Maykel Matheus Dias GestureAdapter use (updated pinch zoom)

package com.tiled.tiledexample.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.input.GestureDetector;
import com.badlogic.gdx.input.GestureDetector.GestureAdapter;
import com.badlogic.gdx.maps.tiled.TiledMap;
import com.badlogic.gdx.maps.tiled.TiledMapTileLayer;
import com.badlogic.gdx.maps.tiled.TmxMapLoader;
import com.badlogic.gdx.maps.tiled.renderers.IsometricTiledMapRenderer;
import com.badlogic.gdx.math.Vector2;

public class GameScreen implements Screen {

    private TiledMap gamemap;
    private OrthographicCamera camera;
    private IsometricTiledMapRenderer maprenderer;

    @Override
    public void render(float delta) {
        Gdx.gl.glClearColor(0, 0, 0, 13);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        maprenderer.setView(camera);
        maprenderer.render();
    }

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

        camera.position.x = ((TiledMapTileLayer) gamemap.getLayers().get(0)).getWidth() * ((TiledMapTileLayer) gamemap.getLayers().get(0)).getTileWidth() / 2;
        camera.update();
    }

    @Override
    public void show() {
        gamemap = new TmxMapLoader().load("maps/map2.tmx");
        maprenderer = new IsometricTiledMapRenderer(gamemap);

        camera = new OrthographicCamera();

        Gdx.input.setInputProcessor(new GestureDetector(new GestureAdapter() {

            @Override
            public boolean pinch(Vector2 initialPointer1, Vector2 initialPointer2, Vector2 pointer1, Vector2 pointer2) {
                // set camera.zoom here
                // something like this could work, but I didn't test it:
                float zoomFactor = (initialPointer1.dst(pointer1) + initialPointer2.dst(pointer2)) / 2 / 20;
                if(initialPointer1.dst(initialPointer2) > pointer1.dst(pointer2))
                    camera.zoom += zoomFactor;
                else
                    camera.zoom -= zoomFactor;
                return true;
            }
        }));

    }

    @Override
    public void hide() {
        dispose();

    }

    @Override
    public void pause() {
    }

    @Override
    public void resume() {
    }

    @Override
    public void dispose() {
        gamemap.dispose();
        maprenderer.dispose();
    }

}