Products | Support | Send comments on this topic. | Email a link to this topic. | Back to Getting Started | Help Version 18.0.10.24
LEADTOOLS Raster imaging C++ Class library help

LAnnTextPointer::GetRotateAngle

Show in webframe

#include "ltwrappr.h"

virtual L_INT LAnnTextPointer::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.

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.

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.

See Also

Functions:

Class Members

Topics:

Annotation Functions: Object Properties

 

Implementing Annotations

 

Automated User Interface for Annotations

 

Annotation Functions: Creating and Deleting Annotations

 

Types of Annotations

 

Annotation Functions: Implementing Custom Annotations

 

Fixed Annotations

 

Minimizing Flicker With Double Buffering

Example

// This examples displays the rotate angle of the annotation TextPointer in radians and degrees

L_INT LAnnTextPointer_GetRotateAngleExample(LAnnTextPointer * pLTextPointer) 
{
        L_INT nRet;
   L_DOUBLE dAngle; 
   L_TCHAR   szMsg[200]; 
   nRet = pLTextPointer->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;
}
Products | Support | Contact Us | Copyright Notices
© 2006-2014 All Rights Reserved. LEAD Technologies, Inc.