c++ Arx二次开发创建多段线
4、c++ Arx二次开发创建多段线一、本节课程
c++ Arx二次开发创建多段线
二、本节要讲解的知识点
如何应用C++ ARX二次开发创建多段线（AcDbPolyline、AcDb2dPolyLine、AcDb3dPolyline的使用）
三、具体内容
1、ARX提供了三种多段线相关的类：AcDbPolyline、AcDb2dPolyLine、AcDb3dPolyline。PLINE 创建的是AcDbPolyline，3DPOLY创建AcDb3dPolyline。创建一般的轻量多段线只需要调用AcDbPolyline的构造函数即可，创建矩形、正多边形、圆形、圆环对象，关键在于顶点和凸度的确定。
2、添加多段线对象的函数实现：
AcDbObjectId CPolylineUtil::Add(const AcGePoint2dArray &points,double width)
{
int numVertices=points.length();
AcDbPolyline *pPoly=new AcDbPolyline(numVertices);
for (int i=0;i<numVertices;i++)
{
pPoly->addVertexAt(i,points.at(i),0,width,width);
}
return CDwgDatabaseUtil::PostToModelSpace(pPoly);
}
AcDbObjectId CPolylineUtil::Add(const AcGePoint2d &ptStart,const AcGePoint2d &ptEnd,double width)
{
AcGePoint2dArray points;
points.append(ptStart);
points.append(ptEnd);
return Add(points,width);
}
AcDbObjectId CPolylineUtil::Add3dPolyline(const AcGePoint3dArray &points)
{
AcGePoint3dArray verts=points;
AcDb3dPolyline *pPoly3d=new AcDb3dPolyline(AcDb::k3dSimplePoly,verts);
return CDwgDatabaseUtil::PostToModelSpace(pPoly3d);
}
AcDbObjectIdCPolylineUtil::AddPolygon(const AcGePoint2d &ptCenter,int number,double radius,double rotation,double width)
{
double angle=2*CMathUtil::PI()/(double)number;
AcGePoint2dArray points;
for (int i=0;i<number;i++)
{
AcGePoint2d pt;
pt.x=ptCenter.x+radius*cos(i*angle);
pt.y=ptCenter.y+radius*sin(i*angle);
points.append(pt);
}
AcDbObjectId polyId=Add(points,width);
AcDbEntity *pEnt=NULL;
if (acdbOpenObject(pEnt,polyId,AcDb::kForWrite)==Acad::eOk)
{
AcDbPolyline *pPoly=AcDbPolyline::cast(pEnt);
if (pPoly!=NULL)
{
pPoly->setClosed(Adesk::kTrue);
}
pEnt->close();
}
EntityUtil::Rotate(polyId,ptCenter,rotation);
return polyId;
}
AcDbObjectId CPolylineUtil::AddRectangle(const AcGePoint2d &pt1,const AcGePoint2d &pt2,double width)
{
double x1=pt1.x,x2=pt2.x;
double y1=pt1.y,y2=pt2.y;
AcGePoint2d ptLeftBottom(min(x1,x2),min(y1,y2));
AcGePoint2d ptRightBottom(max(x1,x2),min(y1,y2));
AcGePoint2d ptRightTop(max(x1,x2),max(y1,y2));
AcGePoint2d ptLeftTop(min(x1,x2),max(y1,y2));
AcDbPolyline *pPoly=new AcDbPolyline(4);
pPoly->addVertexAt(0,ptLeftBottom,0,width,width);
pPoly->addVertexAt(1,ptRightBottom,0,width,width);
pPoly->addVertexAt(2,ptRightTop,0,width,width);
pPoly->addVertexAt(3,ptLeftTop,0,width,width);
pPoly->setClosed(true);
return CDwgDatabaseUtil::PostToModelSpace(pPoly);
}
AcDbObjectId CPolylineUtil::AddPolyCircle(const AcGePoint2d &ptCenter,double radius,double width)
{
AcGePoint2d pt1,pt2,pt3;
pt1.x=ptCenter.x+radius;
pt1.y=ptCenter.y;
pt2.x=ptCenter.x-radius;
pt2.y=ptCenter.y;
pt3.x=ptCenter.x+radius;
pt3.y=ptCenter.y;
AcDbPolyline *pPoly=new AcDbPolyline(3);
pPoly->addVertexAt(0,pt1,1,width,width);
pPoly->addVertexAt(1,pt2,1,width,width);
pPoly->addVertexAt(2,pt3,1,width,width);
pPoly->setClosed(Adesk::kTrue);
return CDwgDatabaseUtil::PostToModelSpace(pPoly);
}
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