1 files changed, 143 insertions, 0 deletions
diff --git a/src/libpcp_qwt/src/qwt_plot_magnifier.cpp b/src/libpcp_qwt/src/qwt_plot_magnifier.cpp
new file mode 100644
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+++ b/src/libpcp_qwt/src/qwt_plot_magnifier.cpp
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+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#include "qwt_plot.h"
+#include "qwt_plot_canvas.h"
+#include "qwt_scale_div.h"
+#include "qwt_plot_magnifier.h"
+#include <qevent.h>
+
+class QwtPlotMagnifier::PrivateData
+{
+public:
+    PrivateData()
+    {
+        for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
+            isAxisEnabled[axis] = true;
+    }
+
+    bool isAxisEnabled[QwtPlot::axisCnt];
+};
+
+/*!
+   Constructor
+   \param canvas Plot canvas to be magnified
+*/
+QwtPlotMagnifier::QwtPlotMagnifier( QwtPlotCanvas *canvas ):
+    QwtMagnifier( canvas )
+{
+    d_data = new PrivateData();
+}
+
+//! Destructor
+QwtPlotMagnifier::~QwtPlotMagnifier()
+{
+    delete d_data;
+}
+
+/*!
+   \brief En/Disable an axis
+
+   Only Axes that are enabled will be zoomed.
+   All other axes will remain unchanged.
+
+   \param axis Axis, see QwtPlot::Axis
+   \param on On/Off
+
+   \sa isAxisEnabled()
+*/
+void QwtPlotMagnifier::setAxisEnabled( int axis, bool on )
+{
+    if ( axis >= 0 && axis < QwtPlot::axisCnt )
+        d_data->isAxisEnabled[axis] = on;
+}
+
+/*!
+   Test if an axis is enabled
+
+   \param axis Axis, see QwtPlot::Axis
+   \return True, if the axis is enabled
+
+   \sa setAxisEnabled()
+*/
+bool QwtPlotMagnifier::isAxisEnabled( int axis ) const
+{
+    if ( axis >= 0 && axis < QwtPlot::axisCnt )
+        return d_data->isAxisEnabled[axis];
+
+    return true;
+}
+
+//! Return observed plot canvas
+QwtPlotCanvas *QwtPlotMagnifier::canvas()
+{
+    return qobject_cast<QwtPlotCanvas *>( parent() );
+}
+
+//! Return Observed plot canvas
+const QwtPlotCanvas *QwtPlotMagnifier::canvas() const
+{
+    return qobject_cast<const QwtPlotCanvas *>( parent() );
+}
+
+//! Return plot widget, containing the observed plot canvas
+QwtPlot *QwtPlotMagnifier::plot()
+{
+    QwtPlotCanvas *w = canvas();
+    if ( w )
+        return w->plot();
+
+    return NULL;
+}
+
+//! Return plot widget, containing the observed plot canvas
+const QwtPlot *QwtPlotMagnifier::plot() const
+{
+    const QwtPlotCanvas *w = canvas();
+    if ( w )
+        return w->plot();
+
+    return NULL;
+}
+
+/*!
+   Zoom in/out the axes scales
+   \param factor A value < 1.0 zooms in, a value > 1.0 zooms out.
+*/
+void QwtPlotMagnifier::rescale( double factor )
+{
+    factor = qAbs( factor );
+    if ( factor == 1.0 || factor == 0.0 )
+        return;
+
+    bool doReplot = false;
+    QwtPlot* plt = plot();
+
+    const bool autoReplot = plt->autoReplot();
+    plt->setAutoReplot( false );
+
+    for ( int axisId = 0; axisId < QwtPlot::axisCnt; axisId++ )
+    {
+        const QwtScaleDiv *scaleDiv = plt->axisScaleDiv( axisId );
+        if ( isAxisEnabled( axisId ) && scaleDiv->isValid() )
+        {
+            const double center =
+                scaleDiv->lowerBound() + scaleDiv->range() / 2;
+            const double width_2 = scaleDiv->range() / 2 * factor;
+
+            plt->setAxisScale( axisId, center - width_2, center + width_2 );
+            doReplot = true;
+        }
+    }
+
+    plt->setAutoReplot( autoReplot );
+
+    if ( doReplot )
+        plt->replot();
+}