QwtPlotCanvasZoomState结构体 参考

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

#include <qwt_plot_canvas_zoomer.h>

Public 成员函数
	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

静态 Public 成员函数
static QwtPlotCanvasZoomState	fromPlot (QwtPlot *plot)
	Create a zoom state from the current axis ranges of a plot

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

详细描述

Struct that stores zoom states for all four axes

构造及析构函数说明

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

参数

[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

成员函数说明

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

参数

[in]

p

Plot widget to capture axis ranges from

返回

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

返回

true if the zoom state has an associated plot pointer

operator!=()

bool QwtPlotCanvasZoomState::operator!=

(

const QwtPlotCanvasZoomState &

other

)

const

Compare two zoom states for inequality

参数

[in]

other

Another zoom state to compare with

返回

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

参数

[in]

other

Another zoom state to compare with

返回

true if both states have the same plot and axis intervals

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该结构体的文档由以下文件生成:

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