C#怎么绘制实时曲线图

这篇文章将为大家详细讲解有关C#怎么绘制实时曲线图，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

具体如下：

        //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;                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            //Rectangle YBDWMessRect = new Rectangle(SX, SY, MessageDotRadius * 2, MessageDotRadius * 2);//圆的大小            //YBDWCanvas.FillEllipse(SBTitle, YBDWMessRect);            //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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