QwtPlotLayoutEngine::LayoutData Class Reference

Classes
struct	CanvasData
struct	LabelData
struct	LegendData
struct	ScaleData

Public Types
enum	Label { Title , Footer , NumLabels }

Public Member Functions
	LayoutData (const QwtPlot *plot)
	Construct LayoutData from a QwtPlot / 从QwtPlot构造LayoutData.
bool	hasSymmetricYAxes () const
	Check if Y axes are symmetric / 检查Y轴是否对称
ScaleData &	axisData (QwtAxisId axisId)
	Get scale data for a specific axis / 获取特定轴的刻度数据
const ScaleData &	axisData (QwtAxisId axisId) const
	Get scale data for a specific axis / 获取特定轴的刻度数据
double	tickOffset (int axisPos) const
	Get tick offset for a specific axis position / 获取特定轴位置的刻度偏移量

Public Attributes
LegendData	legendData
LabelData	labelData [NumLabels]
CanvasData	canvasData

Constructor & Destructor Documentation

LayoutData()

QwtPlotLayoutEngine::LayoutData::LayoutData

(

const QwtPlot *

plot

)

Construct LayoutData from a QwtPlot / 从QwtPlot构造LayoutData.

Initializes all layout data by extracting information from the plot's components including legend, labels, axes and canvas.

通过从绘图组件（包括图例、标签、轴和画布）提取信息来初始化所有布局数据。

Parameters

plot	Pointer to the QwtPlot / 指向QwtPlot的指针

Member Function Documentation

axisData() [1/2]

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

(

QwtAxisId

axisId

)

Get scale data for a specific axis / 获取特定轴的刻度数据

Parameters

axisId

Axis identifier / 轴标识符

Returns

Mutable reference to the scale data / 刻度数据的可变引用

axisData() [2/2]

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

(

QwtAxisId

axisId

)

const

Get scale data for a specific axis / 获取特定轴的刻度数据

Parameters

axisId

Axis identifier / 轴标识符

Returns

Constant reference to the scale data / 刻度数据的常量引用

hasSymmetricYAxes()

bool QwtPlotLayoutEngine::LayoutData::hasSymmetricYAxes

(

)

const

Check if Y axes are symmetric / 检查Y轴是否对称

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

确定左右Y轴是否都可见或都隐藏。

Returns

True if both Y axes have the same visibility state / 如果两个Y轴具有相同的可见性状态，则返回true

tickOffset()

double QwtPlotLayoutEngine::LayoutData::tickOffset

(

int

axisPos

)

const

Get tick offset for a specific axis position / 获取特定轴位置的刻度偏移量

Parameters

axisPos

Axis position (0-3) / 轴位置（0-3）

Returns

Tick offset value / 刻度偏移值

---

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

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