Messages

1

General / Re: Difference of passing a * parameter and a & parameter

« on: June 10, 2017, 03:35:17 pm »

So you mean the function would also work if I changed the * in changeState and pushState parameter to the & symbol?

2

General / Difference of passing a * parameter and a & parameter

« on: June 10, 2017, 03:27:30 pm »

I was reading a tutorial on the internet about game states and then they showed a class of game state with these functions in it:

Code: [Select]

class CGameEngine
{
public:
//... some functions

  void ChangeState(CGameState* state);
  void PushState(CGameState* state);

private:
  // the stack of states
  vector<CGameState*> states;
//... some variables
};


My question is, why is the changeState and pushState need a parameter with *? I thought you would use the & symbol if you want to pass the actual object/variables instead of the copy. Is there any difference? Thank you in advance! 

3

Graphics / How to create a simple pause if win condition is true?

« on: June 08, 2017, 03:18:00 pm »

I wanted to create a simple pause in my pong game so that if any of the player reach a certain score, the game will freeze and a text shows up saying which player has won the game and if a certain key is pressed the game will restart. I tried this: (sorry if it's too simple, I'm a complete newbie  )

Code: [Select]

// ball went through bottom of the window
        if(ball.getPosition().top > windowHeight)
        {
            ball.initPos();
            bat1.initPos();
            bat2.initPos();
            lives1--; // p1's life is negated

            // life check, reset values if true
            if(lives1 < 1)
            {
                score2++;
                lives1 = 3;
            }
        }

        // ball went through top of the window
        if(ball.getPosition().top < 0)
        {
            ball.initPos();
            bat1.initPos();
            bat2.initPos();
            lives2--; // p2's life is negated

            // life check, reset values if true
            if(lives2 < 1)
            {
                score1++;
                lives2 = 3;
            }
        }


4

Graphics / Re: Rectangle Object collides with Text object

« on: June 08, 2017, 10:46:41 am »

Hehe thanks 

5

Graphics / Re: Rectangle Object collides with Text object

« on: June 06, 2017, 07:49:33 pm »

Oops, my bad! The ball didn't get stuck to the HUD. It actually got stuck to the paddle when it was right behind the HUD (noob error!).

6

Graphics / Rectangle Object collides with Text object

« on: June 06, 2017, 07:23:44 pm »

I have made a little Pong project. I wanted to put a heads up display using sf::Text to it but it turns out the ball (not really, it's a rectangle from sf::RectangleShape) will get stuck when it went through the text. And apparently, the paddle got stuck too! Is there anyway I can make the HUD/the text kind of 'invisible' to the ball and the paddle? Thank you in advance!

7

Graphics / Simple Map Borders

« on: May 14, 2017, 02:00:18 pm »

How do I create like an invisible wall at each side of my window so any moving object can not pass through it? I tried setting the speed to 0 or multiplying it by -1 if the object reach the side, but if I press the arrow keys several times it would still go through it. Sorry if this sounds like a noob question. Thank you in advance! 

8

Graphics / Re: Passing Entity Position to an If Statement

« on: May 14, 2017, 11:16:21 am »

Ah, thank you very much!  And yes, by entity I meant object! 

9

Graphics / Passing Entity Position to an If Statement

« on: May 14, 2017, 08:02:42 am »

Is there any simple way to get the entity position to use it in an if statement? I want to use lit like if the moving entity reach a certain point, it will change the direction. And if you want to put any examples / explanation please put it as simple as possible because I'm just starting to learn game programming. Thank you in advance!