C# 绘制统计图(柱状图, 折线图, 扇形图)

一. 柱状图的绘制.

绘制步骤如下:

1. 定义绘图用到的类.

定义绘图类
int height = 500, width = 700;
Bitmap image = new Bitmap(width, height);
Graphics g = Graphics.FromImage(image);
Pen mypen = new Pen(brush, 1);

1. 绘制图框.

绘制图框
g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);

1. 绘制横向坐标线

绘制横向坐标线
for (int i = 0; i < 14; i++)
{
g.DrawLine(mypen, x, 80, x, 340);
x = x + 40;
}

1. 绘制纵向坐标线

绘制纵向坐标线
for (int i = 0; i < 9; i++)
{
g.DrawLine(mypen, 60, y, 620, y);
y = y + 26;
}

1. 绘制横坐标值

绘制横坐标值
String[] n = { “第一期”, “第二期”, “第三期”, “第四期”, “全年” };
for (int i = 0; i < 7; i++)
{
g.DrawString(n[i].ToString(), font, Brushes.Blue, x, 348);
x = x + 78;
}

1. 绘制纵坐标值

绘制纵坐标
String[] m = {“250”,”225”, “200”, “175”, “150”, “125”, “100“};
for (int i = 0; i < 10; i++)
{
g.DrawString(m[i].ToString(), font, Brushes.Blue, 25, y);
y = y + 26;
}

1. 定义数组存储数据库中统计的数据

定义存储统计数据的数组
int[] Count1 = new int[7]; //存储从数据库读取的报名人数
int[] Count2 = new int[7]; //存储从数据库读取的通过人数

1. 从数据库中读取报名人数与通过人数

读取数据
SqlConnection Con = new SqlConnection(
“Server=(Local);Database=committeeTraining;”);
Con.Open();
string cmdtxt2 = “SELECT * FROM ##Count
where Company=’” + **+ “’”;
SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, Con);
DataSet ds = new DataSet();
da.Fill(ds);

1. 将读取的数据存储到数组中

将数据存储到数组中
Count1[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count1”].ToString());
Count1[1] = Convert.ToInt32(ds.Tables[0].Rows[0][“count3”].ToString());
Count2[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count2”].ToString());
Count2[1] = Convert.ToInt32(ds.Tables[0].Rows[0][“count4”].ToString());

10.定义画笔和画刷准备绘图

准备绘制柱状图
x = 80;
Font font2 = new System.Drawing.Font(
“Arial”, 10, FontStyle.Bold);
SolidBrush mybrush = new SolidBrush(Color.Red);
SolidBrush mybrush2 = new SolidBrush(Color.Green);

1. 根据数组中的值绘制柱状图

绘制柱状图

(1)第一期报名人数
g.FillRectangle(mybrush, x, 340 - Count1[0], 20, Count1[0]);
g.DrawString(Count1[0].ToString(), font2,
Brushes.Red, x, 340 - Count1[0] - 15);

(2) 第一期通过人数
x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[0], 20, Count2[0]);
g.DrawString(Count2[0].ToString(), font2,
Brushes.Green, x, 340 - Count2[0] - 15);

1. 将图形输出到页面.

将页面输出到页中
System.IO.MemoryStream ms = new
System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = “image/Jpeg”;
Response.BinaryWrite(ms.ToArray());

最终柱状图的效果图:

柱状图的完整代码:

绘制柱状统计图的完整代码
private void CreateImage()
{
int height = 500, width = 700;
Bitmap image = new Bitmap(width, height);
//创建Graphics类对象
Graphics g = Graphics.FromImage(image);

try
{
//清空图片背景色
g.Clear(Color.White);

Font font = new Font(“Arial”, 10, FontStyle.Regular);
Font font1 = new Font(“宋体”, 20, FontStyle.Bold);

LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
Color.Blue, Color.BlueViolet, 1.2f, true);
g.FillRectangle(Brushes.WhiteSmoke, 0, 0, width, height);
// Brush brush1 = new SolidBrush(Color.Blue);

g.DrawString(this.ddlTaget.SelectedItem.Text + ” ” + this.ddlYear.SelectedItem.Text +
” 成绩统计柱状图”, font1, brush, new PointF(70, 30));
//画图片的边框线
g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 1, image.Height - 1);

Pen mypen = new Pen(brush, 1);
//绘制线条
//绘制横向线条
int x = 100;
for (int i = 0; i < 14; i++)
{
g.DrawLine(mypen, x, 80, x, 340);
x = x + 40;
}
Pen mypen1 = new Pen(Color.Blue, 2);
x = 60;
g.DrawLine(mypen1, x, 80, x, 340);

//绘制纵向线条
int y = 106;
for (int i = 0; i < 9; i++)
{
g.DrawLine(mypen, 60, y, 620, y);
y = y + 26;
}
g.DrawLine(mypen1, 60, y, 620, y);

//x轴
String[] n = { “第一期”, “第二期”, “第三期”, “第四期”, “上半年”, “下半年”, “全年统计” };
x = 78;
for (int i = 0; i < 7; i++)
{
g.DrawString(n[i].ToString(), font, Brushes.Blue, x, 348); //设置文字内容及输出位置
x = x + 78;
}

//y轴
String[] m = {“250”,”225”, “200”, “175”, “150”, “125”, “100”, ” 75”,
” 50”, ” 25”, ” 0”};
y = 72;
for (int i = 0; i < 10; i++)
{
g.DrawString(m[i].ToString(), font, Brushes.Blue, 25, y); //设置文字内容及输出位置
y = y + 26;
}

int[] Count1 = new int[7];
int[] Count2 = new int[7];

SqlConnection Con = new SqlConnection(“Server=(Local);Database=committeeTraining;Uid=sa;Pwd=**”);
Con.Open();
string cmdtxt2 = “SELECT * FROM ##Count where Company=’” + this.ddlTaget.SelectedItem.Text.Trim() + “’”;
SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, Con);
DataSet ds = new DataSet();
da.Fill(ds);

Count1[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count1”].ToString());
Count1[1] = Convert.ToInt32(ds.Tables[0].Rows[0][“count3”].ToString());
Count1[2] = Convert.ToInt32(ds.Tables[0].Rows[0][“count5”].ToString());
Count1[3] = Convert.ToInt32(ds.Tables[0].Rows[0][“count7”].ToString());

Count1[4] = Count1[0] + Count1[1];
Count1[5] = Count1[2] + Count1[3];

Count1[6] = Convert.ToInt32(ds.Tables[0].Rows[0][“count9”].ToString());

Count2[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count2”].ToString());
Count2[1] = Convert.ToInt32(ds.Tables[0].Rows[0][“count4”].ToString());
Count2[2] = Convert.ToInt32(ds.Tables[0].Rows[0][“count6”].ToString());
Count2[3] = Convert.ToInt32(ds.Tables[0].Rows[0][“count8”].ToString());

Count2[4] = Count2[0] + Count2[1];
Count2[5] = Count2[2] + Count2[3];

Count2[6] = Convert.ToInt32(ds.Tables[0].Rows[0][“count10”].ToString());

//绘制柱状图.
x = 80;
Font font2 = new System.Drawing.Font(“Arial”, 10, FontStyle.Bold);
SolidBrush mybrush = new SolidBrush(Color.Red);
SolidBrush mybrush2 = new SolidBrush(Color.Green);

//第一期
g.FillRectangle(mybrush, x, 340 - Count1[0], 20, Count1[0]);
g.DrawString(Count1[0].ToString(), font2, Brushes.Red, x, 340 - Count1[0] - 15);

x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[0], 20, Count2[0]);
g.DrawString(Count2[0].ToString(), font2, Brushes.Green, x, 340 - Count2[0] - 15);

