Ok - i needed variable speed per frame (so animation keeps in time with
possible frame lag) .
I guess where I get confused is:
how would i structure this if I wanted the follower to for example follow the
mouse (with an eased delay)?…
Here is the code for now ( which is currently not really adjusting for frame
delay / variable speed )
private function enterFrame( event : Event ) : void {
// Update Time
dt = 0.001 * (getTimer() - t0);
time += dt;
//----------------------------------------------------------------------------
// TIME CORRECTED
var lSpeedPerSecond : Number = 30;
var lSpeedPerFrameVariable : Number = lSpeedPerSecond * dt;
var targetX : Number = ( ( spc.x -
stage.mouseX ) / lSpeedPerSecond );
spc.x -= targetX;
if ( 0 > spc.x|| ( spc.x + spc.width ) > stage.stageWidth ) spcDir =
-spcDir;
t0 = getTimer();
}
Karim Beyrouti
t: +44 (0) 7977 997 629
e: [email protected]
w: http://kurst.co.uk
skype: karimbeyrouti
109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND
On 26 Oct 2012, at 17:07, Hans Wichman wrote:
> Hi Karim,
>
> i put them both in there, the one you are referring to is simpler:
> ofcourse this value can be kept out of the enterframe loop, i have a utility
> class for it (although it is a bit overkill;))
>
> private function enterFrame( event : Event ) : void {
> sp.x += speed * spDir;
> if ( 0 > sp.x|| ( sp.x + sp.width ) > stage.stageWidth ) spDir =
> -spDir;
>
> var lSpeedPerSecond:Number = 300;
> var lSpeedPerFrameConstant:Number = lSpeedPerSecond /
> stage.frameRate;
>
> spc.x += lSpeedPerFrameConstant* spcDir;
>
> if ( 0 > spc.x|| ( spc.x + spc.width ) > stage.stageWidth ) spcDir
> = -spcDir;
>
> t0 = getTimer();
> }
>
> Anyway, basically frameindependent value is simply
> SPEED_PER_SECOND/FRAMES_PER_SECOND.
>
> regards
> Hans
>
>
> On 26-10-2012 16:58, Karim Beyrouti wrote:
>>> are you trying to do frame rate independent animation based on a fixed
>>> frame rate (eg you switch from 30 to 60 and everything should move at the
>>> same pace but more fluid
>> Yep - that is the one… all my game physics is independent of framerate (time
>> based)… however, I am trying to get other non-physics based animated
>> objects/code
>> to work the same way (i.e. the camera), and I am finding it a little
>> difficult.
>>
>> Will try your solution - although it looks like it's for the other option
>> (variable framerate)….
>>
>> Thank you for helping….
>>
>>
>>
>> Karim Beyrouti
>>
>> t: +44 (0) 7977 997 629
>> e: [email protected]
>> w: http://kurst.co.uk
>> skype: karimbeyrouti
>>
>> 109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND
>>
>> On 26 Oct 2012, at 15:21, Hans Wichman wrote:
>>
>>> Hi,
>>>
>>> are you trying to do frame rate independent animation based on a fixed
>>> frame rate (eg you switch from 30 to 60 and everything should move at the
>>> same pace but more fluid), or trying to make up a variable framerate due to
>>> running code?
>>>
>>> Anyway since you are keeping y constant I compressed the code a bit, is
>>> this what you are looking for?
>>>
>>> private function enterFrame( event : Event ) : void {
>>> sp.x += speed * spDir;
>>> if ( 0 > sp.x|| ( sp.x + sp.width ) > stage.stageWidth ) spDir =
>>> -spDir;
>>>
>>> var lSpeedPerSecond:Number = 300;
>>> var lSpeedPerFrameConstant:Number = lSpeedPerSecond /
>>> stage.frameRate;
>>> var lSpeedPerFrameVariable:Number = lSpeedPerSecond *
>>> (getTimer()-t0)/1000;
>>>
>>> spc.x += lSpeedPerFrameConstant* spcDir;
>>> //spc.x += lSpeedPerFrameVariable * spcDir;
>>>
>>> if ( 0 > spc.x|| ( spc.x + spc.width ) > stage.stageWidth )
>>> spcDir = -spcDir;
>>>
>>> t0 = getTimer();
>>> }
>>>
>>> hth
>>> jc
>>>
>>>
>>> On 26-10-2012 15:29, Karim Beyrouti wrote:
>>>> Hello Flash coders,
>>>>
>>>> It's been a little quite here of late… So, hope it's good with with you
>>>> all. … I have been trying to figure this out for a day or so, and
>>>> wondering if you can help. I am trying to time correct my animation to be
>>>> independent of framerate, which is a little easier when dealing with
>>>> physics (scaling velocity / position) than non physics animation… In my
>>>> app physics is time corrected, however I have some code that is not
>>>> physics based an am trying to have that running independently of framerate
>>>> (and not really succeding).
>>>>
>>>> In the following demo:
>>>> http://kurst.co.uk/transfer/timecorrection/TimeCorrection.swf
>>>>
>>>> I have two rects ( green and red ). The green one is being time corrected,
>>>> and I would expect it to follow the red one ( as there is no lag in
>>>> framerate )… however as you can see - it's not
>>>> really working.
>>>>
>>>> Using the following formula to correct it:
>>>>
>>>> var spcTargetPosition : Point = new Point()
>>>> spcTargetPosition.x = ( spc.x + ( spc.x + 10 ) ) * speed * spcDir;
>>>> spcTargetPosition.y = spc.y;
>>>>
>>>> dt = 0.001 * (getTimer() - t0);
>>>> time += dt;
>>>> t0 = getTimer();
>>>>
>>>> spc.x = spc.x + ( dt * spcTargetPosition.x );
>>>>
>>>>
>>>> Here is the full code:
>>>> http://kurst.co.uk/transfer/timecorrection/TimeCorrection.as
>>>> I would love it if you can point out where I am going wrong...
>>>>
>>>>
>>>> Best regards
>>>>
>>>>
>>>> Karim Beyrouti
>>>>
>>>> t: +44 (0) 7977 997 629
>>>> e: [email protected]
>>>> w: http://kurst.co.uk
>>>> skype: karimbeyrouti
>>>>
>>>> 109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND
>>>>
>>>>
>>>> Karim Beyrouti
>>>>
>>>> t: +44 (0) 7977 997 629
>>>> e: [email protected]
>>>> w: http://kurst.co.uk
>>>> skype: karimbeyrouti
>>>>
>>>> 109 Timber Yard, Drysdale Street, Hoxton, London, N1 6ND
>>>>
>>>> _______________________________________________
>>>> Flashcoders mailing list
>>>> [email protected]
>>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>>> _______________________________________________
>>> Flashcoders mailing list
>>> [email protected]
>>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>> _______________________________________________
>> Flashcoders mailing list
>> [email protected]
>> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
>
> _______________________________________________
> Flashcoders mailing list
> [email protected]
> http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
_______________________________________________
Flashcoders mailing list
[email protected]
http://chattyfig.figleaf.com/mailman/listinfo/flashcoders
