QTradingView::IScale Class Reference

Abstract base class for value-to-pixel scaling in QTradingView. More...

#include <IScale.h>

Inheritance diagram for QTradingView::IScale:

Public Member Functions
virtual	~IScale ()=default
	Virtual destructor for IScale.
virtual double	dataToPixel (double value) const =0
	Converts a data value to its corresponding pixel position.
virtual double	pixelToData (double pixel) const =0
	Converts a pixel position to its corresponding data value.
virtual void	setDomain (double minValue, double maxValue)=0
	Sets the domain (min and max data values) for the scale.
virtual void	setRange (double minPixel, double maxPixel)=0
	Sets the pixel range for the scale.
virtual std::vector< double >	getTicks (int approxCount) const =0
	Returns a vector of tick values for the axis.
std::vector< double >	getTicks () const
	Returns a default vector of tick values (approx. 5).
virtual void	applyPadding (double &minValue, double &maxValue, double paddingRatio) const =0
	Applies padding to the scale domain.
virtual void	zoomDomain (double &minValue, double &maxValue, double zoomFactor, double anchorValue) const =0
	Zooms the scale domain around an anchor value.

Detailed Description

Abstract base class for value-to-pixel scaling in QTradingView.

IScale provides an interface for converting between data values and pixel coordinates, managing scale domains and ranges, and generating axis ticks.

Member Function Documentation

applyPadding()

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

pure virtual

Applies padding to the scale domain.

Parameters

minValue	Minimum data value (modified).
maxValue	Maximum data value (modified).
paddingRatio	Ratio of padding to apply.

Implemented in QTradingView::LinearScale, and QTradingView::LogScale.

dataToPixel()

virtual double QTradingView::IScale::dataToPixel ( double  value ) const

pure virtual

Converts a data value to its corresponding pixel position.

Parameters

value

Data value.

Returns

Pixel position.

Implemented in QTradingView::LinearScale, and QTradingView::LogScale.

getTicks() [1/2]

std::vector< double > QTradingView::IScale::getTicks ( ) const

inline

Returns a default vector of tick values (approx. 5).

Returns

Vector of tick values.

getTicks() [2/2]

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

pure virtual

Returns a vector of tick values for the axis.

Parameters

approxCount

Approximate number of ticks desired.

Returns

Vector of tick values.

Implemented in QTradingView::LinearScale, and QTradingView::LogScale.

pixelToData()

virtual double QTradingView::IScale::pixelToData ( double  pixel ) const

pure virtual

Converts a pixel position to its corresponding data value.

Parameters

pixel

Pixel position.

Returns

Data value.

Implemented in QTradingView::LinearScale, and QTradingView::LogScale.

setDomain()

virtual void QTradingView::IScale::setDomain ( double  minValue, double  maxValue  )

pure virtual

Sets the domain (min and max data values) for the scale.

Parameters

minValue	Minimum data value.
maxValue	Maximum data value.

Implemented in QTradingView::LinearScale, and QTradingView::LogScale.

setRange()

virtual void QTradingView::IScale::setRange ( double  minPixel, double  maxPixel  )

pure virtual

Sets the pixel range for the scale.

Parameters

minPixel	Minimum pixel value.
maxPixel	Maximum pixel value.

Implemented in QTradingView::LinearScale, and QTradingView::LogScale.

zoomDomain()

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

pure virtual

Zooms the scale domain around an anchor value.

Parameters

minValue	Minimum data value (modified).
maxValue	Maximum data value (modified).
zoomFactor	Zoom factor to apply.
anchorValue	Value to anchor the zoom operation.

Implemented in QTradingView::LinearScale, and QTradingView::LogScale.

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

• include/QTradingView/scale/IScale.h