C# GDI绘制波形图

直接上效果图如下

public partial class WaveChartUserCtrl : UserControl
    {
        Color axisColor = Color.FromArgb(69, 200, 255);//坐标颜色
        Color scaleColor = Color.FromArgb(129, 137, 156);//刻度颜色
        Font axisFont = new Font("宋体", 9, FontStyle.Bold);//坐标字体

        /// <summary>
        /// 画板宽度
        /// </summary>
        private float boardWidth;

        /// <summary>
        /// 画板高度
        /// </summary>
        private float boardHeight;

        /// <summary>
        /// 垂直（纵向）边距（画图区域距离左右两边长度）
        /// </summary>
        private float verticalMargin;

        /// <summary>
        /// 平行（横向）边距（画图区域距离左右两边长度）
        /// </summary>
        private float horizontalMargin;

        /// <summary>
        /// 水平间距像素
        /// </summary>
        private float horizontalBetween;

        /// <summary>
        /// 垂直间距像素
        /// </summary>
        private float verticalBetween;

        /// <summary>
        /// 图表区域宽度
        /// </summary>
        float chartWidth;

        /// <summary>
        /// 图表区域高度
        /// </summary>
        float charHeight;

        /// <summary>
        /// 画图区域起点
        /// </summary>
        PointF startPostion;

        /// <summary>
        /// 画图区域终点
        /// </summary>
        PointF endPostion;

        /// <summary>
        /// 左边Y轴每个间隔值
        /// </summary>
        private int leftIntervalValueY;
        /// <summary>
        /// 右边Y抽每个间隔值
        /// </summary>
        private int rightIntervalValueY;
        /// <summary>
        /// X轴每个间隔值
        /// </summary>
        //private int intervalValueX;
        /// <summary>
        /// X轴刻度线数量
        /// </summary>
        private int xScaleCount = 20;
        /// <summary>
        /// X轴刻度线数量
        /// </summary>
        public int XscaleCount
        {
            get
            {
                return xScaleCount;
            }
            set
            {
                xScaleCount = value;
            }
        }

        /// <summary>
        /// Y轴刻度线数量
        /// </summary>
        private int yScaleCount = 8;
        /// <summary>
        /// Y轴刻度线数量
        /// </summary>
        public int YscaleCount
        {
            get
            {
                return yScaleCount;
            }
        }

        private float leftmaxValue = 300;
        [Category("wyl")]
        [Description("左边坐标最大值")]
        public float LeftMaxValue
        {
            get
            {
                return leftmaxValue;
            }
            set
            {
                if (value <= LeftMinValue)
                {
                    MessageBox.Show("最大值不能低于最小值！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    //maxValue = 300;
                }
                else
                {
                    leftmaxValue = value;
                }
            }
        }
        private float leftminValue = 0;

        /// <summary>
        /// 仪表盘显示的最小值
        /// </summary>
        [Category("wyl")]
        [Description("左边坐标最小值")]
        public float LeftMinValue
        {
            get
            {
                return leftminValue;
            }
            set
            {
                if (value >= LeftMaxValue)
                {
                    MessageBox.Show("最小值不能超过最大值！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    //minValue = 0;
                }
                else
                {
                    leftminValue = value;
                }
            }

        }

        private float rightmaxValue = 100;
        [Category("wyl")]
        [Description("右边坐标最大值")]
        public float RightMaxValue
        {
            get
            {
                return rightmaxValue;
            }
            set
            {
                if (value <= RightMinValue)
                {
                    MessageBox.Show("最大值不能低于最小值！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                }
                else
                {
                    rightmaxValue = value;
                }
            }
        }
        private float rightminValue = 0;

        /// <summary>
        /// 仪表盘显示的最小值
        /// </summary>
        [Category("wyl")]
        [Description("右边坐标最小值")]
        public float RightMinValue
        {
            get
            {
                return rightminValue;
            }
            set
            {
                if (value >= RightMaxValue)
                {
                    MessageBox.Show("最小值不能超过最大值！", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                }
                else
                {
                    rightminValue = value;
                    //InitCanvas();
                }
            }

