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.Data.SqlClient;
namespace RoundCaky
{
public partial class Frm_Main : Form
{
public class PyPanel : Panel
{
public PyPanel()
{
SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
UpdateStyles();
}
}
public Frm_Main()
{
InitializeComponent();
}
SqlConnection con;
SqlCommand cmd;
private void Conn()
{
con = new SqlConnection("server=.;uid=sa;pwd=Server2012;database=db_TomeOne");
con.Open();
}
Bitmap bt;
Bitmap bt1;
int flag = 0;
PyPanel panel1 = new PyPanel();
private void ShowPic(string SexCode, float f) // ShowPic方法绘制饼图
{
this.Controls.Add(panel1); //将Panel控件添加到窗体中
panel1.Width = 230; //设置Panel控件的宽度
panel1.Height = 230; //设置Panel控件的高度
bt = new Bitmap(panel1.Width, panel1.Height); //创建画布
Graphics g = Graphics.FromImage(bt); //创建Graphics对象
Pen p = new Pen(new SolidBrush(Color.Blue)); //创建画笔
Point p1 = new Point(0, 0); //创建一个Point对象
Size s = new Size(this.panel1.Width, this.panel1.Height); //创建Size对象
Rectangle trct = new Rectangle(p1, s); //创建Rectangle对象
g.FillEllipse(new SolidBrush(Color.Red), trct); //绘制椭圆
g.FillPie(new SolidBrush(Color.Blue), trct, flag, f * 360); //绘制扇形
bt1 = new Bitmap(panel2.Width, panel2.Height); //创建画布
Graphics ginfo = Graphics.FromImage(bt1); //创建Graphics对象
Font font = new Font("宋体", 10, FontStyle.Regular); //设置字体
ginfo.DrawString(SexCode + " " + f.ToString().Substring(0, 4), font, new SolidBrush(Color.Blue), 0, 5);
ginfo.DrawString("女" + " " + (1.0 - Convert.ToDouble(f.ToString().Substring(0, 4))).ToString().Substring(0, 4), font, new SolidBrush(Color.Red), 0, 25); //绘制性别及比率
panel1.BackgroundImage = bt; //显示饼图
panel2.BackgroundImage = bt1; //显示性别及比率
}
private void button1_Click(object sender, EventArgs e) //单击“显示”按钮显示饼图
{
Conn(); //连接数据库
using (cmd = new SqlCommand("SELECT sex,COUNT(sex) num FROM tb_sex group by sex", con))
{
SqlDataReader dr = cmd.ExecuteReader(); //创建SqlDataReader对象
string[] str = new string[2];
int i = 0;
while (dr.Read()) //读取记录
{
str[i] = dr[0].ToString() + "," + dr[1].ToString(); //获取数据库中存储的性别及比例
i++;
}
float N = Convert.ToInt16(str[0].Substring(2)) + Convert.ToInt16(str[1].Substring(2));//男女性别比例之和
float f = Convert.ToInt16(str[0].Substring(2)) / N; //男性的比例
flag = 180; //开始绘制的起始角度
ShowPic(str[0].Substring(0, 1), f); //调用ShowPic方法绘制饼图
}
con.Close();
}
private void timer1_Tick(object sender, EventArgs e) //当单击“旋转”按钮时开始旋转饼图
{
flag += 1; //每次转动一度
Conn(); //连接数据库
using (cmd = new SqlCommand("SELECT sex,COUNT(sex) num FROM tb_sex group by sex", con))
{
SqlDataReader dr = cmd.ExecuteReader(); //创建SqlDataReader对象
string[] str = new string[2]; //声明数组存储性别及比例
int i = 0;
while (dr.Read())
{
str[i] = dr[0].ToString() + "," + dr[1].ToString(); //获取数据库中存储的性别及比例
i++;
}
float N = Convert.ToInt16(str[0].Substring(2)) + Convert.ToInt16(str[1].Substring(2)); //男女性别比例之和
float f = Convert.ToInt16(str[0].Substring(2)) / N; //男性的比例
ShowPic(str[0].Substring(0, 1), f); //调用ShowPic方法绘制饼图
}
con.Close(); //关闭连接
}
private void button2_Click(object sender, EventArgs e) //“旋转”按钮
{
if (button2.Text == "旋转") //如果按钮显示“旋转”文本
{
timer1.Start(); //开始Timer控件
button2.Text = "停止"; //将按钮的文本设为“停止”
}
else //如果按钮的文本为“停止”
{
timer1.Stop(); //停止Timer控件
button2.Text = "旋转"; //将按钮的文本设为“旋转”
}
}
}
}
