PictureBox数据波动

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;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
//随机数
private static int iSeed = 8;
Random rd = new Random(iSeed);
//存放数据的数组最大值
private int sizeMax;
//存放y轴数据的数组链表
private List<int> DataL;
//存放在画布上的数据节点的数组
private Point[] pArrData;

public Form1()
{
InitializeComponent();
//初始化
sizeMax = pcbDisplay.Width / 2;
//数据数组
DataL = new List<int>();
pArrData = new Point[sizeMax + 1];
}

private void Form1_Load(object sender, EventArgs e)
{
timer1.Start();
}

private void timer1_Tick(object sender, EventArgs e)
{
DataL.Add(rd.Next(20,180));
//数据链表是否达到x轴最大容量的数组（动态曲线的来源）
if (DataL.Count == sizeMax + 2)
{
DataL.RemoveAt(0);//移除链表第一个
}

//判断数据链表是否为空
if (DataL.Count != 0)
{
pArrData = new Point[DataL.Count];
}

//生成新的节点
for (int i = 0; i < sizeMax + 1; i++)
{
if (i >= DataL.Count)
{
break;
}
pArrData[i] = new Point(i * 2, DataL[i]);
}
pcbDisplay.Refresh();

}

#region 绘制曲线

//定义画笔
private Pen greenPen = new Pen(Color.Green, 1);
private Pen redPen = new Pen(Color.Red, 1);
private Pen blackPen = new Pen(Color.Black, 1);
/// <summary>
/// 绘制曲线
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{

if (DataL.Count != 1)
{
e.Graphics.DrawCurve(greenPen, pArrData);
}
}

#endregion
}
}