c#制作图表（从数据库读取数据，制作柱状图，扇形图）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.IO;
using System.Drawing.Drawing2D;


namespace WindowsApplication30
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }

//柱状图
        private void button3_Click(object sender, EventArgs e)
        {
            this.Height = 600;
            this.Width = 500;
            pictureBox1.Height = 500;
            pictureBox1.Width=450;
            int[] a =new int[]{30,20,50,40,40,78,45,98,87,47,46,98 };
            int w=400;
            int h=450;
            Bitmap bmp = new Bitmap(w, h);
            Graphics g = Graphics.FromImage(bmp);
            g.Clear(Color.White);
            g.DrawRectangle(Pens.AliceBlue, 0, 0, 399, 399);
            string title = "2009销售情况统计表";
            Font f = new Font("黑体", 16);
            g.DrawString(title, f, Brushes.Blue, (w / 2 - g.MeasureString(title, f).Width / 2), 2);
            float v_width = w;
            float v_height=w-2-g.MeasureString(title,f).Height-10;
            float p_width = w / 25;
            float p_heigth = v_height / 150;
            float x = 0;
            float y = 0;
            double k = 0;
            Font f9 = new Font("宋体", 9);
            for (int i = 0; i < 12;i++ )
            {
                x = (i * 2 + 1) * p_width;
                y = w - p_heigth * a[i];
                g.FillRectangle(Brushes.Black, x, y, p_width, a[i] * p_heigth);
                k = i + 1;
                g.DrawString(k.ToString() + "月", f9, Brushes.Black, x, w + 2);
            
                g.DrawString(a[i].ToString(), f9, Brushes.Black, x-4,y - 2 - g.MeasureString(a[i].ToString(), f9).Width / 2-2);
            }
            MemoryStream ms = new MemoryStream();
            bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            Image img = Image.FromStream(ms);
            pictureBox1.Image = img;
            ms.Close();
        }
        //画扇形图
        private void button4_Click(object sender, EventArgs e)
        {
            List<int> mylist=new List<int>();
            mylist.Add(200);
            mylist.Add(100);
            mylist.Add(300);
            mylist.Add(350);

            int sum = 0;
            for (int i = 0; i < mylist.Count; i++)
            {
                sum += mylist[i];

            }
            float pangle = 360.0F/sum;
            Bitmap bmp = new Bitmap(500, 450);
            Graphics g = Graphics.FromImage(bmp);
            g.Clear(Color.White);
            g.SmoothingMode = SmoothingMode.AntiAlias;
            g.DrawRectangle(Pens.Blue, 0, 0, 449, 449);
            Font f16 = new Font("黑体", 16);
            g.DrawString("2009年季度销售情况统计表", f16, Brushes.Black, 225 - g.MeasureString("2009年季度销售情况统计表", f16).Width / 2, 2);

            Brush[] mybrush=new Brush[]{Brushes.Aqua,Brushes.AntiqueWhite,Brushes.AliceBlue,Brushes.Chocolate};
            Rectangle r = new Rectangle(25, 25, 400, 400);
            float angle = 0;
            float sangle=0;
            for (int i = 0; i < mylist.Count; i++)
            {
                angle = pangle * mylist[i];
                g.DrawPie(Pens.Brown, r, sangle, angle);
                g.FillPie(mybrush[i], r, sangle, angle);
                sangle = sangle + angle;
               
            }
            MemoryStream ms = new MemoryStream();
            bmp.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
            this.Width = 500;
            this.Height = 500;
            pictureBox1.Width = 455;
            pictureBox1.Height = 455;
            pictureBox1.Image = Image.FromStream(ms);
            ms.Close();
        }

//画曲线图
        private void button5_Click(object sender, EventArgs e)
        {
            this.Height = 600;
            this.Width = 500;
            pictureBox1.Height = 500;
            pictureBox1.Width = 450;
            int[] a = new int[] { 30, 20, 50, 40, 40, 78, 45, 98, 87, 47, 46, 98 };
            int w = 400;
            int h = 450;
            Bitmap bmp = new Bitmap(w, h);
            Graphics g = Graphics.FromImage(bmp);
            g.Clear(Color.White);
            g.DrawRectangle(Pens.AliceBlue, 0, 0, 399, 399);
            string title = "2009销售情况统计表";
            Font f = new Font("黑体", 16);
            g.DrawString(title, f, Brushes.Blue, (w / 2 - g.MeasureString(title, f).Width / 2), 2);
            float v_width = w;
            float v_height = w - 2 - g.MeasureString(title, f).Height - 10;
            float p_width = w / 25;
            float p_heigth = v_height / 150;
            float x = 0;
            float y = 0;
            float x1 = 0;
            float y1 = 0;
            double k = 0;
           
            Font f9 = new Font("宋体", 9);
            for (int i = 0; i < 11; i++)
            {
                x1 = ((i+1) * 2 + 1) * p_width;
                y1 = h - 50 - p_heigth * a[i+1];
                x = (i * 2 + 1) * p_width;
                y = h-50 - p_heigth * a[i];

                Point p1 = new Point((int)x, (int)y);
                Point p2 = new Point((int)x1, (int)y1);

               g.DrawLine(Pens.BlueViolet, p1, p2);
               
                k = i + 1;
                g.DrawString(k.ToString() + "月", f9, Brushes.Black, x, w + 2);

                g.DrawString(a[i].ToString(), f9, Brushes.Black, x - 4, y - 2 - g.MeasureString(a[i].ToString(), f9).Width / 2 - 2);
               
            }
            MemoryStream ms = new MemoryStream();
            bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
            Image img = Image.FromStream(ms);
            pictureBox1.Image = img;
            ms.Close();
        }
    }
}