QwtPlotLayoutEngine::LayoutData Class Reference

Data structure for layout calculation. More...

#include <qwt_plot_layout_engine.h>

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

Public Types
enum	Label { Title , Footer , NumLabels }
	Label type enumeration. More...

Public Member Functions
	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 Attributes
LegendData	legendData
LabelData	labelData [NumLabels]
CanvasData	canvasData
int	parasiteCaptionHeight [QwtAxis::AxisPositions]

Detailed Description

Data structure for layout calculation.

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

Member Enumeration Documentation

Label

enum QwtPlotLayoutEngine::LayoutData::Label

Label type enumeration.

Identifies title or footer labels in the layout.

Enumerator
Title	Title label.
Footer	Footer label.
NumLabels	Number of label types.

Constructor & Destructor Documentation

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.

Parameters

plot	Pointer to the QwtPlot

Member Function Documentation

axisData() [1/2]

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

(

QwtAxisId

axisId

)

Get scale data for a specific axis (mutable version)

Parameters

axisId

Axis identifier

Returns

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)

Parameters

axisId

Axis identifier

Returns

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.

Returns

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.

Parameters

axisPos

Axis position (0-3)

Returns

Tick offset value

---

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

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