Does Phaser Arcade.Body velocity include deltaTime or not?

Question

I want to move my character along the x axis with constantly speed. I thought move depends on frame rate. So, technically I should write

sprite.body.velocity.x = speed * deltaTime

where deltaTime = game.time.elapsedMS / 1000;

But if I'm doing that - my character moves vvvvverrry slooow, even if speed = 1000.

But if I'm writing

sprite.body.velocity.x = speed

it works fine. My fps = 60;

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Phaser Documentation says:

velocity - The velocity, or rate of change in speed of the Body. Measured in pixels per second.

no deltatime....

and all demos do not have deltatime

http://phaser.io/examples/v2/arcade-physics/platformer-basics

http://phaser.io/examples/v2/arcade-physics/asteroids-movement

etc.

So, I don't understand: shoud I calculate deltaTime or just use velocity.x?

Answer 1

Well.... I think I'm stupid...

My calculation of the deltaTime was wrong

The correct formula will be

deltaTime = (elapsedMS * fps) / 1000

elapsedMS - The time in ms since the last time update, in milliseconds, based on time.

fps - Frames per second. (Only calculated if advancedTiming is enabled).

So, that was my problem.

---

As the result

body.velocity doesn't include calculation of deltaTime and for smooth movement should use deltaTime that calculated by the formula above.

And it will be something like that

function update() { // <-- it is phaser state method...is called every frame
    deltaTime = (elapsedMS * fps) / 1000;
    sprite.body.velocity.x = velocityX * deltaTime;
    sprite.body.velocity.y = velocityY * deltaTime;
}