DiagramView.cpp

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#include "DiagramView.h"
 
#include <math.h>
 
#include <QGraphicsTextItem>
 
DiagramView::DiagramView(QWidget* parent) : QGraphicsView(parent)
{
    _scene = new DiagramScene();
    setScene(_scene);
    initialize();
}
 
DiagramView::DiagramView(DiagramList* list, QWidget* parent)
    : QGraphicsView(parent)
{
    _scene = new DiagramScene(list);
    setScene(_scene);
    initialize();
}
 
DiagramView::~DiagramView()
{
    delete _scene;
}
 
void DiagramView::addGraph(DiagramList* list)
{
    _scene->addGraph(list);
    update();
}
 
int DiagramView::getHeight()
{
    return static_cast<int>((_scene->itemsBoundingRect()).height());
}
 
int DiagramView::getWidth()
{
    return static_cast<int>((_scene->itemsBoundingRect()).width());
}

void DiagramView::initialize()
{
    // QMatrix currentMatrix = matrix();
    // setMatrix(currentMatrix * scene->getTransformationMatrix());
 
    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 
    update();
}
 
/*
 * Keeps the aspect ration of the labels when the view is resized.
 * It is only necessary to call this if
 *        Qt::AspectRatioMode == Qt::IgnoreAspectRatio.
 * Also, this method is kind of annoying because you have to set the
 * appropriate transform for every single QGraphicsTextItem separately.
 */
/*
   void DiagramView::keepItemAspectRatio()
   {
    double xFactor = transform().mapRect(QRectF(0, 0, 1, 1)).width();
    double yFactor = transform().mapRect(QRectF(0, 0, 1, 1)).height();
    QMatrix invertedScaling;
    invertedScaling.scale(1.0 , xFactor / yFactor);
 
    scene->xLabel->setTransform(QTransform(invertedScaling));
    scene->yLabel->setTransform(QTransform(invertedScaling));
    scene->yLabel->rotate(-90);
   }
 */
 
QSize DiagramView::minimumSizeHint() const
{
    return QSize(3 * DiagramScene::MARGIN, 2 * DiagramScene::MARGIN);
}
 
QSize DiagramView::sizeHint() const
{
    return QSize(6 * DiagramScene::MARGIN, 4 * DiagramScene::MARGIN);
}
 
void DiagramView::resizeEvent(QResizeEvent* event)
{
    Q_UNUSED(event)
    update();
    // keepItemAspectRatio();
}

void DiagramView::update()
{
    // setResizeAnchor(QGraphicsView::AnchorViewCenter);
    QRectF viewRect = _scene->itemsBoundingRect();
    _scene->setSceneRect(viewRect);
    QRectF sceneInView(0 /*_scene->MARGIN*/, DiagramScene::MARGIN / 2,
                       viewRect.width() /*+_scene->MARGIN*/,
                       viewRect.height() + DiagramScene::MARGIN);
    fitInView(sceneInView, Qt::IgnoreAspectRatio);
}