Question

net Chart控件怎么显示一个饼状图

Answer 1

你可以参考下这个
利用饼形图分析公司男女比例
private void Conn()
{
con = new SqlConnection("server=WRET-MOSY688YVW\\MRGLL;uid=sa;pwd=;database=db_TomeOne");
con.Open();
}

private void ShowPic(string SexCode, float f)
{
Graphics g = this.panel1.CreateGraphics(); //通过panel1控件创建一个Graphics对象
Pen p = new Pen(new SolidBrush(Color.Blue)); //创建画笔
Point p1 = new Point(0, 0); //创建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, 180, f * 360); //绘制扇形
Graphics ginfo = this.panel2.CreateGraphics(); //通过panel2控件创建一个Graphics对象
Font font = new Font("宋体", 10, FontStyle.Regular); //设置字体
//绘制性别
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);
//绘制比例CodeGo.net/
}

private void Form1_Paint(object sender, PaintEventArgs e)
{
Conn();
using (cmd = new SqlCommand("SELECT sex,COUNT(sex) num FROM tb_sex group by sex", con))
{
SqlDataReader dr=cmd.ExecuteReader();
string[] str = new string[2];
int i=0;
while (dr.Read())
{
str[i] = dr[0].ToString() + "," + dr[1].ToString();
i++;
}
float N = Convert.ToInt16(str[0].Substring(2)) + Convert.ToInt16(str[1].Substring(2));
float f = Convert.ToInt16(str[0].Substring(2))/N;
ShowPic(str[0].Substring(0,1), f);
}
}