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

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.

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