PlayScreen.java

package com.britishpenguin.astrowarrior.screens;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.britishpenguin.astrowarrior.AstroWarrior;
import com.britishpenguin.astrowarrior.entity.Entity;
import com.britishpenguin.astrowarrior.entity.enemy.SpaceshipEnemy;

import java.util.ArrayList;

public class PlayScreen implements Screen {

    private OrthographicCamera camera;
    private SpriteBatch batch;
    private final AstroWarrior game;

    public PlayScreen(AstroWarrior game) {
        this.game = game;
        camera = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        //camera.update();
        batch = game.batch;
    }

    @Override
    public void show() {

    }

    @Override
    public void render(float delta) {
        camera.translate(Gdx.graphics.getWidth() / 2f, Gdx.graphics.getHeight() / 2f, 0);
        camera.update();
        batch.setProjectionMatrix(camera.combined);
        Gdx.gl.glClearColor(0, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        batch.begin();
        for (Entity entity : new ArrayList<>(game.renderedSprites)) {
            if (entity.isBeingDamaged()) {
                entity.setColor(0.6f, 0.6f, 0.6f, 1f);
            }
            entity.update(Gdx.graphics.getDeltaTime(), batch);
            entity.draw(batch);
            entity.setColor(1, 1, 1, 1);
        }

        game.fontRenderer.draw(batch, "Health: " + game.player.getCurrentHealth() + " | Mana: " + game.player.getCurrentMana() + " | Difficulty: " + game.difficulty, 10, Gdx.graphics.getHeight() - 10);
        batch.end();

        if (game.gameSettings.keySpawnEnemy.isPressed()) {
            game.renderedSprites.add(new SpaceshipEnemy(game, MathUtils.random(0, Gdx.graphics.getWidth()), MathUtils.random(0, Gdx.graphics.getHeight()), MathUtils.random(0f, 360f)));
        }

        if (game.renderedSprites.stream().filter(e -> e instanceof SpaceshipEnemy).count() < 1) {
            game.nextWave();
        }
        try {
            Thread.sleep(1000);
        } catch (Exception e) {}
    }

    @Override
    public void resize(int width, int height) {
        camera.viewportWidth = width;
        camera.viewportHeight = height;
        camera.update();
    }

    @Override
    public void pause() {

    }

    @Override
    public void resume() {

    }

    @Override
    public void hide() {

    }

    @Override
    public void dispose() {

    }

}