QwtPlotCanvasZoomState Struct Reference

Struct that stores zoom states for all four axes. More...

#include <qwt_plot_canvas_zoomer.h>

Public Member Functions
	QwtPlotCanvasZoomState ()
	Default constructor creating an invalid zoom state.
	QwtPlotCanvasZoomState (QwtPlot *p, const QwtInterval &yLeft, const QwtInterval &yRight, const QwtInterval &xBottom, const QwtInterval &xTop)
	Constructor creating a zoom state with specified axis intervals.
void	apply () const
	Apply this zoom state to the associated plot.
bool	operator== (const QwtPlotCanvasZoomState &other) const
	Compare two zoom states for equality.
bool	operator!= (const QwtPlotCanvasZoomState &other) const
	Compare two zoom states for inequality.
bool	isValid () const
	Check if this zoom state is valid.

Static Public Member Functions
static QwtPlotCanvasZoomState	fromPlot (QwtPlot *plot)
	Create a zoom state from the current axis ranges of a plot.

Public Attributes
QPointer< QwtPlot >	plot
QwtInterval	axisInterval [QwtAxis::AxisPositions]

Detailed Description

Struct that stores zoom states for all four axes.

Constructor & Destructor Documentation

QwtPlotCanvasZoomState()

QwtPlotCanvasZoomState::QwtPlotCanvasZoomState	(	QwtPlot *	p,
		const QwtInterval &	yLeft,
		const QwtInterval &	yRight,
		const QwtInterval &	xBottom,
		const QwtInterval &	xTop
	)

Constructor creating a zoom state with specified axis intervals.

Parameters

[in]	p	Plot widget associated with this zoom state
[in]	yLeft	Interval for the left Y axis
[in]	yRight	Interval for the right Y axis
[in]	xBottom	Interval for the bottom X axis
[in]	xTop	Interval for the top X axis

Member Function Documentation

apply()

void QwtPlotCanvasZoomState::apply

(

)

const

Apply this zoom state to the associated plot.

Sets all four axis scales to the intervals stored in this zoom state. Does nothing if the plot pointer is null.

fromPlot()

QwtPlotCanvasZoomState QwtPlotCanvasZoomState::fromPlot ( QwtPlot *  p )

static

Create a zoom state from the current axis ranges of a plot.

Parameters

[in]

p

Plot widget to capture axis ranges from

Returns

QwtPlotCanvasZoomState containing current axis intervals

This static method captures the current scale divisions of all four axes from the given plot and stores them in a new zoom state object.

isValid()

bool QwtPlotCanvasZoomState::isValid

(

)

const

Check if this zoom state is valid.

Returns

true if the zoom state has an associated plot pointer

operator!=()

bool QwtPlotCanvasZoomState::operator!=

(

const QwtPlotCanvasZoomState &

other

)

const

Compare two zoom states for inequality.

Parameters

[in]

other

Another zoom state to compare with

Returns

true if the states differ in plot or any axis interval

operator==()

bool QwtPlotCanvasZoomState::operator==

(

const QwtPlotCanvasZoomState &

other

)

const

Compare two zoom states for equality.

Parameters

[in]

other

Another zoom state to compare with

Returns

true if both states have the same plot and axis intervals

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The documentation for this struct was generated from the following files:

• /home/runner/work/QWT/QWT/src/plot/qwt_plot_canvas_zoomer.h
• /home/runner/work/QWT/QWT/src/plot/qwt_plot_canvas_zoomer.cpp