1.问题或需求描述:
使用 C# 实现动态图表,动态数据呈现
2.测试环境:
win10, vs2019, dotnet 4.5
3.解决方法或原理:
1>创建用户控件窗体
2>添加一个 System.Windows.Forms.DataVisualization.Charting.Chart 以呈现图表
2>添加一个 System.Windows.Forms.Timer 以构造随时间变化的随机数据(动态演示,数据刷新频率取决于此timer控件通知频率)
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Diagnostics; namespace DynamicChart { public partial class DChart : UserControl { static readonly int xPointNum = 25; Queue<int> dataQueue = new Queue<int>(); List<int> chartXList = new List<int>(); public DChart() { InitializeComponent(); this.Location = new Point(0, 0); dataQueue.Clear(); for (int i = 0; i < xPointNum; i++) { dataQueue.Enqueue(0); chartXList.Add(i+1); } chart1.Legends[0].Enabled = false; chart1.Series[0].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Spline; } private void DChart_Resize(object sender, EventArgs e) { chart1.Size = this.Size; } private void timerClock_Tick(object sender, EventArgs e) { if (DesignMode) return; int number = new Random().Next(0,50); if (dataQueue.Count >= xPointNum) dataQueue.Dequeue(); dataQueue.Enqueue(number); chart1.Series[0].Points.DataBindXY(chartXList, dataQueue); } private void DChart_Load(object sender, EventArgs e) { if (DesignMode) { timerClock.Enabled = false; Random random = new Random(); for (int i = 0; i < xPointNum; i++) { if (dataQueue.Count >= xPointNum) dataQueue.Dequeue(); dataQueue.Enqueue(random.Next(0, 100)); } chart1.Series[0].Points.DataBindXY(chartXList, dataQueue); } } } }
4.结果演示
5.备注
本文旨在演示动态图表的一种实现原理,不在于解决任何确切问题。
如读者测试实践中有困难,可向作者反馈,作者愿意提供适当援助。