Some noob questions...

pixeldublu

Can someone help me out on how i can make an x animation gradually incrase or decrase speed

selim

I'm not entirely sure what you mean by 'x animation' if you mean an horizontal animation I'm afraid there isn't really a way to change its speed. What you need is to define many animations with a different rate. Then you can use setAnimation to change from one to the other.

pixeldublu

To be more specific i want to do a small racing game and for now i did this when you press a button:
$("#car").x(-3, true);
but its too instant and i want to make it more fluid, gradually incrase from 0 to -3.
Eventually i want to make it to shift gears later so will be 5-6 different speed variations and changes between them have to be smooth :)
No way in setting the duration of change ?

Thanks for the fast answer.

blackhawx

use javascript to setup a variable that increments over time, then assign that variable to your speed.

pixeldublu

These days got back to this project, managed to make the animation fluid, accelerate and decelerate on relase.

Currently the background moves also and got into a problem, i need to make the background repeat forever...

Anyway to make .addTilemap repeat tile horizontally ?

Thanks.

selim

If you want to create a background that repeats forever you shouldn't use tile-maps but simply an image.

There are two possible approaches:

1. Use two sprites and move them like explained in the tutorial (http://gamequeryjs.com/documentation/first-tutorial/first-tutorial-step-1/#background)


2. Use one image where you shift the background position over time

pixeldublu

Thanks for the answer, i will read and try.

Meanwhile i am thinking how to be able to reproduce car engine sound on button press. Found some swf audio pitch but will see if that will do the job.

pixeldublu

is there a way to track only a single press of a button ? I want keyTracker to only count one button press...

selim

keyTracker allows you to access (poll) the state of the keyboard in a callback function. There is almost no performance cost by having it tracking all the keys at once. To read the state of a given key you can simply access the right position in the keyTracker array.

If what you want is to execute a function once a key is pressed then you should use the keydown (or keyup) event handler. There too you will get an event for all of the keys and would have to filter the key you're interested in.

Which one of those two solution you choose depend on may factor but basically:

• If you want to detect a continuous pressing of a key (like for moving the player around, accelerating a car and so on) then you're better of with the keyTracker


• If you want to detect a timed input (like shooting a gun, jumping ...) then you will probably use the event handler.