Using Delta Time to Improve Movement

Question

I looked up many threads on how to use delta time and I can't figure it out.

I want my guy to move at a constant speed every time I run the game.

So I have:

timer = new Timer(9, this);
timer.start();
then the paint method.

I tried doing start time at the beginning of the paint method and then a current time at the end of it. How would I make it affect the timer's speed or how far the player moves. I've tried multiplying the time delta by the increment to the x. nHeroX = dx*deltaTIme;

I feel like it's very simple I just need someone to tell me straight what to do please.

JavaSript?? Are you sure? – Hovercraft Full Of Eels Jan 12 '14 at 18:59 — Hovercraft Full Of Eels, Jan 12 '14 at 18:59

score 1 · Answer 1 · answered Jan 12 '14 at 19:00

1

Get the system time from the System object.
Get it again during your animation. Delta time is nothing more than subtraction.
Get rid of the JavaScript tag. The languages are completely different.

answered Jan 12 '14 at 19:00

Hovercraft Full Of Eels

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Okay I removed the tag adn I already did #1 and 2. Can you please explain the algorithm that uses the deltatime. – Jan 12 '14 at 19:44

score 1 · Accepted Answer · edited May 23 '17 at 11:49

Traditionally, game programming relies on a continuous loop. Anyway, all I have realized.

In this loop, you should separate model update and graphic update. In your snipset, you seem to try mixing the two things.

In this loop :
- In a first time, you let the model to update.For example : guy's move from x to x1.
- In a second time, you must refresh the graphics to allow the guy to have a new position in the screen.

The speed of your guy depends on the guy model (ex: constant in your guy class). But the speed of another type of guy could be different.

The general speed of your game relies on the FPS set in your main loop.

You can see an example on this post : Java Main Game Loop

Good luck

Using Delta Time to Improve Movement

2 Answers2