PowerOfTwoZoomConstraint Class Reference

#include <PowerOfTwoZoomConstraint.h>

Inheritance diagram for PowerOfTwoZoomConstraint:

Collaboration diagram for PowerOfTwoZoomConstraint:

Public Types
enum	RoundingDirection { RoundDown, RoundUp, RoundNearest }

Public Member Functions
virtual ZoomLevel	getNearestZoomLevel (ZoomLevel requested, RoundingDirection dir=RoundNearest) const override
	Given an "ideal" zoom level (frames per pixel or pixels per frame) for a given zoom level, return the nearest viable block size for this constraint. More...
virtual ZoomLevel	getMinZoomLevel () const
	Return the minimum zoom level within range for this constraint. More...
virtual ZoomLevel	getMaxZoomLevel () const
	Return the maximum zoom level within range for this constraint. More...

Protected Member Functions
virtual int	getNearestBlockSize (int requested, RoundingDirection dir=RoundNearest) const

Detailed Description

Definition at line 21 of file PowerOfTwoZoomConstraint.h.

Member Enumeration Documentation

enum ZoomConstraint::RoundingDirection

inherited

Enumerator
RoundDown
RoundUp
RoundNearest

Definition at line 37 of file ZoomConstraint.h.

Member Function Documentation

ZoomLevel PowerOfTwoZoomConstraint::getNearestZoomLevel ( ZoomLevel  requestedZoomLevel, RoundingDirection  = RoundNearest  ) const

overridevirtual

Given an "ideal" zoom level (frames per pixel or pixels per frame) for a given zoom level, return the nearest viable block size for this constraint.

For example, if a block size of 1523 frames per pixel is requested but the underlying model only supports value summaries at powers-of-two block sizes, return 1024 or 2048 depending on the rounding direction supplied.

Reimplemented from ZoomConstraint.

Definition at line 19 of file PowerOfTwoZoomConstraint.cpp.

References ZoomLevel::FramesPerPixel, ZoomConstraint::getMaxZoomLevel(), ZoomConstraint::getMinZoomLevel(), getNearestBlockSize(), ZoomLevel::level, ZoomConstraint::RoundDown, ZoomConstraint::RoundUp, and ZoomLevel::zone.

int PowerOfTwoZoomConstraint::getNearestBlockSize ( int  requested, RoundingDirection  dir = RoundNearest  ) const

protectedvirtual

Definition at line 47 of file PowerOfTwoZoomConstraint.cpp.

References ZoomConstraint::getMaxZoomLevel(), ZoomLevel::level, ZoomConstraint::RoundDown, and ZoomConstraint::RoundNearest.

Referenced by getNearestZoomLevel().

virtual ZoomLevel ZoomConstraint::getMinZoomLevel ( ) const

inlinevirtualinherited

Return the minimum zoom level within range for this constraint.

Individual views will probably want to limit this, for example in order to ensure that at least one or two samples fit in the current window size, or in order to save on interpolation cost.

Definition at line 71 of file ZoomConstraint.h.

References ZoomLevel::PixelsPerFrame.

Referenced by PowerOfSqrtTwoZoomConstraint::getNearestZoomLevel(), and getNearestZoomLevel().

virtual ZoomLevel ZoomConstraint::getMaxZoomLevel ( ) const

inlinevirtualinherited

Return the maximum zoom level within range for this constraint.

This is quite large – individual views will probably want to limit how far a user might reasonably zoom out based on other factors such as the duration of the file.

Definition at line 81 of file ZoomConstraint.h.

References ZoomLevel::FramesPerPixel.

Referenced by getNearestBlockSize(), PowerOfSqrtTwoZoomConstraint::getNearestBlockSize(), getNearestZoomLevel(), and ZoomConstraint::getNearestZoomLevel().

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

• PowerOfTwoZoomConstraint.h
• PowerOfTwoZoomConstraint.cpp