如何使标注与所标直线平行

double dbAngle = ptBegin.GetPoint().GetAngle(ptEnd.GetPoint()); // 线段的角度

McGeVector2d verVert = McGeVector2d(cos(dAngle), sin(dAngle)).GetVerticalUnit(); //偏移的方向

if (VerAlign == mcVerticalAlignmentTop)

{

ptInsert.Offset( verVert * ((DIMTXTHEIGHT+DIMTXTOFFSETLINE) * dScale));//偏移

}

if (VerAlign == mcVerticalAlignmentBottom || VerAlign == mcVerticalAlignmentBaseline)

{

VerAlign = mcVerticalAlignmentTop;

double dTxtOffset = -(/*DIMTXTHEIGHT +*/ DIMTXTOFFSETLINE) * dScale;

ptInsert.Offset(verVert * dTxtOffset);//偏移

}