Cameras and Game Controls - jMonkeyEngine 3.0 - page 69

How to do it...
To attach an input AppState object, perform the following steps:
1. Start off by creating a class called InputAppState , extending AbstractAp-
pState , and implementing ActionListener and AnalogListener .
2. The InputAppState class needs a couple of fields to be functional. First of all,
we're going to keep a reference to the application's InputManager in a field
called inputManager . We're also adding a GameCharacterControl field
called character . This can be replaced by any spatial . Lastly, we're going to
have a value that controls the sensitivity of the analog controls. We do this with a
float called sensitivity. Add getters and setters for character and sensitivity.
3. Next, we'll set up the kinds of input we're going to handle. Strings are used by
jMonkeyEngine for the mappings, but enums can be easier to manage across
classes. Here, we'll use an enum and supply the name of the value as the mapping.
We use it to create some basic FPS controls as follows:
public enum InputMapping{
RotateLeft, RotateRight, LookUp, LookDown,
StrafeLeft,
StrafeRight, MoveForward, MoveBackward;
}
4. We create a method called addInputMappings to add these to inputMan-
ager and make sure it listens to them. To do this, we supply the name of the
enum value as the mapping and bind it to a certain input as follows:
private void addInputMappings(){
inputManager.addMapping(InputMapping.RotateLeft.name(),
new MouseAxisTrigger(MouseInput.AXIS_X, true));
inputManager.addMapping(InputMapping.RotateRight.name(),
new MouseAxisTrigger(MouseInput.AXIS_X, false));
inputManager.addMapping(InputMapping.LookUp.name(),
new MouseAxisTrigger(MouseInput.AXIS_Y, false));
inputManager.addMapping(InputMapping.LookDown.name(),
new MouseAxisTrigger(MouseInput.AXIS_Y, true));