PythonOCC基础使用：建模——二维草图（线/任意/圆弧/圆/椭圆/三角形/矩形/任意多边形/双曲线/抛物线）

水深无声 2021-12-11 00:53 782阅读 0赞

**实现的国产云端CAD** [**www.yuntucad.com**][www.yuntucad.com]

### 圆形 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70]

from OCC.Core.GC import GC_MakeCircle
    from OCC.Core.gp import gp_Pnt
    from OCC.Core.gp import gp_Ax2,gp_Dir
    from OCC.Display.OCCViewer import rgb_color
    #圆形
    Circle=GC_MakeCircle(gp_Ax2 (gp_Pnt(0,0,5),gp_Dir (0,0,-1)),8).Value()
    
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(Circle,update=True,color=rgb_color(0,0,1))
        start_display()

*  线段

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 1]

from OCC.Core.gp import gp_Pnt
    from OCC.Core.GC import GC_MakeSegment
    from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire
    from OCC.Display.OCCViewer import rgb_color
    # 函数作用：通过两点生成线段
    # 输入：两点
    # 输出：线段
    aSegment = GC_MakeSegment(gp_Pnt(1,1,1), gp_Pnt(1,10,1))
    anEdge = BRepBuilderAPI_MakeEdge(aSegment.Value())
    aWire = BRepBuilderAPI_MakeWire(anEdge.Edge())
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(aWire.Shape(), update=True,color=rgb_color(1,0,0))
        start_display()

以及从2d转到3d的方法：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 2]

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeWire, BRepBuilderAPI_MakeEdge
    from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeCylinder
    from OCC.Core.GCE2d import  GCE2d_MakeSegment
    from OCC.Core.GeomAPI import geomapi_To3d
    from OCC.Core.gp import gp_Pnt2d, gp_Pln, gp_Pnt, gp_Dir
    from OCC.Display.SimpleGui import init_display
    
    
    sideLength=20
    l1 = GCE2d_MakeSegment(gp_Pnt2d(-sideLength / 2, sideLength / 2), gp_Pnt2d(sideLength / 2, sideLength / 2))
    l2 = GCE2d_MakeSegment(gp_Pnt2d(sideLength / 2, sideLength / 2), gp_Pnt2d(sideLength / 2, -sideLength / 2))
    l3 = GCE2d_MakeSegment(gp_Pnt2d(sideLength / 2, -sideLength / 2), gp_Pnt2d(-sideLength / 2, -sideLength / 2))
    l4 = GCE2d_MakeSegment(gp_Pnt2d(-sideLength / 2, -sideLength / 2), gp_Pnt2d(-sideLength / 2, sideLength / 2))
    
    
    e1=BRepBuilderAPI_MakeEdge(geomapi_To3d(l1.Value(),gp_Pln(gp_Pnt(0,0,20),gp_Dir(0,0,1)))).Edge()
    e2=BRepBuilderAPI_MakeEdge(geomapi_To3d(l2.Value(),gp_Pln(gp_Pnt(0,0,20),gp_Dir(0,0,1)))).Edge()
    e3=BRepBuilderAPI_MakeEdge(geomapi_To3d(l3.Value(),gp_Pln(gp_Pnt(0,0,20),gp_Dir(0,0,1)))).Edge()
    e4=BRepBuilderAPI_MakeEdge(geomapi_To3d(l4.Value(),gp_Pln(gp_Pnt(0,0,20),gp_Dir(0,0,1)))).Edge()
    
    
    
    
    display, start_display, add_menu, add_function_to_menu = init_display()
    
    square= BRepBuilderAPI_MakeWire(e1,e2,e3,e4)
    
    display.DisplayShape(square.Wire(), update=True)
    
    
    my_box = BRepPrimAPI_MakeCylinder(10., 20.).Shape()
    display.DisplayShape(my_box,update=True)
    
    start_display()

*  三角形
 *  ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 3]

*  圆弧
 *  ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 4]

from OCC.Core.GeomAPI import GeomAPI_Interpolate
    from OCC.Core.TColgp import TColgp_HArray1OfPnt
    from OCC.Core.gp import gp_Pnt, gp_Ax2, gp_Dir, gp_Circ, gp_Elips
    from OCC.Core.GC import GC_MakeSegment, GC_MakeCircle, GC_MakeArcOfCircle, GC_MakeEllipse
    from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire
    # 函数作用：通过圆心和半径和角度生成圆弧
    # 输入：圆心坐标，半径值，角度值
    # 输出：暂定只输出圆弧
    Location = gp_Pnt(0,0,0)
    Axis = gp_Dir (0,0,-1)
    CircleAxis= gp_Ax2(Location, Axis)
    Circle = gp_Circ(CircleAxis,5)
    ArcofCircle0 = GC_MakeArcOfCircle(Circle, 0/180*3.14, 180/180*3.14, True)
    ArcofCircle1 = BRepBuilderAPI_MakeEdge(ArcofCircle0.Value())
    ArcofCircle = BRepBuilderAPI_MakeWire(ArcofCircle1.Edge())
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(ArcofCircle.Edge(),update=True)
        start_display()

