using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.Drawing.Text;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

 

public partial class Chart_Default : System.Web.UI.Page

{

Graphics gfx;

Bitmap bmp;

 

protected void Page_Load(object sender, EventArgs e)

{

bmp = new Bitmap(400, 300);

gfx = Graphics.FromImage(bmp);

gfx.Clear(Color.White);

gfx.SmoothingMode = SmoothingMode.AntiAlias;

 

// Define Points

//int[] p = new int[] { 10, 12, 48, 102, 290, 15, 100, 25, 300, 200, 150, 200, 60, 40, 250 };

 

int[] p = generateRandomValues();

 

int[] k = new int[p.Length];

 

Array.Copy(p, k, p.Length);

Array.Sort(k);

 

DrawChart(p, k[k.Length - 1], k[0]);

}

private void DrawChart(int[] points, int maxValue, int minValue)

{

//Offset (Margin) Values

int bottomOffset = 50;

int topOffset = 30;

int leftOffset = 60;

int rightOffset = 10;

 

// Taking care of some bookwork (declaring/initializing variables)

int maxDataPoints = points.Length;

int chartHeight = bmp.Height - bottomOffset;

int chartWidth = bmp.Width - rightOffset;

 

// Adjustable Values

double adjustedMax = maxValue * .10 + maxValue;

double adjustedMin = minValue - .50 * minValue;

double adjustVerticalRatio = (chartHeight-topOffset) / adjustedMax;

double adjustHorizontalRatio = ((chartWidth - leftOffset) / (maxDataPoints - 1));

 

Pen chartPen = new Pen(Color.Orange, 3);

Pen gridLine = new Pen(Color.LightGray, 1);

 

int minYpos = chartHeight - topOffset;

int maxYpos = 10;

 

// Drawing the Lines

for (int i = 0; i < maxDataPoints - 1; i++)

{

int xPos = Convert.ToInt32(i * adjustHorizontalRatio) + leftOffset;

int xPos2 = Convert.ToInt32((i + 1) * adjustHorizontalRatio) + leftOffset;

 

int yPos = Convert.ToInt32(chartHeight - adjustVerticalRatio * points[i]);

int yPos2 = Convert.ToInt32(chartHeight - adjustVerticalRatio * points[i + 1]);

 

if (points[i] == minValue)

{

minYpos = yPos;

}

 

if (points[i] == maxValue)

{

maxYpos = yPos;

}

 

gfx.DrawLine(gridLine, new Point(xPos2, topOffset), new Point(xPos2, chartHeight));

gfx.DrawLine(chartPen, new Point(xPos, yPos), new Point(xPos2, yPos2));

 

gfx.DrawString(i.ToString(), new Font("Arial", 8), new SolidBrush(Color.Gray), new Point(xPos - 4, chartHeight + 10));

}

 

//Draw Border Lines

Pen borderLine = new Pen(Color.DarkGray, 2);

 

//Left Border

gfx.DrawLine(borderLine, new Point(leftOffset, chartHeight), new Point(leftOffset, topOffset));

 

//Bottom Border

gfx.DrawLine(borderLine, new Point(leftOffset, chartHeight), new Point(chartWidth, chartHeight));

 

//Right Border

gfx.DrawLine(borderLine, new Point(chartWidth, chartHeight), new Point(chartWidth, topOffset));

 

//Top Border

gfx.DrawLine(borderLine, new Point(leftOffset, topOffset), new Point(chartWidth, topOffset));

 

//Drawing Vertical Min/Max Values

gfx.DrawString(maxValue.ToString(), new Font("Arial", 8), new SolidBrush(Color.Gray), new Point(leftOffset - 25, maxYpos));

gfx.DrawString(minValue.ToString(), new Font("Arial", 8), new SolidBrush(Color.Gray), new Point(leftOffset - 25, minYpos));

gfx.DrawLine(gridLine, new Point(leftOffset - 25, minYpos), new Point(chartWidth, minYpos));

gfx.DrawLine(gridLine, new Point(leftOffset - 25, maxYpos), new Point(chartWidth, maxYpos));

 

// Title

gfx.DrawString("[ Plotting Random Numbers ]", new Font("Arial", 10, FontStyle.Bold), new SolidBrush(Color.FromArgb(0, 102, 204)), new Point(leftOffset + 60, topOffset-30));

 

//Finalizing and Cleaning Up

Response.ContentType = "image/jpeg";

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

bmp.Dispose();

gfx.Dispose();

Response.End();

}

 

private int[] generateRandomValues()

{

Random rand = new Random();

int numValues = rand.Next(10, 20);

 

int[] newArray = new int[numValues];

 

for (int i = 0; i < numValues; i++)

{

newArray[i] = rand.Next(100, 1000);

}

return newArray;

}

}