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Listing 6-2. Generating Images Containing Text in Custom Fonts Using C# namespace { using using using using CustomImage System; System.Drawing; System.Drawing.Text; System.Web;

1. This includes Unix-like systems like Linux and BSD. I will refer to these generically, if not entirely accurately, as Unix in this chapter. 2. I discuss plug-in development in 10. 143

public class GenerateImage: System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { // Extract the text we wish to display from the query string // parameter text. string text = Request.QueryString["text"]; // Define variables for the other information we need to represent our // font: the font file location, its size, color, and background color // of the canvas we wish to display the text on top of. string fontFileLocation = "font-file-location.ttf"; int size = 24; Color color = Color.Black; Color backgroundColor = Color.White; // // // // // // // // // Next, we create a new Bitmap object, which represents the empty canvas within which we will place our text. We start with a catch-22 situation, however, as we want to create a canvas as large as the text we wish to represent, but unfortunately we can't measure the dimensions of the text without having a canvas to put the text on. The way we overcome this hurdle is by starting off with a dummy canvas, measuring 1 pixel by 1 pixel in size, which we will use as the basis for our text measurements and then replace with the real canvas later.

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3/16/06

Figure 2-12. Ogre GLX configuration dialog Select the OpenGL rendering system, and you should see a dialog like Figure 2-13.

Before looking at how to monitor particular services and metrics, let s briefly discuss how commands and plug-ins work. Some of this information I ve already covered in 2, but I ll refresh your memory here. Commands can be used to monitor both hosts and services. Commands are defined using command objects and then referenced using the check_command directive in host and service object definitions.

Bitmap canvas = new Bitmap(1, 1); // // // // Within ASP.NET, the Graphics class contains the methods we need to draw and measure text that sits on the canvas. The first step before using these methods is to declare an instance of the object and associate it with our canvas.

minimal.cfg and bigger.cfg) sample configuration files that come with Nagios. Some of these com-

Figure 2-13. Ogre GLX options Set the options to your liking, and when you click Accept, the demo will begin. This configuration dialog saves its settings so that subsequent execution of other demos will preset this dialog with your settings.

Graphics graphics = Graphics.FromImage(canvas); // Before writing any text, we need to define our font. ASP.NET defines // two types of font collections: the fonts installed on the system and // a private collection of fonts that can be loaded dynamically

mands may not be functional since the sample files are not always updated when the plug-ins are, but they should provide an excellent basis for creating commands.

While Ogre is equally supported on both Windows and Linux platforms, Windows users have the added advantage that Windows and Visual C++ is the main development environment for Ogre. Building Ogre from source on Windows is actually easier than building it on Linux.

As I discussed in 2, typically we only want to monitor hosts when absolutely required. This is because if services are responding to checks, then Nagios assumes the host is available. If Nagios does need to check the host, it generally uses some type of network ping to check if the host is up. Example 5-1 shows the command check-host-alive, which is the default command used in the host object check_command directives in the sample configuration files. Example 5-1. The Sample Host Check Command define command{ command_name command_line -c 5000.0,100% -p 1 }

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