MSCE C++官网一步步学习搬运3 第三章、在MDL应用中创建元素

/*-------------------------------------------------------------+
|   HelloWorld.cpp                                                |
+-------------------------------------------------------------*/
#include <MstnMdlApiMdlApi.h>
#include <DgnPlatformDgnPlatformApi.h>

USING_NAMESPACE_BENTLEY_DGNPLATFORM
USING_NAMESPACE_BENTLEY_MSTNPLATFORM
USING_NAMESPACE_BENTLEY_MSTNPLATFORM_ELEMENT

double g_1mu;

void createALine(DPoint3dCR basePt)
{
	EditElementHandle eeh;
	DSegment3d seg;
	seg.Init(basePt, DPoint3d::From(basePt.x + g_1mu * 2, basePt.y + g_1mu));
	ICurvePrimitivePtr pCurve = ICurvePrimitive::CreateLine(seg);
	DraftingElementSchema::ToElement(eeh, *pCurve, nullptr, ACTIVEMODEL->Is3d(), *ACTIVEMODEL);
	eeh.AddToModel();
}

void createAComplexShape(DPoint3dCR basePt)
{
	EditElementHandle eeh;
	DPoint3d         pts[3];

	pts[0] = pts[1] = pts[2] = basePt;
	pts[1].x += g_1mu*0.3;    pts[1].y += g_1mu*0.7;
	pts[0].x += g_1mu;        pts[0].y += g_1mu;
	DEllipse3d arcPts = DEllipse3d::FromPointsOnArc(pts[2], pts[1], pts[0]);
	CurveVectorPtr pCurveVec = CurveVector::Create(CurveVector::BOUNDARY_TYPE_Outer);
	pCurveVec->Add(ICurvePrimitive::CreateArc(arcPts));

	pts[1].x = pts[0].x;    pts[1].y = pts[2].y;
	pCurveVec->Add(ICurvePrimitive::CreateLineString(pts, 3));
	DraftingElementSchema::ToElement(eeh, *pCurveVec, nullptr, ACTIVEMODEL->Is3d(), *ACTIVEMODEL);
	eeh.AddToModel();
}

void createAProjectedSolid(DPoint3dCR basePt)
{
	DPoint3d  pts[6];
	pts[0] = basePt;
	pts[1].x = pts[0].x;               pts[1].y = pts[0].y - g_1mu / 2;   pts[1].z = pts[0].z;
	pts[2].x = pts[1].x + g_1mu / 2;   pts[2].y = pts[1].y;               pts[2].z = pts[0].z;
	pts[3].x = pts[2].x;               pts[3].y = pts[2].y - g_1mu / 2;   pts[3].z = pts[0].z;
	pts[4].x = pts[3].x + g_1mu / 2;   pts[4].y = pts[3].y;               pts[4].z = pts[0].z;
	pts[5].x = pts[4].x;               pts[5].y = pts[0].y;               pts[5].z = pts[0].z;

	CurveVectorPtr pCurveVec = CurveVector::CreateLinear(pts, 6, CurveVector::BOUNDARY_TYPE_Outer);
	DVec3d extrusionVec = DVec3d::From(0, 0, g_1mu);
	DgnExtrusionDetail  data(pCurveVec, extrusionVec, true);
	ISolidPrimitivePtr pSolid = ISolidPrimitive::CreateDgnExtrusion(data);
	EditElementHandle eeh;
	DraftingElementSchema::ToElement(eeh, *pSolid, nullptr, *ACTIVEMODEL);
	eeh.AddToModel();
}

void createABsplineSurface(DPoint3dCR basePt)
{
	MSBsplineSurface bsSurface;
	MSBsplineCurve   bsCurves[4];
	DPoint3d         center[4];
	RotMatrix        rMatrix[4];
	double           radius = g_1mu / 2;

	center[0] = center[1] = center[2] = center[3] = basePt;
	center[0].x += radius;
	center[1].x += g_1mu;     center[1].y += radius;
	center[2].x += radius;    center[2].y += g_1mu;
	center[3].y += radius;

	DVec3d xVec = DVec3d::From(1, 0, 0), negativeXVec = DVec3d::From(-1, 0, 0);
	DVec3d yVec = DVec3d::From(0, 1, 0), negativeYVec = DVec3d::From(0, -1, 0);
	DVec3d zVec = DVec3d::From(0, 0, 1);
	rMatrix[0].InitFrom2Vectors(xVec, zVec);  //Front View
	rMatrix[1].InitFrom2Vectors(yVec, zVec);  //Right View
	rMatrix[2].InitFrom2Vectors(negativeXVec, zVec);  //Back View
	rMatrix[3].InitFrom2Vectors(negativeYVec, zVec);  //Left View

	EditElementHandle eeh;
	for (int i = 0; i<4; i++)
	{
		bsCurves[i].InitEllipticArc(center[i], radius, radius, 0, PI, &rMatrix[i]);
	}
	if (SUCCESS == mdlBspline_coonsPatch(&bsSurface, bsCurves))
	{
		DraftingElementSchema::ToElement(eeh, bsSurface, nullptr, *ACTIVEMODEL);
		eeh.AddToModel();
		mdlBspline_freeSurface(&bsSurface);
	}
	for (int i = 0; i<4; i++)
		mdlBspline_freeCurve(&bsCurves[i]);
}

extern "C" DLLEXPORT void MdlMain(int argc, WCharCP argv[])
{
	ModelInfoCP pInfo = ACTIVEMODEL->GetModelInfoCP();
	g_1mu = pInfo->GetUorPerStorage();

	DPoint3d basePt = DPoint3d::FromZero();
	createALine(basePt);
	basePt.x += g_1mu*1.7;     basePt.y -= g_1mu*0.3;    basePt.z -= g_1mu*0.6;
	createAComplexShape(basePt);
	basePt.x += g_1mu*1.5;     basePt.y -= g_1mu*0.3;    basePt.z -= g_1mu*0.6;
	createAProjectedSolid(basePt);
	basePt.x += g_1mu*2.2;     basePt.y -= g_1mu*1.7;    basePt.z -= g_1mu*0.6;
	createABsplineSurface(basePt);
}