QTradingView::ViewPort Class Reference

Manages the visible range and pixel mapping for chart bars. More...

#include <ViewPort.h>

Public Member Functions
	ViewPort ()
	Constructs an empty ViewPort.
	ViewPort (int startIndex, int endIndex, const QRectF &pixelRect, double barWidth=8.0)
	Constructs a ViewPort with specified range, pixel rectangle, and bar width.
void	setVisibleRange (int start, int end)
	Sets the visible range of bar indices.
int	startIndex () const
	Returns the index of the first visible bar.
int	endIndex () const
	Returns the index of the last visible bar.
int	visibleCount () const
	Returns the number of visible bars in the viewport.
void	setPixelRect (const QRectF &rect)
	Sets the pixel rectangle for the viewport area.
QRectF	pixelRect () const
	Returns the pixel rectangle of the viewport.
double	indexToPixel (int index) const
	Converts a bar index to its pixel position within the viewport.
int	pixelToIndex (double pixel) const
	Converts a pixel position to the corresponding bar index.
void	setBarWidth (double width)
	Sets the width of each bar in pixels.
double	barWidth () const
	Returns the width of each bar in pixels.

Detailed Description

Manages the visible range and pixel mapping for chart bars.

ViewPort controls which data indices are visible, their pixel positions, and the bar width for rendering. It provides conversion between data indices and pixel coordinates, and supports dynamic resizing and zooming.

Constructor & Destructor Documentation

ViewPort()

QTradingView::ViewPort::ViewPort	(	int	startIndex,
		int	endIndex,
		const QRectF &	pixelRect,
		double	barWidth = 8.0
	)

Constructs a ViewPort with specified range, pixel rectangle, and bar width.

Parameters

startIndex	Index of the first visible bar.
endIndex	Index of the last visible bar.
pixelRect	Rectangle area in pixels for the viewport.
barWidth	Width of each bar in pixels (default 8.0).

Member Function Documentation

indexToPixel()

double QTradingView::ViewPort::indexToPixel

(

int

index

)

const

Converts a bar index to its pixel position within the viewport.

Parameters

index

Bar index to convert.

Returns

Pixel position corresponding to the index.

pixelToIndex()

int QTradingView::ViewPort::pixelToIndex

(

double

pixel

)

const

Converts a pixel position to the corresponding bar index.

Parameters

pixel

Pixel position to convert.

Returns

Bar index corresponding to the pixel position.

setBarWidth()

void QTradingView::ViewPort::setBarWidth

(

double

width

)

Sets the width of each bar in pixels.

Parameters

width

Bar width in pixels.

setPixelRect()

void QTradingView::ViewPort::setPixelRect

(

const QRectF &

rect

)

Sets the pixel rectangle for the viewport area.

Parameters

rect	Rectangle area in pixels.

setVisibleRange()

void QTradingView::ViewPort::setVisibleRange	(	int	start,
		int	end
	)

Sets the visible range of bar indices.

Parameters

start	Index of the first visible bar.
end	Index of the last visible bar.

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

• include/QTradingView/ViewPort.h
• src/ViewPort.cpp