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  1. Qt
  2. QTBUG-57594

Items positions are not aligned to whole pixel

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      According to the documentations:

      anchors.alignWhenCentered (default true) forces centered anchors to align to a whole pixel; if the item being centered has an odd width or height, the item will be positioned on a whole pixel rather than being placed on a half-pixel.


      When width and height is real and not integer, center anchors are used, the y, x are still real, despite of anchors.alignWhenCentered is being by default true.

      Possible cause of this can be, that in Qt/5.7/Src/qtdeclarative/src/quick/items/qquickanchors.cpp 

      static inline qreal hcenter(const QQuickItem *item)
{
    qreal width = readWidth(item);
    if (QQuickAnchors *anchors = QQuickItemPrivate::get(item)->_anchors) {
        if (!QQuickAnchorsPrivate::get(anchors)->centerAligned)
            return width / 2;
    }
    int iw = width;
    if (iw % 2)
        return (width + 1) / 2;
    else
        return width / 2;
}

static inline qreal vcenter(const QQuickItem *item)
{
    qreal height = readHeight(item);
    if (QQuickAnchors *anchors = QQuickItemPrivate::get(item)->_anchors) {
        if (!QQuickAnchorsPrivate::get(anchors)->centerAligned)
            return height / 2;
    }
    int ih = height;
    if (ih % 2)
        return (height + 1) / 2;
    else
        return height / 2;
}

      the result value is not rounded.

        1. rectAnchor-2.qml
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          Karim Pinter
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            srutledg Shawn Rutledge
            karimpinter Karim Pinter
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              Created:
              Updated:

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