Reverses one or more annotation objects, left to right.
L_LTANN_API L_INT L_AnnReverse(hObject, pCenter, uFlags)
Handle to the annotation object.
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 reversed, all objects in it are reversed as a unit, using the container's center as the axis. If an individual object is reversed, it is reversed 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.
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:
|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.|
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
This function applies to multiple and selected objects based on values of the
You cannot flip or reverse an object that contains text. If you flip or reverse a container that includes text, the text will move to the new position, but will retain its orientation.
L_AnnReverse 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 reversing the object.
This example reverses an object on its own center.
L_INT AnnReverseExample(HANNOBJECT hAnnObject)
ANNPOINT RotationPt; /* Point of rotation */
ANNRECT ObjectRect; /* Defining rectangle of this object */
/* Get the object's rectangle to use for calculating rotation */
nRet = L_AnnGetRect(hAnnObject, &ObjectRect, &ObjectRectName);
if(nRet != SUCCESS)
/* Specify the horizontal point of rotation (the object's own center ) */
RotationPt.x = ObjectRect.left + ((ObjectRect.right - ObjectRect.left) / 2);
/* Reverse the object */
nRet = L_AnnReverse(hAnnObject, &RotationPt, 0);
if(nRet != SUCCESS)
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