        }

        private List<Color> lineColor = new List<Color> { Color.Red, Color.FromArgb(0, 192, 0) };
        [Category("wyl")]
        [Description("线条颜色")]
        public List<Color> LineColor
        {
            get
            {
                return lineColor;
            }
            set
            {
                if (value != null && value.Count > 1)
                {
                    lineColor = value;
                }

            }
        }

        /// <summary>
        /// 显示文字
        /// </summary>
        string titlText1 = "";
        /// <summary>
        /// 显示文字
        /// </summary>
        [Category("wyl")]
        [Description("标题1")]
        public string TitlText1
        {
            get
            {
                return titlText1;
            }
            set
            {
                titlText1 = value;
            }
        }
        /// <summary>
        /// 显示文字
        /// </summary>
        string titlText2 = "";
        /// <summary>
        /// 显示文字
        /// </summary>
        [Category("wyl")]
        [Description("标题2")]
        public string TitlText2
        {
            get
            {
                return titlText2;
            }
            set
            {
                titlText2 = value;
            }
        }

        /// <summary>
        /// 数据源1
        /// </summary>
        private Series SeriesData1 = new Series();
        /// <summary>
        /// 数据源2
        /// </summary>
        private Series SeriesData2 = new Series();

        /// <summary>
        /// 真实画布宽度为画板的80% ，其余部分预留。
        /// </summary>
        private float canvasWidth;

        /// <summary>
        /// 最大X抽坐标为24H，最后记录一分钟记录一次
        /// </summary>
        private int MaxXScaleCount = 720;//24 * 60 / 2;//2秒通讯一次，最大每一分钟记录一次

        //private List<float> dataLst1 = new List<float>();
        //private List<float> dataLst2 = new List<float>();

        public DateTime startTime = DateTime.Now;

        public void InitCanvas()
        {
            boardWidth = this.ClientSize.Width;
            boardHeight = this.ClientSize.Height;
            horizontalMargin = 40;
            verticalMargin = 40;
            chartWidth = boardWidth - 2 * horizontalMargin;//画图区域宽度
            charHeight = boardHeight - 2 * verticalMargin; //画图区域高度,axisY 避免与X轴重合
            canvasWidth = chartWidth * 0.86F;//实际画布为画板的80%
            startPostion = new PointF(horizontalMargin, verticalMargin);
            endPostion = new PointF(boardWidth - horizontalMargin, boardHeight - verticalMargin);

            //SeriesData1.LineColor = Color.Red;
            //SeriesData2.LineColor = Color.FromArgb(0, 192, 0);

        }

        public WaveChartUserCtrl()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer
                | ControlStyles.AllPaintingInWmPaint
                | ControlStyles.DoubleBuffer, true);
            InitCanvas();

        }

        /// <summary>
        /// 画图
        /// </summary>
        /// <param name="gp"></param>
        private void Drawing(Graphics gs)
        {
            System.Diagnostics.Stopwatch runstopwatch = new System.Diagnostics.Stopwatch();
            runstopwatch.Start();
            if (SeriesData1.Datas.Count > 20)
            {
                XscaleCount = SeriesData1.Datas.Count;
            }
            horizontalBetween = canvasWidth / XscaleCount;
            verticalBetween = charHeight / YscaleCount;
            //intervalValueX = 1;//
            leftIntervalValueY = (int)(LeftMaxValue - LeftMinValue) / YscaleCount;
            rightIntervalValueY = (int)(RightMaxValue - RightMinValue) / YscaleCount;

            try
            {
                StringFormat strFmt = new System.Drawing.StringFormat();
                strFmt.Alignment = StringAlignment.Center; //文本水平居中
                strFmt.LineAlignment = StringAlignment.Center; //文本垂直居中
                Pen axisPen = new Pen(scaleColor, 1.0F);//坐标文字
                Bitmap bit = new Bitmap((int)boardWidth, (int)boardHeight);
                Graphics g = Graphics.FromImage(bit);
                //g.DrawString(TitlText, new Font("宋体", 9, FontStyle.Bold), new SolidBrush(SeriesData1.LineColor), 5, 10);
                float tempEndPointY = endPostion.Y;
                //Y轴格
                for (int i = 0; i <= YscaleCount; i++)
                {
                    float y = tempEndPointY - i * verticalBetween;
                    g.DrawLine(axisPen, startPostion.X, y, endPostion.X, y);

