模仿ArcGIS用Graphics重绘的直方图分级调节器

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.Carto;

namespace 专题图自动化系统
{
    public partial class ColorMap : Form
    {
        double max, min;
        AxMapControl axMapControl1;
        string FindField;
        public ColorMap(double _max,double _min,AxMapControl ax,string findField)
        {
            InitializeComponent();
            max = _max;
            min = _min;
            axMapControl1 = ax;
            FindField = findField;
        }
        IFeatureClass pFeatureClass;
        private void FindCity()
        {
            IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;
            if (pFeatureLayer != null)
                pFeatureClass = pFeatureLayer.FeatureClass;
            int[] index = new int[2];//name字段+查询依据字段
            for (int i = 0; i < index.Length; i++)
            {
                if (i == 0)
                    index[i] = pFeatureClass.Fields.FindField("name");
                else
                    index[i] = pFeatureClass.Fields.FindField(FindField);
            }
            IFeatureCursor pFeatureCursor = pFeatureClass.Search(null,false);
            IFeature pFeature = pFeatureCursor.NextFeature();
            object [] value=new object[index.Length];
            while (pFeature != null)
            {
                for (int i = 0; i < index.Length; i++)
                {
                    value[i] = pFeature.get_Value(index[i]);
                    if (i == 1)
                    {
                        double  a = Convert.ToDouble(value[1].ToString());
                        switch (searchCity.Length)
                        {
                            case 2: N1.Add(value[0].ToString()); break;
                            case 3: if (a <= searchCity[1]) { N1.Add(value[0].ToString());}
                            else{N2.Add(value[0].ToString());}break;
                            case 4: if (a <= searchCity[1]) { N1.Add(value[0].ToString()); }
                                if (a > searchCity[1] && a <= searchCity[2]) { N2.Add(value[0].ToString()); }
                                if (a > searchCity[2]) { N3.Add(value[0].ToString()); }break;
                            case 5: if (a <= searchCity[1]) { N1.Add(value[0].ToString()); }
                                if (a > searchCity[1] && a <= searchCity[2]) { N2.Add(value[0].ToString()); }
                                if (a > searchCity[2]&&a<=searchCity[3]) { N3.Add(value[0].ToString()); }
                                if(a>searchCity[3]){N4.Add(value[0].ToString());}break;
                            case 6: if (a <= searchCity[1]) { N1.Add(value[0].ToString()); }
                                if (a > searchCity[1] && a <= searchCity[2]) { N2.Add(value[0].ToString()); }
                                if (a > searchCity[2] && a <= searchCity[3]) { N3.Add(value[0].ToString()); }
                                if (a > searchCity[3]&&a<=searchCity[4]) { N4.Add(value[0].ToString()); }
                                if(a>searchCity[4]){N5.Add(value[0].ToString());}break;
                        }
                    }
                    