//第二期
x = x + 60;
g.FillRectangle(mybrush, x, 340 - Count1[1], 20, Count1[1]);
g.DrawString(Count1[1].ToString(), font2, Brushes.Red, x, 340 - Count1[1] - 15);

x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[1], 20, Count2[1]);
g.DrawString(Count2[1].ToString(), font2, Brushes.Green, x, 340 - Count2[1] - 15);

//第三期
x = x + 60;
g.FillRectangle(mybrush, x, 340 - Count1[2], 20, Count1[2]);
g.DrawString(Count1[2].ToString(), font2, Brushes.Red, x, 340 - Count1[2] - 15);

x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[2], 20, Count2[2]);
g.DrawString(Count2[2].ToString(), font2, Brushes.Green, x, 340 - Count2[2] - 15);

//第四期
x = x + 60;
g.FillRectangle(mybrush, x, 340 - Count1[3], 20, Count1[3]);
g.DrawString(Count1[3].ToString(), font2, Brushes.Red, x, 340 - Count1[3] - 15);

x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[3], 20, Count2[3]);
g.DrawString(Count2[3].ToString(), font2, Brushes.Green, x, 340 - Count2[3] - 15);

//上半年
x = x + 60;
g.FillRectangle(mybrush, x, 340 - Count1[4], 20, Count1[4]);
g.DrawString(Count1[4].ToString(), font2, Brushes.Red, x, 340 - Count1[4] - 15);

x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[4], 20, Count2[4]);
g.DrawString(Count2[4].ToString(), font2, Brushes.Green, x, 340 - Count2[4] - 15);

//下半年
x = x + 60;
g.FillRectangle(mybrush, x, 340 - Count1[5], 20, Count1[5]);
g.DrawString(Count1[5].ToString(), font2, Brushes.Red, x, 340 - Count1[5] - 15);

x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[5], 20, Count2[5]);
g.DrawString(Count2[5].ToString(), font2, Brushes.Green, x, 340 - Count2[5] - 15);

//全年
x = x + 60;
g.FillRectangle(mybrush, x, 340 - Count1[6], 20, Count1[6]);
g.DrawString(Count1[6].ToString(), font2, Brushes.Red, x, 340 - Count1[6] - 15);

x = x + 20;
g.FillRectangle(mybrush2, x, 340 - Count2[6], 20, Count2[6]);
g.DrawString(Count2[6].ToString(), font2, Brushes.Green, x, 340 - Count2[6] - 15);

//绘制标识
Font font3 = new System.Drawing.Font(“Arial”, 10, FontStyle.Regular);
g.DrawRectangle(new Pen(Brushes.Blue), 170, 400, 250, 50); //绘制范围框
g.FillRectangle(Brushes.Red, 270, 410, 20, 10); //绘制小矩形
g.DrawString(“报名人数”, font3, Brushes.Red, 292, 408);

g.FillRectangle(Brushes.Green, 270, 430, 20, 10);
g.DrawString(“通过人数”, font3, Brushes.Green, 292, 428);

System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = “image/Jpeg”;
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}

二. 折线统计图的绘制
效果:

折线图的完整代码:

折线图的完整代码
private void CreateImage()
{
int height = 480, width = 700;
Bitmap image = new Bitmap(width, height);
Graphics g = Graphics.FromImage(image);

try
{
//清空图片背景色
g.Clear(Color.White);

Font font = new System.Drawing.Font(“Arial”, 9, FontStyle.Regular);
Font font1 = new System.Drawing.Font(“宋体”, 20, FontStyle.Regular);
Font font2 = new System.Drawing.Font(“Arial”, 8, FontStyle.Regular);
LinearGradientBrush brush = new LinearGradientBrush(
new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Blue, 1.2f, true);
g.FillRectangle(Brushes.AliceBlue, 0, 0, width, height);
Brush brush1 = new SolidBrush(Color.Blue);
Brush brush2 = new SolidBrush(Color.SaddleBrown);

g.DrawString(this.ddlTaget.SelectedItem.Text + ” ” + this.ddlYear.SelectedItem.Text +
” 成绩统计折线图”, font1, brush1, new PointF(85, 30));
//画图片的边框线
g.DrawRectangle(new Pen(Color.Blue), 0, 0, image.Width - 1, image.Height - 1);

