Need help with my Pong game

eektor · 2005-12-05T07:48:57

Hi everyone, I'm working with C++ and SDL to make my pong game. I have a first version of a pong game that works alright. Its just two paddles and a ball that moves back and forth. I tried to make a second version that's more modular. I was working with a SDL graphics, Input, Sprite, and Timer classes to set up a better pong game. I'm running into problems and would like someone with more experience to take a look and give me some advice. I think its kind of long to put the source here, so if you would like to help send me a pm with your e-mail address and I can send it to you. My main concern (for now, there's lots more I need to do) is that the user controlled paddle is not moving very smoothly. Also, I know I haven't put in the computer movement yet, but I wanted to take care of the user controlled paddle first. Thanks!

For Beginners

Started by eektor December 02, 2005 12:35 PM

13 comments, last by eektor 18 years, 4 months ago

Anonymous

December 02, 2005 05:35 PM

Hmmm... Just to clarify myself, this is what I do:

// CApp_Input.h#ifndef CAPP_INPUT_H#define CAPP_INPUT_H#include <SDL/SDL.h>class CApp_Input{    public:        CApp_Input();        ~CApp_Input();        Uint8 GetKey(int aKey);};#endif//CApp_Input.cpp#include <SDL/SDL.h>#include "CApp_Input.h"CApp_Input::CApp_Input(){}CApp_Input::~CApp_Input(){}Uint8 CApp_Input::GetKey(int aKey){    return (SDL_GetKeyState(NULL)[aKey]);}// in my actual game code (yup, a pong clone too)if (m_MainApp.GetKey(SDLK_LEFT))        m_Paddles[m_P1].Setx(m_Paddles[m_P1].Getx() - m_Paddles[m_P1].GetxSpeed());    if (m_MainApp.GetKey(SDLK_RIGHT))        m_Paddles[m_P1].Setx(m_Paddles[m_P1].Getx() + m_Paddles[m_P1].GetxSpeed());

That's what I do. You can implement that into your class easily. The m_Paddles[...] code is just an example, it's what I do. But your code may be extremely different.

C++

eektor

182

Author

December 04, 2005 09:00 PM

Sorry, for the late reply. I didn't get much chance to work on my game this weekend.

I did what you said and the controls are still choppy. I think it has something to do with my update function that I posted earlier. My first version of pong worked fine when I calculated the movement based on frame rate. This time I tried to make it time based and it's not working well.

Anonymous

December 04, 2005 09:58 PM

Quote:Original post by eektor
Sorry, for the late reply. I didn't get much chance to work on my game this weekend.

I did what you said and the controls are still choppy. I think it has something to do with my update function that I posted earlier. My first version of pong worked fine when I calculated the movement based on frame rate. This time I tried to make it time based and it's not working well.

Ok.. Well, you're multipling m_Vy with deltaTime, correct? What happens if you just add the velocities, without the delta time? Is it still choppy? Because technically that should be correct. Maybe you're passing in too many different times, like 0.05, 1, 5, 0.3 and so on...

Good luck!

C++

Anonymous

December 04, 2005 10:00 PM

As for the rounding, you could do this:

static_cast<typeOfYourChoice>(someValueToBeConvertedToTypeOfYourChoice);//you can use it likefloat bob = static_cast<float>(bill);// if bill was 5, bob would become 5.0

eektor

182

Author

December 05, 2005 07:48 AM

Ok, so I capped the frame rate and put the addition of delta velocity instead of multiplaction and the controls and ball movement is nice and smooth.

Only problem is somehow the screen seems to be shifting the left. Both paddles which should not move in the x direction are moving right. Do you know what could be wrong?

Need help with my Pong game

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