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playground/curvetracker/CurveTracker.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 <QwtPlotPicker>
+
+class QwtPlotCurve;
+class QLineF;
+
+class CurveTracker : public QwtPlotPicker
+{
+  public:
+    CurveTracker( QWidget* );
+
+  protected:
+    virtual QwtText trackerTextF( const QPointF& ) const QWT_OVERRIDE;
+    virtual QRect trackerRect( const QFont& ) const QWT_OVERRIDE;
+
+  private:
+    QString curveInfoAt( const QwtPlotCurve*, const QPointF& ) const;
+    QLineF curveLineAt( const QwtPlotCurve*, double x ) const;
+};