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The storage engine handler subclasses must implement a base interface API defined in the handler superclass. This API is how the server interacts with the storage engine. Listing 4-1 shows a stripped-out version (for brevity) of the handler class definition. Its member methods are the API of which we speak. We ve highlighted the member method names to make it easier for you to pick them out. Out intention here is to give you a feel for the base class of each storage engine s implementation.

public void turnListener(int degrees) // turn the listener anticlockwise by the amount stored in degrees { setListenerOri( angleLis+degrees ); }

The Tap gesture fires when you briefly touch and release the screen without moving the touch point. The DoubleTap gesture fires when you quickly touch, release, and then touch the screen again without any movement taking place. If both of these gestures are enabled, a Tap and DoubleTap gesture will be reported in quick succession. Note that repeat rapid taps of the screen are not quite as responsive through the Gestures API as they are by reading the raw touch information. If you need to be very responsive to lots of individual screen taps, you might find raw touch data more appropriate.

Listing 4-1. handler Class Definition (Abridged) class handler // { protected: struct st_table *table;

public void setListenerOri(int ang) /* Set the listener's orientation to be ang degrees in the anticlockwise direction around the y-axis. */ { angleLis = ang; double angle = Math.toRadians(angleLis); float xLen = -1.0f * (float) Math.sin(angle); float zLen = -1.0f * (float) Math.cos(angle); /* face in the (xLen, zLen) direction by adding the values to the listener position */ oriLis[0] = xLis+xLen; oriLis[2] = zLis+zLen; al.alListenerfv(AL.AL_ORIENTATION, oriLis, 0); } // end of setListenerOri() angleLis is a global storing the listener s total rotation away from its starting direction along the negative z-axis. The user supplies an angle change which is added to angleLis. turnListener() rotates the listener by the specified number of degrees from its current orientation, while setListenerOri() measures the angle from the listener s initial position. These methods allow the listener to rotate in two ways, either relative to its current orientation, or from its initial position.

The Hold gesture fires after stationary contact has been maintained for a brief period of time (about a second). If the touch point moves too far from the initial contact position, the hold gesture will not fire. This means that, although it is quite possible for a Hold to fire after a Tap or DoubleTap, it is less likely after one of the drag gestures.

/* The table definition */

The three drag gestures can be used independently or together, though using FreeDrag at the same time as one of the axis-aligned drags can be awkward because once XNA has decided the direction of movement, it doesn t change. Beginning a horizontal drag and then moving vertically will continue to be reported as a horizontal drag. For this reason, it is generally better to stick to either axis-aligned drags or free drags, but not mix the two. In addition to reporting the position within the returned GestureSample object, XNA also returns the Delta of the movement the distance that the touch point has moved on the x and y axes since the last measurement. This can be useful if you want to scroll objects on the screen because it is generally more useful than the actual touch position itself. For VerticalDrag and HorizontalDrag, only the relevant axis value of the Delta structure will be populated; the other axis value will always contain 0. Once a drag has started, it will continually report the touch position each time it moves. Unlike when reading raw input, no gesture data will be added to the queue if the touch point is stationary. When the touch point is released and the drag terminates, a DragComplete gesture type will be reported.

In the rest of this chapter, I go through several small examples showing how JOALSoundMan can move a source and translate and rotate the listener. None of these use 3D (or 2D) graphics, although the last one utilizes a simple GUI. I also use JOALSoundMan in a Java 3D example in the next chapter, and with JOGL in 17.