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 System.Drawing.Imaging;
using System.Data.SqlClient;
namespace GatherDataAnalyse
{
public partial class Frm_Main : Form
{
SqlConnection con;
SqlCommand cmd;
public Frm_Main()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
ShowPic();
}
private void Conn()
{
con = new SqlConnection("server=.;uid=sa;pwd=Server2012;database=db_TomeOne");
con.Open();
}
private void ShowPic()
{
Conn(); //打开数据库连接
using (cmd = new SqlCommand("SELECT TOP 3 * FROM tb_Rectangle order by t_Num desc", con)) ;//实例化SqlCommand对象
{
SqlDataReader dr = cmd.ExecuteReader(); //创建SqlDataReader对象
Bitmap bitM = new Bitmap(this.panel1.Width, this.panel1.Height); //实例化一个新画布
Graphics g = Graphics.FromImage(bitM); //创建Graphics对象
g.Clear(Color.White); //设置画布背景
for (int i = 0; i < 5; i++)
{
g.DrawLine(new Pen(new SolidBrush(Color.Red), 2.0f), 50, this.panel1.Height - 20 - i * 20, this.panel1.Width - 40, this.panel1.Height - 20 - i * 20); //绘制水平直线
g.DrawString(Convert.ToString(i * 100), new Font("Times New Roman", 10, FontStyle.Regular), new SolidBrush(Color.Black), 20, this.panel1.Height - 27 - i * 20); //绘制文字
}
for (int j = 0; j < 4; j++)
{
//绘制垂直直线
g.DrawLine(new Pen(new SolidBrush(Color.Red), 1.0f), 50 + 40 * j, this.panel1.Height - 20, 50 + 40 * j, 20);
if (dr.Read())
{
int x, y, w, h; //声明变量存储坐标和宽高
g.DrawString(dr[0].ToString(), new Font("宋体", 8, FontStyle.Regular), new SolidBrush(Color.Black), 76 + 40 * j, this.panel1.Height - 16); //绘制说明文字
x = 78 + 40 * j; //X轴
y = this.panel1.Height - 20 - Convert.ToInt32((Convert.ToDouble(Convert.ToDouble(dr[1].ToString()) * 20 / 100))); //Y轴
w = 24; //宽
h = Convert.ToInt32(Convert.ToDouble(dr[1].ToString()) * 20 / 100); //高
g.FillRectangle(new SolidBrush(Color.FromArgb(56, 129, 78)), x, y, w, h); //绘制柱形图
}
}
this.panel1.BackgroundImage = bitM; //将画布设为panel1控件的背景图
}
}
}
}
