LAnnPolygon::GetPoints

#include "ltwrappr.h"

virtual L_INT LAnnPolygon::GetPoints(pPoints)

pointer to an array

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

Parameter	Description
pPoints	Pointer to the array to be filled with the vertices of the object.

Returns

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

Comments

You can use the LAnnPolygon::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

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.

Platforms

Win32, x64.

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 LAnnPolygon_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 ) 
   { 
      LAnnPolygon   LeadPolygon(hObject) ; 
      // first, get the # of points in the object 
      uCount = LeadPolygon.GetPointCount (); 
      LeadBuffer.Reallocate(sizeof(ANNPOINT) * uCount); 
      pPoints = (pANNPOINT)LeadBuffer.Lock() ; 
      // Now, get the points 
      LeadPolygon.GetPoints(pPoints); 
      // Get the defining rect, and find the center point 
      LeadPolygon.GetRect ( &rcDefine ); 
      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 = LeadPolygon.SetPoints ( pPoints, uCount); 
      if(nRet != SUCCESS) 
         return nRet; 
      LeadBuffer.Unlock() ; 
   } 
   return SUCCESS; 
}

Help Version 19.0.2017.10.27

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LEADTOOLS Raster Imaging C++ Class Library Help

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Summary of Features

Functions:	Class Members
Topics:	Annotation Functions: Getting and Setting Geometric Properties
	Annotation Functions: Using Window Coordinates to Define an Object