QTradingView::LogScale Class Reference

Logarithmic scale implementation for chart axes. More...

#include <LogScale.h>

Inheritance diagram for QTradingView::LogScale:

Public Member Functions
	LogScale ()
	Constructs a LogScale with default domain and range.
	LogScale (double minValue, double maxValue, double minPixel, double maxPixel)
	Constructs a LogScale with specified domain and range.
	~LogScale () override=default
	Destructor.
double	dataToPixel (double value) const override
	Converts a data value to a pixel position.
double	pixelToData (double pixel) const override
	Converts a pixel position to a data value.
void	setDomain (double minValue, double maxValue) override
	Sets the data domain for the scale.
void	setRange (double minPixel, double maxPixel) override
	Sets the pixel range for the scale.
std::vector< double >	getTicks (int approxCount) const override
	Returns tick positions for the scale.
void	applyPadding (double &minValue, double &maxValue, double paddingRatio) const override
	Applies padding to the data domain.
void	zoomDomain (double &minValue, double &maxValue, double zoomFactor, double anchorValue) const override
	Zooms the data domain by a factor around an anchor value.
void	setLinearThreshold (double threshold)
	Sets the threshold below which the scale behaves linearly.
double	getLinearThreshold () const
	Gets the current linear threshold value.
Public Member Functions inherited from QTradingView::IScale
virtual	~IScale ()=default
	Virtual destructor for IScale.
std::vector< double >	getTicks () const
	Returns a default vector of tick values (approx. 5).

Detailed Description

Logarithmic scale implementation for chart axes.

Provides conversion between data values and pixel positions using a symmetric logarithmic scale.

Constructor & Destructor Documentation

LogScale()

QTradingView::LogScale::LogScale	(	double	minValue,
		double	maxValue,
		double	minPixel,
		double	maxPixel
	)

Constructs a LogScale with specified domain and range.

Parameters

minValue	Minimum data value.
maxValue	Maximum data value.
minPixel	Minimum pixel position.
maxPixel	Maximum pixel position.

Member Function Documentation

applyPadding()

void QTradingView::LogScale::applyPadding ( double &  minValue, double &  maxValue, double  paddingRatio  ) const

overridevirtual

Applies padding to the data domain.

Parameters

minValue	Reference to minimum value to pad.
maxValue	Reference to maximum value to pad.
paddingRatio	Ratio of padding to apply.

Implements QTradingView::IScale.

dataToPixel()

double QTradingView::LogScale::dataToPixel ( double  value ) const

overridevirtual

Converts a data value to a pixel position.

Parameters

value

The data value to convert.

Returns

The corresponding pixel position.

Implements QTradingView::IScale.

getLinearThreshold()

double QTradingView::LogScale::getLinearThreshold

(

)

const

Gets the current linear threshold value.

Returns

The linear threshold.

getTicks()

std::vector< double > QTradingView::LogScale::getTicks ( int  approxCount ) const

overridevirtual

Returns tick positions for the scale.

Parameters

approxCount

Approximate number of ticks desired.

Returns

Vector of tick positions in data coordinates.

Implements QTradingView::IScale.

pixelToData()

double QTradingView::LogScale::pixelToData ( double  pixel ) const

overridevirtual

Converts a pixel position to a data value.

Parameters

pixel

The pixel position to convert.

Returns

The corresponding data value.

Implements QTradingView::IScale.

setDomain()

void QTradingView::LogScale::setDomain ( double  minValue, double  maxValue  )

overridevirtual

Sets the data domain for the scale.

Parameters

minValue	Minimum data value.
maxValue	Maximum data value.

Implements QTradingView::IScale.

setLinearThreshold()

void QTradingView::LogScale::setLinearThreshold

(

double

threshold

)

Sets the threshold below which the scale behaves linearly.

Parameters

threshold

The linear threshold value.

setRange()

void QTradingView::LogScale::setRange ( double  minPixel, double  maxPixel  )

overridevirtual

Sets the pixel range for the scale.

Parameters

minPixel	Minimum pixel position.
maxPixel	Maximum pixel position.

Implements QTradingView::IScale.

zoomDomain()

void QTradingView::LogScale::zoomDomain ( double &  minValue, double &  maxValue, double  zoomFactor, double  anchorValue  ) const

overridevirtual

Zooms the data domain by a factor around an anchor value.

Parameters

minValue	Reference to minimum value to zoom.
maxValue	Reference to maximum value to zoom.
zoomFactor	Zoom factor to apply.
anchorValue	Value to anchor the zoom.

Implements QTradingView::IScale.

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

• include/QTradingView/scale/LogScale.h
• src/scale/LogScale.cpp