Slick Forums

public void centerOn(float x, float y) {
      //try to set the given position as center of the camera by default
      cameraX = (x - gc.getWidth() / (Globals.scale * 2));
      cameraY = (y - gc.getHeight() / (Globals.scale * 2))

public void render(GameContainer container, StateBasedGame game, Graphics g) throws SlickException {
      
      g.scale(Globals.scale, Globals.scale);
      camera.drawMap();
      camera.translateGraphics();
      super.render(container, game, g); //renders all my entities
      camera.untranslateGraphics();
      g.scale(1,1);

...

    @Override
    public void mouseWheelMoved(int change) {
       if (change < 0 && Globals.scale > 1f) {
          Globals.scale -= 1f;
       }
       
       if (change > 0 && Globals.scale < 5f) {
          Globals.scale += 1f;
       }
    }

//normal rendering
//...

//"push" the current transform onto the stack
g.pushTransform();

      // add some scaling/translating/rotating
      // render ...

//"pop" the transform, leaving us with the transform we had previously
g.popTransform();

//normal rendering
//...