Weird movement in my program[SOLVED]

[Sanction]

I can see how this could become a mess.. could I create a like a Init_Game() function and put that into the game constructor?

[Jesper Juhl]

I don't mean to be offensive, but what does this have to do with SFML?
Maybe https://isocpp.org/ or a good c++ book or stackoverflow.net or some other "learn the language" site would be a better place...

[Sanction]

ohh naw, He suggested a good idea so I had a question about it. I do own a few C++ books and all the SFML books.. thats how I've learned C++ over the past year. Do you have any idea why the game loop has like a gallop to it?

[grok]

I have had non smooth movement issues unitl I implemented the idea explained in this brilliant article: http://gafferongames.com/game-physics/fix-your-timestep/

One notable step is explained there in the section "The final touch". Your code snippets above don't apply that technique, so, maybe that's why your movements yet not smooth.

Let me quote an excerpt from the article:

To understand what is going on consider a situation where the display framerate is 60fps and the physics is running at 50fps. There is no nice multiple so the accumulator causes the simulation to alternate between mostly taking one and occasionally two physics steps per-frame when the remainders “accumulate” above dt.

Now consider that in general all render frames will have some small remainder of frame time left in the accumulator that cannot be simulated because it is less than dt. What this means is that we’re displaying the state of the physics simulation at a time value slightly different from the render time. This causes a subtle but visually unpleasant stuttering of the physics simulation on the screen known as temporal aliasing.

One solution is to interpolate between the previous and current physics state based on how much time is left in the accumulator

Hope that helps.

[Sanction]

I figured it out.. I was showing my FPS in command prompt but I was clearing it using system("CLS") and that created the wobble to the Game loop.

Thanks Everyone!

[Hapax]

I was showing my FPS in command prompt but I was clearing it using system("CLS")

I have had non smooth movement issues unitl I implemented the idea explained in this brilliant article: http://gafferongames.com/game-physics/fix-your-timestep/
One notable step is explained there in the section "The final touch".

The final touch does make an outstanding difference!
It took me a few reads and a break to understand it though 

[Sanction]

I will come back to it after I learn the general grasp of using the SFML library. I do want to create some physics.

[Hapax]

When you do your physics, make sure it's inside the timestep loop; it's a part of the update section. That way, your physics should do what you expect them to. Remember that physics are based on time so you have to be in control of your time before you can be in control of your physics 

You may find my small timing library, Kairos, to be useful. It includes a couple of classes that help simplify timestep usage. Have a look at Timestep Lite.