﻿ LAnnRectangle::GetRotateAngle - Raster imaging C++ Class Library Help
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# LAnnRectangle::GetRotateAngle

#include "ltwrappr.h"

virtual L_INT LAnnRectangle::GetRotateAngle(pdAngle)

 L_DOUBLE *pdAngle; pointer to a double that returns the rotate angle

Gets the rotation angle for an annotation object.

 Parameter Description pdAngle Pointer to a double variable to be updated with the rotation angle.

#### Returns

 SUCCESS The function was successful. < 1 An error occurred. Refer to Return Codes.

Call this function to get the rotation angle for a particular annotation object.

The angle is in radians, and uses the following convention.

The possible range of rotate values is (-Pi) ... (Pi)

A rotation in the clockwise direction is considered a positive rotation.

A rotation in the counter-clockwise direction is considered a negative rotation.

For example, if a rectangle is rotated 90 degrees in the counter clockwise direction, this function will get (-PI/2) for the rotation angle. If a rectangle is rotated 90 degrees in the clockwise direction, this function will get PI/2 for the rotation angle. If a rectangle is rotated 270 degrees in the counter clockwise direction, this is equivalent to 90 degrees in the clockwise direction so the rotation value returned is PI/2.

Required DLLs and Libraries

 LTANN For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

 Functions: Class Members Topics: Annotation Functions: Implementing Custom Annotations

## Example

// This examples displays the rotation angle of the Rectangle annotation object in radians and degrees

L_INT LAnnRectangle_GetRotateAngleExample(LAnnRectangle * pLRectangle)
{
L_INT nRet;
L_DOUBLE dAngle;
L_TCHAR   szMsg[200];

nRet = nRet = pLRectangle->GetRotateAngle(&dAngle);
if(nRet != SUCCESS)
return nRet;
if (nRet == SUCCESS)
{
wsprintf(szMsg, TEXT("Angle of rotation:  Radians[%lf]  Degrees[%f]\n"),
dAngle,
dAngle *180 / 3.1415926535
);
MessageBox(NULL, szMsg, TEXT(""), MB_OK);
}
else
return nRet;

return SUCCESS;
}

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