OpenCasCade(十) 拓撲變換

1.1.1      拓撲變換描述

1.1.2      BRepBuilderAPI_Transform

(1)    功能說明：拓撲變換

此對象與gp_Trsf相關聯進行變換

(2)    構造函數：

public OCBRepBuilderAPI_Transform(OCgp_Trsf T);

public OCBRepBuilderAPI_Transform(OCTopoDS_Shape S, OCgp_Trsf T, bool Copy);

(3)    參數說明：

T：要進行的變換

S：進行變換的拓撲圖形

Copy：是否用副本進行變換

(4)    備注：

Perform是該對象的一個方法。

OCBRepBuilderAPI_Transform(OCgp_Trsf T) 與public void Perform(OCTopoDS_Shape S, bool Copy)相等于OCBRepBuilderAPI_Transform(OCTopoDS_Shape S, OCgp_Trsf T, bool Copy)。

(5)    執行個體：

例1：點對稱

OCTopoDS_Shape S;

OCgp_Trsf theTransformation = new OCgp_Trsf();

OCgp_Pnt PntCenterOfTheTransformation = new OCgp_Pnt(110, 60, 60);

              theTransformation.SetMirror(PntCenterOfTheTransformation);//鏡像

OCBRepBuilderAPI_Transform myBRepTransformation =

new OCBRepBuilderAPI_Transform(S, theTransformation, false);

OCTopoDS_Shape S2 = myBRepTransformation.Shape();

例2：軸對稱

OCTopoDS_Shape S ;

OCgp_Trsf theTransformation = new OCgp_Trsf();

OCgp_Ax1 axe = new OCgp_Ax1(new OCgp_Pnt(110, 60, 60), new OCgp_Dir(0.0, 1.0, 0.0));                   

theTransformation.SetMirror(axe);//鏡像

OCBRepBuilderAPI_Transform myBRepTransformation =

new OCBRepBuilderAPI_Transform(S, theTransformation, false);

OCTopoDS_Shape S2 = myBRepTransformation.Shape();

例3：面對稱

OCTopoDS_Shape S = new OCBRepPrimAPI_MakeWedge(60.0, 100.0, 80.0, 20.0).Shape();        

OCgp_Trsf theTransformation = new OCgp_Trsf();

OCgp_Ax2 axe2 = new OCgp_Ax2(new OCgp_Pnt(0, 0, 0), new OCgp_Dir(1, 0, 0));

theTransformation.SetMirror(axe2);//鏡像

OCBRepBuilderAPI_Transform myBRepTransformation =

new OCBRepBuilderAPI_Transform(S, theTransformation, false);

OCTopoDS_Shape S2 = myBRepTransformation.Shape();

例4：旋轉變換

OCTopoDS_Shape S;

OCgp_Trsf theTransformation = new OCgp_Trsf();

OCgp_Ax1 axe = new OCgp_Ax1(new OCgp_Pnt(200, 60, 60), new OCgp_Dir(0.0, 1.0, 0.0));          

theTransformation.SetRotation(axe, 30 * System.Math.PI / 180);

OCBRepBuilderAPI_Transform myBRepTransformation =

new OCBRepBuilderAPI_Transform(S, theTransformation, false);

OCTopoDS_Shape S2 = myBRepTransformation.Shape();

例5：縮放變換

OCTopoDS_Shape S;

OCgp_Trsf theTransformation = new OCgp_Trsf();

OCgp_Pnt theCenterOfScale = new OCgp_Pnt(100, 60, 60);

theTransformation.SetScale(theCenterOfScale, 0.3);

OCBRepBuilderAPI_Transform myBRepTransformation =

new OCBRepBuilderAPI_Transform(S, theTransformation, false);

OCTopoDS_Shape S2 = myBRepTransformation.Shape();

例6：平移變換

OCTopoDS_Shape S;

              OCgp_Trsf theTransformation = new OCgp_Trsf();

OCgp_Vec theVectorOfTranslation = new OCgp_Vec(-6, -6, 6);

 theTransformation.SetTranslation(theVectorOfTranslation);

 OCBRepBuilderAPI_Transform myBRepTransformation =

 new OCBRepBuilderAPI_Transform(S, theTransformation, false);

 OCTopoDS_Shape S2 = myBRepTransformation.Shape();

例7：移位（Displacement）變換

OCTopoDS_Shape S;

OCgp_Trsf theTransformation = new OCgp_Trsf();

OCgp_Ax3 ax3_1 = new OCgp_Ax3(new OCgp_Pnt(0, 0, 0), new OCgp_Dir(0, 0, 1));

OCgp_Ax3 ax3_2 = new OCgp_Ax3(new OCgp_Pnt(60, 60, 60), new OCgp_Dir(1, 1, 1));

theTransformation.SetDisplacement(ax3_1, ax3_2);

OCBRepBuilderAPI_Transform myBRepTransformation =

new OCBRepBuilderAPI_Transform(S, theTransformation, false);

OCTopoDS_Shape TransformedShape = myBRepTransformation.Shape();

1.1.3      BRepBuilderAPI_GTransform

(1)    功能說明：拓撲變換

此對象與gp_GTrsf相關聯進行變換

(2)    構造函數：

public OCBRepBuilderAPI_GTransform(OCgp_GTrsf T);

public OCBRepBuilderAPI_GTransform(OCTopoDS_Shape S, OCgp_GTrsf T, bool Copy);

(3)    參數說明：

T：要進行的變換

S：進行變換的拓撲圖形

Copy：是否用副本進行變換

(4)    執行個體：

例1：變形（deform）變換

OCTopoDS_Shape S;

OCgp_GTrsf theTransformation = new OCgp_GTrsf();

OCgp_Mat rot = new OCgp_Mat(1, 0, 0, 0, 0.5, 0, 0, 0, 1.5);

theTransformation.SetVectorialPart(rot);

// SetVectorialPart-----Replaces the vectorial part of this transformation by Matrix

theTransformation.SetTranslationPart(new OCgp_XYZ(5, 5, 5));

//SetTranslationPart-----

//Replaces the translation part of this transformation by the coordinates

OCBRepBuilderAPI_GTransform myBRepTransformation =

new OCBRepBuilderAPI_GTransform(S, theTransformation, false);

OCTopoDS_Shape S2 = myBRepTransformation.Shape();