GDI+柱状图

在网上搜寻了一下柱状图的例子,看到这一篇http://www.cnblogs.com/ziyifly/archive/2008/09/24/1297841.html

修改一下后发出来,大家指正.

  1        /**//// <summary>
  2        /// 生成柱状图(有比较)
  3        /// </summary>
  4        public static Bitmap CreateZhuZhuangTu(IList<PReportParam> paraList, IList<PReportParam> paraList2, string name1, string name2)
  5        {
  6            int height = 500, width = 780;
  7            Bitmap image = new Bitmap(width, height);
  8            //创建Graphics类对象
  9            Graphics g = Graphics.FromImage(image);
 10            bool hasPara2 = false; //是否有比较参数
 11            if (paraList2 != null && paraList2.Count > 0)
 12            {
 13                hasPara2 = true;
 14            }
 15
 16            try
 17            {
 18                //清空图片背景色
 19                g.Clear(Color.White);
 20
 21                Font font = new Font("Arial", 10, FontStyle.Regular);
 22                Font font1 = new Font("宋体", 12, FontStyle.Bold);
 23
 24                LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.BlueViolet, 1.2f, true);
 25                g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);
 26                // Brush brush1 = new SolidBrush(Color.Blue);
 27                StringFormat sf = new StringFormat();
 28                sf.FormatFlags = StringFormatFlags.DirectionVertical;
 29
 30                g.DrawString("月收支分类统计柱状图", font1, brush, new PointF(20, 20), sf);
 31                //画图片的边框线
 32                g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 1, image.Height - 1);
 33
 34                Pen mypen = new Pen(brush, 1);
 35                Pen mypen1 = new Pen(Color.Blue, 2);
 36
 37                int counts = paraList.Count();//显示的项数
 38                int zx = 100;  //坐标轴原点x坐标
 39                int zy = 420;  //坐标轴原点y坐标
 40                int zwidth = 580;  //坐标轴宽
 41                int zheight = 400; //坐标轴高
 42
 43                decimal maxNum = 0.00m;
 44
 45                List<PReportParam> p1 = paraList.OrderBy<PReportParam, decimal>(tmp => tmp.Num).ToList<PReportParam>();
 46                decimal maxNum1 = p1[p1.Count - 1].Num;  //最大的一个数字
 47                if (hasPara2)
 48                {
 49                    List<PReportParam> p2 = paraList2.OrderBy<PReportParam, decimal>(tmp => tmp.Num).ToList<PReportParam>();
 50                    decimal maxNum2 = p2[p2.Count - 1].Num;
 51                    if (maxNum1 > maxNum2)
 52                    {
 53                        maxNum = maxNum1;
 54                    }
 55                    else
 56                    {
 57                        maxNum = maxNum2;
 58                    }
 59                }
 60                else
 61                {
 62                    maxNum = maxNum1;
 63                }
 64                decimal peNum = zheight / maxNum;  //每单位代表多少像素
 65
 66                //绘制线条
 67                //绘制竖向线条
 68                int x = zx;
 69                g.DrawLine(mypen1, zx, zy, zx, zy - zheight);
 70
 71                //绘制横向线条
 72                int y = zy;
 73                g.DrawLine(mypen1, zx, zy, zx + zwidth, zy);
 74
 75                Font font2 = new System.Drawing.Font("Arial", 8);
 76
 77                for (int i = 0; i < paraList.Count; i++)
 78                {
 79                    string sc = paraList[i].Color;
 80                    if (sc == null || sc == "")
 81                    {
 82                        sc = "ff000000";
 83                    }
 84                    int ca = 0, cr = 0, cg = 0, cb = 0;
 85                    ColorARGBToParam(sc, ref ca, ref cr, ref cg, ref cb);
 86                    SolidBrush sb = new SolidBrush(Color.FromArgb(ca, cr, cg, cb));
 87
 88                    //画柱状图
 89                    x = x + 40;
 90                    y = Convert.ToInt32(paraList[i].Num * peNum);
 91                    g.FillRectangle(sb, x, zy - y - 1, 18, y);
 92                    //写字
 93                    string num = DecimalTrim(paraList[i].Num);
 94                    g.DrawString(num, font2, Brushes.Black, x, zy - y - 15);
 95                    g.DrawString(paraList[i].Name, font2, Brushes.Black, x, zy + 1, sf);
 96
 97                    if (hasPara2)
 98                    {
 99                        //画竖线
100                        g.DrawLine(mypen, x + 18, zy - 1, x + 18, zy - zheight - 1);
101                        //画柱状图
102                        y = Convert.ToInt32(paraList2[i].Num * peNum);
103                        g.FillRectangle(sb, x + 19, zy - y - 1, 18, y);
104                        //写字
105                        num = DecimalTrim(paraList2[i].Num);
106                        g.DrawString(num, font2, Brushes.Black, x + 20, zy - y - 15);
107                    }
108                }
109
110                g.DrawString("左边:" + name1, font2, Brushes.Red, 20, 300, sf);
111                g.DrawString("右边:" + name2, font2, Brushes.Green, 40, 300, sf);
112            }
113            catch
114            { }
115
116            return image;
117        }