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How to draw picture in web?

19 Apr, 2008

Author: yansoft

Summary
this show the way to drawing picture with data from database

.NET Classes used :

void CreatePieChart( DataSet ds,String dataColumnName, String title, int width)
{

float total = 0.0F, tmp;
int iLoop;
// find the total of the numeric data
for (iLoop = 0; iLoop < ds.Tables[0].Rows.Count; iLoop++)
{
tmp = Convert.ToSingle(ds.Tables[0].Rows[iLoop][dataColumnName]);
total += tmp;
}
Font fontLegend = new Font("Verdana", 10),
fontTitle = new Font("Verdana", 15, FontStyle.Bold);
// We need to create a legend and title, how big do these need to be?
// Also, we need to resize the height for the pie chart, respective
// to the height of the legend and title
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;
int pieHeight = width;
Bitmap objBitmap = new Bitmap(width,height);
Graphics objGraphics = Graphics.FromImage(objBitmap);
objGraphics.Clear(Color.White);
// maintain a one-to-one ratio
// Create a rectange for drawing our pie
Rectangle pieRect = new Rectangle(0, titleHeight,width,pieHeight);
// Create our pie chart, start by creating an ArrayList of 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))));
float startsingle = 0.0F;
float sweepsingle=0.0F;
StringFormat format = new StringFormat();
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
for(iLoop=0;iLoop {

sweepsingle=360* Convert.ToSingle(ds.Tables[0].Rows[iLoop][dataColumnName])/total;
objGraphics.FillPie((SolidBrush)colors[iLoop], pieRect, startsingle, sweepsingle);
startsingle += sweepsingle;
objGraphics.DrawString(ds.Tables[0].Rows[iLoop]["??"].ToString() + "??", fontLegend, (SolidBrush)colors[iLoop], new Rectangle(0, pieHeight + titleHeight+(iLoop + 1) * bufferSpace, 150, 40), format);
}

// Create the title, centered
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.LineAlignment = StringAlignment.Center;

objGraphics.DrawString(title, fontTitle,new SolidBrush(Color.Red),
new Rectangle(0, 0, width, titleHeight), stringFormat);
// Since we are outputting a Jpeg, set the
// ContentType appropriately
Response.ContentType = "image/jpeg";

// Save the image to the OutputStream
objBitmap.Save(Response.OutputStream,
ImageFormat.Jpeg);
}

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