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You ll represent the camera s frustum using XNA s BoundingFrustum class. XNA has some classes to represent volume, each of which has collision test methods. This allows you to quickly check for intersection between two objects of these classes. Specific to the camera frustum, these collision checks allow you to check whether an object is in sight of the camera. The bounding volumes available in the XNA Framework are the BoundingBox (an axis-aligned box), BoundingSphere, and BoundingFrustum classes. To make sure the collision tests are as accurate as possible, you should use the class that most closely resembles the actual 3D object it represents. For the camera s frustum, use the BoundingFrustum class. To represent an entire person, use a BoundingBox. Use a BoundingSphere only if you want to detect collisions on a person s hand or head. So, using the XNA BoundingFrustum class, you already have methods to check whether objects are inside the frustum, which will tell you whether they are inside or outside the sight of the camera. You ll create the UpdateFrustum method to generate the camera s frustum, and the Frustum property to retrieve it. Here, you ll generate the camera s frustum by combining the camera s view and projection matrices and using it to construct a new XNA BoundingFrustum. As described earlier, the camera is defined by the view matrix (position and orientation) and the projection matrix (shape of the camera frustum), which is why both matrices are needed when you create the BoundingFrustum. You can use the following code to build the camera s frustum: public BoundingFrustum Frustum { get { if (needUpdateProjection) UpdateProjection(); if (needUpdateView) UpdateView(); if (needUpdateFrustum) UpdateFrustum(); return frustum; } } protected virtual void UpdateFrustum() { frustum = new BoundingFrustum(viewMatrix * projectionMatrix); needUpdateFrustum = false; }

A different way of creating Xen images is to use the Xen-tools option This solution consists of two elements: the xen-create-image command and the xen-toolsconf configuration file You can use xen-create-imag with lots of command-line options, but an easier solution is to tell it to read the configuration file /etc/xen-tools/xen-toolsconf Your result is a Xen virtual machine configuration file, just like the one you created manually based on the information from the preceding section In this section, you ll read how to install a Xen virtual machine using Xen tools Before you start building this solution, think carefully about where you want to manage settings The xen-toolsconf file functions as a template file that contains default settings, but these settings can also be specified as command-line options using xen-create-image In this section, I ll show you how to apply both solutions 1 Open the /etc/xen-tools/xen-tools.

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Listing 5-17. Validating a Node Explicitly private void button2_Click(object sender, EventArgs e) { XmlNode node = doc.SelectSingleNode("//employee[@employeeid='" + comboBox1.SelectedItem + "']"); if (node != null) { node.ChildNodes[0].InnerText = textBox1.Text; node.ChildNodes[1].InnerText = textBox2.Text; node.ChildNodes[2].InnerText = textBox3.Text; XmlCDataSection notes = doc.CreateCDataSection(textBox4.Text); node.ChildNodes[3].ReplaceChild(notes, node.ChildNodes[3].ChildNodes[0]); } doc.Validate(OnValidationError,node); if (!isError) { doc.Save(Application.StartupPath + "/employees.xml"); } } Note the code marked in bold. The Validate() method of XmlDocument can validate the entire document or just a node against a previously specified schema or DTD. The Validate() method accepts two parameters: the name of a function that matches the ValidationEventHandler delegate signature and the XmlNode to validate. There is one more overload of Validate() that takes just a function matching the ValidationEventHandler delegate signature and validates the entire document. The OnValidationError function is shown in Listing 5-18. Listing 5-18. The OnValidationError Function void OnValidationError(object sender, ValidationEventArgs e) { MessageBox.Show(e.Message); isError = true; } The function simply shows the error message in a message box and sets a class-level Boolean variable isError to true. This variable is checked to decide whether to save the document. To test the application, modify the phone number of any employee to more than 20 characters and click the Update button. You should see a message box similar to the one shown in Figure 5-19.

conf file with an editor and include the following settings: dir = /home/xen # directory where the virtual disk files are created install-method = debootstrap # specifies how to boot the virtual machine dist = etch # specifies what distribution to install, check the configuration file for information about supported distributions dhcp = 1 # use this to set up networking via DHCP passwd = 1 # you need this to set the root password interactively kernel = /boot/vmlinuz-`uname -r` # the kernel to use initrd = /boot/initrdimg-`uname -r` # the initrd to use boot = 1 # this allows the new virtual machine to boot after installation mirror = http://dearchiveubuntucom/ubuntu/ # the mirror site to perform the installation 2 Now that some of the basic settings for installing the virtual machine are in place, use the xen-create-image command to create the virtual machine.

CHAPTER 10 LIGHTS, CAMERA, TRANSFORMATIONS!

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