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Voronoi regions are especially helpful in efficiently detecting collisions between circles and polygons, like rectangles and triangles. They allow you to apply a different collision strategy depending on the region where the object resides. We ll be taking a closer look at how to calculate them in 4. For now, it s enough that our line-versus-particle code from the previous chapter already does the job of finding out which region the circle occupies. Let s do a quick review of those concepts. First, the code knows whether the object is on the left side or right side of the line. In the example code that we ve been using, v2 is a vector that represents the collision plane. Another vector called v3 runs from the end of the spoke (v0) to the start of the collision plane, as shown in Figure 3-15.

12. The code for the SaveSecurityCacheItem method and its overload differ from the other save methods in that they do not call the GetSecurityCacheItem method to save their data. The second version of the method actually calls the cache manager directly. Copy the code in Listing 11-12 into the class to implement this functionality.

The Infinite Data pattern is used to send tasks to be executed and receive results from executed tasks. The basis of the Infinite Data pattern is the Persistent Communications pattern. The

Figure 3-15. A vector called v3 runs between the end of the spoke and the start of the collision plane. The dot product between v3 and v2.ln tells you on which side of the collision plane the end of the spoke is located. If the dot product between v3 and v2 s left normal (v2.ln) is greater than zero, then the end of the spoke is on the left side of the collision plane. If the dot product is less than zero, then the end of the spoke is on the right side. Figure 3-16 illustrates how this works. This is the same basic collision code that we covered in 2.

Listing 11-12. Adding the SaveSecurityCacheItem Methods public IToken SaveSecurityCacheItem(SecurityCacheItem item) { IToken token = new GuidToken(); SaveSecurityCacheItem(item, token); return token; } public void SaveSecurityCacheItem( SecurityCacheItem item, IToken token) { SecurityCacheItem cacheItem = null; cacheItem = securityCacheManager.GetData(token.Value) as SecurityCacheItem; if (cacheItem == null) { securityCacheManager.Add(token.Value, item, CacheItemPriority.Normal, null, GetCacheExpirations()); } else { cacheItem.Identity = item.Identity; cacheItem.Principal = item.Principal; cacheItem.Profile = item.Profile; } } Compile the code and copy the new assembly to the bin directory of the Enterprise Library installation. Create a reference to the new assembly from the demo application.

Figure 3-16. Use the dot product between v3 and v2.ln to find out on which side of the collision plane the circle is located. The code also knows whether the object is beyond the start and end point of the collision plane. This is also worth a quick review.

Persistent Communications pattern is used because it is able to receive data asynchronously, which is a fundamental aspect of the Infinite Data pattern. The Infinite Data pattern is not related to any operations that define the basis of an HTML page. The Infinite Data pattern is not intended to be used as a replacement for the Content Chunking pattern, because the HTML content retrieved by the Content Chunking pattern is not processed. It is inserted into the HTML page. The results retrieved from the Infinite Data pattern are processed and transformed into content that is added to an HTML page.

The code calculates another dot product, between v3 and v2. If this dot product is greater than zero, then the end of the spoke is beyond the collision plane s start point. If this dot product is greater than v2 s negative magnitude (-v2.m), then it s beyond the collision plane s end point. Figure 3-17 illustrates these concepts.

The hardest part is complete, and now it is time to configure the new security cache provider. The unfortunate part about creating a custom provider is that the easiest implementation requires that any properties be added as attributes. Since the sample security cache provider uses the same cache manager as the default caching store provider, you will need to add attributes to the configuration. The few steps listed here will set up the DemoSecurityCacheProvider class to be used with the cache manager that was configured earlier in the chapter.

Figure 3-17. Use the dot product between v3 and v2 to find out whether the circle is beyond the collision plane s start and end points. The flip side of this is that you can tell whether the circle is within the collision plane s start and end points This will be true if the dot product is greater than v2.m and less than zero, as illustrated in Figure 3-18. The code that checks for this in the examples looks like this: dp1 > -_v2.m && dp1 < 0