In This Topic ▼

LAnnText::GetRotateAngle

Summary

Gets the rotation angle for a Text annotation object.

Syntax

#include "ltwrappr.h"

virtual L_INT LAnnText::GetRotateAngle(pdAngle)

Parameters

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 this 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.

Example

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

L_INT LAnnText_GetRotateAngleExample(LAnnText * pLText)  
{ 
	L_INT nRet; 
   L_DOUBLE dAngle;  
   L_TCHAR   szMsg[200];  
 
   nRet = pLText->GetRotateAngle(&dAngle);  
   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; 
}