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examples/refreshtest/CircularBuffer.h

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#pragma once
+
+#include <QwtSeriesData>
+#include <QVector>
+
+class CircularBuffer : public QwtSeriesData< QPointF >
+{
+  public:
+    CircularBuffer( double interval = 10.0, size_t numPoints = 1000 );
+    void fill( double interval, size_t numPoints );
+
+    void setReferenceTime( double );
+    double referenceTime() const;
+
+    virtual size_t size() const QWT_OVERRIDE;
+    virtual QPointF sample( size_t index ) const QWT_OVERRIDE;
+
+    virtual QRectF boundingRect() const QWT_OVERRIDE;
+
+    void setFunction( double ( * y )( double ) );
+
+  private:
+    double ( * m_y )( double );
+
+    double m_referenceTime;
+    double m_interval;
+    QVector< double > m_values;
+
+    double m_step;
+    int m_startIndex;
+    double m_offset;
+};