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Next, the drawing code adds a title to the chart, as shown here: .. // Write some text to the image gDrawString("Sample Chart", new Font("Verdana", 18, FontStyleBold), BrushesBlack, new PointF(5, 5)); .. The next step is to calculate the total of all the data points, as follows This allows you to size each slice proportionately in the pie .. // Calculate the total of all data values float total = 0; foreach (PieSlice item in chartData) { total += itemDataValue; } .. Once you know the total, you can calculate the percentage of the pie that each slice occupies Finally, you can multiply this percentage by the total angle width of a circle (360 degrees) to find the angle width required for that slice To draw each slice, you can use the GraphicsFillPie() method and specify the starting and ending angle.

Once imported, this module provides one class intended as the base class for subclasses based on the framework. Any remaining classes are intended to be used as attributes of the new subclass. Together, these objects will combine to control how the new class will work.

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When you draw each slice, you also need to ensure that you choose a new color that hasn t been used for a previous slice This task is handled by a GetColor() helper method, which chooses the color from a short list based on the slice s index number: .. // Draw the pie slices float currentAngle = 0, totalAngle = 0; int i = 0; foreach (PieSlice item in chartData) { currentAngle = itemDataValue / total * 360; gFillPie(new SolidBrush(GetColor(i)), 10, 40, 150, 150, (float)MathRound(totalAngle), (float)MathRound(currentAngle)); totalAngle += currentAngle; i++; } .. The last drawing step is to render the legend To create the legend, you need a rectangle that shows the slice color, followed by the pie slice label Once again, the GetColor() method returns the correct color for the slice: .. // Create a legend for the chart.

PointF colorBoxPoint = new PointF(200, 83); PointF textPoint = new PointF(222, 80); i = 0; foreach (PieSlice item in chartData) {.

The User object represents information about the user making the request of the web server, and it allows you to test that user s role membership.

Expressions are deemed to be true or false by the test command or one of two nonstandard shell reserved words, [[ and ((. The test command compares strings, integers, and various file attributes; (( tests arithmetic expressions, and [[ ... ]] does the same as test with the additional feature of comparing regular expressions.

The User object always implements System.Security.Principal.IPrincipal. The specific class depends on the type of authentication you re using. For example, you can authenticate a user based on Windows account information using IIS or through cookie-based authentication with a dedicated login page. However, it s important to realize that the User object provides useful information only if your web application is performing some sort of authentication that restricts anonymous users. Part 4 of this book deals with security in detail.

Each feature starts with at least one base class. There may be more, depending on the needs of the framework, but at least one will always be required in order to make this syntax possible. Without it, every class you ask your users to define will have to include a attribute explicitly, which is an implementation detail most users shouldn t need to know about.

The Trace object is a general-purpose tracing tool (and an instance of the System.Web.TraceContext class). It allows you to write information to a log that is scoped at the page level. This log has detailed timing information so that not only can you use the Trace object for debugging but you can also use it for performance monitoring and timing. Additionally, the trace log also shows a compilation of miscellaneous information, grouped into several sections. Table 3-5 describes all the information you ll see. Table 3-5. Trace Log Information

This section includes some basic information about the request context, including the current session ID, the time the web request was made, and the type of web request and encoding This section shows the different stages of processing the page went through before being sent to the client Each section has additional information about how long it took to complete, as a measure from the start of the first stage (From First) and as a measure from the start of the previous stage (From Last) If you add your own trace messages (a technique described shortly), they will also appear in this section The control tree shows you all the controls on the page, indented to show their hierarchy, similar to the control tree example earlier in this chapter.

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