interval is Ok, quick fix:
var MouseX;
var MouseY;
setInterval( determineVelocity, 20 );
function determineVelocity():Void
{
var newMouseX:Number = _root._xmouse;
var newMouseY:Number = _root._ymouse;
var deltaX = Math.abs(MouseX - newMouseX)
var deltaY = Math.abs(MouseY - newMouseY)
var dist = Math.sqrt((deltaX * deltaX) + (deltaY * deltaY))
velocity = dist*31; // 31 = fps
if (!isNaN(velocity) && velocity !=0) {
//trace( _root._xmouse + ", " +MouseX+ ", " + deltaX );
trace( Math.floor(velocity) + ", (" +deltaX+ ", " + deltaY +")");
}
MouseX = newMouseX;
MouseY = newMouseY;
};
----- Original Message -----
From: "Joshua Sera" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <flashcoders@chattyfig.figleaf.com>
Sent: Thursday, June 21, 2007 1:37 PM
Subject: Re: [Flashcoders] Mouse Velocity?
Well yeah. If you're doing a verlet integration-style
thing where all you store about a particle is it's
last position, and it's current position, and you're
not using a constant time step, you have to do that.
Storing the last 5 updates is a seperate thing.
This is just to overcome the difference in time
between the interval firing and the mouse moving. If
the mouse is updated every 10 milliseconds, and your
interval fires every 7, you're going to get intervals
where the mouse position hasn't changed.
The solutions, really, are to slow down your interval,
or just average things.
--- Ron Wheeler <[EMAIL PROTECTED]>
wrote:
Would you not eliminate the whole problem by keeping
track of the time
that the previous position was taken along with its
coordinates and use
that to calculate the time between the readings and
divide that into the
distance?
Then you do not care if the set interval or on enter
frame come at
equally spaced intervals.
Ron
Joshua Sera wrote:
> It's indeed a setInterval problem, as the interval
and
> mouse movement won't necessarily match up.
>
> onMouseMove can also be a problem, as you'll wind
up
> with a lot of readings going straight
> up/down/right/left, rather than in the direction
> you're moving.
>
> What I've done for this problem is to average the
> mouse movement over 5 or so updates to get a more
> accurate reading. Demo here:
>
> http://www.yourmomsa.com/springexp/springexp2.swf
>
> Pick the guy up by the wheel to toss him.
>
>
> --- "eric e. dolecki" <[EMAIL PROTECTED]> wrote:
>
>
>> I am calculating mouse velocity, but every now
and
>> then you get a 0 for
>> velocity eventhough its not 0 (setInterval prob I
>> suspect). Any better
>> approach?
>>
>> var MouseX;
>> var MouseY;
>>
>> function determineVelocity():Void
>> {
>> MouseX = _root._xmouse
>> MouseY = _root._ymouse
>> setTimeout( calc, 9 );
>> };
>>
>> setInterval( determineVelocity, 20 );
>>
>> function calc():Void
>> {
>> var newMouseX:Number = _root._xmouse;
>> var newMouseY:Number = _root._ymouse;
>>
>> var deltaX = Math.abs(MouseX - newMouseX)
>> deltaY = Math.abs(MouseY - newMouseY)
>> dist = Math.sqrt((deltaX * deltaX) + (deltaY
*
>> deltaY))
>> velocity = dist*31; // 31 = fps
>> trace( velocity );
>> };
>> _______________________________________________
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>> To change your subscription options or search the
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http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
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>> http://training.figleaf.com
>>
>>
>
>
>
>
>
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