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2021年1月1日AutoCAD.Net/C#.NetQQ群:193522571用acedGrRead()函数实现一拖多 ...

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

熟悉了一下acedGrRead()函数的用法之后自己就试着做了一个一拖多的简单动态画图效果,感觉用这个函数实现一拖多比较蠢,比较无脑!
效果图如下:




实现代码:

#include "StdAfx.h"
#include "StdArx.h"
#include "..\..\Common\我的类\Arc.h"
#include <acedads.h>
#include "..\..\Common\Entity\LineUtil.h"
#include <geassign.h>
#include <dbents.h>
#include "..\..\Common\Others\ConvertUtil.h"
#include <gearc2d.h>
#include <dbcurve.h>
#include "..\..\Common\Interaction\SelectUtil.h"
#include "..\..\Common\Document\DwgDatabaseUtil.h"


void ZffMyProjectdrwarc()
{

  AcDbEntity *pEntRef=NULL;
  AcGePoint3d pickPoint;
  AcDbBlockReference *pBlkRef=NULL;
  AcDbObjectId blkDefId;
  AcDbObjectIdArray blkRefIds;
  int i,n=5;
  int track=1,type;
  ads_point pnt;
  AcGePoint3d pt;
  if (CSelectUtil::PromptSelectEntity(TEXT("\n选择块:"),AcDbBlockReference::desc(),pEntRef,pickPoint))
  {
    pBlkRef=AcDbBlockReference::cast(pEntRef);
    blkDefId=pBlkRef->blockTableRecord();
    pEntRef->close();
    pBlkRef->close();
  }
  acedGetPoint(NULL,"\n请输入一点:",pnt);
  pt.x=pnt[X];
  pt.y=pnt[Y];
  pt.z=pnt[Z];
  AcGePoint2d pt12d=CConvertUtil::ToPoint2d(asPnt3d(pnt));
  AcGePoint2d pt22d=CConvertUtil::ToPoint2d(pt);
  AcDbObjectId lineId=CLineUtil::Add(asPnt3d(pnt),pt);
  AcGeVector2d vec=pt22d-pt12d;
  for (i=1;i<n+1;i++)
  {
    pBlkRef=new AcDbBlockReference(CConvertUtil::ToPoint3d(pt12d+i*vec/(n+1)),blkDefId);
    blkRefIds.append(CDwgDatabaseUtil::PostToModelSpace(pBlkRef));
  }
  pBlkRef->close();

  AcDbLine *pLine=NULL;
  struct resbuf result;
  while(track>0)
  {
    acedGrRead(track,&type,&result);
    pt.x=result.resval.rpoint[X];
    pt.y=result.resval.rpoint[Y];
    pt.z=result.resval.rpoint[Z];
    pt12d=CConvertUtil::ToPoint2d(asPnt3d(pnt));
    pt22d=CConvertUtil::ToPoint2d(pt);
    acdbOpenObject(pLine,lineId,AcDb::kForWrite);
    pLine->setEndPoint(pt);
    for (i=0;i<blkRefIds.length();i++)
    {
      acdbOpenObject(pBlkRef,blkRefIds[i],AcDb::kForWrite);
      pBlkRef->setPosition(CConvertUtil::ToPoint3d(pt12d+(i+1)*(pt22d-pt12d)/(n+1)));
      pBlkRef->close();
    }

    if (type==3)
    {
      track=0;
    }
    pLine->close();
  }
  AcGePoint2d ptOnArc;
  AcDbObjectId arcId;
  double startParam=0,endParam=0,paramInterval;
  track=1;
  while (track>0)
  {
    acedGrRead(track,&type,&result);
    ptOnArc.x=result.resval.rpoint[X];
    ptOnArc.y=result.resval.rpoint[Y];
    if (ptOnArc.x!=pt.x||ptOnArc.y!=pt.y)
    {
      if (arcId.isNull())
      {
        acdbOpenObject(pLine,lineId,AcDb::kForWrite);
        pLine->erase();
        pLine->close();
        arcId=CArc::Add(pt12d,pt22d,pt22d);
      }
      AcGeCircArc2d geArc(pt12d, ptOnArc, pt22d);
      AcGePoint2d ptCenter = geArc.center();
      double radius = geArc.radius();
      AcGeVector2d vecStart(pt12d.x - ptCenter.x, pt12d.y - ptCenter.y);
      AcGeVector2d vecEnd(pt22d.x - ptCenter.x, pt22d.y - ptCenter.y);
      double startAngle = vecStart.angle();
      double endAngle = vecEnd.angle();

      AcDbArc *pArc2=new AcDbArc(CConvertUtil::ToPoint3d(ptCenter),radius,startAngle,endAngle);
      AcGePoint3d ptclose;
      pArc2->getClosestPointTo(CConvertUtil::ToPoint3d(ptOnArc),ptclose);
      pArc2->close();
      AcDbArc *pArc=NULL;
      acdbOpenObject(pArc,arcId,AcDb::kForWrite);
      if (CConvertUtil::ToPoint2d(ptclose).distanceTo(ptOnArc)<0.01)
      {
        pArc->setCenter(CConvertUtil::ToPoint3d(ptCenter));
        pArc->setRadius(radius);
        pArc->setStartAngle(startAngle);
        pArc->setEndAngle(endAngle);
      }
      else
      {
        pArc->setCenter(CConvertUtil::ToPoint3d(ptCenter));
        pArc->setRadius(radius);
        pArc->setStartAngle(endAngle);
        pArc->setEndAngle(startAngle);
      }
      AcDbCurve *pCurve=AcDbCurve::cast(pArc);
      pCurve->getStartParam(startParam);
      pCurve->getEndParam(endParam);
      paramInterval=(endParam-startParam)/(n+1);
      for (i=1;i<n+1;i++)
      {
        double param=startParam+i*paramInterval;
        pCurve->getPointAtParam(param,pt);
        acdbOpenObject(pBlkRef,blkRefIds[i-1],AcDb::kForWrite);
        pBlkRef->setPosition(pt);
        pBlkRef->close();
      }
      pCurve->close();
      pArc->close();
      if (type==3)
      {
        track=0;
      }
    }
  }
}




AcDbObjectId CArc::Add(const AcGePoint2d &ptStart,const AcGePoint2d &ptOnArc,const AcGePoint2d &ptEnd)
{
AcGePoint3d ptOnArc1;
AcGeCircArc2d geArc(ptStart, ptOnArc, ptEnd);
AcGePoint2d ptCenter = geArc.center();
double radius = geArc.radius();
double tol=0.01;
// 计算起始和终止角度
AcGeVector2d vecStart(ptStart.x - ptCenter.x, ptStart.y - ptCenter.y);
AcGeVector2d vecEnd(ptEnd.x - ptCenter.x, ptEnd.y - ptCenter.y);
double startAngle = vecStart.angle();
double endAngle = vecEnd.angle();

AcDbArc *pArc=new AcDbArc(CConvertUtil::ToPoint3d(ptCenter), radius, startAngle, endAngle);
pArc->getClosestPointTo(CConvertUtil::ToPoint3d(ptOnArc),ptOnArc1);

if (CConvertUtil::ToPoint2d(ptOnArc1).distanceTo(ptOnArc)<tol)
{
return CDwgDatabaseUtil::PostToModelSpace(pArc);
}
else
{
AcDbArc *pArc2=new AcDbArc(CConvertUtil::ToPoint3d(ptCenter),radius,endAngle,startAngle);
delete pArc;
return CDwgDatabaseUtil::PostToModelSpace(pArc2);

}
}




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