KDChartTernaryLineDiagram.cpp

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/****************************************************************************
**
** This file is part of the KD Chart library.
**
** SPDX-FileCopyrightText: 2001 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
**
** SPDX-License-Identifier: MIT
**
****************************************************************************/
 
#include "KDChartTernaryLineDiagram.h"
#include "KDChartTernaryLineDiagram_p.h"
 
#include <limits>
 
#include <QPainter>
 
#include <KDChartPaintContext.h>
 
#include "KDChartDataValueAttributes.h"
#include "KDChartLineAttributes.h"
#include "KDChartMarkerAttributes.h"
#include "KDChartPainterSaver_p.h"
#include "TernaryConstants.h"
#include "TernaryPoint.h"
 
using namespace KDChart;
 
#define d d_func()
 
TernaryLineDiagram::Private::Private()
    : AbstractTernaryDiagram::Private()
{
}
 
TernaryLineDiagram::TernaryLineDiagram(QWidget *parent,
                                       TernaryCoordinatePlane *plane)
    : AbstractTernaryDiagram(new Private(), parent, plane)
{
    init();
    setDatasetDimensionInternal(3); // the third column is implicit
 
    DataValueAttributes dataValueAttributes;
    dataValueAttributes.setVisible(true);
    MarkerAttributes markerAttributes;
    markerAttributes.setMarkerStyle(MarkerAttributes::MarkerCircle);
    markerAttributes.setVisible(true);
    dataValueAttributes.setMarkerAttributes(markerAttributes);
    attributesModel()->setDefaultForRole(
        KDChart::DataValueLabelAttributesRole,
        QVariant::fromValue(dataValueAttributes));
}
 
TernaryLineDiagram::~TernaryLineDiagram()
{
}
 
void TernaryLineDiagram::init()
{
}
 
void TernaryLineDiagram::resize(const QSizeF &area)
{
    Q_UNUSED(area);
}
 
void TernaryLineDiagram::paint(PaintContext *paintContext)
{
    d->reverseMapper.clear();
 
    d->paint(paintContext);
    // sanity checks:
    if (model() == nullptr)
        return;
 
    QPainter *p = paintContext->painter();
    PainterSaver s(p);
 
    auto *plane =
        ( TernaryCoordinatePlane * )paintContext->coordinatePlane();
    Q_ASSERT(plane);
 
    qreal x, y, z;
 
    // for some reason(?) TernaryPointDiagram is using per-diagram DVAs only:
    const DataValueAttributes attrs(dataValueAttributes());
 
    d->forgetAlreadyPaintedDataValues();
 
    int columnCount = model()->columnCount(rootIndex());
    QPointF start;
    for (int column = 0; column < columnCount; column += datasetDimension()) {
        int numrows = model()->rowCount(rootIndex());
        for (int row = 0; row < numrows; row++) {
            // see if there is data otherwise skip
            QModelIndex base = model()->index(row, column); // checked
            if (!model()->data(base).isNull()) {
                p->setPen(PrintingParameters::scalePen(pen(base)));
                p->setBrush(brush(base));
 
                // retrieve data
                x = qMax(model()->data(model()->index(row, column, rootIndex())).toReal(), // checked
                         ( qreal )0.0);
                y = qMax(model()->data(model()->index(row, column + 1, rootIndex())).toReal(), // checked
                         ( qreal )0.0);
                z = qMax(model()->data(model()->index(row, column + 2, rootIndex())).toReal(), // checked
                         ( qreal )0.0);
 
                qreal total = x + y + z;
                if (fabs(total) > 3 * std::numeric_limits<qreal>::epsilon()) {
                    TernaryPoint tPunkt(x / total, y / total);
                    QPointF diagramLocation = translate(tPunkt);
                    QPointF widgetLocation = plane->translate(diagramLocation);
 
                    if (row > 0) {
                        p->drawLine(start, widgetLocation);
                    }
                    paintMarker(p, model()->index(row, column, rootIndex()), widgetLocation); // checked
                    start = widgetLocation;
                    // retrieve text and data value attributes
                    // FIXME use data model DisplayRole text
                    QString text = tr("(%1, %2, %3)")
                                       .arg(x * 100, 0, 'f', 0)
                                       .arg(y * 100, 0, 'f', 0)
                                       .arg(z * 100, 0, 'f', 0);
                    d->paintDataValueText(p, attrs, widgetLocation, true, text, true);
                } else {
                    // ignore and do not paint this point, garbage data
                    qDebug() << "TernaryPointDiagram::paint: data point x/y/z:"
                             << x << "/" << y << "/" << z << "ignored, unusable.";
                }
            }
        }
    }
}
 
const QPair<QPointF, QPointF> TernaryLineDiagram::calculateDataBoundaries() const
{
    // this is a constant, because we defined it to be one:
    static QPair<QPointF, QPointF> Boundaries(
        TriangleBottomLeft,
        QPointF(TriangleBottomRight.x(), TriangleHeight));
    return Boundaries;
}