                    string leftText = (LeftMinValue + (i * leftIntervalValueY)).ToString();
                    SizeF sf = g.MeasureString(leftText, axisFont);
                    RectangleF rf = new RectangleF(startPostion.X - 30, y - sf.Height / 2, 30, sf.Height);
                    g.DrawString(leftText, axisFont, new SolidBrush(LineColor[0]), rf, strFmt);

                    string rightText = (RightMinValue + (i * rightIntervalValueY)).ToString();
                    sf = g.MeasureString(rightText, axisFont);
                    RectangleF rf1 = new RectangleF(endPostion.X + 5, y - sf.Height / 2, 30, sf.Height);
                    g.DrawString(rightText, axisFont, new SolidBrush(LineColor[1]), rf1, strFmt);

                }

                //画曲线
                if (SeriesData1 != null)
                {
                    strFmt.Alignment = StringAlignment.Near; //
                    RectangleF rf = new RectangleF(0, 0, 70, 30);
                    g.DrawString(TitlText1, new Font("宋体", 10, FontStyle.Bold), new SolidBrush(LineColor[0]), rf, strFmt);
                    //计算0值的坐标
                    int tempv = (int)((Math.Abs(LeftMinValue) - 0) / leftIntervalValueY);//得到0到最小值的间隔距离；
                    float zeroY = tempEndPointY - tempv * verticalBetween;//值为0点Y抽坐标；
                    if (SeriesData1.Datas.Count > 1)
                    {
                        int dataIndex = 0;
                        PointF[] arrDataPoint = new PointF[SeriesData2.Datas.Count];
                        int index = 0;
                        foreach (PointF pf in SeriesData1.Datas)
                        {
                            PointF p = new PointF();
                            p.X = startPostion.X + horizontalBetween * index;
                            p.Y = zeroY - verticalBetween * pf.Y / leftIntervalValueY;
                            arrDataPoint[dataIndex++] = p;
                            index++;
                        }
                        g.DrawCurve(new Pen(new SolidBrush(LineColor[0]), 2F), arrDataPoint);
                        PointF[] AreaPf = new PointF[arrDataPoint.Length + 2];
                        int AreaIndxe = 0;
                        AreaPf[AreaIndxe++] = new PointF(startPostion.X, zeroY);
                        foreach (PointF p in arrDataPoint)
                        {
                            AreaPf[AreaIndxe++] = p;
                        }
                        AreaPf[AreaIndxe++] = new PointF(arrDataPoint[arrDataPoint.Length - 1].X, zeroY);
                        g.FillPolygon(new SolidBrush(Color.FromArgb(50, LineColor[0])), AreaPf);
                        //g.FillClosedCurve(new SolidBrush(Color.FromArgb(50, SeriesData1.LineColor)), AreaPf);
                        //g.DrawEllipse(new Pen(Brushes.Red), startPostion.X, zeroY, 10, 10);
                    }
                }
                if (SeriesData2 != null)
                {
                    strFmt.Alignment = StringAlignment.Far; //
                    RectangleF rf = new RectangleF(boardWidth - 70, 0, 70, 30);
                    g.DrawString(TitlText2, new Font("宋体", 10, FontStyle.Bold), new SolidBrush(LineColor[1]), rf, strFmt);
                    //计算0值的坐标
                    int tempv = (int)((Math.Abs(RightMinValue) - 0) / rightIntervalValueY);//得到0到最小值的间隔距离；
                    float zeroY = tempEndPointY - tempv * verticalBetween;//值为0点Y抽坐标；
                    if (SeriesData2.Datas.Count > 1)
                    {
                        int dataIndex = 0;
                        PointF[] arrDataPoint = new PointF[SeriesData2.Datas.Count];
                        int index = 0;
                        foreach (PointF pf in SeriesData2.Datas)
                        {
                            PointF p = new PointF();
                            p.X = startPostion.X + horizontalBetween * index;
                            p.Y = zeroY - verticalBetween * pf.Y / rightIntervalValueY;
                            arrDataPoint[dataIndex++] = p;
                            index++;
                        }
                        g.DrawCurve(new Pen(new SolidBrush(LineColor[1]), 2F), arrDataPoint);
                        PointF[] AreaPf = new PointF[arrDataPoint.Length + 2];
                        int AreaIndxe = 0;
                        AreaPf[AreaIndxe++] = new PointF(startPostion.X, zeroY);
                        foreach (PointF p in arrDataPoint)
                        {
                            AreaPf[AreaIndxe++] = p;
                        }
                        AreaPf[AreaIndxe++] = new PointF(arrDataPoint[SeriesData2.Datas.Count - 1].X, zeroY);
                        g.FillPolygon(new SolidBrush(Color.FromArgb(50, LineColor[1])), AreaPf);
                    }
                }
                g.DrawString(startTime.ToString("HH:mm:ss"), new Font("宋体", 10, FontStyle.Regular), Brushes.White, 10, this.ClientSize.Height - 30);
                g.DrawString(DateTime.Now.ToString("HH:mm:ss"), new Font("宋体", 10, FontStyle.Regular), Brushes.White, this.ClientSize.Width - 80, this.ClientSize.Height - 30);
                g.DrawString("Time/H", new Font("宋体", 12, FontStyle.Regular), Brushes.Wheat, 0, this.ClientSize.Height - 15);
                gs.DrawImage(bit, 0, 0);
                g.Dispose();

