keystraferightaction.java

来自「java 3d game jme 工程开发源代码」· Java 代码 · 共 76 行

/*
 * Copyright (c) 2003-2009 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 
 *   may be used to endorse or promote products derived from this software 
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

package com.jme.input.action;

import com.jme.math.Vector3f;
import com.jme.renderer.Camera;

/**
 * <code>KeyStrafeLeftAction</code> defines an action that causes the camera
 * to move along the negative left vector. The speed at which it moves is set
 * and of the form units per second.
 * 
 * @author Mark Powell
 * @version $Id: KeyStrafeRightAction.java,v 1.13 2006/11/03 09:18:54 irrisor Exp $
 */
public class KeyStrafeRightAction extends KeyInputAction {
    //the camera to manipulate
    private Camera camera;
    //temporary vector to hold the translation
    private static final Vector3f tempVa = new Vector3f();

    /**
     * Constructor instantiates a new <code>KeyStrafeLeftAction</code> object.
     * 
     * @param camera
     *            the camera to move along the negative left vector.
     * @param speed
     *            the speed at which to move the camera.
     */
    public KeyStrafeRightAction(Camera camera, float speed) {
        this.camera = camera;
        this.speed = speed;
    }

    /**
     * <code>performAction</code> moves the camera along the negative left
     * vector for a given distance of speed * time.
     * 
     * @see com.jme.input.action.KeyInputAction#performAction(InputActionEvent)
     */
    public void performAction(InputActionEvent evt) {
        Vector3f loc = camera.getLocation();
        loc.subtractLocal(camera.getLeft().mult(speed * evt.getTime(), tempVa));
        camera.update();
    }
}