L_AnnGetRotateAngle
#include "l_bitmap.h"
L_LTANN_API L_INT L_AnnGetRotateAngle(hObject, pdAngle)
HANNOBJECT hObject; |
/* handle to the annotation object */ |
L_DOUBLE *pdAngle; |
/* pointer to a double that returns the rotate angle */ |
Gets the rotation angle for an annotation object.
Parameter |
Description |
hObject |
Handle to the annotation object. |
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.
This function is only valid for the following annotation object types:
ANNOBJECT_POINTER:
ANNOBJECT_LINE:
ANNOBJECT_RULER:
ANNOBJECT_AUDIO:
ANNOBJECT_BUTTON:
ANNOBJECT_ELLIPSE:
ANNOBJECT_HILITE:
ANNOBJECT_HOTSPOT:
ANNOBJECT_NOTE:
ANNOBJECT_RECT:
ANNOBJECT_REDACT:
ANNOBJECT_STAMP:
ANNOBJECT_TEXT:
ANNOBJECT_VIDEO:
ANNOBJECT_PUSHPIN:
ANNOBJECT_ENCRYPT:
If the function is used with an object that is not listed, it returns SUCCESS with *pdAngle equal to 0.
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. |
Win32, x64.
See Also
Example
This examples displays the rotate angle of 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; }