一个波形图（如正弦）怎样在界面展示呢

[雨师88]

一个波形图（如正弦）怎样在界面展示呢

[SecretGarden]

参见：ZedGraph，一个基于 .NET 的科学绘图库

[flyerwing]

学习下,应该只能用图片展示了吧.

[LorenLiu]

以下代码作为参考

写一个自定义的Panel类，用于绘制坐标图

    public class CoordinatePanel : Panel
    {
        public CoordinatePanel()
        {
            m_CoordinateData = new List<Coordinate>();
            this.SetStyle(ControlStyles.ResizeRedraw, true);
        }

        public List<Coordinate> CoordinateData
        {
            get { return m_CoordinateData; }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            // Draw axis
            using (Pen pen = new Pen(Brushes.Black))
            {
                pen.EndCap = LineCap.ArrowAnchor;
                e.Graphics.DrawLine(
                    pen,
                    new Point(m_Margin, this.Height / 2),
                    new Point(this.Width - m_Margin, this.Height / 2)
                    );
                e.Graphics.DrawLine(
                    pen,
                    new Point(this.Width / 2, this.Height - m_Margin),
                    new Point(this.Width / 2, m_Margin)
                    );
            }


            // Draw data
            if (m_CoordinateData.Count == 0)
                return;

            Point[] pointArray = new Point[m_CoordinateData.Count];

            for (Int32 i = 0; i < m_CoordinateData.Count; i++)
            {
                Coordinate coordinate = m_CoordinateData[i];
                Point p = new Point(
                    Convert.ToInt32(coordinate.X * m_XScale + this.Width / 2), 
                    Convert.ToInt32(this.Height / 2 - coordinate.Y * m_YScale)
                    );

                pointArray[i] = p;
            }

            e.Graphics.DrawLines(Pens.Black, pointArray);
        }

        private List<Coordinate> m_CoordinateData;
        private Int32 m_Margin = 20;
        // set the y scale, the result will be extend on Y axis
        private Int32 m_YScale = 80;
        // set the x scale, the result will be extend on Y axis
        private Int32 m_XScale = 20;
    }

    public class Coordinate
    {
        public Coordinate(Double x, Double y)
        {
            m_X = x;
            m_Y = y;
        }

        public Double X
        {
            get { return m_X; }
            set { m_X = value; }
        }

        public Double Y
        {
            get { return m_Y; }
            set { m_Y = value; }
        }

        private Double m_X;
        private Double m_Y;
    }

测试代码如下

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            for (Double i = -Math.PI; i <= Math.PI; i += 0.01)
            {
                Coordinate coordinate = new Coordinate(i, Math.Sin(i));
                coordinatePanel1.CoordinateData.Add(coordinate);
            }
        }
    }

效果图