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The transparency of pixels doesn t have to be all or nothing. You can also set the transparency value, for example, to 70 percent. In the example of a car driving over your grass, you could set the gray windows of your car to 70 percent transparency. This way, when you render your car over the grass, the final color of the windows will be 30 percent gray and 70 percent the color of the grass behind it. You can find more information on this in recipe 2-12. This is called alpha blending.

Figure 19-1. Generic types are templates for types. C# provides five kinds of generics: classes, structs, interfaces, delegates, and methods. Notice that the first four are types, and methods are members. Figure 19-2 shows how generic types fit in with the other types covered.

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Next, create a file named contacts.py in the browser folder, containing the following code: from Products.Five import BrowserView from zope.component import getUtility from collective.lead.interfaces import IDatabase from plonebook.contacts.database import Contacts class ContactsView(BrowserView): def getContacts(self): db = getUtility(IDatabase, name='plonebook.db') contacts = db.session.query(Contacts).list() return contacts Also create a contacts.pt file to ask the view class to provide the contact data, and then copy into it the contacts_board template we used in the previous section. Then make the following single-line modification: ... <ul tal:define="contacts view/getContacts"> ... </ul> ... Next, to register the browser view, create a configure.zcml named file in the browser directory, containing the following lines: <configure xmlns:zope="http://namespaces.zope.org/zope" xmlns="http://namespaces.zope.org/browser" > <page name="contacts" for="*" class=".contacts.ContactsView" template="contacts.pt" permission="zope2.Public" /> </configure> Finally, update the configure.zcml file in the package root to include the browser package, adding the following line: ... <include package=".browser" /> ...

By default, alpha blending is enabled when drawing with the SpriteBatch class. However, you can turn off alpha blending (try this to see the difference!) or set the mode to Additive blending. In the latter case, every color you render to a pixel is added to the color that was already present in that pixel. So using this mode, if you draw a blue pixel over a red pixel, you get a purple pixel. If you draw a green rectangle over this purple pixel, you get a green rectangle containing a white pixel. This mode is used for effects such as fire or explosions, which are composed of many sprites and are additively blended, as you can read in recipe 3-12. XNA allows you to set the blending mode of the SpriteBatch class as an argument in the SpriteBatch.Begin method, where you specify one of these SpriteBlendMode states: SpriteBlendMode.None turns off the blending and will render the image to the screen neglecting any transparency information it carries and thus overwriting any images already present in deeper layers. SpriteBlendMode.AlphaBlend uses a portion of the existing color and a portion of the color contained in the new image, corresponding to the alpha value specified in the image. This corresponds to the example on the car windows. SpriteBlendMode.Additive adds the color of the new image to the color already present in the frame buffer.

The standard arithmetic and comparison operators have been updated to handle nullable types. There is also a new operator called the null coalescing operator, which allows you to return a value to an expression, in case a nullable type variable is null. The null coalescing operator consists of two contiguous question marks and has two operands: The first operand is a variable of a nullable type. The second is a non-nullable value of the same underlying type. If, at run time, the first operand evaluates as null, the second operand is returned as the result of the operation. Null coalescing operator int MyI4 = null; Console.WriteLine("MyI4: {0}", MyI4 -1); MyI4 = 10; Console.WriteLine("MyI4: {0}", MyI4 -1); This code produces the following output: MyI4: -1 MyI4: 10 The equality comparison operators, == and !=, have an interesting characteristic you need to be aware of. If you compare two values of the same nullable type, and both are null, the equality comparison operators consider them equal. For example, in the following code the two nullable ints are set to null. The equality comparison operator will declare them equal. int I1 = null, I2 = null; if (I1 == I2) Console.WriteLine("Equal"); // Both are null. // Operator returns true.

When using the SpriteBatch class incorrectly, your application will run terribly slowly if you want to render a large amount of images.

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