用AcedGrRead()函数实现一拖多
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;
pt.y=pnt;
pt.z=pnt;
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;
pt.y=result.resval.rpoint;
pt.z=result.resval.rpoint;
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,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;
ptOnArc.y=result.resval.rpoint;
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,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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