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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