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