CAD开发者社区 › 首页 ›AutoCAD开发文档› AutoCAD 2022 开发者帮助 › 查看内容

AutoCAD 2022 开发者帮助

变换函数

2024-5-18 18:49| 发布者: admin| 查看: 290| 评论: 0|原作者: admin|来自: AutoCAD

变换函数

该类提供两个转换函数。该函数将矩阵应用于实体。该函数使实体能够返回应用了转换的自身副本。AcDbEntitytransformBy()getTransformedCopy()

如果实体是均匀缩放和正交的，则函数的默认实现将克隆该实体，然后在克隆的实体上调用该函数。（使用该函数确定输入矩阵是否均匀缩放和正交。AcDbEntity::getTransformedCopy()transformBy()AcGeMatrix3d::isUniScaledOrtho()

若要修改默认行为，请重写自定义实体和函数，它们分别由和调用。subGetTransformedCopy()subTransformBy()getTransformedCopy()transformBy()

自定义类重写函数和函数。当不均匀缩放时，它将成为折线。AsdkPolysubTransformBy()subGetTransformedCopy()AsdkPoly

 Acad::ErrorStatus 
 AsdkPoly::subTransformBy(const AcGeMatrix3d& xform) 
 { 
     // If we're dragging, we aren't really going to change our 
     // data, so we don't want to make an undo recording nor do 
     // we really care if the object's open for write. 
     // 
     if (mDragDataFlags & kCloneMeForDraggingCalled) { 
         mDragDataFlags |= kUseDragCache; 
         mDragPlaneNormal = mPlaneNormal; 
         mDragElevation = mElevation; 
         AcGeMatrix2d xform2d(xform.convertToLocal(mDragPlaneNormal,
          mDragElevation)); 
         mDragCenter = mCenter; 
         mDragCenter.transformBy(xform2d); 
         mDragStartPoint = mStartPoint; 
         mDragStartPoint.transformBy(xform2d); 
         mDragPlaneNormal.normalize(); 
     } else { 
         assertWriteEnabled(); 
         AcGeMatrix2d xform2d(xform.convertToLocal(mPlaneNormal,
          mElevation)); 
         mCenter.transformBy(xform2d); 
         mStartPoint.transformBy(xform2d); 
         mPlaneNormal.normalize(); 
     } 
     return Acad::eOk; 
 }

 // Transform points and create a polyline out of them. 
 // 
 Acad::ErrorStatus AsdkPoly::subGetTransformedCopy( 
     const AcGeMatrix3d& mat, 
     AcDbEntity*& ent) const 
 { 
     assertReadEnabled(); 
     Acad::ErrorStatus es = Acad::eOk; 
  
     AcGePoint3dArray vertexArray; 
     if ((es = getVertices3d(vertexArray)) 
         != Acad::eOk) 
     { 
         return es; 
     } 
  
     for (int i = 0; i < vertexArray.length(); i++) { 
         vertexArray[i].transformBy(mat); 
     } 
  
     AcDbSpline *pSpline = NULL; 
     if ((es = rx_makeSpline(vertexArray, pSpline)) 
         != Acad::eOk) 
     { 
         return es; 
     } 
     assert(pSpline != NULL); 
     pSpline->setPropertiesFrom(this); 
  
     ent = pSpline; 
     return es; 
 }