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Rogue Wave Views 5.6

Rogue Wave Views
Foundation Package API Reference Guide

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IlvAlphaBitmapTransition Class Reference

Bitmap transition class. More...

#include <ilviews/bitmaps/transition.h>

Inheritance diagram for IlvAlphaBitmapTransition:
IlvBitmapTransition

Public Member Functions

 IlvAlphaBitmapTransition ()
 Constructor. More...
 
virtual void computeTransitionBitmapData (IlDouble, IlDouble current, const IlvRGBBitmapData &src, const IlvRGBBitmapData &dst, IlvRGBBitmapData &bitmap, IlvRegion &region) const
 Computes a transition image between the specified bitmap data objects. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from IlvBitmapTransition
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. More...
 

Detailed Description

Bitmap transition class.

Library: display

This class handles bitmap transitions using alpha blending.

See Also
IlvSimpleBitmapTransition, IlvDissolveBitmapTransition

Constructor & Destructor Documentation

IlvAlphaBitmapTransition::IlvAlphaBitmapTransition ( )

Constructor.

Initializes a new instance of the IlvAlphaBitmapTransition class.

Member Function Documentation

virtual void IlvAlphaBitmapTransition::computeTransitionBitmapData ( IlDouble  oldRate,
IlDouble  newRate,
const IlvRGBBitmapData src,
const IlvRGBBitmapData dst,
IlvRGBBitmapData current,
IlvRegion region 
) const
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
oldRateThe previous percentage of completion of the transition. Valid values are double values in the interval 0-100.
newRateThe new percentage of completion of the transition. Valid values are double values in the interval 0-100.
srcThe source bitmap data.
dstThe destination bitmap data.
currentThe current bitmap data.
regionThe region of the current bitmap that has changed between the transition from oldRate to newRate.

Implements IlvBitmapTransition.


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