/// <summary>
/// Handles the Load event of the Page control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="T:System.EventArgs"/> instance containing the event data.</param>
private void Page_Load(object sender, EventArgs e)
{
// This is a quick check for referrer server name against host server
// For best security practice in a deployed application, an authenticating mechanism should be in placed.
// Image should only be rendered for authenticated users only.
// set return type to png image format
Response.ContentType = "image/png";
string xValues, yValues, chartType, print;
bool boolPrint;
// Get input parameters from query string
chartType = Request.QueryString["chartType"];
xValues = Request.QueryString["xValues"];
yValues = Request.QueryString["yValues"];
print = Request.QueryString["Print"];
if (chartType == null)
{
chartType = string.Empty;
}
// check for printing option
if (print == null)
{
boolPrint = false;
}
else
{
try
{
boolPrint = Convert.ToBoolean(print);
}
catch
{
boolPrint = false;
}
}
if (xValues != null && yValues != null)
{
Color bgColor;
if (boolPrint)
{
bgColor = Color.White;
}
else
{
bgColor = Color.White;
}
Bitmap StockBitMap;
MemoryStream memStream = new MemoryStream();
switch (chartType)
{
case "bar":
BarGraph bar = new BarGraph(bgColor);
bar.VerticalLabel = string.Empty;
bar.VerticalTickCount = 5;
bar.ShowLegend = false;
bar.ShowData = false;
bar.Height = 400;
bar.Width = 700;
bar.CollectDataPoints(xValues.Split("|".ToCharArray()), yValues.Split("|".ToCharArray()));
StockBitMap = bar.Draw();
break;
default:
PieChart pc = new PieChart(bgColor);
pc.CollectDataPoints(xValues.Split("|".ToCharArray()), yValues.Split("|".ToCharArray()));
StockBitMap = pc.Draw();
break;
}
// Render BitMap Stream Back To Client
StockBitMap.Save(memStream, ImageFormat.Png);
memStream.WriteTo(Response.OutputStream);
}
}