KDChartStockDiagram.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 "KDChartStockDiagram.h"
#include "KDChartStockDiagram_p.h"
 
#include "KDChartPaintContext.h"
#include "KDChartPainterSaver_p.h"
 
using namespace KDChart;
 
#define d d_func()
 
StockDiagram::StockDiagram(QWidget *parent, CartesianCoordinatePlane *plane)
    : AbstractCartesianDiagram(new Private(), parent, plane)
{
    init();
}
 
StockDiagram::~StockDiagram()
{
}
 
void StockDiagram::init()
{
    d->diagram = this;
    d->compressor.setModel(attributesModel());
 
    // Set properties to defaults
    d->type = HighLowClose;
    d->upTrendCandlestickBrush = QBrush(Qt::white);
    d->downTrendCandlestickBrush = QBrush(Qt::black);
    d->upTrendCandlestickPen = QPen(Qt::black);
    d->downTrendCandlestickPen = QPen(Qt::black);
 
    d->lowHighLinePen = QPen(Qt::black);
    setDatasetDimensionInternal(3);
    // setDatasetDimension( 3 );
 
    setPen(QPen(Qt::black));
}
 
void StockDiagram::setType(Type type)
{
    d->type = type;
    Q_EMIT propertiesChanged();
}
 
StockDiagram::Type StockDiagram::type() const
{
    return d->type;
}
 
void StockDiagram::setStockBarAttributes(const StockBarAttributes &attr)
{
    attributesModel()->setModelData(
        QVariant::fromValue(attr),
        StockBarAttributesRole);
    Q_EMIT propertiesChanged();
}
 
StockBarAttributes StockDiagram::stockBarAttributes() const
{
    return attributesModel()->modelData(StockBarAttributesRole).value<StockBarAttributes>();
}
 
void StockDiagram::setStockBarAttributes(int column, const StockBarAttributes &attr)
{
    d->setDatasetAttrs(column, QVariant::fromValue(attr), StockBarAttributesRole);
    Q_EMIT propertiesChanged();
}
 
StockBarAttributes StockDiagram::stockBarAttributes(int column) const
{
    const QVariant attr(d->datasetAttrs(column, StockBarAttributesRole));
    if (attr.isValid())
        return attr.value<StockBarAttributes>();
    return stockBarAttributes();
}
 
void StockDiagram::setThreeDBarAttributes(const ThreeDBarAttributes &attr)
{
    attributesModel()->setModelData(
        QVariant::fromValue(attr),
        ThreeDBarAttributesRole);
    Q_EMIT propertiesChanged();
}
 
ThreeDBarAttributes StockDiagram::threeDBarAttributes() const
{
    return attributesModel()->modelData(ThreeDBarAttributesRole).value<ThreeDBarAttributes>();
}
 
void StockDiagram::setThreeDBarAttributes(int column, const ThreeDBarAttributes &attr)
{
    d->setDatasetAttrs(column, QVariant::fromValue(attr), StockBarAttributesRole);
    Q_EMIT propertiesChanged();
}
 
ThreeDBarAttributes StockDiagram::threeDBarAttributes(int column) const
{
    const QVariant attr(d->datasetAttrs(column, ThreeDBarAttributesRole));
    if (attr.isValid())
        return attr.value<ThreeDBarAttributes>();
    return threeDBarAttributes();
}
 
void StockDiagram::setLowHighLinePen(const QPen &pen)
{
    d->lowHighLinePen = pen;
}
 
QPen StockDiagram::lowHighLinePen() const
{
    return d->lowHighLinePen;
}
 
void StockDiagram::setLowHighLinePen(int column, const QPen &pen)
{
    d->lowHighLinePens[column] = pen;
}
 
QPen StockDiagram::lowHighLinePen(int column) const
{
    if (d->lowHighLinePens.contains(column))
        return d->lowHighLinePens[column];
    return d->lowHighLinePen;
}
 
void StockDiagram::setUpTrendCandlestickBrush(const QBrush &brush)
{
    d->upTrendCandlestickBrush = brush;
}
 
QBrush StockDiagram::upTrendCandlestickBrush() const
{
    return d->upTrendCandlestickBrush;
}
 
void StockDiagram::setDownTrendCandlestickBrush(const QBrush &brush)
{
    d->downTrendCandlestickBrush = brush;
}
 
QBrush StockDiagram::downTrendCandlestickBrush() const
{
    return d->downTrendCandlestickBrush;
}
 
void StockDiagram::setUpTrendCandlestickBrush(int column, const QBrush &brush)
{
    d->upTrendCandlestickBrushes[column] = brush;
}
 
QBrush StockDiagram::upTrendCandlestickBrush(int column) const
{
    if (d->upTrendCandlestickBrushes.contains(column))
        return d->upTrendCandlestickBrushes[column];
    return d->upTrendCandlestickBrush;
}
 
void StockDiagram::setDownTrendCandlestickBrush(int column, const QBrush &brush)
{
    d->downTrendCandlestickBrushes[column] = brush;
}
 
QBrush StockDiagram::downTrendCandlestickBrush(int column) const
{
    if (d->downTrendCandlestickBrushes.contains(column))
        return d->downTrendCandlestickBrushes[column];
    return d->downTrendCandlestickBrush;
}
 
void StockDiagram::setUpTrendCandlestickPen(const QPen &pen)
{
    d->upTrendCandlestickPen = pen;
}
 