Pen mypen = new Pen(brush, 1);
Pen mypen2 = new Pen(Color.Red, 2);
//绘制线条
//绘制纵向线条
int x = 60;
for (int i = 0; i < 8; i++)
{
g.DrawLine(mypen, x, 80, x, 340);
x = x + 80;
}
Pen mypen1 = new Pen(Color.Blue, 3);
x = 60;
g.DrawLine(mypen1, x, 82, x, 340);

//绘制横向线条
int y = 106;
for (int i = 0; i < 10; i++)
{
g.DrawLine(mypen, 60, y, 620, y);
y = y + 26;
}
// y = 106;
g.DrawLine(mypen1, 60, y - 26, 620, y - 26);

//x轴
String[] n = { “第一期”, “第二期”, “第三期”, “第四期”, “上半年”, “下半年”, “全年统计” };
x = 45;
for (int i = 0; i < 7; i++)
{
g.DrawString(n[i].ToString(), font, Brushes.Red, x, 348); //设置文字内容及输出位置
x = x + 77;
}

//y轴
String[] m = { “220人”, ” 200人”, ” 175人”, “150人”, ” 125人”, ” 100人”, ” 75人”, ” 50人”,
” 25人”};
y = 100;
for (int i = 0; i < 9; i++)
{
g.DrawString(m[i].ToString(), font, Brushes.Red, 10, y); //设置文字内容及输出位置
y = y + 26;
}

int[] Count1 = new int[7];
int[] Count2 = new int[7];

SqlConnection Con = new SqlConnection(“Server=(Local);Database=committeeTraining;Uid=sa;Pwd=eesoft”);
Con.Open();
string cmdtxt2 = “SELECT * FROM ##Count where Company=’” + this.ddlTaget.SelectedItem.Text.Trim() + “’”;
SqlDataAdapter da = new SqlDataAdapter(cmdtxt2, Con);
DataSet ds = new DataSet();
da.Fill(ds);

//报名人数
Count1[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count1”].ToString());
Count1[1] = Convert.ToInt32(ds.Tables[0].Rows[0][“count3”].ToString());
Count1[2] = Convert.ToInt32(ds.Tables[0].Rows[0][“count5”].ToString());
Count1[3] = Convert.ToInt32(ds.Tables[0].Rows[0][“count7”].ToString());

Count1[6] = Convert.ToInt32(ds.Tables[0].Rows[0][“count9”].ToString()); //全年

Count1[4] = Count1[0] + Count1[1];
Count1[5] = Count1[2] + Count1[3];

Count2[0] = Convert.ToInt32(ds.Tables[0].Rows[0][“count2”].ToString());
Count2[1] = Convert.ToInt32(ds.Tables[0].Rows[0][“count4”].ToString());
Count2[2] = Convert.ToInt32(ds.Tables[0].Rows[0][“count6”].ToString());
Count2[3] = Convert.ToInt32(ds.Tables[0].Rows[0][“count8”].ToString());

Count2[6] = Convert.ToInt32(ds.Tables[0].Rows[0][“count10”].ToString()); //全年

Count2[4] = Count2[0] + Count2[1];
Count2[5] = Count2[2] + Count2[3];

//显示折线效果
Font font3 = new System.Drawing.Font(“Arial”, 10, FontStyle.Bold);
SolidBrush mybrush = new SolidBrush(Color.Red);
Point[] points1 = new Point[7];
points1[0].X = 60; points1[0].Y = 340 - Count1[0]; //从106纵坐标开始, 到(0, 0)坐标时
points1[1].X = 140; points1[1].Y = 340 - Count1[1];
points1[2].X = 220; points1[2].Y = 340 - Count1[2];
points1[3].X = 300; points1[3].Y = 340 - Count1[3];

points1[4].X = 380; points1[4].Y = 340 - Count1[4];
points1[5].X = 460; points1[5].Y = 340 - Count1[5];

points1[6].X = 540; points1[6].Y = 340 - Count1[6];
g.DrawLines(mypen2, points1); //绘制折线

