LAnnCurveClosed::GetPoints

#include "ltwrappr.h"

virtual L_INT LAnnCurveClosed::GetPoints(pPoints)

Fills the specified array of ANNPOINT structures with the vertices of the annotation object.

Returns

Comments

You can use the LAnnCurveClosed::GetPointCount function to determine the required size of the array before calling this function.

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.

Required DLLs and Libraries

See Also

Example

This example gets the points for an object, shrinks the object by 1/2

and then puts the points back to the object.

L_INT LAnnCurveClosed_GetPointsExample(HWND hwnd, LAnnContainer& LeadContainer, 
																			L_BOOL fDoubleClick, L_INT x, L_INT y, L_UINT keyFlags)
{
   UNREFERENCED_PARAMETER(keyFlags);
   UNREFERENCED_PARAMETER(fDoubleClick);
   UNREFERENCED_PARAMETER(hwnd);
   L_INT nRet;
   HANNOBJECT     hObject; // Local variable for the annotation object 
   POINT          PointToTest; // The point in the window's client area to test 
   L_UINT         TestResult; // Result of the test 
   pANNPOINT pPoints; // Pointer to the points in the object
   L_UINT  uCount;  // Number of points in the object 
   L_INT  i;
   ANNRECT rcDefine;// Defining rectangle for the object 
   L_DOUBLE cx; // Center x point
   L_DOUBLE cy; // Center y point
   LBuffer LeadBuffer ;
   ANNHITTESTINFO HitTestInfo; 
   memset(&HitTestInfo, 0, sizeof(ANNHITTESTINFO)); 
   HitTestInfo.uStructSize = sizeof(ANNHITTESTINFO); 
   
   // Did we hit an object? 
   // Use incoming coordinates to specify the point to test 
   PointToTest.x = x;
   PointToTest.y = y;
   // Get the object at the specified point 
   nRet = LeadContainer.HitTest( &PointToTest, &TestResult, &hObject, &HitTestInfo, sizeof(ANNHITTESTINFO));
   if(nRet != SUCCESS)
      return nRet;
   if ( TestResult == ANNHIT_BODY )
   {
      LAnnCurveClosed   LeadCurveClosed(hObject) ;
      // first, get the # of points in the object
      uCount = LeadCurveClosed.GetPointCount();
      LeadBuffer.Reallocate(sizeof(ANNPOINT) * uCount);
      pPoints = (pANNPOINT)LeadBuffer.Lock() ;
      // Now, get the points 
      nRet = LeadCurveClosed.GetPoints(pPoints);
      if(nRet != SUCCESS)
         return nRet;
      
      // Get the defining rect, and find the center point
      nRet = LeadCurveClosed.GetRect ( &rcDefine );
      if(nRet != SUCCESS)
         return nRet;
      cx = (rcDefine.right + rcDefine.left) / 2;
      cy = (rcDefine.bottom + rcDefine.top) / 2;
      for (i=0; i<(L_INT)uCount; i++)
      {
         pPoints[i].x += (cx - pPoints[i].x) / 2;
         pPoints[i].y += (cy - pPoints[i].y) / 2;
      }
      // Put the new points back into the object
      nRet = LeadCurveClosed.SetPoints ( pPoints, uCount);
      if(nRet != SUCCESS)
         return nRet;
      LeadBuffer.Unlock() ;
   }
   else
      return FAILURE; 
   return SUCCESS;
}