• 创建多段线

    函数申明：

    1 //多段线
2     static AcDbObjectId CreatePolyline(AcGePoint2dArray pts, double width=0);    //创建多段线
3     static AcDbObjectId CreatePolyLine(AcGePoint2d ptStart, AcGePoint2d ptEnd, double width);    //利用多段线创建直线
4     static AcDbObjectId Create3dPolyline(AcGePoint3dArray pts3d);    //多点创建三维多段线
5     static AcDbObjectId CreatePolygon(AcGePoint2d ptCenter, int number ,double radius, double rotateAng, double width);     //创建多边形
6     static AcDbObjectId CreateRectangle(AcGePoint2d pt1, AcGePoint2d pt2, double width);    //创建矩形
7     static AcDbObjectId CreatePolyCircle(AcGePoint2d ptCenter, double radius, double width);    //创建圆
8     static AcDbObjectId CreatePolyArc(AcGePoint2d ptCenter, double radius, double startAng, double endAng, double width);    //创建圆弧

    创建多段线函数：

     1 AcDbObjectId CCreateEnt::CreatePolyline(AcGePoint2dArray pts, double width/* =0 */)
 2 {
 3     int numVertices = pts.length();    //顶点个数
 4     AcDbPolyline* pPolyline = new AcDbPolyline(numVertices);    //多段线
 5     for(int i=0;i<numVertices;i++)
 6     {
 7         pPolyline->addVertexAt(i,pts.at(i),0,width,width);    //插入定点，凸度为0
 8     }
 9     return CCreateEnt::PostToModelSpace(pPolyline);    //添加到模型空间
10 }

    利用多段线创建直线:

    1 AcDbObjectId CCreateEnt::CreatePolyLine(AcGePoint2d ptStart, AcGePoint2d ptEnd, double width)
2 {
3     AcGePoint2dArray pts;
4     pts.append(ptStart);    //直线起点
5     pts.append(ptEnd);    //终点
6 
7     return CCreateEnt::CreatePolyline(pts,width);
8 }

    利用多段线创建矩形：

     1 AcDbObjectId CCreateEnt::CreateRectangle(AcGePoint2d pt1, AcGePoint2d pt2, double width)
 2 {
 3     double x1=pt1.x,x2= pt2.x;
 4     double y1=pt1.y,y2=pt2.y;
 5 
 6     AcGePoint2d pLB(CCalculation::Min(x1,x2),CCalculation::Min(y1,y2));    //左下角点
 7     AcGePoint2d pRB(CCalculation::Max(x1,x2),CCalculation::Min(y1,y2));    //右下角点
 8     AcGePoint2d pRT(CCalculation::Max(x1,x2),CCalculation::Max(y1,y2));    //右上角点
 9     AcGePoint2d pLT(CCalculation::Min(x1,x2),CCalculation::Max(y1,y2));    //左上角点
10 
11     AcGePoint2dArray pts;
12     AcDbPolyline* pPolyline= new AcDbPolyline(4);
13     pPolyline->addVertexAt(0,pLB,0,width,width);
14     pPolyline->addVertexAt(1,pRB,0,width,width);
15     pPolyline->addVertexAt(2,pRT,0,width,width);
16     pPolyline->addVertexAt(3,pLT,0,width,width);
17     pPolyline->setClosed(Adesk::kTrue);    //使多段线闭合
18 
19     return CCreateEnt::PostToModelSpace(pPolyline);
20 
21 }

