[ARX函数]：BOOL filterMouse(MSG *pMsg) 取坐标为何与状态栏的现实有一定的误差？

empireman

BOOL filterMouse(MSG *pMsg)
{   
if( pMsg->message == WM_MOUSEMOVE )   
{        
  acedDwgPoint cpt;        
  ads_point ptDCS, ptWCS, norm;        
  AcGePoint3d  origin;        
  AcGeVector3d e0, e1, e2;        
  AcGeMatrix3d  matUcs2Wcs, matWcs2Ucs;        
  // 1: Get the Mouse coords in DCS        
  CPoint cPnt (pMsg->lParam) ;        
  acedCoordFromPixelToWorld (cPnt, cpt) ;        
  acdbPointSet ( cpt, ptDCS );            
  //acutPrintf ( "\nMouse in Ucs %f, %f, %f",  ptDCS[X], ptDCS[Y],ptDCS[Z] );      
   //return FALSE;        
  // 2: Transform the Mouse coords from DCS to WCS        
  // For this we use the    acdbEcs2Ucs  function with the         
  // value of the VIEWDIR system variable as the input normalvector of ECS        
  // (Sure we have to transform the VIEWDIR value from UCS to WCS        
  struct resbuf rbview;        
  acedGetVar( "viewdir", &rbview );        
  ads_point_set( rbview.resval.rpoint, norm );        
  // If the view direction is 0, 0, 1, then acedCoordFromPixelToWorld()        
  // needs special handling -> we only have to translate the thepoint      
   // by the distance the origin of the current UCS was moved        
  double tol = 1e-10;        
  if ((fabs(norm[X]) < tol) && (fabs(norm[Y]) < tol) &&((fabs(norm[Z]) - 1.0) < tol))
  {            
   AcGePoint3d acadPt;            
   acadPt.x = cpt[0];            
   acadPt.y = cpt[1];            
   acadPt.z = cpt[2];            
   acdbUcsMatrix ( matUcs2Wcs );                     
   matUcs2Wcs.invert();            
   matUcs2Wcs.getCoordSystem( origin, e0, e1, e2);            
   acadPt += origin.asVector();            
   acutPrintf ( "\nMouse in Ucs %f, %f, %f",  acadPt[X],acadPt[Y], acadPt[Z] );            
   return FALSE;        
  }        
  //transfoming VIEWDIR  to WCS        
  acdbUcs2Wcs ( norm, norm, Adesk::kTrue );        
  // Transforming the mouse coords from DCS to WCS        
  acdbEcs2Wcs( ptDCS, ptWCS, norm, Adesk::kTrue );        
  // 3: Get the Mouse coordinates in UCS        //        
  // For this we have to project the WCS coordinates to the UCSplane using         
  // the VIEWDIR vector as projection direction.        //        
  // Getting the UCS->WCS transformation matrix        
  acdbUcsMatrix ( matUcs2Wcs );                 
  matUcs2Wcs.getCoordSystem( origin, e0, e1, e2);        
  // Creating a plane which lies on the current UCS        
  //        
  AcGePlane thePlane ( origin, e0, e1);        
  AcGePoint3d  pntMouseInWCS( ptWCS[X], ptWCS[Y], ptWCS[Z] );        
  AcGeVector3d vecViewdir( norm [X], norm [Y], norm [Z] );        
  // Making the projection        
  AcGePoint3d resPnt = pntMouseInWCS.project (thePlane, vecViewdir);        
  // Transforming the point coordinates to UCS.        
  matWcs2Ucs = matUcs2Wcs.inverse();        
  resPnt.transformBy ( matWcs2Ucs );        
  //this line prints the same coordinates as the coordinates         
  //shown in  AutoCAD's status bar        
  acutPrintf ( "\nMouse in Ucs %f, %f, %f",  resPnt[X], resPnt[Y],resPnt[Z] );    }   
  return FALSE; // continue
}

wxsong

你将视区放大，会发现差值越来越小

empireman

非常感谢，可有什么办法解决吗？

wxsong

没有办法，提供的只是大约的数字。
要准确的话就提供捕捉或直接输入坐标

empireman

谢谢~~~

xunix

AcEdInputPointMonitor