QuickTime 4 Reference

Explode

kExplodeTransitionType ('xplo')

In an explode effect, source B grows from a single point, expanding out until it entirely covers source A. The center point of the explosion is defined in the effect parameters.

Example:

This effect takes a maximum of two sources, and has three parameters.

Parameters

Use the descriptions below to help you understand what the parameters do. To learn how to use parameter atoms, see "Adding Video Effects to a QuickTime Movie"

Name	Code	QTAtom Type	Description
Percentage	`'pcnt'`	`kParameterTypeDataFixed` Always a tween	This parameter contains a tween. As the effect progresses, QuickTime renders the frame of the effect indicated by the tween's current value, as a percentage of the whole effect. For example, if the tween goes from 0 to 100, the effect renders completely; if the tween goes from 25 to 75, rendering begins 25% into the effect and terminates 75% through the effect.
Explode centre X	`'xcnt'`	`kParameterTypeDataFixed` Can be a tween	The x-coordinate of the explosion centre.
Explode centre Y	`'ycnt'`	`kParameterTypeDataFixed` Can be a tween	The y-coordinate of the explosion centre.

Name

Code

QTAtom Type

Description

Percentage

'pcnt'

kParameterTypeDataFixed

Always a tween

This parameter contains a tween. As the effect progresses, QuickTime renders the frame of the effect indicated by the tween's current value, as a percentage of the whole effect. For example, if the tween goes from 0 to 100, the effect renders completely; if the tween goes from 25 to 75, rendering begins 25% into the effect and terminates 75% through the effect.

Explode centre X

'xcnt'

kParameterTypeDataFixed

Can be a tween

The x-coordinate of the explosion centre.

Explode centre Y

'ycnt'

kParameterTypeDataFixed

Can be a tween

The y-coordinate of the explosion centre.