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For free movement, click the object, hold down the button, and drag the cursor a little way to release the object from its current position (see Figure 6-11). (This takes a little practice to get right without making Blender s pop-up menu appear. A thin line is drawn on the object as you perform this action, but it s only temporary and doesn t appear on the 3D model.) Alternatively, press the keyboard shortcut G to grab the object. You can then position it up and down, or left and right in front of the camera but notice that its size doesn t change with perspective. To use this method to move an object further away from or nearer to the camera, switch to Top view first.

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This first point is thus, perhaps, a consequence of (as I put it earlier) trying to formalize preexisting notions, instead of attempting to define a brand new model Next, S is allowed to have more values than T does! Here s a quote (slightly simplified): Consider pairs and triples Pairs have methods that fetch the first and second elements; triples have these methods plus an additional one to fetch the third element Triple is a subtype of pair [my italics] Comment: What Is this another consequence of trying to formalize preexisting notions Surely, to say that S is a subtype of T is to say that every value of type S is a value of type T (ie, the set of S values is a subset of the set of T values).

In addition to the new standard assertions such as Assert.assertEquals or Assert.assertFalse, FlexUnit 4 supports new methods thanks to Hamcrest (http://github.com/drewbourne/hamcrestas3/tree/master). Hamcrest is a library that is based on the idea of matchers. Each matcher can be set to match conditions for your assertions. Create a new test case and call it FlexUnitCheckRangeTester.

16 Thus, to say that triple is a subtype of pair is to say that every triple is a pair, or equivalently that triples are a special case of pairs! Now, in our own inheritance model, we do take it as axiomatic that there can t be more values of type S than there are of type T (and we find this apparently trivial observation a great aid to clear thinking in this potentially confusing area) Furthermore, it seems to me that Liskov and Wing s rejection of this axiom constitutes in itself a violation of their own Subtype Requirement ! For example, consider a method that, given an arbitrary object of some specific type T, returns the cardinality ie, the number of distinct values of that type T That method will clearly give different answers depending on whether it s invoked on a pair or a triple.

package flexUnitTests { import org.hamcrest.AbstractMatcherTestCase; import org.hamcrest.number.between; public class FlexUnitCheckRangeTester extends AbstractMatcherTestCase

Figure 6-11. Free movement is possible without the 3D Transform Manipulator tool, albeit in two dimensions only. You can also use this tool for free rotation by making a circular motion with the mouse as you hold down the left button and drag. The keyboard shortcut for rotation is R, as you may have guessed. A dotted line rotation handle appears; drag it toward the object to make large rotations quickly, or extend the handle away from the object to make more subtle adjustments (see Figure 6-12). The center of the rotation is shown by a pink blob on the end of the dotted handle.

a destination. Then, in the section Extending data services for advanced remoting use cases, you will see how to use custom extensions as destinations. In data services, almost all server-side elements that facilitate remoting and messaging are configured as destinations. HTTPService and WebService, when routed through a data service proxy, also map to a destination. When you interact with a server-side service via a destination, you use a messaging channel to communicate back and forth A messaging channel is a bundle that defines a protocol and an endpoint set. An endpoint set means a URI, a listening port number, and an endpoint type definition. For example, an AMF channel could be established with the help of the AMF channel implementation class (mx.messaging.channels.AMFChannel) and an endpoint definition, which could be a combination of an endpoint type (flex.messaging.endpoints.AmfEndpoint) and its availability via a URI (say /sampleapp/messagebroker/amf) over a certain listening port (which by default for AMF is 8100). Sometimes, services need special adapters to communicate with server-side elements. These adapters may translate the message and act as the classical conduit that helps different programming interfaces communicate and interact with each other. (An adapter by definition is something that modifies an API to make it adapt to the required integration scenario.) Data services define a set of built-in adapters and provide an API to create your own. That is enough theory; time now to roll our sleeves up and see data services in action. We first install data services and then quickly create a small example application to see how it works.