MeteorControl.java

/*
 * The MIT License (MIT)
 *
 * FXGL - JavaFX Game Library
 *
 * Copyright (c) 2015-2017 AlmasB (almaslvl@gmail.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.almasb.fxglgames.spaceinvaders.control;

import com.almasb.fxgl.app.FXGL;
import com.almasb.fxgl.ecs.AbstractControl;
import com.almasb.fxgl.ecs.Entity;
import com.almasb.fxgl.entity.component.PositionComponent;
import com.almasb.fxgl.entity.component.RotationComponent;
import javafx.geometry.Point2D;

/**
 * @author Almas Baimagambetov (AlmasB) (almaslvl@gmail.com)
 */
public class MeteorControl extends AbstractControl {

    private RotationComponent rotation;
    private PositionComponent position;

    private Point2D velocity;

    @Override
    public void onAdded(Entity entity) {
        rotation = entity.getComponentUnsafe(RotationComponent.class);
        position = entity.getComponentUnsafe(PositionComponent.class);

        double w = FXGL.getSettings().getWidth();
        double h = FXGL.getSettings().getHeight();

        velocity = new Point2D(position.getX() < w / 2 ? 1 : -1, position.getY() < h / 2 ? 1 : -1)
            .normalize().multiply(Math.random() * 5 + 50);
    }

    @Override
    public void onUpdate(Entity entity, double tpf) {
        rotation.rotateBy(tpf * 10);

        position.translate(velocity.multiply(tpf));
    }
}