qgraphicsitemutility.cpp

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/*
    Copyright 2006-2019 The QElectroTech Team
    This file is part of QElectroTech.

    QElectroTech is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    QElectroTech is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "qgraphicsitemutility.h"
#include "element.h"
#include "diagram.h"
#include <QGraphicsItem>
#include <QDebug>

bool centerToParentBottom(QGraphicsItem *item) {
    if (! item->parentItem()) {
        qDebug() << "Qet::centerToParentBottom : item have not parent";
        return false;
    }

    QPointF p = item -> parentItem() -> boundingRect().center();
    p.ry() +=   item -> parentItem() -> boundingRect().height()/2;
    p.rx() -=  (item -> boundingRect().width()/2 + item->boundingRect().left()); //< we add boundingrect.left because this value can be négative

    item -> setPos(p);
    return true;
}

#include "elementtextitemgroup.h"
#include "crossrefitem.h"
bool centerToBottomDiagram (QGraphicsItem *item_to_center, Element *element_to_follow, qreal offset) {
    if (! element_to_follow -> diagram()) {
        qDebug() << "qgraphicsitemutility centerAtBottomDiagram : Element_to_follow have not diagram";
        return false;
    }
    
    QRectF  border = element_to_follow -> diagram() -> border_and_titleblock.insideBorderRect();
    QPointF point  = element_to_follow -> sceneBoundingRect().center();
    
    point.setY(border.bottom() - item_to_center -> boundingRect().height() - offset );
    point.rx() -= (item_to_center -> boundingRect().width()/2);
    
        //Apply the difference between the pos() of item and his bounding rect
    QPointF tl = item_to_center->boundingRect().topLeft();
    point.rx() -= tl.x();
    point.ry() -= tl.y();
    
    item_to_center -> setPos(0,0);    //Due to a weird behavior or bug, before set the new position and rotation,
    item_to_center -> setRotation(0); //we must to set the position and rotation at 0.
    
    item_to_center->setPos(item_to_center->mapFromScene(point));
    
    qreal rot = item_to_center->rotation();
    QGraphicsItem *parent = item_to_center->parentItem();
    while (parent) {
        rot += parent->rotation();
        parent = parent->parentItem();
    }
    if(rot != 0)
        item_to_center->setRotation(item_to_center->rotation() - rot);

    return true;
}