Question

多段线在MxDrawCAD控件下为一个实体类：

class ARXDLL McDbPolyline : public McDbCurve

通过调用多段线实体类的构造函数：

// -------------------------------------------------------------------------
// Summary:
//  构造函数
// -------------------------------------------------------------------------
McDbPolyline(PolylineType type = kLwPolyline);
 
McDbPolyline(unsigned int num_verts);

初始化多段线实体，可使用默认的构造函数，如下：

	//使用PL话矩形
	auto DrawRect = []() ->McDbPolyline*
	{

		McDbPolyline * pEnt = new McDbPolyline;
		//添加一些端点
		pEnt->addVertexAt(McGePoint2d(10, 0));
		pEnt->addVertexAt(McGePoint2d(10, 10));
		pEnt->addVertexAt(McGePoint2d(0, 10));
		pEnt->addVertexAt(McGePoint2d(0, 0));

		//设置闭合
		pEnt->setClosed(true);

		return pEnt;
	};

	//使用PL画箭头
	auto DrawTriangle = []()->McDbPolyline*
	{
		McDbPolyline * pEnt = new McDbPolyline;
		//添加一些端点
		pEnt->addVertexAt(McGePoint2d(0, 0));
		pEnt->addVertexAt(McGePoint2d(10, 0));
		pEnt->addVertexAt(McGePoint2d(20, 0));
		pEnt->setWidthsAt(1, 5, 0);

		return pEnt;
	};

	McGeMatrix3d mMatrix;

	mMatrix.setTranslation(McGeVector3d(0, 0, 0));
	SetEnt<McDbPolyline>(256, _T("ByLayer"), DrawRect(), nullptr, [&](McDbPolyline * pFuncEnt) {
		pFuncEnt->transformBy(mMatrix);
	});//颜色随层，线型随层

	mMatrix.setTranslation(McGeVector3d(11, 0, 0));
	SetEnt<McDbPolyline>(0, _T("ByBlock"), DrawRect(), nullptr, [&](McDbPolyline * pFuncEnt) {
		pFuncEnt->transformBy(mMatrix);
	});//颜色随块，线型随块

	mMatrix.setTranslation(McGeVector3d(0, 14, 0));
	SetEnt<McDbPolyline>(2, _T("Continuous"), DrawTriangle(), nullptr, [&](McDbPolyline * pFuncEnt) {
		pFuncEnt->transformBy(mMatrix);
	});//黄色，BORDER线型