QwtPlotLayoutEngine::LayoutData类 参考

Data structure for layout calculation 更多...

#include <qwt_plot_layout_engine.h>

类
struct	CanvasData
	Data for canvas layout calculation 更多...
struct	LabelData
	Data for title/footer label layout calculation 更多...
struct	LegendData
	Data for legend layout calculation 更多...
struct	ScaleData
	Data for axis scale widget layout calculation 更多...

Public 类型
enum	Label { Title , Footer , NumLabels }
	Label type enumeration 更多...

Public 成员函数
	LayoutData (const QwtPlot *plot)
	Construct LayoutData from a QwtPlot
bool	hasSymmetricYAxes () const
	Check if Y axes are symmetric
ScaleData &	axisData (QwtAxisId axisId)
	Get scale data for a specific axis (mutable version)
const ScaleData &	axisData (QwtAxisId axisId) const
	Get scale data for a specific axis (const version)
double	tickOffset (int axisPos) const
	Get tick offset for a specific axis position

Public 属性
LegendData	legendData
LabelData	labelData [NumLabels]
CanvasData	canvasData
int	parasiteCaptionHeight [QwtAxis::AxisPositions]

详细描述

Data structure for layout calculation

Contains cached data extracted from plot components for efficient layout calculation.

成员枚举类型说明

Label

enum QwtPlotLayoutEngine::LayoutData::Label

Label type enumeration

Identifies title or footer labels in the layout.

枚举值
Title	Title label
Footer	Footer label
NumLabels	Number of label types

构造及析构函数说明

LayoutData()

QwtPlotLayoutEngine::LayoutData::LayoutData

(

const QwtPlot *

plot

)

Construct LayoutData from a QwtPlot

Initializes all layout data by extracting information from the plot's components including legend, labels, axes and canvas. For a host plot the outside title caption heights demanded by all parasite plots sharing its bands are aggregated as well, so that the host layout reserves enough space for the captions of every layer.

参数

plot	Pointer to the QwtPlot

成员函数说明

axisData() [1/2]

QwtPlotLayoutEngine::LayoutData::ScaleData & QwtPlotLayoutEngine::LayoutData::axisData

(

QwtAxisId

axisId

)

Get scale data for a specific axis (mutable version)

参数

axisId

Axis identifier

返回

Mutable reference to the scale data

axisData() [2/2]

const QwtPlotLayoutEngine::LayoutData::ScaleData & QwtPlotLayoutEngine::LayoutData::axisData

(

QwtAxisId

axisId

)

const

Get scale data for a specific axis (const version)

参数

axisId

Axis identifier

返回

Constant reference to the scale data

hasSymmetricYAxes()

bool QwtPlotLayoutEngine::LayoutData::hasSymmetricYAxes

(

)

const

Check if Y axes are symmetric

Determines if both left and right Y axes are visible or both are hidden.

返回

True if both Y axes have the same visibility state

tickOffset()

double QwtPlotLayoutEngine::LayoutData::tickOffset

(

int

axisPos

)

const

Get tick offset for a specific axis position

参数

axisPos

Axis position (0-3)

返回

Tick offset value

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该类的文档由以下文件生成:

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