2 * Copyright (c) 2003-2009 jMonkeyEngine
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 package com.jme.input.action;
35 import com.jme.math.Vector3f;
36 import com.jme.renderer.Camera;
39 * <code>KeyForwardAction</code> provides the action of moving a camera along
40 * it's direction vector. How fast the camera moves in a single frame is defined
41 * by the speed of the camera times the time between frames. The speed of the
42 * camera can be thought of as how many units per second the camera can travel.
45 * @version $Id: KeyForwardAction.java,v 1.14 2006/11/03 09:18:54 irrisor Exp $
47 public class KeyForwardAction extends KeyInputAction {
49 //temp holder for the multiplication of the direction and time
50 private static final Vector3f tempVa = new Vector3f();
51 //the camera to manipulate
52 private Camera camera;
55 * Constructor instantiates a new <code>KeyForwardAction</code> object.
58 * the camera that will be affected by this action.
60 * the speed at which the camera can move.
62 public KeyForwardAction(Camera camera, float speed) {
68 * <code>performAction</code> moves the camera along it's positive
69 * direction vector at a speed of movement speed * time. Where time is the
70 * time between frames and 1 corresponds to 1 second.
72 * @see com.jme.input.action.KeyInputAction#performAction(InputActionEvent)
74 public void performAction(InputActionEvent evt) {
75 Vector3f loc = camera.getLocation();
76 if ( !camera.isParallelProjection() ) {
77 loc.addLocal(camera.getDirection().mult(speed * evt.getTime(), tempVa));
79 // move up instead of forward if in parallel mode
80 loc.addLocal(camera.getUp().mult(speed * evt.getTime(), tempVa));