src/com/replica/replicaisland/MovementComponent.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.replica.replicaisland;


/**
 * A game component that implements velocity-based movement.
 */
public class MovementComponent extends GameComponent {
    // If multiple game components were ever running in different threads, this would need
    // to be non-static.
    private static Interpolator sInterpolator = new Interpolator();

    public MovementComponent() {
        super();
        setPhase(ComponentPhases.MOVEMENT.ordinal());
    }
    
    @Override
    public void reset() {
        
    }
    
    @Override
    public void update(float timeDelta, BaseObject parent) {
        GameObject object = (GameObject) parent;

        sInterpolator.set(object.getVelocity().x, object.getTargetVelocity().x,
                object.getAcceleration().x);
        float offsetX = sInterpolator.interpolate(timeDelta);
        float newX = object.getPosition().x + offsetX;
        float newVelocityX = sInterpolator.getCurrent();

        sInterpolator.set(object.getVelocity().y, object.getTargetVelocity().y,
                object.getAcceleration().y);
        float offsetY = sInterpolator.interpolate(timeDelta);
        float newY = object.getPosition().y + offsetY;
        float newVelocityY = sInterpolator.getCurrent();

        if (object.positionLocked == false) {
            object.getPosition().set(newX, newY);
        }
        
        object.getVelocity().set(newVelocityX, newVelocityY);
    }

}