今天下午在终端机器上的曲线显示本打算用控件，可控件折腾好长时间也没弄顺，还是自己写的好使，记录下来后面再改进。
//绘图部分的定义
Int32 Draw_Top;//绘画Y起点
Int32 Draw_Left;//绘画X起点
Int32 Draw_EdgeWidth;//X边缘宽度
Int32 Draw_EdgeHeight;//Y边缘高度
Int32 Draw_RangeWidth;//绘画范围宽度
Int32 Draw_RangeHeight;//绘画范围高度
Double[] XTDYData = new Double[21];
Int32 ICountDraw=0;

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Int32 IActualWidth, IActualHeight;
    Int32 Draw_AdjustX = 20;
    Int32 Draw_AdjustY = 20;
    Point StartPoint = new Point();
    Point EndPoint = new Point();
    Point ZeroPoint = new Point();
    Int32 IScalesY = 11;
    Int32 IScalesX = 21;
    Int32 IIncrementX;

    Pen pSpecial = new Pen(Color.Black,1);
    Pen pCommon = new Pen(Color.Black,2);
    Font FontTitle = new Font("微软雅黑", 12);//写标题的字体
    Font FontText = new Font("微软雅黑", 9);//写正文的字体           
    SolidBrush SBTitle = new SolidBrush(Color.Red);
    SolidBrush SBText = new SolidBrush(Color.Black);

在数据接收的事件中进行曲线绘制：
//显示趋势图
ICountDraw = ICountDraw + 1;
if (ICountDraw ==21)
{
for (int i=1;i<21;i++)
{
XTDYData[i - 1] = XTDYData[i];
}
XTDYData[20]= YBDWDealWithData.TYNDianYa.dValue;
ICountDraw = 20;
}
else
{
XTDYData[ICountDraw] = YBDWDealWithData.TYNDianYa.dValue;
}
FuncDrawYBDW();
下面是基础函数：
public void FuncDrawYBDW() {
Bitmap bmp = new Bitmap(Draw_RangeWidth, Draw_RangeHeight);//定义画布的大小
Graphics graphics = Graphics.FromImage(bmp);
FuncDrawBasePic(ref graphics);
FuncDrawDynamicPic(ref graphics);
Graphics g = Graphics.FromHwnd(pictureBox1.Handle);
g.DrawImage(bmp, new Point(0, 0));//在内存中画完后显示在pictureBox1上，避免闪烁
}