QPen StockDiagram::upTrendCandlestickPen() const
{
    return d->upTrendCandlestickPen;
}
 
void StockDiagram::setDownTrendCandlestickPen(const QPen &pen)
{
    d->downTrendCandlestickPen = pen;
}
 
QPen StockDiagram::downTrendCandlestickPen() const
{
    return d->downTrendCandlestickPen;
}
 
void StockDiagram::setUpTrendCandlestickPen(int column, const QPen &pen)
{
    d->upTrendCandlestickPens[column] = pen;
}
 
QPen StockDiagram::upTrendCandlestickPen(int column) const
{
    if (d->upTrendCandlestickPens.contains(column))
        return d->upTrendCandlestickPens[column];
    return d->upTrendCandlestickPen;
}
 
void StockDiagram::setDownTrendCandlestickPen(int column, const QPen &pen)
{
    d->downTrendCandlestickPens[column] = pen;
}
 
QPen StockDiagram::downTrendCandlestickPen(int column) const
{
    if (d->downTrendCandlestickPens.contains(column))
        return d->downTrendCandlestickPens[column];
    return d->downTrendCandlestickPen;
}
 
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) && defined(Q_COMPILER_MANGLES_RETURN_TYPE)
const
#endif
    int
    StockDiagram::numberOfAbscissaSegments() const
{
    return 1;
}
 
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) && defined(Q_COMPILER_MANGLES_RETURN_TYPE)
const
#endif
    int
    StockDiagram::numberOfOrdinateSegments() const
{
    return 1;
}
 
void StockDiagram::paint(PaintContext *context)
{
    // Clear old reverse mapping data and create new
    // reverse mapping scene
    d->reverseMapper.clear();
 
    PainterSaver painterSaver(context->painter());
    const int rowCount = attributesModel()->rowCount(attributesModelRootIndex());
    const int divisor = (d->type == OpenHighLowClose || d->type == Candlestick) ? 4 : 3;
    const int colCount = attributesModel()->columnCount(attributesModelRootIndex()) / divisor;
    for (int col = 0; col < colCount; ++col) {
        for (int row = 0; row < rowCount; row++) {
            CartesianDiagramDataCompressor::DataPoint low;
            CartesianDiagramDataCompressor::DataPoint high;
            CartesianDiagramDataCompressor::DataPoint open;
            CartesianDiagramDataCompressor::DataPoint close;
            CartesianDiagramDataCompressor::DataPoint volume;
 
            if (d->type == HighLowClose) {
                const CartesianDiagramDataCompressor::CachePosition highPos(row, col * divisor);
                const CartesianDiagramDataCompressor::CachePosition lowPos(row, col * divisor + 1);
                const CartesianDiagramDataCompressor::CachePosition closePos(row, col * divisor + 2);
                low = d->compressor.data(lowPos);
                high = d->compressor.data(highPos);
                close = d->compressor.data(closePos);
            } else if (d->type == OpenHighLowClose || d->type == Candlestick) {
                const CartesianDiagramDataCompressor::CachePosition openPos(row, col * divisor);
                const CartesianDiagramDataCompressor::CachePosition highPos(row, col * divisor + 1);
                const CartesianDiagramDataCompressor::CachePosition lowPos(row, col * divisor + 2);
                const CartesianDiagramDataCompressor::CachePosition closePos(row, col * divisor + 3);
                open = d->compressor.data(openPos);
                low = d->compressor.data(lowPos);
                high = d->compressor.data(highPos);
                close = d->compressor.data(closePos);
            }
 
            switch (d->type) {
            case HighLowClose:
                open.hidden = true;
                Q_FALLTHROUGH();
            case OpenHighLowClose:
                if (close.index.isValid() && low.index.isValid() && high.index.isValid())
                    d->drawOHLCBar(col, open, high, low, close, context);
                break;
            case Candlestick:
                d->drawCandlestick(col, open, high, low, close, context);
                break;
            }
        }
    }
}
 
void StockDiagram::resize(const QSizeF &size)
{
    d->compressor.setResolution(static_cast<int>(size.width() * coordinatePlane()->zoomFactorX()),
                                static_cast<int>(size.height() * coordinatePlane()->zoomFactorY()));
    setDataBoundariesDirty();
    QAbstractItemView::resize(size.toSize());
}
 
qreal StockDiagram::threeDItemDepth(int column) const
{
    Q_UNUSED(column);
    // FIXME: Implement threeD functionality
    return 1.0;
}
 
qreal StockDiagram::threeDItemDepth(const QModelIndex &index) const
{
    Q_UNUSED(index);
    // FIXME: Implement threeD functionality
    return 1.0;
}
 
const QPair<QPointF, QPointF> StockDiagram::calculateDataBoundaries() const
{
    const int rowCount = attributesModel()->rowCount(attributesModelRootIndex());
    const int colCount = attributesModel()->columnCount(attributesModelRootIndex());
    qreal xMin = 0.0;
    qreal xMax = rowCount;
    qreal yMin = 0.0;
    qreal yMax = 0.0;
    for (int row = 0; row < rowCount; row++) {
        for (int col = 0; col < colCount; col++) {
            const CartesianDiagramDataCompressor::CachePosition pos(row, col);
            const CartesianDiagramDataCompressor::DataPoint point = d->compressor.data(pos);
            yMax = qMax(yMax, point.value);
            yMin = qMin(yMin, point.value); // FIXME: Can stock charts really have negative values?
        }
    }
    return QPair<QPointF, QPointF>(QPointF(xMin, yMin), QPointF(xMax, yMax));
}