L_AnnDefine2

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnDefine2(hObject, apt, uState)

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

Parameters

HANNOBJECT hObject

Handle to the annotation object.

pANNPOINT apt

Pointer to an ANNPOINT structure. The specified point is in container coordinates.

L_UINT uState

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

Value Meaning
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 L_AnnDefine2 with this flag set prior to calling L_AnnDefine2 with the ANNDEFINE_BEGINROTATE flag set.
ANNDEFINE_BEGINMOVEPOINT [11] This is a starting point, used when moving one point on an annotation object. 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:
(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
When doing this, call L_AnnDefine2 with the ANNDEFINE_SETANCHORPOINT flag set prior to calling L_AnnDefine2 with the ANNDEFINE_BEGINMOVEPOINT flag set.

Returns

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

Comments

This function is used only with the following states:

If you try to use a uState value other than ANNDEFINE_SETANCHORPOINT or ANNDEFINE_BEGINMOVEPOINT, the function returns ERROR_INV_PARAMETER.

This function is similar to L_AnnDefine, except that L_AnnDefine2 takes a point in container coordinates, whereas L_AnnDefine takes a point in client coordinates.

Use this function when additional accuracy is required when setting an anchor point, or doing a simultaneous rotate and resize. This function should be used in conjunction with L_AnnDefine.

As an example, suppose you want to rotate and resize the rectangle around the anchor point aptAnchor by moving the point aptMove, as shown in the following figure:

image\Ann14Doc_2.gif

This can be done by using only L_AnnDefine, but because L_AnnDefine takes integral arguments and aptAnchor and aptMove are not integral, the rotate and resize will not be exact.

To solve this and accurately perform simultaneous rotation and resizing, use L_AnnDefine2 and L_AnnDefine as follows:

ANNPOINT aptAnchor;    
ANNPOINT aptMove;   
aptMove.x = 10.2;   
aptMove.y = 10.5   
aptAnchor.x = 10.2;   
aptAnchor.y = 50.5   
ptLocation.x = 10;   
ptLocation.y = 20;   
L_AnnDefine2(hObject,  &aptAnchor, ANNDEFINE_SETANCHORPOINT);   
L_AnnDefine2(hObject,  &aptMove, ANNDEFINE_BEGINROTATE);   
// One or more ANNDEFINE_APPEND   
L_AnnDefine(pData->hObjectChange, &pMousePos->pt, ANNDEFINE_APPEND);    
L_AnnDefine(pData->hObjectChange, &pMousePos->pt, ANNDEFINE_END);  

Required DLLs and Libraries

Platforms

Win32, x64.

See Also

Functions

Topics

Example

This example uses static variables to simulate user input to rotate/resize a rectangle around a point on the bottom center line of the rectangle.
Initially the rectangle must not be rotated.

L_INT AnnDefine2Example(HANNOBJECT hRect) 
{ 
   L_INT nRet; 
   // Counter for simulating user input 
   static L_INT   nCallCount = 0; 
   L_UINT         uType; 
   ANNRECT        arcRect; 
   ANNPOINT       aptAnchor;  // Anchor point in container coordinates 
   ANNPOINT       aptMove;    // Move point in container coordinates 
   POINT          ptMove;     // Move point in client coordinates 
   L_DOUBLE       dAngle; 
   HANNOBJECT     hContainer; 
 
   nRet = L_AnnGetType(hRect, &uType); 
   if(nRet != SUCCESS) 
      return nRet; 
   if (uType != ANNOBJECT_RECT) 
   { 
      MessageBox(NULL, TEXT("Object must be a rectangle."), TEXT("Error"), MB_OK); 
      return 0; 
   } 
 
   nRet = L_AnnGetRotateAngle(hRect, &dAngle); 
   if(nRet != SUCCESS) 
      return nRet; 
   if (dAngle != 0) 
   { 
      MessageBox(NULL, TEXT("Object must not be rotated."), TEXT("Error"), MB_OK); 
      return nRet; 
   } 
   ++nCallCount; 
   switch (nCallCount) 
   { 
   case 1: 
      nRet = L_AnnGetRect(hRect, &arcRect, NULL); 
      if(nRet != SUCCESS) 
         return nRet; 
      aptAnchor.x = (arcRect.left + arcRect.right) / 2; 
      aptAnchor.y = arcRect.bottom; 
 
      aptMove.x = (arcRect.left + arcRect.right) / 2; 
      aptMove.y = arcRect.top; 
 
      nRet = L_AnnDefine2(hRect, &aptAnchor, ANNDEFINE_SETANCHORPOINT); 
      if(nRet != SUCCESS) 
         return nRet; 
      nRet = L_AnnDefine2(hRect, &aptMove, ANNDEFINE_BEGINMOVEPOINT); 
      if(nRet != SUCCESS) 
         return nRet; 
      MessageBox(NULL, TEXT("Call ExampleAnnDefine2 to complete the rotate/resize."), TEXT(""), MB_OK); 
      break; 
 
   case 2: 
      nRet = L_AnnGetRect(hRect, &arcRect, NULL); 
      if(nRet != SUCCESS) 
         return nRet; 
      aptMove.x = arcRect.right; 
      aptMove.y = arcRect.top; 
 
      nRet = L_AnnGetTopContainer(hRect, &hContainer); 
      if(nRet != SUCCESS) 
         return nRet; 
      nRet = L_AnnConvert(hContainer, &ptMove, &aptMove, 1, ANNCONVERT_TO_CLIENT); 
      if(nRet != SUCCESS) 
         return nRet; 
 
      nRet = L_AnnDefine(hRect, &ptMove, ANNDEFINE_END); 
      if(nRet != SUCCESS) 
         return nRet; 
      nCallCount = 0; 
      MessageBox(NULL, TEXT("Rotate/resize finished!"), TEXT(""), MB_OK); 
      break; 
   } 
   return SUCCESS; 
} 

Help Version 20.0.2019.9.22
Products | Support | Contact Us | Intellectual Property Notices
© 1991-2019 LEAD Technologies, Inc. All Rights Reserved.

LEADTOOLS Raster Imaging C API Help