LAnnotation::Define2

#include "ltwrappr.h"

virtual L_INT LAnnotation::Define2(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.

Returns

Comments

This function is used only with the following states:

ANNDEFINE_SETANCHORPOINT 

ANNDEFINE_BEGINMOVEPOINT 

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 LAnnotation::Define, except that LAnnotaion::Define2 takes a point in container coordinates, whereas LAnnotation::Define 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 LAnnotation::Define.

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:

This can be done by using only LAnnotation::Define, but because LAnnotation::Define 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 LAnnotation::Define2 and LAnnotation::Define as follows:

L_VOID ExampleDefine2(LAnnotation *LAnnObject)
{
   ANNPOINT aptAnchor; 
   ANNPOINT aptMove; 
   ANNPOINT ptLocation; 
   aptMove.x = 10.2; 
   aptMove.y = 10.5; 
   aptAnchor.x = 10.2; 
   aptAnchor.y = 50.5; 
   ptLocation.x = 10; 
   ptLocation.y = 20; 

   LAnnObject->Define2(&aptAnchor, ANNDEFINE_SETANCHORPOINT); 
   LAnnObject->Define2(&aptMove, ANNDEFINE_BEGINROTATE); 
   // One or more ANNDEFINE_APPEND
   LAnnObject->Define(&ptLocation, ANNDEFINE_APPEND); 
   LAnnObject->Define(&ptLocation, ANNDEFINE_END); 
}

Required DLLs and Libraries

See Also

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.

// Intially the rectangle must not be rotated.

L_INT LAnnotation_Define2Example(LAnnRectangle *pLRect) 
{
   L_INT nRet;
   // Counter for simulating user input
   static 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; 
   LAnnContainer LTmpContainer; 
   uType = pLRect->GetType();
   if (uType != ANNOBJECT_RECT) 
   {
      MessageBox(NULL, TEXT("Object must be a rectangle"), TEXT("Error"), MB_OK); 
      return FAILURE; 
   }
   nRet = pLRect->GetRotateAngle(&dAngle); 
   if(nRet != SUCCESS)
      return nRet;
   if (dAngle != 0) 
   {
      MessageBox(NULL, TEXT("Object must not be rotated"), TEXT("Error"), MB_OK); 
      return FAILURE; 
   }
   ++nCallCount; 
   switch (nCallCount) 
   {
   case 1: 
      nRet = pLRect->GetRect(&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 = pLRect->Define2(&aptAnchor, ANNDEFINE_SETANCHORPOINT); 
      if(nRet != SUCCESS)
         return nRet;
      nRet = pLRect->Define2(&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 = pLRect->GetRect(&arcRect, NULL); 
      if(nRet != SUCCESS)
         return nRet;
      aptMove.x = arcRect.right; 
      aptMove.y = arcRect.top; 
      nRet = pLRect->GetTopContainer(<mpContainer); 
      if(nRet != SUCCESS)
         return nRet;
      nRet = LTmpContainer.Convert(&ptMove, &aptMove, 1, ANNCONVERT_TO_CLIENT); 
      if(nRet != SUCCESS)
         return nRet;
      nRet = pLRect->Define(&ptMove, ANNDEFINE_END); 
      if(nRet != SUCCESS)
         return nRet;
      nCallCount = 0; 
      MessageBox(NULL, TEXT("Rotate/resize finished!"), TEXT(""), MB_OK); 
      break; 
   }
   return SUCCESS; 
}