﻿ LAnnLine::GetRotateAngle | LAnnLine Class Members | Raster imaging C++ Class Library Help
In This Topic ▼

# LAnnLine::GetRotateAngle

## Summary

Gets the rotation angle for an annotation object.

## Syntax

`#include "ltwrappr.h"`

virtual L_INT LAnnLine::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.

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.

Win32, x64.

## Example

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

````L_INT LAnnLine_GetRotateAngleExample(LAnnLine * pLLine)  `
`{ `
`   L_INT nRet; `
`   L_DOUBLE dAngle;   `
`   L_TCHAR   szMsg[200];  `
` `
`   nRet = pLLine->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; `
`} ````

Help Version 22.0.2023.2.2