public void FuncDrawBasePic(ref Graphics YBDWCanvas)
    {
        //绘制基础
        //画一个方框
        YBDWCanvas.FillRectangle(Brushes.WhiteSmoke, Draw_Top, Draw_Left, Draw_RangeWidth, Draw_RangeHeight);
        //画坐标轴X
        pCommon.Width = 2;
        pCommon.Color = Color.Black;
        StartPoint.X = Draw_Left + Draw_AdjustX;
        StartPoint.Y = Draw_Top + Draw_RangeHeight - Draw_AdjustY * 2;
        EndPoint.X = Draw_Left + Draw_RangeWidth - Draw_AdjustX * 2;
        EndPoint.Y = Draw_Top + Draw_RangeHeight - Draw_AdjustY * 2;
        YBDWCanvas.DrawLine(pCommon, StartPoint, EndPoint);
        IActualWidth = EndPoint.X - StartPoint.X;
        YBDWCanvas.DrawString("X", FontText, SBText, EndPoint.X, EndPoint.Y - 8);
        //画箭头
        StartPoint.X = EndPoint.X - 8;
        StartPoint.Y = EndPoint.Y - 4;
        YBDWCanvas.DrawLine(pCommon, StartPoint, EndPoint);
        StartPoint.X = EndPoint.X - 8;
        StartPoint.Y = EndPoint.Y + 4;
        YBDWCanvas.DrawLine(pCommon, StartPoint, EndPoint);
        //画坐标轴Y
        pCommon.Width = 2;
        pCommon.Color = Color.Black;
        StartPoint.X = Draw_Left + Draw_AdjustX;
        StartPoint.Y = Draw_Top + Draw_AdjustY;
        EndPoint.X = Draw_Left + Draw_AdjustX;
        EndPoint.Y = Draw_Top + Draw_RangeHeight - Draw_AdjustY * 2;
        YBDWCanvas.DrawLine(pCommon, StartPoint, EndPoint);
        IActualHeight = EndPoint.Y - StartPoint.Y;
        ZeroPoint = EndPoint;
        //画画箭头
        EndPoint.X = StartPoint.X - 4;
        EndPoint.Y = StartPoint.Y + 8;
        YBDWCanvas.DrawLine(pCommon, StartPoint, EndPoint);
        EndPoint.X = StartPoint.X + 4;
        EndPoint.Y = StartPoint.Y + 8;
        YBDWCanvas.DrawLine(pCommon, StartPoint, EndPoint);
        YBDWCanvas.DrawString("Y", FontText, SBText, EndPoint.X, EndPoint.Y - 8);
        //画X刻度
        pSpecial.Width = 1;
        pSpecial.DashStyle = DashStyle.Custom;
        pSpecial.DashPattern = new float[] { 1f, 1f };
        IIncrementX = IActualWidth / IScalesX;
        for (int i = 1; i < IScalesX; i = i + 1)
        {
            StartPoint.X = ZeroPoint.X + IIncrementX * i;
            StartPoint.Y = ZeroPoint.Y - 2;
            EndPoint.X = StartPoint.X;
            EndPoint.Y = StartPoint.Y - IActualHeight - 2;
            YBDWCanvas.DrawLine(pSpecial, StartPoint, EndPoint);
            //写标识字
            if (i % 2 == 0)
            {
                YBDWCanvas.DrawString(i.ToString(), FontText, SBText, StartPoint.X - 6, StartPoint.Y + 4);
            }
        }

        //画Y刻度
        Int32 IIncrementY = IActualHeight / IScalesY;
        for (int i = 1; i < IScalesY; i = i + 1)
        {
            StartPoint.X = ZeroPoint.X;
            StartPoint.Y = ZeroPoint.Y - IIncrementY * i;
            EndPoint.X = StartPoint.X + IActualWidth;
            EndPoint.Y = StartPoint.Y;
            YBDWCanvas.DrawLine(pSpecial, StartPoint, EndPoint);
            //写标识字
            if (i % 2 == 0)
            {
                YBDWCanvas.DrawString((i - 1).ToString(), FontText, SBText, StartPoint.X - 12, StartPoint.Y + 4);
            }
        }
        //写标题
        //Rectangle YBDWMe***ect = new Rectangle(SX, SY, MessageDotRadius * 2, MessageDotRadius * 2);//圆的大小
        //YBDWCanvas.FillEllipse(SBTitle, YBDWMe***ect);
        //画连接线
        YBDWCanvas.DrawString(SDrawTitle, FontTitle, SBTitle, 100,30);

    }

    public void FuncDrawDynamicPic(ref Graphics YBDWCanvas)
        {
        //准备实际画线的数据
        Point[] XTDYPoints =new Point[21];//系统电压数据
        for (int i = 0; i < IScalesX; i = i + 1)
        {
                XTDYPoints[i].X = ZeroPoint.X + IIncrementX * i;
                XTDYPoints[i].Y = ZeroPoint.Y - (int)((XTDYData[i]/IActualHeight)*6000);
        }
        pSpecial.Width = 3;
        pSpecial.Color = Color.Red;
        YBDWCanvas.DrawCurve(pSpecial, XTDYPoints, 3.0F);
    }

实际效果图：

点选不同的文字进行相应的实时动态图的显示。

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标题名称：C#绘制实时曲线图-创新互联
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