用C#绘制统计图

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);

 

2. 绘制图框.

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

 

3. 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;
}

 

4. 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;
}

 

5. 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;
}

 

6. 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;
}

 

7. 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=newint[7];//存储从数据库读取的报名人数
int[] Count2=newint[7];//存储从数据库读取的通过人数

 

8. 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);

 

9. 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);

 

11. 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);

 

12. 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
privatevoid 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=newint[7];
int[] Count2=newint[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
privatevoid 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=newint[7];
int[] Count2=newint[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
privatevoid 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();