ProgressBarSample.java

package com.cookbook.samples;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.assets.loaders.resolvers.InternalFileHandleResolver;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.maps.tiled.TiledMap;
import com.badlogic.gdx.maps.tiled.TmxMapLoader;
import com.badlogic.gdx.maps.tiled.renderers.OrthogonalTiledMapRenderer;
import com.badlogic.gdx.math.Vector2;


public class ProgressBarSample extends GdxSample {
	private static final String TAG = "ProgressBarSample";
	
	private SpriteBatch batch;
	
	private Texture background, logo, progressBarImg, progressBarBaseImg;
	private TiledMap map;
	
	private float unitScale;
	private OrthogonalTiledMapRenderer renderer;
	private OrthographicCamera camera;
	
	private Vector2 logoPos, pbPos;
	
	private AssetManager manager;

	@Override
	public void create () {
		batch = new SpriteBatch();
		manager = new AssetManager();
		
		// Load assets, it is being loaded a map because it is a good example for dependencies between
		// assets, so don't focus on the map itself considering that it will be explained in later recipes
		manager.setLoader(TiledMap.class, new TmxMapLoader(new InternalFileHandleResolver()));
		manager.load("data/loading_screen/map.tmx", TiledMap.class);
		unitScale = 1/16f;
		
		manager.load("data/loading_screen/background.png", Texture.class);
		manager.load("data/loading_screen/logo.png", Texture.class);
		manager.load("data/loading_screen/progress_bar.png", Texture.class);
		manager.load("data/loading_screen/progress_bar_base.png", Texture.class);
		manager.finishLoading(); // Blocks until all resources are loaded into memory
		Gdx.app.log(TAG, "Assets loaded");
		
		// Get Assets
		background = manager.get("data/loading_screen/background.png");
		map = manager.get("data/loading_screen/map.tmx");
		logo = manager.get("data/loading_screen/logo.png");
		progressBarImg = manager.get("data/loading_screen/progress_bar.png");
		progressBarBaseImg = manager.get("data/loading_screen/progress_bar_base.png");
		
		renderer = new OrthogonalTiledMapRenderer(map, unitScale);
		camera = new OrthographicCamera();
		camera.setToOrtho(false, 80, 45);
		camera.update();
		
		// Get logo position
		logoPos = new Vector2();
		// >> bitwise operator bill just divide by 2, the explicitly written times, in this case 1
		logoPos.set((Gdx.graphics.getWidth()-logo.getWidth())>>1, Gdx.graphics.getHeight()>>1);

		// ProgressBar position
		pbPos = new Vector2();
		pbPos.set(logoPos.x, logoPos.y - (logo.getHeight()));
		
		// Load assets for the next screen (random assets example)
		manager.load("data/caveman.png", Texture.class);
		manager.load("data/facebook.png", Texture.class);
		manager.load("data/jungle-level.png", Texture.class);
		manager.load("data/libgdx.png", Texture.class);
		manager.load("data/menu.png", Texture.class);
		manager.load("data/star.png", Texture.class);
		manager.load("data/prehistoric.png", Texture.class);
		manager.load("data/trex-sheet.png", Texture.class);
		manager.load("data/uiskin.png", Texture.class);
	}

	@Override
	public void dispose() {
		manager.dispose();
		renderer.dispose();
		batch.dispose();
	}
	
	@Override
	public void render () {
		Gdx.gl.glClearColor(1, 0, 0, 1);
		Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
		
		// Render background image
		batch.begin();
		batch.draw(background, 0, 0);
		batch.end();
		
		// Render map
		renderer.setView(camera);
		renderer.render();
		
		// Render Logo and Loading Bar
		batch.begin();
		batch.draw(logo, logoPos.x, logoPos.y);
		batch.draw(progressBarBaseImg, pbPos.x, pbPos.y);
		batch.draw(progressBarImg, pbPos.x, pbPos.y, progressBarImg.getWidth()*manager.getProgress(), progressBarImg.getHeight());
		batch.end();
		
		if (manager.update()) {
			//Go to Game-screen
        }
	}
	
}