docsReading time: 6 minutes

Keyboard Input

Chapter 1: Setting

1) Clone the code

git clone https://github.com/gurkenlabs/litiengine-gurk-nukem.git

2) Create a directory Create a directory de/gurkenlabs/litiengine/input inside src folder. Create KeyboardEntityController.java file inside the input folder.

Chapter 2: Let's move the character with the directional keys

Paste the following code to the KeyboardEntityController.java file

package  de.gurkenlabs.litiengine.input;

import  java.awt.event.KeyEvent;
import  java.util.ArrayList;
import  java.util.List;
import  de.gurkenlabs.litiengine.entities.IMobileEntity;
import  de.gurkenlabs.litiengine.physics.MovementController;
import  de.gurkenlabs.litiengine.util.ListUtilities;

public  class  KeyboardEntityController<T  extends  IMobileEntity> extends  MovementController< T > {
  private  final  List <Integer > up;
  private  final  List <Integer > down;
  private  final  List <Integer > left;
  private  final  List <Integer > right;
  public  KeyboardEntityController(final  T  entity) {
    this (entity, KeyEvent.VK_UP, KeyEvent.VK_DOWN, KeyEvent.VK_LEFT, KeyEvent.VK_RIGHT);  // You can customize these key. 
  }
  public  KeyboardEntityController(final  T  entity, final  int  up, final  int  down, final  int  left, final  int  right) {
    super (entity);
    this .up = new  ArrayList <>();
    this .down = new  ArrayList <>();
    this .left = new  ArrayList <>();
    this .right = new  ArrayList <>();
    this .up.add(up);
    this .down.add(down);
    this .left.add(left);
    this .right.add(right);
    Input.keyboard().onKeyPressed(this::handlePressedKey);
  }
  public  void  handlePressedKey(final  KeyEvent  keyCode) {
    if  (this .up.contains(keyCode.getKeyCode())) {
      this .setDy(this .getDy() - 1 );
    } else  if  (this .down.contains(keyCode.getKeyCode())) {
      this .setDy(this .getDy() + 1 );
    } else  if  (this .left.contains(keyCode.getKeyCode())) {
      this .setDx(this .getDx() - 1 );
    } else  if  (this .right.contains(keyCode.getKeyCode())) {            // getDx, getDy tells the current coodinates of the character.
      this .setDx(this .getDx() + 1 );                                    // setDx, setDy sets the coodinates of the character.
    }
  }
  public  void  addUpKey(int  keyCode) {
    if  (this .up.contains(keyCode)) {
      return ;
    }
    this .up.add(keyCode);
  }
  public  void  addDownKey(int  keyCode) {
    if  (this .down.contains(keyCode)) {
      return ;
    }
    this .down.add(keyCode);
  }
  public  void  addLeftKey(int  keyCode) {
    if  (this .left.contains(keyCode)) {
      return ;
    }
    this .left.add(keyCode);
  }
  public  void  addRightKey(int  keyCode) {
    if  (this .right.contains(keyCode)) {
      return ;
    }
    this .right.add(keyCode);
  }
  public  List <Integer > getUpKeys() {
    return  this .up;
  }
  public  List <Integer > getDownKeys() {
    return  this .down;
  }
  public  List <Integer > getLeftKeys() {
    return  this .left;
  }
  public  List <Integer > getRightKeys() {
    return  this .right;
  }
  public  void  setUpKeys(int ... up) {
    this .setUpKeys(ListUtilities.getIntList(up));
  }
  public  void  setUpKeys(List <Integer > up) {
    set(this .up, up);
  }
  public  void  setDownKeys(int ... down) {
    this .setDownKeys(ListUtilities.getIntList(down));
  }
  public  void  setDownKeys(List <Integer > down) {
    set(this .down, down);
  }
  public  void  setLeftKeys(int ... left) {
    this .setLeftKeys(ListUtilities.getIntList(left));
  }
  public  void  setLeftKeys(List <Integer > left) {
    set(this .left, left);
  }
  public  void  setRightKeys(int ... right) {
    this .setRightKeys(ListUtilities.getIntList(right));
  }
  public  void  setRightKeys(List <Integer > right) {
    set(this .right, right);
  }
  private  static  void  set(List <Integer > keyList, List <Integer > keys) {
    keyList.clear();
    for  (int  key : keys) {
      keyList.add(key);
    }
  }
}

Chapter 3: Let's play

Let's execute the program by build Program.java inside src/com/litiengine/gurknukem


hanwoolskyLast updated 4 months ago
On this page