请各位帮忙

yang611 · 发表于 2006-8-10 12:54:00

提示用户选择两个点，将两点联成直线
为何不能实现啊，代码如下：
ads_point startPt, endPt;
acedGetPoint(NULL,"\nLocate start point : ", startPt);
acedGetPoint(NULL,"\nLocate end point : ", endPt);
  AcDbLine *pLine = new AcDbLine(startPt,endPt);
//error C2664: '__thiscall AcDbLine::AcDbLine(const class AcGePoint3d &,const class AcGePoint3d &)' : cannot convert parameter 1 from 'double [3]' to 'const class AcGePoint3d &'
      Reason: cannot convert from 'double [3]' to 'const class AcGePoint3d'
      No constructor could take the source type, or constructor overload resolution was ambiguous
请各位帮忙指点一二

shinjikun · 发表于 2006-8-13 23:09:00

第一点，AcDbLine接受的不是ads_point而是AcGePoint3d,要把ads_point 转换为AcGePoint3d，可以这样写：
(假定 ads_point s;AcGePoint3d p;)
p.set(s[0],s[1],s[2]);
但是你得程序可以有更快的写法：
AcDbLine *pLine = new AcDbLine(*(AcGePoint3d*)startPt,*(AcGePoint3d*)endPt);
第二点，你必须把你的图元加入到数据库中才行，这个可以参考SDK上的写法：
AcDbBlockTable *pBlockTable;
  acdbHostApplicationServices()->workingDatabase()
->getSymbolTable(pBlockTable, AcDb::kForRead);
  AcDbBlockTableRecord *pBlockTableRecord;
  pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord,
AcDb::kForWrite);
  pBlockTable->close();
  AcDbObjectId lineId;
  pBlockTableRecord->appendAcDbEntity(lineId, pLine);
  pBlockTableRecord->close();
  pLine->close();

请各位帮忙

发表回复

精选推荐