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The record cache isn t a buffer for just any record. Rather, the record cache is really just a set of function calls that mostly read or write data sequentially from a collection of files. For this reason, the record cache is used primarily during table scan operations. However, because of its ability to both read and write data, the record cache is also used for sequential writing, such as in some log writing operations. The core implementation of the record cache can be found in /mysys/io_cache.c and /sql/records.cc; however, you ll need to do some digging around before anything makes much sense. This is because the key struct used in the record cache is called st_io_cache, aliased as IO_CACHE. This structure can be found in /mysys/my_sys.h, along with some very important macros, all named starting with my_b_. They are defined immediately after the IO_CACHE structure, and these macros are one of the most interesting implementation details in MySQL.

Figure 13-9. Moving the listener between sources The cow source repeatedly moos at (10, 0, 0), and the listener starts at the same spot. It then travels incrementally along the x-axis toward (-10, 0, 0) where an ocean source is playing. The mooing will initially be the loudest sound coming from the speakers, but will slowly fade away, being replaced by the increasingly louder ocean. The orientation of the listener means that both ears receive the same amount of sound, so the fade-out of the cow and fade-in of the ocean are the same for both speakers.

The easiest but least flexible mechanism for detecting whether a sprite has been touched is to see whether the sprite s bounding box contains the touch point. This can be achieved as shown in Listing 4 6. Listing 4 6. A simple hit test using the bounding box bool IsPointInObject (Vector2 point) { Rectangle bbox; // Retrieve the bounding box bbox = BoundingBox; // See whether the box contains the point return bbox.Contains((int)point.X, (int)point.Y); } The Rectangle structure conveniently performs this check for us, though it is really just a simple matter of checking that the x coordinate falls between the rectangle s left and right edges, and that the y coordinate falls between the top and bottom edges. As the BoundingBox property already takes notice of scaling and custom sprite origins, this is all that we need to do for this simple check. If we need to be able to work with rotated rectangles, though, we need something a little more sophisticated

The IO_CACHE structure is essentially a structure containing a built-in buffer, which can be filled with record data structures9 However, this buffer is a fixed size, and so it can store only so many records Functions throughout the MySQL system can use an IO_CACHE object to retrieve the data they need, using the my_b_ functions (like my_b_read(), which reads from the IO_CACHE internal buffer of records) But there s a problem What happens when somebody wants the next record, and IO_CACHE s buffer is full Does the calling program or function need to switch from using the IO_CACHE s buffer to something else that can read the needed records from disk No, the caller of my_b_read() does not.

There are various ways that we could test a point within a rotated rectangle. The easiest to conceptualize is taking the four corners of the rectangle and seeing whether the point falls inside them. However, there are simpler and more efficient ways to achieve this in code. A more efficient way to achieve this is to imagine that we have rotated the rectangle back around its origin until its angle is zero, and correspondingly rotate the test point by the same angle. Once we have done this, we can simply perform a simple aligned rectangle check, just as we did in Listing 4 6. In Figure 4 2, two images are shown of some test points and a rectangle. The rectangle has been scaled so that it is longer along its x axis, and rotated by about 15 degrees. Looking at Figure 4 2(a), it is obvious visually that test point 1 is within the rectangle, and test point 2 is not. In order for our code to determine this, we imagine rotating the sprite back until its angle is 0, and we rotate the two points by exactly the same amount. Of course, we don t actually draw it like this or even update the sprite s properties; we just perform the calculations that would be required for this rotation. If we were to draw the rotation, we would end up with the arrangement shown in Figure 4 2(b). (a) Rectangle origin (b)