折线图代码,CSharp代码库,德仔网

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【CSharp】折线图
作者:Dezai.CN / 发布于2013/1/16/ 481
/// <summary>
        /// 绘制折线图
        /// </summary>
        /// <param name="pnl">面板</param>
        /// <param name="lst">列表</param>
publice void DrawZXT(Panel pnl, List<LineTest> lst)
        {
            float maxv = 0;
            foreach (LineTest item in lst)
            {
                foreach (LineTest subitem in item.test1)
                {
                    if (subitem.Value > maxv)
                    {
                        maxv = subitem.Value;
                    }
                }
            }
            string maxstr = maxv.ToString("0").Substring(0, 1);
            float mv = (float)(int.Parse(maxstr) + 1);
            while (mv < maxv)
            {
                mv *= 10;
            }
            maxv = mv;
            Graphics g = pnl.CreateGraphics();
            g.FillRectangle(new SolidBrush(Color.FromArgb(255, pnl.ColorScheme.PanelBackground)), 1, 1, pnl.Width - 2, pnl.Height - 2);
            int xd = pnl.Width / 20;
            int yd = pnl.Height / 15;
            int[] ys = { yd * 13, yd * 12, yd * 11, yd * 10, yd * 9, yd * 8, yd * 7, yd * 6, yd * 5, yd * 4, yd * 3, yd * 2 };
            int[] xs = { xd * 3, xd * 4, xd * 5, xd * 6, xd * 7, xd * 8, xd * 9, xd * 10, xd * 11, xd * 12, xd * 13, xd * 14, xd * 15, xd * 16 };
            g.SmoothingMode = SmoothingMode.AntiAlias;
            Rectangle er = new Rectangle(0, 0, pnl.Width, pnl.Height);
            Point lbPoint = new Point(xd * 17, yd * 2 + 6);
            Point lePoint = new Point(xd * 18 - 8, yd * 2 + 6);
            Point tPoint = new Point(xd * 18, yd * 2);
            //
            Random rand = new Random();
            foreach (LineTest item in lst)
            {
                item.color = Color.FromArgb(rand.Next());
                g.DrawLine(new Pen(item.color, 3), lbPoint, lePoint);
                g.FillEllipse(new SolidBrush(Color.FromArgb(255, item.color)), lePoint.X - 3, lePoint.Y - 3, 6, 6);
                g.DrawString(item.LblYear.ToString("0000") + "年", new Font("宋体", 10), Brushes.Black, tPoint);
                lbPoint.Y += 16;
                lePoint.Y += 16;
                tPoint.Y += 16;
            }
            g.DrawLine(new Pen(Color.Gray, 3), new Point(xs[0], ys[0]), new Point(xs[0], ys[ys.Length - 1]));
            g.DrawLine(new Pen(Color.Gray, 3), new Point(xs[0], ys[ys.Length - 1]), new Point(xs[0] - 5, ys[ys.Length - 1] + 5));
            g.DrawLine(new Pen(Color.Gray, 3), new Point(xs[0], ys[ys.Length - 1]), new Point(xs[0] + 5, ys[ys.Length - 1] + 5));
            g.DrawLine(new Pen(Color.Gray, 3), new Point(xs[0], ys[0]), new Point(xs[0] - yd, ys[0] + yd));
            for (int i = 1; i < xs.Length - 1; i++)
            {
                g.DrawLine(new Pen(Color.LightGray, 1), new Point(xs[i], ys[0]), new Point(xs[i], ys[ys.Length - 1]));
                g.DrawString(string.Format("{0}月", i), new Font("宋体", 10), Brushes.Black, new Point(xs[i] - 12, ys[0] + 8));
            }
            g.DrawLine(new Pen(Color.Gray, 3), new Point(xs[0], ys[0]), new Point(xs[xs.Length - 1], ys[0]));
            g.DrawLine(new Pen(Color.Gray, 3), new Point(xs[xs.Length - 1], ys[0]), new Point(xs[xs.Length - 1] - 5, ys[0] + 5));
            g.DrawLine(new Pen(Color.Gray, 3), new Point(xs[xs.Length - 1], ys[0]), new Point(xs[xs.Length - 1] - 5, ys[0] - 5));
            for (int j = 1; j < ys.Length - 1; j++)
            {
                g.DrawLine(new Pen(Color.LightGray, 1), new Point(xs[0], ys[j]), new Point(xs[xs.Length - 1], ys[j]));
                string s = string.Format("{0:N}", maxv / 10 * j);
                g.DrawString(s, new Font("宋体", 10), Brushes.Black, new Point(xs[0] - 10 - s.Length * 7, ys[j] - 8));
            }
            for (int i = 0; i < lst.Count; i++)
            {
                for (int j = 0; j < lst[i].test1.Count; j++)
                {
                    int yv = (int)((lst[i].test1[j].Value / maxv) * (ys[0] - ys[ys.Length - 2]));
                    Point ap = new Point(xs[lst[i].test1[j].lblMonth], ys[0] - yv);
                    Point bp;
                    if (j == lst[i].test1.Count - 1)
                    {
                        bp = new Point(xs[0], ys[0]);
                    }
                    else
                    {
                        int yve = (int)((lst[i].test1[j + 1].Value / maxv) * (ys[0] - ys[ys.Length - 2]));
                        bp = new Point(xs[lst[i].test1[j].lblMonth - 1], ys[0] - yve);
                    }
                    g.DrawLine(new Pen(lst[i].color, 3), ap, bp);
                    g.FillEllipse(new SolidBrush(Color.FromArgb(255, lst[i].color)), ap.X-3,ap.Y-3,6,6);
                    Point tP = new Point();
                    string sv = lst[i].test1[j].Value.ToString("0.00");
                    tP.X = ap.X-sv.Length/2 *7;
                    tP.Y = ap.Y-16;
                    g.DrawString(sv, new Font("宋体", 10), Brushes.Black, tP);
                }
            }
        }
        /// <summary>
        /// 折线图数据
        /// </summary>
    public class LineTest
    {
        public LineTest(int y, int m, float v)
        {
            lblYear = y;
            lblMonth = m;
            Value = v;
        }
        public int lblYear { get; set; }
        public int lblMonth { get; set; }
        public float Value { get; set; }
        public Color color { get; set; }
        public List<LineTest> test1 = new List<LineTest>();
    }
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