On Mon, 12 Dec 2022 16:51:01 GMT, Andy Goryachev <ango...@openjdk.org> wrote:
>> This includes a fix for the precision problem we've found as part of the
>> graphics warnings clean ups.
>>
>> I've included two commits, one with just the minimal fix, and one with the
>> clean ups. I can drop off the 2nd commit if it is deemed to be of no added
>> value.
>
> modules/javafx.graphics/src/main/java/com/sun/javafx/tk/quantum/RotateGestureRecognizer.java
> line 60:
>
>> 58: String s =
>> System.getProperty("com.sun.javafx.gestures.rotate.threshold");
>> 59: if (s != null) {
>> 60: rotationThresholdDegrees = Double.valueOf(s);
>
> should we catch a NumberFormatException and re-throw it with a meaningful
> text message? Or the current behavior is ok?
>
> ditto on line 64
I suppose that would be out of scope for this PR. I agree though that it would
be good to mention that the double that couldn't be parsed is the one we got
from `System.getProperty("com.sun.javafx.gestures.rotate.threshold")` as
otherwise the error would mean nothing to anyone.
> modules/javafx.graphics/src/main/java/com/sun/javafx/tk/quantum/ScrollGestureRecognizer.java
> line 252:
>
>> 250: factorX = deltaX / scrollMagnitude;
>> 251: factorY = deltaY / scrollMagnitude;
>> 252: initialInertiaScrollVelocity = scrollMagnitude
>> / nanosPassed * NANOS_TO_SECONDS;
>
> is this correct? shouldn't it be `scrollMagnitude / (nanosPassed *
> NANOS_TO_SECONDS)`?
I think it's correct, unless you have reason to believe why it wouldn't be.
`scrollMagnitude` is a double, and the division and multiplication that follow
it will be all done as doubles.
> modules/javafx.graphics/src/main/java/com/sun/javafx/tk/quantum/ZoomGestureRecognizer.java
> line 277:
>
>> 275:
>> 276: if (nanosPassed >
>> INITIAL_VELOCITY_THRESHOLD_NANOS) {
>> 277: initialInertiaZoomVelocity =
>> (totalZoomFactor - prevTotalZoomFactor) / nanosPassed * NANOS_TO_SECONDS;
>
> `(totalZoomFactor - prevTotalZoomFactor) / (nanosPassed * NANOS_TO_SECONDS);`
> ?
The order is irrelevant, it could as well be `((totalZoomFactor -
prevTotalZoomFactor) / nanosPassed) * NANOS_TO_SECONDS` -- I'll let the
compiler decide what is more optimal.
-------------
PR: https://git.openjdk.org/jfx/pull/966
