WMT_VIDEOIMAGE_TRANSITION_WHEEL

[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The wheel transition reveals the new image by rotating four lines around a common pivot point, like the spokes of a wheel.

Parameters

The following table describes the parameters used by this transition and lists the members of the WMT_VIDEOIMAGE_SAMPLE2 structure to which they are assigned.

Parameter	Structure member	Description
Center X	fEffectPara0	X-coordinate, relative to the video frame, of the center of the wheel effect.
Center Y	fEffectPara1	Y-coordinate, relative to the video frame, of the center of the wheel effect.
Angle	fEffectPara2	Angle of rotation, in degrees, of the spokes of the wheel effect. A value of 0.0 indicates the old image without any of the new image revealed. A value of 90.0 indicates the new image fully revealed.Movement from 0.0 to 90.0 appears as clockwise rotation of the spokes.
Composition	fEffectPara3	Set to one of the following values: 0 - Specifies normal composition, in which the previous image is the background, and the current image is the foreground. 1 - Specifies reversed composition, in which the current image is the background image, and the previous image is the foreground

Requirements

Requirement	Value
Header	Wmsdkidl.h

See also

Video Image Transitions