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Listing 4-19. /sql/sql_select.cc do_select() static int do_select(JOIN *join,List<Item> *fields,TABLE \ *table,Procedure *procedure) { JOIN_TAB *join_tab; sub_select(join,join_tab,0); join->result->send_eof()) } This looks a little more promising. We see that join object s result member variable sends an end-of-file (EOF) marker after a call to another function called sub_select(), so we must be getting closer. From this behavior, it looks as though the sub_select() function should fill the result member variable of the join object with some records. Let s see whether we re right, in Listing 4-20. Listing 4-20. /sql/sql_select.cc sub_select () static int sub_select(JOIN *join,JOIN_TAB *join_tab,bool end_of_records) { join_init_read_record(join_tab); READ_RECORD *info= &join_tab->read_record; join->thd->row_count= 0; do { join->examined_rows++; join->thd->row_count++; } while (info->read_record(info))); } return 0; } The key to the sub_select()16 function is the do while loop, which loops until a READ_RECORD struct variable (info) finishes calling its read_record() member method. Do you remember the record cache we covered earlier in this chapter Does the read_record() function look familiar You ll find out in a minute.

To rotate to face a particular angle, we need to use some trigonometry For those of you not of a mathematical persuasion, don t panic! This really isn t too complicated, thanks in part to some of the functionality provided by XNA In order to rotate to a point, we first need to find the distance of the point from the spaceship s own position We have a Vector2 for the spaceship and another for the touch point, so to find the distance we can simply subtract the spaceship position from the touch point This is the first thing that the RotateToFacePoint function does, the beginning of which is shown in Listing 4 31.

Note The READ_RECORD struct is defined in /sql/structs.h. It represents a record in the MySQL internal format.

Figure 14-10. The HandView3D application The 3D scene is a familiar one: a checkerboard floor, a background, and lights. The cow is new, as is the music, spatially located under the cow and playing repeatedly. The user can travel through the scene by moving his or her glove forward, backward, left, and right. As the camera s position changes in relation to the cow, the music varies in intensity and the speaker mix is adjusted. If the music lover clenches his fist, the music is paused until he clenches it again. The music can also be toggled on and off by pressing the A button on the glove. Figure 14-2 shows the user navigating around the scene. Figure 14-11 gives the class diagrams for HandView3D, showing only the public methods.

If it finds that the touch point is exactly the same as the spaceship position, it returns without doing anything because there is no real way to know which direction we should turn toward in order to look exactly at ourselves Listing 4 31 Finding the direction of the touch point relative to the spaceship position private void RotateToFacePoint(Vector2 point) { // Find the angle between the spaceship and the specified point // First find the position of the point relative to the position of the spaceship point -= Position; // If the point is exactly on the spaceship, ignore the touch if (point == Vector2Zero) return; Now we are ready to find the angle toward which we need to face Before doing this, the code ensures that the current sprite Angle property is greater or equal to 0 radians, and less than 2 PI radians (360 degrees).

16. We ve admittedly taken a few liberties in describing the sub_select() function here. The real sub_select() function is quite a bit more complicated than this. Some very advanced and complex C++ paradigms, such as recursion through function pointers, are used in the real sub_select() function. Additionally, we removed much of the logic involved in the JOIN operations, since, in our example, this wasn t needed. In short, we kept it simple, but the concept of the function is still the same.