101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
#ifndef HISTOGRAMCHART_H
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#define HISTOGRAMCHART_H
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#include <cmath>
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#include <QQuickItem>
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#include <QtQuick/QQuickPaintedItem>
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#include <QColor>
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struct Statistics {
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qreal sum = 0;
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qreal sumSquares = 0;
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int count = 0;
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void add(qreal v) {
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sum += v;
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sumSquares += v*v;
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count++;
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}
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void clear() {
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sum = 0;
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sumSquares = 0;
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count = 0;
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}
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int getCount() const {
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return count;
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}
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qreal getMean() const {
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return sum / static_cast<qreal>(count);
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}
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qreal getStdDev() const {
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const qreal x = sumSquares / static_cast<qreal>(count);
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const qreal e = getMean();
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return std::sqrt(x - (e*e));
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}
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};
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class HistogramChart : public QQuickPaintedItem
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{
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Q_OBJECT
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Q_PROPERTY(QString name READ name WRITE setName)
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Q_PROPERTY(QColor color READ color WRITE setColor)
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Q_PROPERTY(qreal binWidth READ binWidth WRITE setBinWidth)
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Q_PROPERTY(qreal mean READ mean)
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Q_PROPERTY(qreal stdDev READ stdDev)
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Q_PROPERTY(int totalCount READ totalCount)
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Q_PROPERTY(qreal maxBinValue READ maxBinValue)
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public:
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HistogramChart(QQuickItem* parent = nullptr);
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QString name() const { return m_name; }
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void setName(const QString &name) { m_name = name; }
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QColor color() const { return m_color; }
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void setColor(const QColor& color) { m_color = color; }
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qreal binWidth() const { return _binWidth; }
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void setBinWidth(qreal newBinWidth) { _binWidth = newBinWidth; reset(); }
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qreal mean() const { return stats.getMean(); }
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qreal stdDev() const { return stats.getStdDev(); }
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int totalCount() const { return stats.getCount(); }
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qreal maxBinValue() const { return minValue + (maxBinIndex * binWidth()); }
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void paint(QPainter *painter);
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Q_INVOKABLE void pushData(qreal value);
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Q_INVOKABLE void clear(); // soft reset
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Q_INVOKABLE void reset(); // hard reset
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public:
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int numberOfBins() const;
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int binIndex(qreal value) const;
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private:
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QString m_name;
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QColor m_color;
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std::vector<int> _histogram;
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qreal _binWidth = 100;
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qreal minValue = std::numeric_limits<qreal>::quiet_NaN();
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qreal maxValue = std::numeric_limits<qreal>::quiet_NaN();
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size_t lastUpdatedBinIndex = 0;
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int maxBinCount = 0;
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int maxBinIndex = 0;
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// Satistics
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Statistics stats;
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};
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#endif // HISTOGRAMCHART_H
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