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33 package com.jme.input.action;
35 import com.jme.math.Vector3f;
36 import com.jme.renderer.Camera;
39 * <code>KeyBackwardAction</code> defines an action for moving a camera along
40 * it's negative direction. How fast the camera moves in a single frame is
41 * defined by the speed of the camera times the time between frames. The speed
42 * of the camera can be thought of as how many units per second the camera can
46 * @version $Id: KeyBackwardAction.java,v 1.13 2006/11/03 09:18:54 irrisor Exp $
48 public class KeyBackwardAction extends KeyInputAction {
50 //the camera to manipulate
51 private Camera camera;
53 private static final Vector3f tempVa = new Vector3f();
56 * Constructor instantiates a new <code>KeyBackwardAction</code> object.
59 * the camera that will be affected by this action.
61 * the speed at which the camera can move.
63 public KeyBackwardAction(Camera camera, float speed) {
69 * <code>performAction</code> moves the camera along it's negative
70 * direction vector at a speed of movement speed * time. Where time is the
71 * time between frames and 1 corresponds to 1 second.
73 * @see com.jme.input.action.KeyInputAction#performAction(InputActionEvent)
75 public void performAction(InputActionEvent evt) {
76 Vector3f loc = camera.getLocation();
77 if ( !camera.isParallelProjection() ) {
78 loc.subtractLocal(camera.getDirection().mult(speed * evt.getTime(), tempVa));
80 // move down instead of backward if in parallel mode
81 loc.subtractLocal(camera.getUp().mult(speed * evt.getTime(), tempVa));