

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.
Definition at line 30 of file qwt_plot_magnifier.h.
Public Member Functions | |
| QwtPlotMagnifier (QwtPlotCanvas *) | |
| virtual | ~QwtPlotMagnifier () |
| void | setAxisEnabled (int axis, bool on) |
| bool | isAxisEnabled (int axis) const |
| QwtPlotCanvas * | canvas () |
| const QwtPlotCanvas * | canvas () const |
| QwtPlot * | plot () |
| const QwtPlot * | plot () const |
Protected Member Functions | |
| virtual void | rescale (double factor) |
| QwtPlotMagnifier::QwtPlotMagnifier | ( | QwtPlotCanvas * | canvas | ) | [explicit] |
Constructor
| canvas | Plot canvas to be magnified |
Definition at line 35 of file qwt_plot_magnifier.cpp.
| QwtPlotMagnifier::~QwtPlotMagnifier | ( | ) | [virtual] |
| void QwtPlotMagnifier::setAxisEnabled | ( | int | axis, | |
| bool | on | |||
| ) |
En/Disable an axis.
Axes that are enabled will be synchronized to the result of panning. All other axes will remain unchanged.
| axis | Axis, see QwtPlot::Axis | |
| on | On/Off |
Definition at line 58 of file qwt_plot_magnifier.cpp.
| bool QwtPlotMagnifier::isAxisEnabled | ( | int | axis | ) | const |
Test if an axis is enabled
| axis | Axis, see QwtPlot::Axis |
Definition at line 72 of file qwt_plot_magnifier.cpp.
Referenced by rescale().
| QwtPlotCanvas * QwtPlotMagnifier::canvas | ( | ) |
Return observed plot canvas.
Definition at line 81 of file qwt_plot_magnifier.cpp.
Referenced by plot().
| const QwtPlotCanvas * QwtPlotMagnifier::canvas | ( | ) | const |
| QwtPlot * QwtPlotMagnifier::plot | ( | ) |
Return plot widget, containing the observed plot canvas.
Definition at line 97 of file qwt_plot_magnifier.cpp.
References canvas().
Referenced by rescale().
| const QwtPlot * QwtPlotMagnifier::plot | ( | ) | const |
Return plot widget, containing the observed plot canvas.
Definition at line 111 of file qwt_plot_magnifier.cpp.
| void QwtPlotMagnifier::rescale | ( | double | factor | ) | [protected, virtual] |
Zoom in/out the axes scales
| factor | A value < 1.0 zooms in, a value > 1.0 zooms out. |
Implements QwtMagnifier.
Definition at line 120 of file qwt_plot_magnifier.cpp.
References QwtPlot::autoReplot(), QwtPlot::axisScaleDiv(), isAxisEnabled(), QwtScaleDiv::lBound(), plot(), QwtPlot::replot(), QwtPlot::setAutoReplot(), and QwtPlot::setAxisScale().
1.5.0