//绘制数字
g.DrawString(Count1[0].ToString(), font3, Brushes.Red, 58, points1[0].Y - 20);
g.DrawString(Count1[1].ToString(), font3, Brushes.Red, 138, points1[1].Y - 20);
g.DrawString(Count1[2].ToString(), font3, Brushes.Red, 218, points1[2].Y - 20);
g.DrawString(Count1[3].ToString(), font3, Brushes.Red, 298, points1[3].Y - 20);

g.DrawString(Count1[4].ToString(), font3, Brushes.Red, 378, points1[4].Y - 20);
g.DrawString(Count1[5].ToString(), font3, Brushes.Red, 458, points1[5].Y - 20);

g.DrawString(Count1[6].ToString(), font3, Brushes.Red, 538, points1[6].Y - 20);

Pen mypen3 = new Pen(Color.Green, 2);
Point[] points2 = new Point[7];
points2[0].X = 60; points2[0].Y = 340 - Count2[0];
points2[1].X = 140; points2[1].Y = 340 - Count2[1];
points2[2].X = 220; points2[2].Y = 340 - Count2[2];
points2[3].X = 300; points2[3].Y = 340 - Count2[3];

points2[4].X = 380; points2[4].Y = 340 - Count2[4];
points2[5].X = 460; points2[5].Y = 340 - Count2[5];

points2[6].X = 540; points2[6].Y = 340 - Count2[6];
g.DrawLines(mypen3, points2); //绘制折线

//绘制通过人数
g.DrawString(Count2[0].ToString(), font3, Brushes.Green, 61, points2[0].Y - 15);
g.DrawString(Count2[1].ToString(), font3, Brushes.Green, 131, points2[1].Y - 15);
g.DrawString(Count2[2].ToString(), font3, Brushes.Green, 221, points2[2].Y - 15);
g.DrawString(Count2[3].ToString(), font3, Brushes.Green, 301, points2[3].Y - 15);

g.DrawString(Count2[4].ToString(), font3, Brushes.Green, 381, points2[4].Y - 15);
g.DrawString(Count2[5].ToString(), font3, Brushes.Green, 461, points2[5].Y - 15);

g.DrawString(Count2[6].ToString(), font3, Brushes.Green, 541, points2[6].Y - 15);

//绘制标识
g.DrawRectangle(new Pen(Brushes.Red), 180, 390, 250, 50); //绘制范围框
g.FillRectangle(Brushes.Red, 270, 402, 20, 10); //绘制小矩形
g.DrawString(“报名人数”, font2, Brushes.Red, 292, 400);

g.FillRectangle(Brushes.Green, 270, 422, 20, 10);
g.DrawString(“通过人数”, font2, Brushes.Green, 292, 420);

System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
Response.ClearContent();
Response.ContentType = “image/Jpeg”;
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}

三. 扇形统计图的绘制
效果图:

完整代码:
扇形统计图的绘制
private void CreateImage()
{
//把连接字串指定为一个常量
SqlConnection Con = new SqlConnection(“Server=(Local);
Database=committeeTraining;Uid=sa;Pwd=**”);
Con.Open();
string cmdtxt = selectString; // “select * from ##Count”; //
//SqlCommand Com = new SqlCommand(cmdtxt, Con);
DataSet ds = new DataSet();
SqlDataAdapter Da = new SqlDataAdapter(cmdtxt, Con);
Da.Fill(ds);
Con.Close();
float Total = 0.0f, Tmp;

//转换成单精度。也可写成Convert.ToInt32
Total = Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]]);

