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QwtPlotMagnifier(3) Qwt User's Guide QwtPlotMagnifier(3)

NAME

QwtPlotMagnifier -

SYNOPSIS

#include <qwt_plot_magnifier.h>

Inherits QwtMagnifier.

Public Member Functions


QwtPlotMagnifier (QwtPlotCanvas *)
virtual ~QwtPlotMagnifier ()
QwtPlotCanvas * canvas ()
const QwtPlotCanvas * canvas () const
bool isAxisEnabled (int axis) const
QwtPlot * plot ()
const QwtPlot * plot () const
void setAxisEnabled (int axis, bool on)

Protected Member Functions


virtual void rescale (double factor)

Detailed Description

QwtPlotMagnifier provides zooming, by magnifying in steps.

Using QwtPlotMagnifier a plot can be zoomed in/out in steps using keys, the mouse wheel or moving a mouse button in vertical direction.

Together with QwtPlotZoomer and QwtPlotPanner it is possible to implement individual and powerful navigation of the plot canvas.

See also:

QwtPlotZoomer, QwtPlotPanner, QwtPlot

Constructor & Destructor Documentation

QwtPlotMagnifier::QwtPlotMagnifier (QwtPlotCanvas *canvas) [explicit]

Constructor

Parameters:

canvas Plot canvas to be magnified

Member Function Documentation

bool QwtPlotMagnifier::isAxisEnabled (intaxis) const

Test if an axis is enabled

Parameters:

axis Axis, see QwtPlot::Axis

Returns:

True, if the axis is enabled

See also:

setAxisEnabled()

void QwtPlotMagnifier::rescale (doublefactor) [protected], [virtual]

Zoom in/out the axes scales

Parameters:

factor A value < 1.0 zooms in, a value > 1.0 zooms out.

Implements QwtMagnifier.

void QwtPlotMagnifier::setAxisEnabled (intaxis, boolon)

En/Disable an axis. Axes that are enabled will be synchronized to the result of panning. All other axes will remain unchanged.

Parameters:

axis Axis, see QwtPlot::Axis
on On/Off

See also:

isAxisEnabled()

Author

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Tue Nov 20 2012 Version 5.2.3