L_AnnHitTest

#include "l_bitmap.h"

L_LTANN_API L_INT L_AnnHitTest(hObject, pPoint, puResult, phObjectHit, pHitTestInfo, uStructSize)

This function gets the handle to the annotation object that is located at a specified point. (If objects overlap, it gets the front object.) and additional information about the annotation object handle if the handle is a default or user-defined handle.

Parameters

HANNOBJECT hObject

Handle to the container object that sets the scope of the search.

LPPOINT pPoint

Pointer to the POINT structure that specifies the point to test. Coordinates are relative to the associated window's client area.

L_UINT *puResult

The position on the annotation object that was found at the specified point. Possible values are:

ANNHIT_NONE [0]
ANNHIT_BODY [1]
ANNHIT_HANDLE [2]
ANNHIT_NAME [3]
ANNHIT_USER_HANDLE [4]
ANNHIT_ROTATE_HANDLE [5]
ANNHIT_MULTISELECT_HANDLE [6]
ANNHIT_MULTISELECT_ROTATE_HANDLE [7]
ANNHIT_MULTISELECT_BODY [8]

If (*puResult) is updated with ANNHIT_HANDLE or ANNHIT_USER_HANDLE, then pHitTestInfo contains additional information about the annotation object handle. For example, if (*puResult) is ANNHIT_ROTATE_HANDLE, pHitTestInfo->nHandleID will be either ROTATE_HANDLE_CENTER_ID[100] or ROTATE_HANDLE_GRIPPER_ID[101] to identify which rotate handle was hit.

pHANNOBJECT phObjectHit

Address of the variable to be updated with the handle to the annotation object that is found at the specified point.

pANNHITTESTINFO pHitTestInfo

Pointer to a ANNHITTESTINFO structure that provides hit test information whenever (*puResult) is updated with ANNHIT_HANDLE or ANNHIT_USER_HANDLE.

L_UINT uStructSize

Size in bytes, of the structure pointed to by pHitTestInfo, for versioning. Use sizeof(ANNHITTESTINFO).

Returns

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

Comments

Before calling this function, you must declare a variable of data type HANNOBJECT. You can then pass the address of the variable in the phObjectHit parameter, which this function will update with the handle of the object located at the specified point.

Required DLLs and Libraries

Platforms

Win32, x64.

See Also

Functions

Topics

Example

This example uses the caller’s mouse coordinates to get the handle to the annotation object at the specified coordinates. The part of the clicked annotation is displayed in the Output window. If the result of the hit test is a user handle, additional information about the handle is displayed.

L_INT AnnHitTestExample(HANNOBJECT    hContainer, 
                                           POINT         ptPointToTest) 
{ 
   L_TCHAR        szMsg[200]; 
   L_TCHAR        szHitTestInfo[200]; 
   ANNHITTESTINFO HitTestInfo; 
   L_TCHAR*       pszResult = TEXT(""); 
   L_INT          nRet; 
   // This function determines which annotation object you have clicked. 
   HANNOBJECT     hObject;  // Local variable for the annotation object  
   L_UINT         uResult; // Result of the test  
 
   // Get the object at the specified point 
   memset(&HitTestInfo, 0, sizeof(ANNHITTESTINFO)); 
   HitTestInfo.uStructSize = sizeof(ANNHITTESTINFO); 
   nRet = L_AnnHitTest(hContainer, &ptPointToTest, &uResult, &hObject, &HitTestInfo, sizeof(ANNHITTESTINFO)); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   switch(uResult) 
   { 
   case ANNHIT_NONE: 
      pszResult = TEXT("ANNHIT_NONE"); 
      break; 
 
   case ANNHIT_BODY: 
      pszResult = TEXT("ANNHIT_BODY"); 
      break; 
 
   case ANNHIT_NAME: 
      pszResult = TEXT("ANNHIT_NAME"); 
      break; 
 
   case ANNHIT_HANDLE: 
      wsprintf(szHitTestInfo, TEXT("ANNHIT_HANDLE nHandleIndex[%d], nHandleID[%d]"),  
         HitTestInfo.nHandleIndex, HitTestInfo.nHandleID); 
      pszResult = szHitTestInfo; 
      break; 
 
   case ANNHIT_USER_HANDLE: 
      wsprintf(szHitTestInfo, TEXT("ANNHIT_USER_HANDLE nHandleIndex[%d], nHandleID[%d]"),  
         HitTestInfo.nHandleIndex, HitTestInfo.nHandleID); 
      pszResult = szHitTestInfo; 
      break; 
   } 
 
   wsprintf(szMsg, TEXT("[%x] %s\n"), hObject, pszResult); 
   OutputDebugString(szMsg); 
   return SUCCESS; 
} 

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