    利用多段线创建正多边形：

     1 AcDbObjectId CCreateEnt::CreatePolygon(AcGePoint2d ptCenter, int number ,double radius, double rotateAng, double width) //中心点，边数，初始角度，旋转角度，线宽
 2 {
 3     AcGePoint2dArray pts;
 4     double rad= 2*CCalculation::PI()/number;    //获取角度
 5 
 6     for (int i=0;i<number;i++)    //获取多边形的各个定点
 7     {
 8         AcGePoint2d pt;
 9         pt.x= ptCenter.x+radius*cos(i*rad);
10         pt.y = ptCenter.y+radius*sin(i*rad);
11         pts.append(pt);
12 
13     }
14 
15     AcDbObjectId polyId=CCreateEnt::CreatePolyline(pts,width);    //创建正多边形
16 
17     AcDbEntity* pEnt;
18     acdbOpenObject(pEnt,polyId,AcDb::kForWrite);
19     if(pEnt->isKindOf(pEnt->desc()) == Adesk::kTrue)
20     {
21         AcDbPolyline* pPolyline = AcDbPolyline::cast(pEnt);
22         if(NULL != pPolyline)
23         {
24             pPolyline->setClosed(Adesk::kTrue);    //闭合多段线
25             pPolyline->close();
26         }
27     }
28     pEnt->close();
29 
30     CModifyEnt::Rotate(polyId,CCalculation::Pt2dTo3d(ptCenter),rotateAng);    //旋转正多边形
31     return polyId;
32 
33 }

    对象旋转函数如下：

    1 //旋转
2 Acad::ErrorStatus CModifyEnt::Rotate(AcDbObjectId entId, AcGePoint3d ptBase, double rotateAng) //对象ID，基点，旋转角度
3 {
4     AcGeMatrix3d xform;    //旋转矩阵
5     AcGeVector3d vec(0,0,1);    //法向量
6     xform.setToRotation(rotateAng,vec,ptBase);
7 
8     return CModifyEnt::Transform(xform,entId);
9 }

    变换函数如下：

     1     inline static Acad::ErrorStatus Transform(AcGeMatrix3d& xform, AcDbObjectId entId) //变换矩阵，对象ID
 2     {
 3         AcDbEntity* pEnt=0;
 4         Acad::ErrorStatus es;
 5         es = acdbOpenObject(pEnt,entId,AcDb::kForWrite);  //获取对象
 6         if(es == Acad::eOk)
 7         {
 8             pEnt->transformBy(xform);    //变换对象
 9             pEnt->close();
10         }
11         return es;
12     }

    变换函数根据传入不同的变换矩阵，对实体进行变换操作（旋转，平移，缩放）

    利用多段线创建圆

     1 AcDbObjectId CCreateEnt::CreatePolyCircle(AcGePoint2d ptCenter, double radius, double width)   //圆心，半径，线宽
 2 {
 3     AcGePoint2d pt1,pt2,pt3;    //构建圆上3点
 4     pt1.x=ptCenter.x+radius;
 5     pt1.y=pt2.y=pt3.y=ptCenter.y;
 6     pt2.x=ptCenter.x-radius;
 7     pt3.x=ptCenter.x+radius;
 8 
 9     AcDbPolyline* pPolyline = new AcDbPolyline(3);
10     pPolyline->addVertexAt(0,pt1,1,width,width);
11     pPolyline->addVertexAt(1,pt2,1,width,width);
12     pPolyline->addVertexAt(2,pt3,1,width,width);
13     pPolyline->setClosed(Adesk::kTrue);
14 
15     return CCreateEnt::PostToModelSpace(pPolyline);
16 
17 }

    利用多段线创建圆弧:

     1 AcDbObjectId CCreateEnt::CreatePolyArc(AcGePoint2d ptCenter, double radius, double startAng, double endAng, double width) //圆心，起始角度，结束角度，线宽
 2 {
 3     AcGePoint2d pt1,pt2;
 4     pt1.x=ptCenter.x+radius*cos(startAng);
 5     pt1.y=ptCenter.y+radius*sin(startAng);
 6     pt2.x=ptCenter.x+radius*cos(endAng);
 7     pt2.y=ptCenter.y+radius*sin(endAng);
 8 
 9 
10     AcDbPolyline* pPolyline = new AcDbPolyline(2);
11     pPolyline->addVertexAt(0,pt1,tan((endAng-startAng)/4),width,width); //凸度：结束角度与起始角度差值的1/4的tan值
12     pPolyline->addVertexAt(1,pt2,0,width,width);
13 
14     return CCreateEnt::PostToModelSpace(pPolyline);
15     
16 }

    平移对象：

    1 //移动
2 Acad::ErrorStatus CModifyEnt::Move(AcDbObjectId entId, AcGePoint3d ptBase, AcGePoint3d ptDest) 
3 {
4     AcGeMatrix3d xform;
5     AcGeVector3d vec(ptDest.x-ptBase.x,ptDest.y-ptBase.y,ptDest.z-ptBase.z);
6     xform.setToTranslation(vec);   //构建平移矩阵
7 
8     return CModifyEnt::Transform(xform,entId);   //调用变换函数
9 }

