IlvBitmapTransition Class Reference

Bitmap transition class. More...

#include <ilviews/bitmaps/transition.h>

Inheritance diagram for IlvBitmapTransition:

List of all members.

Public Member Functions
virtual void	computeTransitionBitmapData (IlDouble oldRate, IlDouble newRate, const IlvRGBBitmapData &src, const IlvRGBBitmapData &dst, IlvRGBBitmapData &current, IlvRegion &region) const =0
	Computes a transition image between the specified bitmap data objects.
Static Public Member Functions
static void	Draw (IlvPort &dst, const IlvPoint &at, const IlvBitmapData &src, const IlvRegion &region)
	Draws the specified region of the bitmap data object into the specified port.

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Detailed Description

Bitmap transition class.

Library: display

This abstract class is the base class for all bitmap transition classes. It provides an interface to sample transitions between two bitmap data objects of the same size and color depth. This class can be used with the IlvBitmapTransitionHandler class to provide animation between two images.

See also:

IlvRGBBitmapData

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Member Function Documentation

virtual void IlvBitmapTransition::computeTransitionBitmapData	(	IlDouble	oldRate,
		IlDouble	newRate,
		const IlvRGBBitmapData &	src,
		const IlvRGBBitmapData &	dst,
		IlvRGBBitmapData &	current,
		IlvRegion &	region
	)			const [pure virtual]

Computes a transition image between the specified bitmap data objects.

This method is pure and must be defined in subclasses. It computes a transition image given a source bitmap data object, a destination bitmap data object, and a percentage of completion of the transition. src and dst must have the same size and color depth.
When calling this method, current must contain the transition image corresponding to the oldRate percentage of completion. After returning, current contains the transition image corresponding to the newRate percentage of completion.

Parameters:

	oldRate	The previous percentage of completion of the transition. Valid values are double values in the interval 0-100.
	newRate	The new percentage of completion of the transition. Valid values are double values in the interval 0-100.
	src	The source bitmap data.
	dst	The destination bitmap data.
	current	The current bitmap data.
	region	The region of the current bitmap that has changed between the transition from oldRate to newRate.

Implemented in IlvAlphaBitmapTransition, IlvSimpleBitmapTransition, and IlvDissolveBitmapTransition.

static void IlvBitmapTransition::Draw	(	IlvPort &	dst,
		const IlvPoint &	at,
		const IlvBitmapData &	src,
		const IlvRegion &	region
	)			[static]

Draws the specified region of the bitmap data object into the specified port.

Parameters:

	dst	The destination port.
	at	The location where the bitmap data will be copied.
	src	The source bitmap data.
	region	The region of the bitmap data that will be copied into dst.