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  [Solved] Slick 2D Camera Help  (Read 3938 times)
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Offline duce

Senior Newbie





« Posted 2011-09-19 18:45:55 »

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public class Game extends BasicGame {
   private static AppGameContainer app;
   
   //TODO: Rename.
  private float scale = 1.3f;
   
   private Input input;
   
   Image bg;
   
   Image player;
   float playerX;
   float playerY;
   float playerCenterX;
   float playerCenterY;
   float playerRotation;
   float speed = 0.2f;
   Rectangle camera;
   int cameraX = 0;
   int cameraY = 0;
   
   TiledMap tm;
   
   public Game(String title) {
      super(title);
   }
   
   @Override
   public void init(GameContainer container) throws SlickException {
      //camera = new Rectangle(0, 0, 800, 600);
     player = new Image("res/player.png");
      playerX = 400 - player.getWidth() / 2;
      playerY = 300 - player.getHeight() / 2;
     
      bg = new Image("res/bg.png");
     
      tm = new TiledMap("res/tilemaps/grass.tmx");
   }

   @Override
   public void render(GameContainer container, Graphics g) throws SlickException {
      //g.scale(scale, scale);
     playerCenterX = playerX + player.getWidth() / 2;
      playerCenterY = playerY + player.getHeight() / 2;
      tm.render(cameraX, cameraY);
      //bg.draw(cameraX, cameraY);
     player.draw(cameraX + playerX, cameraY + playerY);
   }

   @Override
   public void update(GameContainer container, int delta) throws SlickException {
      // Set the input handler.
     input = container.getInput();
      // Respond to input.
     
      // Rotate player according to current mouse position.
     player.setRotation(mouseRotate());
     
      playerRotation = player.getRotation();
     
      if (input.isKeyDown(Input.KEY_W)) {
         playerY -= speed * delta;
         cameraY += speed * delta;
      }
     
      if (input.isKeyDown(Input.KEY_A)) {
         playerX -= speed * delta;
         cameraX += speed * delta;
      }
     
      if (input.isKeyDown(Input.KEY_S)) {
         playerY += speed * delta;
         cameraY -= speed * delta;
      }
     
      if (input.isKeyDown(Input.KEY_D)) {
         playerX += speed * delta;
         cameraX -= speed * delta;
      }
   }
   
   private float mouseRotate() {
     
      //float radiansToMouse = (float) Math.atan2(playerCenterX - cameraX - input.getMouseX(), playerCenterY - cameraY - input.getMouseY());
     float radiansToMouse = (float) Math.atan2(400 - input.getMouseX(), 300 - input.getMouseY());
      float degreesToMouse = (57.2957795f * radiansToMouse) * -1;
     
      return degreesToMouse;
   }
   
   public static void main(String[] args) throws SlickException {
      // Initialize new AppGameContainer
     // TODO: Change this to different resolutions.
     app = new AppGameContainer(new Game("Top Down Shooter"), 800, 600, false);
      app.start();
   }
   
}


Here is my game code. Basically, my problem is that the cameraX and cameraY positions do not move when I press the arrow keys, but the player's do.
It is really weird. Sometimes the camera will move, sometimes it won't. My game is running at 3000 fps. I don't know why, but the camera has been weird for me, it doesn't always move, meanwhile, the player sprite does.

It looks like when it freezes, the delta value goes to 1. I don't know if that will help.

Edit: Solved! I changed the int cameraX and Y to floats, worked perfectly.
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