    缩放对象：

    1 //放大
2 Acad::ErrorStatus CModifyEnt::Scale(AcDbObjectId entId, AcGePoint3d ptBase, double scaleFactor)    //对象Id，基点，比例因子
3 {
4     AcGeMatrix3d xform;
5     xform.setToScaling(scaleFactor,ptBase);    //构建缩放矩阵
6 
7     return CModifyEnt::Transform(xform,entId);
8 }

    测试函数

     1 public:
 2 
 3     // - CADShellCreateEntsUnmanaged._AddPolyline command (do not rename)
 4     static void CADShellCreateEntsUnmanaged_AddPolyline(void)
 5     {
 6         //直线
 7         AcGePoint2d ptStart(0,0),ptEnd(100,100);
 8         CCreateEnt::CreatePolyLine(ptStart,ptEnd,1);
 9 
10         //三角形
11         AcGePoint2d pt1(0,0),pt2(100,0),pt3(100,100);
12         AcGePoint2dArray pts;
13         pts.append(pt1);
14         pts.append(pt2);
15         pts.append(pt3);
16         CCreateEnt::CreatePolyline(pts,0);    //0不表示线条宽度为0
17 
18         //多边形
19         AcDbObjectId oId=CCreateEnt::CreatePolygon(AcGePoint2d::kOrigin,6,30,CCalculation::G2R(20),1);
20         CModifyEnt::Scale(oId,CCalculation::Pt2dTo3d(AcGePoint2d::kOrigin),5);
21         AcGePoint3d ptDest(100,100,0);
22         //CModifyEnt::Move(oId,CCalculation::Pt2dTo3d(AcGePoint2d::kOrigin),ptDest);
23         //CModifyEnt::Rotate(oId,CCalculation::Pt2dTo3d(AcGePoint2d::kOrigin),CCalculation::G2R(20));
24 
25         //矩形
26         AcGePoint2d pt(60,70);
27         CCreateEnt::CreateRectangle(pt,ptEnd,1);
28 
29         //圆
30         pt.set(50,50);
31         CCreateEnt::CreatePolyCircle(pt,30,1);
32 
33         //弧
34         CCreateEnt::CreatePolyArc(pt,50,CCalculation::G2R(45.),CCalculation::G2R(225.),1);
35 
36     }

    弧度转角度:

    double CCalculation::R2G(double rad)
{
    return rad*180/CCalculation::PI();
}

    角度转弧度：

    1 double CCalculation::G2R(double angle)
2 {
3     return angle*CCalculation::PI()/180;
4 }

    需要重点掌握的函数：

    Acad::ErrorStatus addVertexAt     (unsigned int index,    //顶点序号
                                       const AcGePoint2d& pt,    //顶点
                                       double bulge = 0.,    //凸度
                                       double startWidth = -1.,    //起始宽度
                                       double endWidth = -1);    //结束宽度

    多段线添加顶点，添加完毕后，可以调用setClose使多段线闭合

    inline Acad::ErrorStatus acdbOpenObject(
    AcDbEntity *& pEnt, AcDbObjectId id, AcDb::OpenMode mode)

    根据Id打开对象，mode指定访问模式，pEnt返回对象

    inline bool AcRxObject::isKindOf(const AcRxClass* pOtherClass) const

    判断对象的类型

    static AcRxClass* desc();

    获取对象的类型，参数传递对象指针，一般与isKindof函数一起使用

    AcDbPolyline::cast()

    把对象转化给AcDbPolyline指针

    pPolyline->setClosed(Adesk::kTrue);

    多段线闭合

    xform.setToTranslation(vec);    //设置平移矩阵
    xform.setToScaling(scaleFactor,ptBase);  //设置缩放矩阵
    xform.setToRotation(rotateAng,vec,ptBase); //设置旋转矩阵
    pEnt->transformBy(xform);    //实体根据矩阵变换
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  • 原文地址：https://www.cnblogs.com/estival/p/3124064.html
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