Method initializeTransform

src/domain/UBGraphicsDelegateFrame.cpp:225–276

void UBGraphicsDelegateFrame::initializeTransform()
{
    QTransform itemTransform = delegated()->sceneTransform();
    QRectF itemRect = delegated()->boundingRect();
    QPointF topLeft = itemTransform.map(itemRect.topLeft());
    QPointF topRight = itemTransform.map(itemRect.topRight());
    QPointF  bottomLeft = itemTransform.map(itemRect.bottomLeft());

    qreal horizontalFlip = (topLeft.x() > topRight.x()) ? -1 : 1;
    mMirrorX = horizontalFlip < 0 ;
    if(horizontalFlip < 0){
        // why this is because of the way of calculating the translations that checks which side is the most is the
        // nearest instead of checking which one is the left side.
        QPointF tmp = topLeft;
        topLeft = topRight;
        topRight = tmp;

        // because of the calculation of the height is done by lenght and not deltaY
        bottomLeft = itemTransform.map(itemRect.bottomRight());
    }

    qreal verticalFlip = (bottomLeft.y() < topLeft.y()) ? -1 : 1;
    // not sure that is usefull
    mMirrorY = verticalFlip < 0;
    if(verticalFlip < 0 && !mMirrorX){
        topLeft = itemTransform.map(itemRect.bottomLeft());
        topRight = itemTransform.map(itemRect.bottomRight());
        bottomLeft = itemTransform.map(itemRect.topLeft());
    }

    QLineF topLine(topLeft, topRight);
    QLineF leftLine(topLeft, bottomLeft);
    qreal width = topLine.length();
    qreal height = leftLine.length();

    mAngle = topLine.angle();

    // the fact the the length is used we loose the horizontalFlip information
    // a better way to do this is using DeltaX that preserve the direction information.
    mTotalScaleX = (width / itemRect.width()) * horizontalFlip;
    mTotalScaleY = height / itemRect.height() * verticalFlip;

    QTransform tr;
    QPointF center = delegated()->boundingRect().center();
    tr.translate(center.x() * mTotalScaleX, center.y() * mTotalScaleY);
    tr.rotate(-mAngle);
    tr.translate(-center.x() * mTotalScaleX, -center.y() * mTotalScaleY);
    tr.scale(mTotalScaleX, mTotalScaleY);

    mTotalTranslateX = delegated()->transform().dx() - tr.dx();
    mTotalTranslateY = delegated()->transform().dy() - tr.dy();
}


void UBGraphicsDelegateFrame::mousePressEvent(QGraphicsSceneMouseEvent *event)