*  椭圆
 *  ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 5]

from OCC.Core.GeomAPI import GeomAPI_Interpolate
    from OCC.Core.TColgp import TColgp_HArray1OfPnt
    from OCC.Core.gp import gp_Pnt, gp_Ax2, gp_Dir, gp_Circ, gp_Elips
    from OCC.Core.GC import GC_MakeSegment, GC_MakeCircle, GC_MakeArcOfCircle, GC_MakeEllipse
    from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire
    # 函数作用：通过半长轴和半短轴及原点绘制椭圆
    # 输入：原点坐标，半长轴值，半短轴值
    # 输出：暂定只输出椭圆
    Location = gp_Pnt(0,0,0)
    Axis = gp_Dir(0,0,1)
    ElipsAxis= gp_Ax2(Location, Axis)
    ElipsAxis0 = gp_Elips(ElipsAxis, 9, 3)
    ElipsAxis1 = BRepBuilderAPI_MakeEdge(ElipsAxis0)
    ElipsAxis = BRepBuilderAPI_MakeWire(ElipsAxis1.Edge())
    
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(ElipsAxis.Edge(),update=True)
        start_display()

*  绘制双曲线hyperbola  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 6]

from OCC.Core.GCE2d import GCE2d_MakeHyperbola
    from OCC.Core.gp import gp_Pnt, gp_Ax2d, gp_Pnt2d, gp_Dir2d
    from OCC.Display.SimpleGui import init_display
    
    
    MajorRadius=5
    MinorRadius=1
    hyperbola=GCE2d_MakeHyperbola(gp_Ax2d(gp_Pnt2d(0 , 0.2),gp_Dir2d(0,1)),MajorRadius,MinorRadius,False)
    
    
    display, start_display, add_menu, add_function_to_menu = init_display()
    
    display.DisplayShape(hyperbola.Value(),update=True)
    
    
    start_display()

*  抛物线 parabola

from OCC.Core.GCE2d import GCE2d_MakeParabola
    from OCC.Core.gp import gp_Pnt, gp_Ax2d, gp_Pnt2d, gp_Dir2d
    from OCC.Display.SimpleGui import init_display
    
    
    focal=5
    parabola=GCE2d_MakeParabola(gp_Ax2d(gp_Pnt2d(0 , 0),gp_Dir2d(0,1)),focal,False)
    
    
    display, start_display, add_menu, add_function_to_menu = init_display()
    
    display.DisplayShape(parabola.Value(),update=True)
    
    
    start_display()

*  矩形（任意多边形就是改变Pi数量顺次连接）
 *  ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjc1NTM4NA_size_16_color_FFFFFF_t_70 7]

from OCC.Core.GeomAPI import GeomAPI_Interpolate
    from OCC.Core.TColgp import TColgp_HArray1OfPnt
    from OCC.Core.gp import gp_Pnt, gp_Ax2, gp_DX, gp_Circ, gp_Elips
    from OCC.Core.GC import GC_MakeSegment, GC_MakeCircle, GC_MakeArcOfCircle, GC_MakeEllipse
    from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire
    # 函数作用：在yz平面上通过一顶点及长宽绘制矩形
    # 输入：一顶点坐标，长值，宽值
    # 输出：暂定只输出矩形
    coor0=[0,3,3]#矩阵某一行
    Length=3
    Width=1
    yPlus = [0, Length, 0]
    zPlus = [0, 0, Width]
    coor1 = [coor0[i] + yPlus[i] for i in range(3)]
    coor2 = [coor0[i] + zPlus[i]+ yPlus[i] for i in range(3)]
    coor3 = [coor0[i] + zPlus[i] for i in range(3)]
    P0 = gp_Pnt(coor0[0],coor0[1],coor0[2])
    P1 = gp_Pnt(coor1[0],coor1[1],coor1[2])
    P2 = gp_Pnt(coor2[0],coor2[1],coor2[2])
    P3 = gp_Pnt(coor3[0],coor3[1],coor3[2])
    aSegment1 = GC_MakeSegment(P0, P1)
    anEdge1 = BRepBuilderAPI_MakeEdge(aSegment1.Value())
    aWire1 = BRepBuilderAPI_MakeWire(anEdge1.Edge())
    aSegment2 = GC_MakeSegment(P1, P2)
    anEdge2 = BRepBuilderAPI_MakeEdge(aSegment2.Value())
    aWire2 = BRepBuilderAPI_MakeWire(anEdge2.Edge())
    aSegment3 = GC_MakeSegment(P2, P3)
    anEdge3 = BRepBuilderAPI_MakeEdge(aSegment3.Value())
    aWire3 = BRepBuilderAPI_MakeWire(anEdge3.Edge())
    aSegment4 = GC_MakeSegment(P3, P0)
    anEdge4 = BRepBuilderAPI_MakeEdge(aSegment4.Value())
    aWire4 = BRepBuilderAPI_MakeWire(anEdge4.Edge())
    aRectangle = BRepBuilderAPI_MakeWire(aWire1 .Edge(),aWire2 .Edge(),aWire3 .Edge(),aWire4 .Edge())
    if __name__ == "__main__":
        from OCC.Display.SimpleGui import init_display
        display, start_display, add_menu, add_function_to_menu = init_display()
        display.DisplayShape(aRectangle.Shape(), update=True)
        start_display()

[www.yuntucad.com]: https://www.yuntucad.com
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