C# 绘制柱形图图形高度和Y轴不一致

头发凌乱 2013-07-29 01:55:47

private void CreateImage() {



           string[] month = new string[5] { "第一季度", "第二季度", "第三季度", "第四季度", "全年"};

          //  float[] d = new float[12] { 20,30,10,50,25,36,14,70,50.4F,28,31,10};

            Bitmap bMap = new Bitmap(700,700);

            Graphics gph = Graphics.FromImage(bMap);

            gph.Clear(Color.White);



            PointF cpt = new PointF(40, 420);

            //X轴三角形

            PointF[] xpt = new PointF[3] { new PointF(cpt.Y+8, cpt.Y), new PointF(cpt.Y, cpt.Y - 4), new PointF(cpt.Y, cpt.Y + 4) };

            //Y轴三角形

            PointF[] ypt = new PointF[3] { new PointF(cpt.X, cpt.X - 8), new PointF(cpt.X -4, cpt.X), new PointF(cpt.X + 4, cpt.X) };

            gph.DrawString("呼叫统计图", new Font("宋体", 14), Brushes.Black, new PointF(cpt.X + 60, cpt.X));

         

            //画X轴

            gph.DrawLine(Pens.Black, cpt.X, cpt.Y, cpt.Y, cpt.Y);

            gph.DrawPolygon(Pens.Black, xpt);

            gph.FillPolygon(new SolidBrush(Color.Black), xpt);

            gph.DrawString("月份",new Font("宋体",12),Brushes.Black,new PointF(cpt.Y+10,cpt.Y+10));

            //画Y轴

            gph.DrawLine(Pens.Black, cpt.X, cpt.Y, cpt.X, cpt.X);

            gph.DrawPolygon(Pens.Black, ypt);

            gph.FillPolygon(new SolidBrush(Color.Black), ypt);

            gph.DrawString("单位（万）", new Font("宋体", 12), Brushes.Black, new PointF(0,7));

      

            for (int i = 1; i <= 12;i++ )

            {

                //画Y轴刻度

                if(i<12){

                    gph.DrawString((i*25).ToString(),new Font("宋体",11),Brushes.Black,new PointF(15,cpt.Y-i*30-6));

                    gph.DrawLine(Pens.Black,cpt.X+3,cpt.Y-i*30,cpt.X,cpt.Y-i*30);

                }

                if(i<6){

                    gph.DrawString(month[i - 1].Substring(0, 1), new Font("宋体", 11), Brushes.Black, new PointF(cpt.X + i * 30 - 5, cpt.Y + 5));

                    gph.DrawString(month[i - 1].Substring(1, 1), new Font("宋体", 11), Brushes.Black, new PointF(cpt.X + i * 30 - 5, cpt.Y + 20));

                }

                

            }

    

       

                 int[] count=new int[5];

                 DBHelper.connection.Open();

                 SqlCommand cmd = new SqlCommand("select count(*) from History", DBHelper.connection);

                 int sum =(int)cmd.ExecuteScalar();

                 DBHelper.connection.Close();

                

                 try

                 {

                     for (int n = 1; n <= 10; n = n + 3)

                     {

                         DBHelper.connection.Open();

                         string sql = string.Format("select count(*) from History where month(time) between '" + n + "'and '" + (n + 2) + "'and datediff(year, time,getdate())=0");

                         SqlDataAdapter da = new SqlDataAdapter(sql, DBHelper.connection);

                         DataSet ds = new DataSet();

                         int num = da.Fill(ds, "Histrory");

                         count[n / 3] = (int)ds.Tables[0].Rows[0][0];

                         DBHelper.connection.Close();

                     }

                     count[4] = count[0] + count[1] + count[2] + count[3];



                       float x = cpt.X;

                       Font font2 = new System.Drawing.Font("Arial", 10, FontStyle.Bold);

                       Brush brush1 = new SolidBrush(Color.Red);



                     for(int m=0;m<5;m++){



                          x = x + 29;

                          gph.FillRectangle(brush1, x, 420 - count[m], 20, count[m] );

                          gph.DrawString(count[m].ToString(), font2, Brushes.Green, x, 420 - count[m]-15);

                     }

                     pictureBox1.Image = new Bitmap(bMap);

                 }

                 catch (Exception)

                 {

                 

                     throw;

                 }

        }