Adjusting game speed for different devices using ARCADE Physics

[kmp]

I have a game where all the movement is run by ARCADE physics. When I run the game on my desktop it runs faster than it does on my Android phone and my Kindle Fire.

 

I would like the game to run at the same speed on all devices but, as movement is controlled by the physics engine, I cannot directly adjust sprite movement.

 

Does anyone have a good technique for this?

 

Ths only thing I can think of is to set an ideal rate (60 fps) - the speed on Firefox on my desktop - and change all the physics engine values in proportion to how the device matches this speed, like this:

 

this.game.physics.arcade.gravity.y = 200 * (idealfps / actualfps);

 

So on a desktop runing at 60fps the gravity setting would be 200 * (60/60) = 200.

 

On a slow dvice with only 30 fps then the gravity would be 200 * (60/30) = 400

 

So sprites woudl fall at the same rate as on the faster machine.

 

Is this the best way to go about it?

 

Thanks in advance

 

Ken

 

 

[Sam]

You should optimize your game for the slowest device, there are several posts on it.
a simple Arcade-style game should be able to run at 60FPS on a modern mobile device.

http://www.html5gamedevs.com/topic/9931-mobile-performance-tips-tricks/

 

[valueerror]

what about this new feature in 2.2 ?

  game.time.desiredFps = 30;

this would set the physics calculations to 30fps (independent of the actual rendered frames per second) 

that way the whole game would run at half the speed

[rich]

Everything we've been working on in the dev branch is aimed at addressing these timing issues. It will form the basis of the 2.2 release later in the month.

[kmp]

Thanks to everyone for their replies. Looks like 2.2 will help with this issue. I'll look forward to it. As a matter of interest, my android phone (Nexus 4) was giving about the same frame rate as my desktop (60 fps) - only the Kindle Fire was appreciably slower (35 fps).

 

Ken