgs e)
{
SetSize();
}

private void SetSize()
{
// 控制始终是以10像素插入矩形从客户端的形
Rectangle formRect = this.ClientRectangle;
formRect.Inflate(-10, -10);

if (zedGraphControl1.Size != formRect.Size)
{
zedGraphControl1.Location = formRect.Location;
zedGraphControl1.Size = formRect.Size;
}
}

}