1.点 到 线, 直线,曲线,等上的投影

@staticmethod  # 点到Lin的投影
def Project_Pnt_To_Lin(p: gp_Pnt, lin: gp_Lin):
    Edge = BRepBuilderAPI_MakeEdge(lin).Edge()
    curve = BRep_Tool.Curve(Edge)
    proPnt = GeomAPI_ProjectPointOnCurve(p, curve[0])
    NearestPoint = proPnt.NearestPoint()
    return NearestPoint

2.点 到面上的投影

@staticmethod  # 点到Pln的投影
def project_point_on_plane(plane, point):
    pl = plane.Pln()
    aa, bb = projlib_Project(pl, point).Coord()
    point = plane.Value(aa, bb)
    return point

3.参考：http://www.cppblog.com/eryar/archive/2016/08/16/214182.html

BRepProj_Projection

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire, BRepBuilderAPI_Transform
from OCC.Core.BRepOffsetAPI import BRepOffsetAPI_ThruSections
from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeSphere
from OCC.Core.BRepProj import BRepProj_Projection
from OCC.Core.GC import GC_MakeArcOfCircle, GC_MakeSegment
from OCC.Core.TopoDS import topods
from OCC.Core.gp import gp_Pnt, gp_Trsf, gp_Dir,gp_OX
from OCC.Display.SimpleGui import init_display

display, start_display, add_menu, add_function_to_menu = init_display()
sphere = BRepPrimAPI_MakeSphere(50).Shape()


height = 70
width = 50
thickness = 30

print("creating bottle")
# The points we'll use to create the profile of the bottle's body
aPnt1 = gp_Pnt(-width / 2.0, 0, 0)
aPnt2 = gp_Pnt(-width / 2.0, -thickness / 4.0, 0)
aPnt3 = gp_Pnt(0, -thickness / 2.0, 0)
aPnt4 = gp_Pnt(width / 2.0, -thickness / 4.0, 0)
aPnt5 = gp_Pnt(width / 2.0, 0, 0)

aArcOfCircle = GC_MakeArcOfCircle(aPnt2, aPnt3, aPnt4)
aSegment1 = GC_MakeSegment(aPnt1, aPnt2)
aSegment2 = GC_MakeSegment(aPnt4, aPnt5)

# Could also construct the line edges directly using the points instead of the resulting line
aEdge1 = BRepBuilderAPI_MakeEdge(aSegment1.Value())
aEdge2 = BRepBuilderAPI_MakeEdge(aArcOfCircle.Value())
aEdge3 = BRepBuilderAPI_MakeEdge(aSegment2.Value())

# Create a wire out of the edges
aWire = BRepBuilderAPI_MakeWire(aEdge1.Edge(), aEdge2.Edge(), aEdge3.Edge())

# Quick way to specify the X axis
xAxis = gp_OX()

# Set up the mirror
aTrsf = gp_Trsf()
aTrsf.SetMirror(xAxis)

# Apply the mirror transformation
aBRespTrsf = BRepBuilderAPI_Transform(aWire.Wire(), aTrsf)

# Get the mirrored shape back out of the transformation and convert back to a wire
aMirroredShape = aBRespTrsf.Shape()

# A wire instead of a generic shape now
aMirroredWire = topods.Wire(aMirroredShape)

# Combine the two constituent wires
mkWire = BRepBuilderAPI_MakeWire()
mkWire.Add(aWire.Wire())
mkWire.Add(aMirroredWire)
myWireProfile = mkWire.Wire()
display.DisplayShape(myWireProfile, color='yellow', transparency=0.9, update=True)

res = BRepProj_Projection(myWireProfile, Box1, gp_Dir(0, 0, 1)) # api
wire1 = res.Current()
res.Next()
wire2 = res.Current()

generator = BRepOffsetAPI_ThruSections(True)
generator.AddWire(myWireProfile)
generator.AddWire(wire2)
generator.Build()
display.DisplayShape(generator.Shape(), color='black', transparency=0.9, update=True)
display.DisplayShape(sphere, color='black', transparency=0.9, update=True)
# display.DisplayShape(res.Current(), color='black', transparency=0.9, update=True)
start_display()