That’s correct, the floating point values are either 0 or .5.
I am digging into this because a) it’s offered so why not use it, and b)
because I am seeing a little jitter in my pencil drawing and trying to
eliminate all causes for error.
> On Mar 18, 2017, at 8:56 PM, Ch'Gans <chg...@gna.org> wrote:
>
> On 19 March 2017 at 15:59, Patrick Stinson <patrickk...@gmail.com> wrote:
>> UITouch coordinates are floating point on iOS, for example for the Apple
>> Pencil. Is there a way to map this? Seems like this would be easy to
>> implement based on the QPoint version…
>>
>
> In which coordinate system are the UITouch points expressed in? Seems
> odd to use floating point for a pixel based CS, unless half pixels
> exist (high res display?)
>
> Chris
>
>> // pks: apple pencil
>> QPointF QGraphicsView::mapToScene(const QPointF &point) const
>> {
>> Q_D(const QGraphicsView);
>> QPointF p = point;
>> p.rx() += d->horizontalScroll();
>> p.ry() += d->verticalScroll();
>> return d->identityMatrix ? p : d->matrix.inverted().map(p);
>> }
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