Use ASP.net Gao chart (available for various voting procedures)

Use ASP.net Gao chart (available for various voting procedures)
Compared with the ASP asp.net has more powerful features, the use of GDI + can easily achieve a lot of previously impossible graphics features.
First, build the library Mess.mdb in the C:\, and build the table title.
Build two fields, title (char), point (int type)
Very Satisfied 281
More Satisfied 297
It's 166.
Not satisfied with 416
I also wrote sections that draw lines and bars and are now writing them all into a class. Need to contact me: mailto:ouyang76@263.net
<%@ Page language= "C #"%>
<% @importNamespace= "System.Data"%>
<% @importNamespace= "System.Data.OleDb"%>
<% @importNamespace= "System.Drawing"%>
<% @importNamespace= "System.Drawing.Imaging"%>
<script language= "C #" runat= "Server" >
public void Page_Load (Object Obj,eventargs E)
{
Specify the connection string as a constant
Const String strconn = "provider=microsoft.jet.oledb.4.0;" +
"Data Source=c:\\mess.mdb";
OleDbConnection conn=new OleDbConnection (strconn);
Conn. Open ();
String Sql= "select * from title";
OleDbCommand cmd=new OleDbCommand (sql,conn);
DataSet ds=new DataSet ();
OleDbDataAdapter adapter1=new OleDbDataAdapter (cmd);
Adapter1. Fill (DS);
Conn. Close ();
float total=0.0f,tmp;
int iloop;
For (Iloop=0;iloop<ds. Tables[0]. rows.count;iloop++)
{
Tmp=convert.tosingle (ds. Tables[0]. rows[iloop]["point"]);//Convert to single precision, the vote can not be cast half-price. Can also be written as Convert.ToInt32
total+=tmp;
}
Response.Write (Convert.ToString (total));

Font fontlegend=new font ("Verdana", 9), fonttitle=new font ("Verdana", 10,fontstyle.bold);/Set Fonts
Fonttitle font for primary headers

int width=230;//white background width
const int bufferspace=15;
int Legendheight=fontlegend. Height* (ds. Tables[0]. rows.count+1) +bufferspace;
int titleheight = Fonttitle. Height + bufferspace;
int height = width + legendheight + titleheight + bufferspace;//white background high
int pieheight = width;
Rectangle pierect=new Rectangle (0,titleheight,width,pieheight);

Plus a variety of random colors
ArrayList colors = new ArrayList ();
Random rnd = new Random ();
for (iloop = 0; Iloop < ds. Tables[0]. Rows.Count; iloop++)
Colors. ADD (New SolidBrush (COLOR.FROMARGB) (Rnd. Next (255), Rnd. Next (255), Rnd. Next (255)));

Bitmap objbitmap=new Bitmap (width,height);//Create a Bitmap instance
//bitmap objbitmap=new Bitmap (230,500); Create a bitmap instance
Graphics objgraphics=graphics.fromimage (objbitmap);

Objgraphics. FillRectangle (New SolidBrush (Color.White), 0, 0, width, height);//Draw a white background
Objgraphics. FillRectangle (New SolidBrush (Color.lightyellow), pierect);//Draw a bright yellow background
The following is a Gao diagram (several rows of row paintings)
float currentdegree=0.0f;
for (iloop = 0; Iloop < ds. Tables[0]. Rows.Count; iloop++)
{
Objgraphics. FillPie ((SolidBrush) Colors[iloop], Pierect, Currentdegree,
Convert.tosingle (ds. Tables[0]. rows[iloop]["point"])/total * 360);
Currentdegree + = Convert.tosingle (ds. Tables[0]. rows[iloop]["point"])/total * 360;
}
---The following is the build main title
SolidBrush blackbrush=new SolidBrush (color.black);
String title= "The programmer base Camp" launched a matching special issue, are you satisfied with the special issue? ";
StringFormat StringFormat = new StringFormat ();
Stringformat.alignment = Stringalignment.center;
Stringformat.linealignment = Stringalignment.center;

Objgraphics. DrawString (title, Fonttitle, Blackbrush,
New Rectangle (0, 0, Width, titleheight), StringFormat);
List each field with the number of votes
Objgraphics. DrawRectangle (New Pen (Color.Black, 2), 0, height-legendheight, width, legendheight);
for (iloop = 0; Iloop < ds. Tables[0]. Rows.Count; iloop++)
{
Objgraphics. FillRectangle (SolidBrush) Colors[iloop], 5, Height-legendheight + fontlegend. Height * Iloop + 5, 10, 10);
Objgraphics. DrawString ((String) ds. Tables[0]. rows[iloop]["title"]) + "-" + convert.tostring (ds. Tables[0]. rows[iloop]["Point"]), Fontlegend, Blackbrush,
Height-legendheight + fontlegend. Height * iloop + 1);
}
//
Objgraphics. DrawString ("Total number of votes is:" +convert.tostring), Fontlegend,blackbrush, 5, Height-fontlegend. Height);
Total height of the image-the height of a line of fonts, that is, the height of one line of height-fontlegend for the bottom row. Height)
Response.contenttype= "Image/jpeg";
Objbitmap. Save (Response.outputstream,imageformat.jpeg);
Objbitmap. Save ("Myyyyyyyyyyy.jpg", imageformat.jpeg);//Output to File

Objgraphics. Dispose ();
Objbitmap. Dispose ();
}
</script>