L_AnnGetRotateAngle

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnGetRotateAngle(hObject, pdAngle)

Gets the rotation angle for an annotation object.

Parameters

HANNOBJECT hObject

Handle to the annotation object.

L_DOUBLE *pdAngle

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

Returns

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

Comments

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.

This function is only valid for the following annotation object types:

If the function is used with an object that is not listed, it returns SUCCESS with *pdAngle equal to 0.

Required DLLs and Libraries

Platforms

Win32, x64.

See Also

Functions

Topics

Example

This example displays the rotation angle for the annotation hObject in radians and degrees.

L_INT AnnGetRotateAngleExample(HANNOBJECT hObject) 
{ 
   L_INT nRet; 
   L_DOUBLE    dAngle; 
   L_TCHAR     szMsg[200]; 
 
   nRet = L_AnnGetRotateAngle(hObject, &dAngle); 
   if (nRet == SUCCESS) 
   { 
      _stprintf_s(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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