                }
                pFeature = pFeatureCursor.NextFeature();
            }
        }
        List<string> N1 = new List<string>();
        List<string> N2 = new List<string>();
        List<string> N3 = new List<string>();
        List<string> N4 = new List<string>();
        List<string> N5 = new List<string>();
        private void DrawCity()
        {
            Bitmap bt = new Bitmap(panel3.Width,panel3.Height);
            Graphics g = Graphics.FromImage(bt);
            Pen pen = new Pen(Color.Black,1);
            string []n1=new string[6];
            if (N1 != null)
            {
                foreach (string a in N1)
                {
                    n1[1] += a + ",";
                }
            }
            if (N2 != null)
            {
                foreach (string a in N2)
                {
                    n1[2] += a + ",";
                }
            }
            if (N3 != null)
            {
                foreach (string a in N3)
                {
                    n1[3] += a + ",";
                }
            }
            if (N4 != null)
            {
                foreach (string a in N4)
                {
                    n1[4] += a + ",";
                }
            }
            if (N5 != null)
            {
                foreach (string a in N5)
                {
                    n1[5] += a + ",";
                }
            }
            for (int i = 1; i <= n; i++)
            {
                g.DrawString("第" + i + "级:" +n1[i], new Font("黑体", 10), new SolidBrush(Color.Black), new PointF(20, 25 * i));
            }
            panel3.BackgroundImage = bt;
        }
        private void DrawString()
        {
            Bitmap bt = new Bitmap(panel2.Width,panel2.Height);
            Graphics g = Graphics.FromImage(bt);
            Pen pen = new Pen(Color.Black,1);
            double fromValue = min;
            searchCity[0] = fromValue;
            double toValue;
            for (int i = 1; i <= n; i++)
            {
                if (i == index)
                    toValue = min + (x2 - temp[1]) * k / flag;
                else
                    toValue=min + i * k;
                searchCity[i] = toValue;
                g.DrawString("第"+i+"级:"+fromValue+"万到"+toValue+"万",new Font("黑体",10),new SolidBrush(Color.Black),new PointF(20,25*i));
                fromValue=toValue;
            }
            panel2.BackgroundImage = bt;
        }
        double k;
        private void DrawZft()
        {
            Bitmap bt = new Bitmap(panel1.Width,panel1.Height);
            Graphics g = Graphics.FromImage(bt);
            Pen pen = new Pen(Color.White,1);
            g.DrawLine(pen,new Point(30,0),new Point(30,panel1.Height-30));
            g.DrawLine(pen,new Point(30,panel1.Height-30),new Point(panel1.Width-4,panel1.Height-30));
            k = (max - min) / n;
            for (int i = 1; i <= n+1; i++)
            {
                if (i == index)
                {
                    g.DrawString((min + (x2-temp[1]) * k/flag).ToString(), new Font("宋体", 9), new SolidBrush(Color.White), new PointF(x2 - 2, panel1.Height-30));
                    g.DrawLine(pen, new PointF(x2, panel1.Height-30), new PointF(x2, 0));
                }
                else
                {
                    g.DrawString((min + (i-1) * k).ToString(), new Font("宋体", 9), new SolidBrush(Color.White), new PointF(temp[i] - 8, panel1.Height-30));
                    g.DrawLine(pen, new PointF(temp[i], panel1.Height-30), new PointF(temp[i], 0));
                }
            }
            panel1.BackgroundImage = bt;
        }
        int n=0;
        float[] temp;
        int flag;
        double []searchCity;
        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            n = int.Parse(comboBox1.SelectedItem.ToString());
            temp = new float[n + 2];
            searchCity=new double[n+1];
            flag = (panel1.Width - 4) / (n + 1);
            for (int i = 1; i <= n+1; i++)
            {
                temp[i] = flag * i;
            }
            if (N1 != null)
                N1.Clear();
            if (N2 != null)
                N2.Clear();
            if (N3 != null)
                N3.Clear();
            if (N4 != null)
                N4.Clear();
            if (N5 != null)
                N5.Clear();
            DrawZft();
            DrawString();
            FindCity();
            DrawCity();
        }
        int index=0;
        int x1, x2, x3;
        private void panel1_MouseDown(object sender, MouseEventArgs e)
        {
            x1 = e.X;
            for (int i = 1; i < temp.Length; i++)
            {
                if (Math.Abs(x1 - temp[i]) < 3)
                {
                    index = i;
                }
            }
        }

        private void panel1_MouseMove(object sender, MouseEventArgs e)
        {
            x2=e.X;
            if (index != 0)
            {
                if (N1 != null)
                    N1.Clear();
                if (N2 != null)
                    N2.Clear();
                if (N3 != null)
                    N3.Clear();
                if (N4 != null)
                    N4.Clear();
                if (N5 != null)
                    N5.Clear();
                DrawZft();
                DrawString();
                FindCity();
                DrawCity();
            }
        }

        private void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            x3 = e.X;
            temp[index] = x3;
            DrawZft();
            index = 0;
        }
    }
}