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  [Slick2D] Movement Trouble  (Read 322 times)
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Offline Jacob Pickens

JGO Ninja


Medals: 35
Projects: 4
Exp: 1 year


I Don't Get It.


« Posted 2014-03-04 05:56:50 »

I'm trying to get my player to move smoothly. In my game though he is really jumpy and it just doesnt look smooth. here's me code:

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public void update(GameContainer gc, StateBasedGame sbg, int delta) {
      Input input = gc.getInput();
     
      x += velX;
     
      if(input.isKeyDown(Input.KEY_RIGHT)) {
         velX = delta * .1f;
      }else if(input.isKeyDown(Input.KEY_LEFT)) {
         velX = -(delta * .1f);
      }else{
         velX = 0;
      }
   }

I don't have a single clue what Drenius is talking about.
Offline HeroesGraveDev

JGO Kernel


Medals: 360
Projects: 11
Exp: 3 years


┬─┬ノ(ಠ_ಠノ)(╯°□°)╯︵ ┻━┻


« Reply #1 - Posted 2014-03-04 06:16:04 »

Delta-step loops don't play well with acceleration.

Offline Jacob Pickens

JGO Ninja


Medals: 35
Projects: 4
Exp: 1 year


I Don't Get It.


« Reply #2 - Posted 2014-03-04 06:18:06 »

haha ya I fixed it. The correct code:

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import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Image;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.state.StateBasedGame;

public class Player {

   float x = 100;
   float y = 100;
   
   double velX = 0;
   double velY = 0;
   
   Image sprite;
   
   public Player() {
      try {
         sprite = new Image("res/ZN_Idle.png");
      } catch (SlickException e) {
         e.printStackTrace();
      }
   }
   
   public void render(Graphics g) {
      g.drawImage(sprite, (int)x, (int)y);
   }
   
   public void update(GameContainer gc, StateBasedGame sbg, int delta) {
      Input input = gc.getInput();
     
      x += velX;
     
      if(input.isKeyDown(Input.KEY_RIGHT)) {
         velX = .13;
      }else if(input.isKeyDown(Input.KEY_LEFT)) {
         velX = -.13;
      }else{
         velX = 0;
      }
   }
   
}

I don't have a single clue what Drenius is talking about.
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