Reflected Bar Chart with GDI+ for ASP.NET 2.0

I dont know the name of this Graph. I searched a lot on the net to find the code for generating such a graph, but found only ordinary bar charts and histograms. Later I made a small program for generating such a graph and named 'reflected bar graph'. ;) I will rename it when I get the correct name.

private void DrawGraph(double[] yvalues)

{

Response.Clear();

double ybig = yvalues[0];

for (int i = 1; i < yvalues.Length; i++)

{

if (ybig < yvalues[i]) ybig = yvalues[i];

}

string str = string.Empty;

str = str.PadLeft(ybig.ToString().Length - 1, '0');

int devisor = int.Parse("1" + str);

ybig = ybig + (devisor - (ybig % devisor));

int x = 400, y = 400;

int margin = 40;

int xdistance = 30, ydistance = 15;

int ymiddle = y / 2;

// start desktop

Bitmap b = new Bitmap(x, y);

Graphics g = Graphics.FromImage(b);

Brush br = new SolidBrush(Color.White);

g.FillRectangle(br, 0, 0, x, y);

Pen p = new Pen(Color.LightBlue);

g.DrawRectangle(p, 0, 0, x - 1, y - 1);

ImageAttributes attr = new ImageAttributes();

Pen blackPen = new Pen(Color.Black, 3);

// end desktop

// start plot graph

Brush blackbrush = new SolidBrush(Color.Black);

Random r = new Random();

//Brush randombrush = new SolidBrush(Color.FromArgb(255, 228,228));

for (int i = 0, j = 0; i < yvalues.Length; i++, j += xdistance)

{

float yval = (float)((yvalues[i] * 10) / ybig) * ydistance;

Brush randombrush = new SolidBrush(Color.FromArgb(r.Next(155, 255), r.Next(155, 255), r.Next(155, 255)));

//g.FillRectangle(randombrush, margin + j, ymiddle - int.Parse(yvalues[i].ToString()) * ydistance, xdistance, int.Parse(yvalues[i].ToString()) *ydistance );

g.FillRectangle(randombrush, margin + j, ymiddle - yval, xdistance, yval);

// g.DrawRectangle(new Pen(Color.Gray), margin + j, ymiddle - float.Parse(yvalues[i].ToString()) * ydistance, xdistance, float.Parse(yvalues[i].ToString()) * ydistance);

}

g.CopyFromScreen(10, 10, 20, 20, Size.Empty);

//flip

Rectangle rect = new Rectangle(0, 0, x, ymiddle);

Bitmap b2 = (System.Drawing.Bitmap)b.Clone(rect, PixelFormat.Undefined);

b2.RotateFlip(RotateFlipType.RotateNoneFlipY);

g.DrawImage((System.Drawing.Image)b2, 0, ymiddle);

// end plot graph

// start guides

g.DrawLine(blackPen, margin, ymiddle, x - margin, ymiddle);

g.DrawLine(blackPen, margin, margin, margin, y - margin);

Font fnt = new Font("arial", 8);

for (int i = margin, j = 0; i < x - margin; i += xdistance, j += 10)

{

g.DrawLine(blackPen, i, ymiddle, i, (ymiddle) + 5);

g.DrawString(j.ToString() + "%", fnt, blackbrush, i - 7, ymiddle + 3);

}

for (int i = ymiddle, j = 0; i > margin; i -= ydistance, j += (int.Parse(ybig.ToString()) / 10))

{

g.DrawLine(blackPen, margin - 5, i, margin, i);

g.DrawString(j.ToString(), fnt, blackbrush, margin - 30, i - 7);

}

// end guides

Response.ContentType = "image/jpeg";

b.Save(Response.OutputStream, ImageFormat.Jpeg);

b.Dispose();

b2.Dispose();

g.Dispose();

}