// Total=Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]]);
//设置字体，fonttitle为主标题的字体
Font fontlegend = new Font(“verdana”, 9);
Font fonttitle = new Font(“verdana”, 10, FontStyle.Bold);

//背景宽
int width = 350;
int bufferspace = 15;
int legendheight = fontlegend.Height * 10 + bufferspace; //高度
int titleheight = fonttitle.Height + bufferspace;
int height = width + legendheight + titleheight + bufferspace;//白色背景高
int pieheight = width;
Rectangle pierect = new Rectangle(0, titleheight, width, pieheight);

//加上各种随机色
ArrayList colors = new ArrayList();
Random rnd = new Random();
for (int i = 0; i < 2; i++)
colors.Add(new SolidBrush(Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255))));

//创建一个bitmap实例
Bitmap objbitmap = new Bitmap(width, height);
Graphics objgraphics = Graphics.FromImage(objbitmap);

//画一个白色背景
objgraphics.FillRectangle(new SolidBrush(Color.White), 0, 0, width, height);

//画一个亮黄色背景
objgraphics.FillRectangle(new SolidBrush(Color.Beige), pierect);

//以下为画饼图(有几行row画几个)
float currentdegree = 0.0f;

//画通过人数
objgraphics.FillPie((SolidBrush)colors[1], pierect, currentdegree,
Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]) / Total * 360);
currentdegree += Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]) / Total * 360;

//未通过人数饼状图
objgraphics.FillPie((SolidBrush)colors[0], pierect, currentdegree,
((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]]))-(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]))) / Total * 360);
currentdegree += ((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])) -
(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]))) / Total * 360;

//以下为生成主标题
SolidBrush blackbrush = new SolidBrush(Color.Black);
SolidBrush bluebrush = new SolidBrush(Color.Blue);
string title = ” 机关单位成绩统计饼状图: ”
+ “\n \n\n”;
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.LineAlignment = StringAlignment.Center;

objgraphics.DrawString(title, fonttitle, blackbrush,
new Rectangle(0, 0, width, titleheight), stringFormat);

//列出各字段与得数目
objgraphics.DrawRectangle(new Pen(Color.Red, 2), 0, height + 10 - legendheight, width, legendheight + 50);

objgraphics.DrawString(“—————-统计信息——————”,
fontlegend, bluebrush, 20, height - legendheight + fontlegend.Height * 1 + 1);
objgraphics.DrawString(“统计单位: ” + this.ddlTaget.SelectedItem.Text,
fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 3 + 1);
objgraphics.DrawString(“统计年份: ” + this.ddlYear.SelectedItem.Text,
fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 4 + 1);
objgraphics.DrawString(“统计期数: ” + this.ddlSpan.SelectedItem.Text,
fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 5 + 1);

objgraphics.FillRectangle((SolidBrush)colors[1], 5,height - legendheight + fontlegend.Height * 8 + 1, 10, 10);
objgraphics.DrawString(“报名总人数: ” + Convert.ToString(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])),
fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 7 + 1);
objgraphics.FillRectangle((SolidBrush)colors[0], 5, height - legendheight + fontlegend.Height * 9 + 1, 10, 10);
objgraphics.DrawString(“通过总人数: ” + Convert.ToString(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]])),
fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 8 + 1);
objgraphics.DrawString(“未通过人数: ” + ((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])) -
(Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]))), fontlegend, blackbrush, 20, height - legendheight + fontlegend.Height * 9 + 1);

objgraphics.DrawString(“通过率: ” + Convert.ToString((Convert.ToSingle(ds.Tables[0].Rows[0][this.count[1]]) /
Convert.ToSingle(ds.Tables[0].Rows[0][this.count[0]])) * 100)+ ” %”, fontlegend,
blackbrush, 20, height - legendheight + fontlegend.Height * 10 + 1);

Response.ContentType = “image/Jpeg”;
objbitmap.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
objgraphics.Dispose();
objbitmap.Dispose();

}