MontiVision DirectShow SDK Documentation

The IMVRotation interface is used to control the filters image processing algorithm. Read the filter description to see how the filter is used. Read the remarks for implementation details.

get_RotationCenterX	Returns the horizontal center of the rotation.
put_RotationCenterX	Sets the horizontal center of the rotation.
get_RotationCenterY	Returns the vertical center of the rotation.
put_RotationCenterY	Sets the vertical center of the rotation.
get_CenterMode	Returns the currently used center mode.
put_CenterMode	Sets the center mode.
get_RotationAngle	Returns the currently used rotation angle in degrees.
put_RotationAngle	Sets the rotation angle in degrees.
get_Interpolation	Returns the interpolation mode.
put_Interpolation	Sets the interpolation mode.

Header file: iMVRotation.h
Interface definition language file: iMVRotation.idl
Typelib: MVRotation
Interface ID: IID_IMVRotation

HRESULT get_RotationCenterX( [out, retval] int *piCenterX );

Returns the horizontal center of the rotation in relation to the image origin (lower left corner).

Parameter:

piCenterX

A pointer to an integer value that receives the horizontal center of the rotation.

HRESULT put_RotationCenterX( [in ] int iCenterX );

Sets the horizontal center of the rotation in relation to the image origin (lower left corner).

Parameter:

iCenterX

The horizontal center of the rotation.

HRESULT get_RotationCenterY( [out, retval] int *piCenterY );

Returns the vertical center of the rotation in relation to the image origin (lower left corner).

Parameter:

piCenterY

A pointer to an integer value that receives the vertical center of the rotation.

HRESULT put_RotationCenterY( [in ] int iCenterY );

Sets the vertical center of the rotation in relation to the image origin (lower left corner)..

Parameter:

iCenterY

The vertical center of the rotation.

HRESULT get_CenterMode( [out, retval] int *piCenterMode );

Returns the currently used center mode.

Parameter:

piCenterMode

A pointer to an integer value that receives the center mode as MV_ROTATION_CENTER_MODE .

HRESULT put_CenterMode( [in ] int iCenterMode );

Sets the center mode.

Parameter:

iCenterMode

The center mode as MV_ROTATION_CENTER_MODE .

HRESULT get_RotationAngle( [out, retval] double *pdAngle );

Returns the currently used rotation angle in degrees.

Parameter:

pdAngle

A pointer to a float value that receives the rotation angle in degrees.

HRESULT put_RotationAngle( [in ] double dAngle );

Sets the rotation angle in degrees.

Parameter:

dAngle

The rotation angle in degrees.

HRESULT get_Interpolation( [out, retval] int *piInterpolation);

Returns the currently used interpolation mode.

Parameter:

piInterpolation

A pointer to an integer value that receives the interpolation mode as MV_INTERPOLATION_MODE .

HRESULT put_Interpolation( [in ] int iInterpolation);

Sets the interpolation mode.

Parameter:

iInterpolation

The interpolation mode as MV_INTERPOLATION_MODE .

Filter specific structures and enumerators

typedef enum _MV_ROTATION_CENTER_MODE
{
    MV_ROTATION_CENTER_MANUAL= 0,
    MV_ROTATION_CENTER_IMAGE,
    MV_ROTATION_CENTER_INPUT_ROI,
    MV_ROTATION_CENTER_OUTPUT_ROI
} MV_ROTATION_CENTER_MODE;

Remarks

The following sequence is used to .

IMVRotation *pIMVRotation;

...

// We want to rotate the video frame 45° around the image center
pIMVRotation->put_CenterMode( MV_ROTATION_CENTER_IMAGE );
pIMVRotation->put_RotationAngle( 45 );
pIMVRotation->put_Interpolation( MV_INTERPOLATION_NN );