                runstopwatch.Stop();
                TimeSpan timespan = runstopwatch.Elapsed;
                Console.WriteLine("Drawing:" + timespan.ToString());
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

        private void WaveChartUserCtrl_Resize(object sender, EventArgs e)
        {
            InitCanvas();
            this.Refresh();
        }

        private void WaveChartUserCtrl_Paint(object sender, PaintEventArgs e)
        {
            Drawing(e.Graphics);
        }

        public void AddSeriesData(List<float> dataLst1, List<float> dataLst2)
        {
            //System.Diagnostics.Stopwatch runstopwatch = new System.Diagnostics.Stopwatch();
            //runstopwatch.Start();

            //dataLst1.Add(y1);
            //dataLst2.Add(y2);
            //if (dataLst1.Count > 86400)
            //{
            //    dataLst1.RemoveAt(0);
            //}
            //if (dataLst2.Count > 86400)
            //{
            //    dataLst2.RemoveAt(0);
            //}

            int tempx = dataLst1.Count / MaxXScaleCount + 1;
            SeriesData1.Datas.Clear();
            for (int index = 0; index < dataLst1.Count; index++)
            {
                PointF p1 = new PointF(0, dataLst1[index]);
                if (index % tempx == 0 || index == dataLst1.Count)
                {
                    SeriesData1.Datas.Add(p1);
                }
            }
            SeriesData2.Datas.Clear();
            for (int index = 0; index < dataLst2.Count; index++)
            {
                PointF p2 = new PointF(0, dataLst2[index]);
                if (index % tempx == 0 || index == dataLst2.Count)
                {
                    SeriesData2.Datas.Add(p2);
                }
            }

            //runstopwatch.Stop();
            //TimeSpan timespan = runstopwatch.Elapsed;
            //Console.WriteLine(timespan.ToString());

            //this.Refresh();
        }

    }

    /// <summary>
    /// 数据系列管理
    /// </summary>
    public class Series
    {
        /// <summary>
        /// 标题
        /// </summary>
        public string HeadText = "title";

        Color lineColor = Color.Red;
        /// <summary>
        /// 当前画笔颜色
        /// </summary>
        public Color LineColor
        {
            get
            {
                return lineColor;
            }
            set
            {
                lineColor = value;
            }
        }

        public List<PointF> Datas = new List<PointF>();
    }