RE: How to use codes to open the AcccuDraw

tank you ,these functions:
mdlAccuDraw_setEnabledState(true);

Dpoint3d xAxisVec,pt1,pt2;
double length = mdlVec_computeNormal(&xAxisVec, &pt2, &pt1);
mdlState_setAccudrawContext(DgnPlatform::ACCUDRAW_SetNormal, &pt1, NULL, NULL, NULL, &xAxisVec);