L_AnnRotate

Show in webframe

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnRotate(hObject, dAngle, pCenter, uFlags)

HANNOBJECT hObject;	/* handle to the annotation object */
L_DOUBLE dAngle;	/* angle of rotation */
pANNPOINT pCenter;	/* pointer to the center of rotation */
L_UINT uFlags;	/* flags that determine which objects to process */

Rotates one or more annotation objects.

Parameter	Description
hObject	Handle to the annotation object.
dAngle	The angle of rotation, expressed in double-precision floating point.
pCenter	Pointer to the LEADTOOLS ANNPOINT structure that specifies the center of rotation.
	Pass NULL in this parameter to use the default for each affected object. With the default, if a container is rotated, all objects in it are rotated as a unit, using the container's center as the axis. If an individual object is rotated, it is rotated on its own center.
	The ANNPOINT structure is like a Windows POINT structure, except that it uses double-precision floating point values.
	Coordinates of an object's points are relative to its container object. The coordinates are interpreted using the container's scaling factors and offsets, which are described in Low-Level Coordinate System for Annotations.
uFlags	Flags that determine which objects to process. Most of the flags apply only to container objects. You can combine values when appropriate by using a bitwise OR ( \| ). The following are valid values:
	Value	Meaning
	0	Process only the specified object.
	ANNFLAG_SELECTED	[0x0001] Process only objects that have the selected property set to TRUE. For getting and setting the selected property, use the L_AnnGetSelected and L_AnnSetSelected functions.
	ANNFLAG_NOTTHIS	[0x0004] Process only one level of objects within the specified container, not the container itself. If there are containers within the container, they are modified, but the objects within them are not.
	ANNFLAG_RECURSE	[0x0008] Process objects within a container, and within any subcontainers, down to any level.
	ANNFLAG_NOTCONTAINER	[0x0002] (Used with ANNFLAG_RECURSE) Process objects within containers, not the containers themselves.
	ANNFLAG_NOINVALIDATE	[0x0010] Do not invalidate the affected rectangle in the window. Use this to avoid generating unwanted paint messages.

Returns

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

Comments

This function applies to multiple and selected objects based on values of the uFlags parameter.

You cannot rotate a note, hot spot, button, or audio clip. If you rotate a container that includes these objects, they will move to new positions, but will retain their orientation.

L_AnnRotate does not change the bitmap of a Point annotation object. It only changes the position of the point. To change the bitmap you must get the bitmap using L_AnnGetBitmap, change the bitmap, and then set the bitmap using L_AnnSetBitmap.

The center of a protractor object is the angle point (vertex). The center of a cross-product is the intersection of the two rulers. If you pass NULL for pCenter, these center points will be used instead of the center of the bounding rectangle when rotating the object.

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:	L_AnnMove, L_AnnFlip, L_AnnReverse, L_AnnResize
Topics:	Annotation Functions: Doing Geometric Transformations
	Implementing an Automated Annotation Program
	Implementing a Non-automated Annotation Program
	Displaying and Manipulating Annotation Objects
	Flipping, Reversing and Rotating Annotation Objects

Example

This example rotates an object using its lower right corner as the center of rotation.

 L_INT AnnRotateExample(HANNOBJECT hAnnObject)
{
   L_INT nRet;
   ANNPOINT RotationPt; /* Point of rotation */
   ANNRECT  ObjectRect; /* Defining rectangle of this object */
   ANNRECT  ObjectRectName;

   /* Get the object's rectangle to use for calculating rotation */
   nRet = L_AnnGetRect(hAnnObject, &ObjectRect, &ObjectRectName);
   if(nRet != SUCCESS)
      return nRet;
   /* Specify the point of rotation (the object's lower right corner ) */
   RotationPt.x = ObjectRect.right;
   RotationPt.y = ObjectRect.bottom;
   /* Rotate the object 90 degrees clockwise */
   nRet = L_AnnRotate(hAnnObject, 90, &RotationPt, 0);
   if(nRet != SUCCESS)
      return nRet;
   return SUCCESS;
}