at.therefactory.jewelthief.actors.Enemy.java Source code

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Here is the source code for at.therefactory.jewelthief.actors.Enemy.java

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/*
 * Copyright (C) 2016  Christian DeTamble
 *
 * This file is part of Jewel Thief.
 *
 * Jewel Thief is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Jewel Thief is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Jewel Thief.  If not, see <http://www.gnu.org/licenses/>.
 */

package at.therefactory.jewelthief.actors;

import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.math.Vector2;

import at.therefactory.jewelthief.misc.Utils;

public abstract class Enemy extends Actor {

    protected final float speed;
    protected Vector2 movementInverter;

    protected Enemy(String spriteId, float speed) {
        super(spriteId);
        this.speed = Utils.randomWithin(speed - .3f, speed + 1);
        this.movementInverter = new Vector2(Utils.randomSignum(), Utils.randomSignum());
    }

    public void update(Rectangle enemyField) {
        if (!enemyField.contains(sprite.getBoundingRectangle())) {
            if (sprite.getBoundingRectangle().x + sprite.getBoundingRectangle().width >= enemyField.x
                    + enemyField.width) {
                movementInverter.x = -1;
            } else if (sprite.getBoundingRectangle().x <= enemyField.x) {
                movementInverter.x = 1;
            } else if (sprite.getBoundingRectangle().y + sprite.getBoundingRectangle().getHeight() >= enemyField.y
                    + enemyField.height) {
                movementInverter.y = -1;
            } else if (sprite.getBoundingRectangle().y <= enemyField.y) {
                movementInverter.y = 1;
            }
        }
        position.x += speed * movementInverter.x;
        position.y += speed * movementInverter.y;
        sprite.setPosition(position.x - sprite.getWidth() / 2, position.y - sprite.getHeight() / 2);
    }

    public void setMovementInverter(Vector2 movementInverter) {
        this.movementInverter = movementInverter;
    }

    public Vector2 getMovementInverter() {
        return movementInverter;
    }

}