multidimensional array – simple maths stuff?

[Frank Mansfield]

just realised i never included the expression as it stands, sorry!

something like this, but without the unnecessary clunk…

if ( numKeys > 0 && time > key(numKeys).time) {
	//continue out
	keyframeTime = key(numKeys).time;
	offsetKeyframeTime = key(numKeys).time - framesToTime(1);
	framesMultiplier = timeToFrames(time - keyframeTime);
	endingPointsArray = thisProperty.points(keyframeTime);
	preEndingPointsArray = thisProperty.points(offsetKeyframeTime);
	endingInTangentsArray = thisProperty.inTangents(keyframeTime);
	preEndingInTangentsArray = thisProperty.inTangents(offsetKeyframeTime);
	endingOutTangentsArray = thisProperty.outTangents(keyframeTime);
	preEndingOutTangentsArray = thisProperty.outTangents(offsetKeyframeTime);
	pointsArray = [];
	inTangentsArray = [];
	outTangentsArray = [];
	for (i=0 ; i<endingPointsArray.length ; i++) {
		pointsArray[i] = endingPointsArray[i] + (framesMultiplier * ( endingPointsArray[i] - preEndingPointsArray[i] ));
		inTangentsArray[i] = endingInTangentsArray[i] + (framesMultiplier * ( endingInTangentsArray[i] - preEndingInTangentsArray[i] ));
		outTangentsArray[i] = endingOutTangentsArray[i] + (framesMultiplier * ( endingOutTangentsArray[i] - preEndingOutTangentsArray[i] ));
	}
	pathClosedState = thisProperty.isClosed();
	createPath( points = pointsArray , inTangents = inTangentsArray , outTangents = outTangentsArray , isClosed = pathClosedState);	
}
else value

[Filip Vandueren]

Hi Frank, al that’s needed is to change the last line into:

else { value }

1-line else statements are buggy in the new Javascript engine, so it’s best to avoid them.

But the code works for me as is

[Frank Mansfield]

Cheers Filip – I’ll switch that out, thanks for the heads-up!

What I was chasing up was whether there was a simpler way of subtracting/adding the multidimensional arrays together. Having to for-loop through seems a bit long-winded – I figured there might be a way of just subtracting one array from another? A sort of “sub (arr1 , arr2)” that works multi-dimensionally?

Thanks dude!
-f

[Filip Vandueren]

Oops, I think I misunderstood your question, Frank.

You already got it working with a for loop (I thought you were asking why your expression wasn’t working, but it was)

But you are wondering if there’s another way to work through these arrays.

Here’s a version that uses Array.map() and arrow functions to make manipulated copies of arrays:

if ( numKeys > 0 && time > key(numKeys).time) {
    //continue out
    keyframeTime = key(numKeys).time;
    offsetKeyframeTime = keyframeTime - framesToTime(1);
    framesMultiplier = timeToFrames(time - keyframeTime);
    pointsArray = thisProperty.points();
    deltaPoints = pointsArray.map( (el, ind) => sub(el,thisProperty.points(offsetKeyframeTime)[ind]) );
    inTangentsArray = thisProperty.inTangents();
    deltaInTangents = inTangentsArray.map( (el, ind) => sub(el,thisProperty.inTangents(offsetKeyframeTime)[ind]) );
    outTangentsArray = thisProperty.outTangents();
    deltaOutTangents = outTangentsArray.map( (el, ind) => sub(el,thisProperty.outTangents(offsetKeyframeTime)[ind]) );
    pointsArray = pointsArray.map( (el, ind) => el + mul(deltaPoints[ind],framesMultiplier));
    inTangentsArray = inTangentsArray.map( (el, ind) => el + mul(deltaInTangents[ind],framesMultiplier));
    outTangentsArray = outTangentsArray.map( (el, ind) => el + mul(deltaOutTangents[ind],framesMultiplier));
    pathClosedState = thisProperty.isClosed();
    createPath( points = pointsArray , inTangents = inTangentsArray , outTangents = outTangentsArray , isClosed = pathClosedState); 
} else {
    value;
}

[Frank Mansfield]

holey moley… 🙂

This is way above my pay-grade. I’ll be back in about 2 weeks after I’ve unpicked some of this madness!

Thanks, Filip, that’s brilliant, cheers
-f