LAnnotation::Define

#include "ltwrappr.h"

virtual L_INT LAnnotation::Define(pPoint, uState)

LPPOINT pPoint;

/* pointer to a POINT structure */

L_UINT uState;

/* state of the process */

Specifies the shape when creating or transforming an annotation object. This function specifies one point in the current window each time it is called.

Parameter

Description

pPoint

Pointer to a POINT structure. The points in the array must be in the order in which the vertices are connected. To define the line that closes a polygon, the last point in the array is connected to the first point of the array. To define a rectangle, the last point is the opposite vertex of the first point.

uState

State of the process of modifying the annotation object. Possible values are:

 

Value

Meaning

 

ANNDEFINE_BEGINSET

[0] This is the first point to define a new object.

 

ANNDEFINE_BEGINMOVE

[1] This is the point from which to move the object.

 

ANNDEFINE_BEGINROTATE

[2] This is the starting point for calculating the angle of rotation.

 

ANNDEFINE_BEGINRESIZE

[3] This is the starting point for calculating the how to resize the object.

 

ANNDEFINE_BEGINSELECT

[4] This is the first corner of the rectangle used to select objects.

 

ANNDEFINE_APPEND

[5] This is the next point when defining an object that requires more than two points.

 

ANNDEFINE_UPDATE

[6] This is the current mouse position during creation of the object. Use this on a mouse move event to reflect the current shape of the object.

 

ANNDEFINE_END

[7] This is the last point.

 

ANNDEFINE_BEGINMOVESELECTED

[8] This is the point from which to move all selected objects.

 

ANNDEFINE_BEGINROTATESELECTED

[9] This is the starting point for calculating the angle of rotation for all selected objects.

 

ANNDEFINE_BEGINRESIZESELECTED

[10] This is the starting point for calculating the how to resize all selected objects.

 

ANNDEFINE_BEGINMOVENAME

[12] This is the starting point from which to move the object name.

 

ANNDEFINE_SETANCHORPOINT

[13] This is an anchor point. Use this value when rotating an annotation object around a point other than its center. When doing this, call LAnnotation::Define with this flag prior to calling LAnnotation::Define with the ANNDEFINE_BEGINROTATE flag.

 

ANNDEFINE_BEGINMOVEPOINT

[11] This is a starting point, used when moving one point on an annotation object

 

The behavior depends on the annotation object being manipulated.

 

This can be used to move a single point on any of the following annotation objects:

 

ANNOBJECT_LINE

 

ANNOBJECT_POLYLINE

 

ANNOBJECT_POLYGON

 

ANNOBJECT_POINTER

 

ANNOBJECT_FREEHAND

 

ANNOBJECT_FREEHANDHOTSPOT

 

ANNOBJECT_RULER

 

ANNOBJECT_CROSSPRODUCT

 

ANNOBJECT_PROTRACTOR

 

ANNOBJECT_CURVE

 

ANNOBJECT_CURVECLOSED

 

You can use ANNDEFINE_BEGINMOVEPOINT to perform a simultaneous rotate and resize for the following objects: When doing this, call LAnnotation::Define with the ANNDEFINE_SETANCHORPOINT flag prior to calling LAnnotation::Define with the ANNDEFINE_BEGINMOVEPOINT flag.

 

(Note that you must set an anchor point prior to using ANNDEFINE_BEGINMOVEPOINT)

 

ANNOBJECT_RECT

 

ANNOBJECT_ELLIPSE

 

ANNOBJECT_HILITE

 

ANNOBJECT_REDACT

 

ANNOBJECT_TEXT

 

ANNOBJECT_NOTE

 

ANNOBJECT_STAMP

 

ANNOBJECT_HOTSPOT

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

Before calling this function, you must create the object, and the object must have a window handle (which can be inherited from the container).

To specify the shape of an object that is defined by a polygon, you call this function repeatedly to create an array of points, which must be in the order in which the vertices are connected. To define the line that closes a polygon, the last point in the array is connected to the first point of the array.

You can also call this function on mouse move events during the definition of an object to update the current view of the object being defined. Thus, this function can handle the display of the object during and after its creation.

When rotating or resizing an object, you call this function for the first point and last point, and this function determines the angle of rotation or resize parameters based on the difference in the points.

When rotating an annotation object around a point other than its center, call LAnnotation::Define with the ANNDEFINE_SETANCHORPOINT flag set, prior to calling LAnnotation::Define with the ANNDEFINE_BEGINROTATE flag set. For example, to rotate an object around the point (10,20) in client coordinates, do the following:

(Assume that pMousePos->pt is the current mouse location in client coordinates)

POINT ptLocation;
ptLocation.x = 10; 
ptLocation.y = 20; 
pLAnnotationObject->Define( &ptLocation, ANNDEFINE_SETANCHORPOINT); 
pLAnnotationObject->Define(&pMousePos->pt, ANNDEFINE_BEGINROTATE); 

// One or more ANNDEFINE_APPEND
pLAnnotationObject->Define(&pMousePos->pt, ANNDEFINE_APPEND); 

pLAnnotationObject->Define(&pMousePos->pt, ANNDEFINE_END); 

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.

See Also

Functions:

Class Members, LAnnotation::AdjustPoint, LAnnContainer::Convert, LAnnotation::Define2, LAnnotation::GetRestrictToContainer, LAnnEncrypt::GetRotateAngle, LAnnContainer::HitTest, LAnnContainer::RestrictCursor, LAnnotation::SetRestrictToContainer, LAnnContainer::Convert, LAnnContainer::RestrictCursor, LAnnotation::GetRestrictToContainer, LAnnotation::SetRestrictToContainer, LAnnotation::Define2

Topics:

Annotation Functions: Creating and Deleting Annotations

 

Implementing Annotations

 

Types of Annotations

 

Annotation Functions: Implementing Custom Annotations

 

Displaying and Manipulating Annotation Objects

Example

L_INT LAnnotation_DefineExample(LAnnPolygon  * pAnnObject,HWND hWnd)
{
   L_INT nRet;
   RECT   rClientRect;
   POINT  MyPoint;
   GetClientRect(hWnd,&rClientRect) ;
   // Set the point for the opposite corner of the rectangle
   MyPoint.x = rClientRect.right / 2;
   MyPoint.y = rClientRect.bottom / 2;
   
   // Finish defining the rectangular annotation object 
   nRet = pAnnObject->Define( &MyPoint, ANNDEFINE_END);
   return nRet;
}