customformatter.cpp Example File

qmlaxisformatter/customformatter.cpp
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#include "customformatter.h" #include <QtDataVisualization/QValue3DAxis> #include <QtQml/QQmlExtensionPlugin> #include <QtCore/QDebug> using namespace QtDataVisualization; Q_DECLARE_METATYPE(QValue3DAxisFormatter *) static const qreal oneDayMs = 60.0 * 60.0 * 24.0 * 1000.0; CustomFormatter::CustomFormatter(QObject *parent) : QValue3DAxisFormatter(parent) { qRegisterMetaType<QValue3DAxisFormatter *>(); } CustomFormatter::~CustomFormatter() { } QValue3DAxisFormatter *CustomFormatter::createNewInstance() const { return new CustomFormatter(); } void CustomFormatter::populateCopy(QValue3DAxisFormatter &copy) const { QValue3DAxisFormatter::populateCopy(copy); CustomFormatter *customFormatter = static_cast<CustomFormatter *>(&copy); customFormatter->m_originDate = m_originDate; customFormatter->m_selectionFormat = m_selectionFormat; } void CustomFormatter::recalculate() { // We want our axis to always have gridlines at date breaks // Convert range into QDateTimes QDateTime minTime = valueToDateTime(qreal(axis()->min())); QDateTime maxTime = valueToDateTime(qreal(axis()->max())); // Find out the grid counts QTime midnight(0, 0); QDateTime minFullDate(minTime.date(), midnight); int gridCount = 0; if (minFullDate != minTime) minFullDate = minFullDate.addDays(1); QDateTime maxFullDate(maxTime.date(), midnight); gridCount += minFullDate.daysTo(maxFullDate) + 1; int subGridCount = axis()->subSegmentCount() - 1; // Reserve space for position arrays and label strings gridPositions().resize(gridCount); subGridPositions().resize((gridCount + 1) * subGridCount); labelPositions().resize(gridCount); labelStrings().reserve(gridCount); // Calculate positions and format labels qint64 startMs = minTime.toMSecsSinceEpoch(); qint64 endMs = maxTime.toMSecsSinceEpoch(); qreal dateNormalizer = endMs - startMs; qreal firstLineOffset = (minFullDate.toMSecsSinceEpoch() - startMs) / dateNormalizer; qreal segmentStep = oneDayMs / dateNormalizer; qreal subSegmentStep = 0; if (subGridCount > 0) subSegmentStep = segmentStep / qreal(subGridCount + 1); for (int i = 0; i < gridCount; i++) { qreal gridValue = firstLineOffset + (segmentStep * qreal(i)); gridPositions()[i] = float(gridValue); labelPositions()[i] = float(gridValue); labelStrings() << minFullDate.addDays(i).toString(axis()->labelFormat()); } for (int i = 0; i <= gridCount; i++) { if (subGridPositions().size()) { for (int j = 0; j < subGridCount; j++) { float position; if (i) position = gridPositions().at(i - 1) + subSegmentStep * (j + 1); else position = gridPositions().at(0) - segmentStep + subSegmentStep * (j + 1); if (position > 1.0f || position < 0.0f) position = gridPositions().at(0); subGridPositions()[i * subGridCount + j] = position; } } } } QString CustomFormatter::stringForValue(qreal value, const QString &format) const { Q_UNUSED(format) return valueToDateTime(value).toString(m_selectionFormat); } QDate CustomFormatter::originDate() const { return m_originDate; } QString CustomFormatter::selectionFormat() const { return m_selectionFormat; } void CustomFormatter::setOriginDate(const QDate &date) { if (m_originDate != date) { m_originDate = date; markDirty(true); emit originDateChanged(date); } } void CustomFormatter::setSelectionFormat(const QString &format) { if (m_selectionFormat != format) { m_selectionFormat = format; markDirty(true); // Necessary to regenerate already visible selection label emit selectionFormatChanged(format); } } QDateTime CustomFormatter::valueToDateTime(qreal value) const { return QDateTime(m_originDate).addMSecs(qint64(oneDayMs * value)); }