Hey guys,
I’m trying to learn more about LibGDX, Slick2D and LWJGL. To compare those 3, I’ve done my own Snake-Game with own graphics and so on.
Slick2D works fine. And in generally in LibGDX it works finde, too… But i’ve done some tests with big snakes… And the FPS with LibGDX goes down with a Snake-size over 280. It goes down to 20!
Is it because of bad code?
To compare it to my Slick2D project, it is fast til snake size of 1600!
Here is my Code for the GameScreen in which the snake is drawn
package com.mygdx.view;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Screen;
import com.badlogic.gdx.Input.Keys;
import com.badlogic.gdx.graphics.Color;
import com.mygdx.game.Snake2D;
import com.mygdx.model.Food;
import com.mygdx.model.Highscore;
import com.mygdx.model.Snake;
import com.mygdx.model.Body;
public class GameScreen implements Screen{
private Snake2D game;
CharSequence string;
private Highscore hs;
private Snake snake;
private Food food;
public int points;
private float time;
private float multi;
private String name;
private int richtung; // 0 = Rechts , 1 = Runter, 2 = Links, 3 = Hoch
public GameScreen(Snake2D game, String name){
this.game = game;
hs = new Highscore();
this.name = name;
time = 0;
multi = (float) 1.25;
richtung = 0;
points = 0;
//Schlange und Essen initialisieren
snake = new Snake();
food = new Food();
game.font.setColor(Color.BLACK);
}
@Override
public void show() {
}
@Override
public void render(float delta) {
//Update part
time += delta;
time *= multi;
if(snake.getSnake().get(0).getTangle().overlaps(food.getFood())){
food = new Food();
points += 10;
if(snake.getSnake().size() % 3 == 0){
multi += 0.025;
}
}
if(time >= 1){
if(richtung == 0){
snake.snakeRight(food);
}
else if(richtung == 1){
snake.snakeDown(food);
}
else if(richtung == 2){
snake.snakeLeft(food);
}
else{
snake.snakeUp(food);
}
time = 0;
}
testOver();
handleInput();
//Render Part
for(Body b: snake.getSnake()){
game.batch.begin();
game.font.draw(game.batch,"Punkte: "+points, Gdx.graphics.getWidth()-100, Gdx.graphics.getHeight()-10);
game.font.draw(game.batch,"FPS: " + Gdx.graphics.getFramesPerSecond(), 100, Gdx.graphics.getHeight()-10);
game.batch.draw(b.getImg(),b.getTangle().getX(), b.getTangle().getY());
game.batch.draw(food.getImg(), food.getFood().getX(), food.getFood().getY());
game.batch.end();
}
}
@Override
public void resize(int width, int height) {
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void hide() {
}
@Override
public void dispose() {
for(Body b : snake.getSnake()){
b.getImg().dispose();
}
hs.addScore(name, points);
game.setScreen(new HighscoreScreen(game));
}
public void handleInput() {
if(Gdx.input.isKeyJustPressed(Keys.UP) && richtung != 1){
richtung = 3;
}
if(Gdx.input.isKeyJustPressed(Keys.RIGHT) && richtung != 2){
richtung = 0;
}
if(Gdx.input.isKeyJustPressed(Keys.DOWN) && richtung != 3){
richtung = 1;
}
if(Gdx.input.isKeyJustPressed(Keys.LEFT) && richtung != 0){
richtung = 2;
}
if(Gdx.input.isKeyJustPressed(Keys.ESCAPE)){
game.setScreen(new MenuScreen(game));
}
}
public void testOver(){
for(int i = 1; i < snake.getSnake().size(); i++){
if(snake.getSnake().get(0).getTangle().overlaps(snake.getSnake().get(i).getTangle())){
if(name != null){
dispose();
}
}
}
if(snake.getSnake().get(0).getTangle().getX() >= 600 || snake.getSnake().get(0).getTangle().getX() < 0){
if(name != null){
dispose();
}
}
if(snake.getSnake().get(0).getTangle().getY() >= 4600 || snake.getSnake().get(0).getTangle().getY() < 0){
if(name != null){
dispose();
}
}
}
}
This is my Snake class.
package com.mygdx.model;
import java.util.ArrayList;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.math.Rectangle;
public class Snake {
private ArrayList<Body> snake;
private Texture headR, headL, headO, headU, body;
public Snake(){
snake = new ArrayList<Body>();
headR = new Texture(Gdx.files.internal("Schlangenkopf.png"));
headL = new Texture(Gdx.files.internal("SchlangenkopfL.png"));
headU = new Texture(Gdx.files.internal("SchlangenkopfU.png"));
headO = new Texture(Gdx.files.internal("SchlangenkopfO.png"));
body = new Texture(Gdx.files.internal("Snakebody.png"));
Rectangle one = new Rectangle(20,Gdx.graphics.getHeight()/2,10,10);
Rectangle two = new Rectangle(10,Gdx.graphics.getHeight()/2,10,10);
snake.add(new Body(one,one.getX(), one.getY(), headR));
snake.add(new Body(two,two.getX(), two.getY(), body));
}
public void snakeRight(Food food){
//Dem Kopf das richtige Bild zuweisen
snake.get(0).setImg(headR);
//Die alte X Position speichern, für die nachfolgenden Teile
snake.get(0).setOldX(snake.get(0).getTangle().getX());
snake.get(0).setOldY(snake.get(0).getTangle().getY());
snake.get(0).getTangle().setX(snake.get(0).getTangle().getX()+10);
testAdd(food);
snakeVor();
}
public void snakeLeft(Food food){
snake.get(0).setImg(headL);
snake.get(0).setOldX(snake.get(0).getTangle().getX());
snake.get(0).setOldY(snake.get(0).getTangle().getY());
snake.get(0).getTangle().setX(snake.get(0).getTangle().getX()-10);
testAdd(food);
snakeVor();
}
public void snakeUp(Food food){
snake.get(0).setImg(headO);
snake.get(0).setOldX(snake.get(0).getTangle().getX());
snake.get(0).setOldY(snake.get(0).getTangle().getY());
snake.get(0).getTangle().setY(snake.get(0).getTangle().getY()+10);
testAdd(food);
snakeVor();
}
public void snakeDown(Food food){
snake.get(0).setImg(headU);
snake.get(0).setOldX(snake.get(0).getTangle().getX());
snake.get(0).setOldY(snake.get(0).getTangle().getY());
snake.get(0).getTangle().setY(snake.get(0).getTangle().getY()-10);
testAdd(food);
snakeVor();
}
public void snakeVor(){
for(int i=1; i < snake.size();i++){
snake.get(i).setOldX(snake.get(i).getTangle().getX());
snake.get(i).setOldY(snake.get(i).getTangle().getY());
snake.get(i).getTangle().setX(snake.get(i-1).getOldX());
snake.get(i).getTangle().setY(snake.get(i-1).getOldY());
}
}
public void testAdd(Food food){
if(snake.get(0).getTangle().overlaps((food.getFood())) || snake.size() < 800){
Rectangle tangle = new Rectangle(snake.get(snake.size()-1).getTangle().getX(), snake.get(snake.size()-1).getTangle().getY(),10,10);
snake.add(new Body(tangle,tangle.getX(),tangle.getY(), body));
}
}
public ArrayList<Body> getSnake() {
return snake;
}
public void setSnake(ArrayList<Body> snake) {
this.snake = snake;
}
}
Sorry for my bad english. Maybe you’ll see some “german words” in my comments. It’s because I’m from germany 
Hope you can help me!