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This function is now called whenever the info struct in sub_select() calls its read_record() member method. It, in turn, calls another MyISAM handler method, rnd_next(), which simply moves the current record pointer into the needed READ_RECORD struct. Behind the scenes, rnd_next simply maps to the mi_scan() function implemented in the same file we saw earlier, as shown in Listing 4-27. Listing 4-27. /myisam/mi_scan.c mi_scan() int mi_scan(MI_INFO *info, byte *buf) { // info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED); DBUG_RETURN ((*info->s->read_rnd)(info,buf,info->nextpos,1)); } In this way, the record cache acts more like a wrapper library to the handlers than it does a cache. But what we ve left out of the preceding code is much of the implementation of the shared IO_CACHE object, which we touched on in the section on caching earlier in this chapter. You should go back to records.cc and take a look at the record cache implementation now that you know a little more about how the handler subclasses interact with the main parsing and execution system. This advice applies for just about any of the sections we covered in this chapter. Feel free to go through this code execution over and over again, even branching out to discover, for instance, how an INSERT command is actually executed in the storage engine.

The z-axis position can be either FPSGlove.NEAR, FPSGlove.FAR, or FPSGlove.MIDDLE. The first two make the camera move forward or backward: // globals private static final double MOVE_STEP = 0.2; // hardwired movement vectors private static final Vector3d FWD = new Vector3d(0,0,-MOVE_STEP); private static final Vector3d BACK = new Vector3d(0,0,MOVE_STEP);

Figure 4 10 The long and the short way to rotate across the 0 degree boundary To prevent this from happening, we will check to see whether the target angle is more than 180 degrees away from the current spaceship angle If it is over 180 degrees above the spaceship angle, we subtract 360 from the target angle so that the spaceship rotates the other way (which will be less than 180 degrees and is thus the shorter angle) If it is over 180 degrees below the spaceship angle, we do the reverse and add 360 degrees to the target angle These will ensure that we always take the short route to the desired angle It might also result in a target angle that is above 360 degrees or below 0 degrees, however.

Summary

This itself doesn t cause any problems, but is the reason we ensure that the Angle value is between 0 and 2 PI back in Listing 4 32 Listing 4 34 shows the remainder of the RotateToFacePoint function Once the target angle has been calculated as described, it is converted back to radians and stored in the class-level _targetAngle variable Listing 4 34 Ensuring that the rotation always takes the short route, and storing the target angle ready for use // Is the target angle over 180 degrees less than the current angle if (targetAngleDegrees < angleDegrees - 180) { // Yes, so instead of rotating the whole way around to the left, // rotate the smaller distance to the right instead.

private void translate() { int handPos = glove.getZPosition(); switch(handPos) { case FPSGlove.NEAR: doMove(FWD); break; case FPSGlove.FAR: doMove(BACK); break; case FPSGlove.MIDDLE: break; // do nothing default: System.out.println("pos "); break; } } // end of translate()