C#波形图控件制作示例程序

namespace High_Tech_Watch
{
    public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
        }

        int[] oldLine;
        int SIZE = 15; //方格的大小
        Pen LINEPEN = new Pen(Color.FromArgb(3,64, 129), 1); //背景线条颜色
        Pen FORELINEPEN = new Pen(Color.LightBlue);  //前景线条颜色
        private void UserControl1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            int Bvalue;
            Bvalue = Value;
            if (shake != 0)
            {
                Random ro = new Random();
                int r = ro.Next(0, shake);
                Value += (ro.Next(-shake, 0) / 2) + r/2;
                if (Value>100)
                {
                    Value = 100;
                }
                if (Value < 0)
                {
                    Value = 0;
                }
            }
            int h = (int)(this.Size.Height / SIZE);
            int w = (int)(this.Size.Width / SIZE )+ 1;//这里加1保证了滚动时最右侧垂直线及时出现
            for (; h >= 0;h-- )
            {
                g.DrawLine(LINEPEN, new Point(0, h * SIZE), new Point(this.Size.Width, h * SIZE));
            }
            for (; w>=0;w-- )
            {
                g.DrawLine(LINEPEN, new Point((w * SIZE) - limits, 0), new Point((w * SIZE) - limits, this.Size.Height));
            }
            for (int i = oldLine.Length - 1,j = 0;i >j ;j++ )
            {
                g.DrawLine(FORELINEPEN, new Point(j,(this.Height - (int)(((float)oldLine[j] / (float)100) * (float)this.Height) ) -1),
                    new Point(j + 1, (this.Height - (int)(((float)oldLine[j+1] / (float)100) * (float)this.Height))-1) );
            }
            for (int i = oldLine.Length - 1, j = 0; i > j; j++)
            {
                oldLine[j] = oldLine[j + 1];
            }
            oldLine[oldLine.Length - 1] = Value;
            pintLightPoint(e);
            Value = Bvalue;
        }

        private void pintLightPoint(PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.DrawImage(global::High_Tech_Watch.Resource1.未标题_2,new Rectangle(new Point(this.Width - 50,this.Height - (int)(((float)lightPointValue / (float)100) * (float)this.Height ) - 10),new Size(20,20)));

        }

        int lightPointValue = 50;
        int limits = 0;//滚动就靠他了，是一个范围
        private void timer1_Tick(object sender, EventArgs e)
        {
            limits++;
            if (limits >= SIZE)
            {
                limits = 0;
            }
            this.Invalidate();
        }

        private void UserControl1_Load(object sender, EventArgs e)
        {

            oldLine = new int[this.Width - 40];

        }

        int shake = 0;
        [DefaultValue(0),Description("抖动率，值控件输入的值自动抖动（禁用是为0）"),Category("属性值")]
        public int Shake
        {
            get{return shake;}
            set{shake = value;}
        }
        [DefaultValue(0),Description("当前数值"),Category("属性值")]
        public int Value
        {
            get { return lightPointValue; }
            set { lightPointValue = value; }
        }
        [Description("当前数值"), Category("属性值")]
        public Pen LinePen
        {
            get { return LINEPEN; }
            set
            {
                LINEPEN = value;
                this.Invalidate();
            }
        }

        private void UserControl1_Resize(object sender, EventArgs e)
        {

            if ((this.Width - 40) > oldLine.Length)
            {
                 int[] newArry = new int[this.Width - 40];
                oldLine.CopyTo(newArry, newArry.Length - oldLine.Length);
                oldLine = new int[this.Width - 40];
                oldLine = newArry;
            }
            if ((this.Width - 40) < oldLine.Length)
            {
                int[] newArry = new int[this.Width - 40];
                for (int i = newArry.Length - 1,j = oldLine.Length - 1; i >=0 ;i--,j-- )
                {
                   newArry[i] = oldLine[j];
                }
                oldLine = new int[this.Width - 40];
                oldLine = newArry;
            }

        }
    }
}