mirror of
https://git.salome-platform.org/gitpub/modules/geom.git
synced 2024-12-27 09:50:34 +05:00
80 lines
2.9 KiB
Python
80 lines
2.9 KiB
Python
# Creation of a PipeBiNormalAlongVector
|
|
import salome
|
|
salome.salome_init_without_session()
|
|
import GEOM
|
|
from salome.geom import geomBuilder
|
|
geompy = geomBuilder.New()
|
|
|
|
def MakeSpring(radius, height, rotation, direction, thread_radius, base_rotation, geom_builder):
|
|
|
|
def MakeHelix(radius, height, rotation, direction, geom_builder):
|
|
# - create a helix -
|
|
radius = 1.0 * radius
|
|
height = 1.0 * height
|
|
rotation = 1.0 * rotation
|
|
if direction > 0:
|
|
direction = +1
|
|
else:
|
|
direction = -1
|
|
pass
|
|
from math import sqrt
|
|
length_z = height
|
|
length_xy = radius*rotation
|
|
length = sqrt(length_z*length_z + length_xy*length_xy)
|
|
nb_steps = 1
|
|
epsilon = 1.0e-6
|
|
while 1:
|
|
z_step = height / nb_steps
|
|
angle_step = rotation / nb_steps
|
|
z = 0.0
|
|
angle = 0.0
|
|
helix_points = []
|
|
for n in range(nb_steps+1):
|
|
from math import cos, sin
|
|
x = radius * cos(angle)
|
|
y = radius * sin(angle)
|
|
p = geom_builder.MakeVertex(x, y, z)
|
|
helix_points.append( p )
|
|
z += z_step
|
|
angle += direction * angle_step
|
|
pass
|
|
helix = geom_builder.MakeInterpol(helix_points)
|
|
length_test = geom_builder.BasicProperties(helix)[0]
|
|
prec = abs(length-length_test)/length
|
|
# print nb_steps, length_test, prec
|
|
if prec < epsilon:
|
|
break
|
|
nb_steps *= 2
|
|
pass
|
|
return helix
|
|
|
|
# - create a pipe -
|
|
thread_radius = 1.0 * thread_radius
|
|
# create a helix
|
|
helix = MakeHelix(radius, height, rotation, direction, geom_builder=geom_builder)
|
|
# base in the (Ox, Oz) plane
|
|
p0 = geom_builder.MakeVertex(radius-3*thread_radius, 0.0, -thread_radius)
|
|
p1 = geom_builder.MakeVertex(radius+3*thread_radius, 0.0, -thread_radius)
|
|
p2 = geom_builder.MakeVertex(radius+3*thread_radius, 0.0, +thread_radius)
|
|
p3 = geom_builder.MakeVertex(radius-3*thread_radius, 0.0, +thread_radius)
|
|
e0 = geom_builder.MakeEdge(p0, p1)
|
|
e1 = geom_builder.MakeEdge(p1, p2)
|
|
e2 = geom_builder.MakeEdge(p2, p3)
|
|
e3 = geom_builder.MakeEdge(p3, p0)
|
|
w = geom_builder.MakeWire([e0, e1, e2, e3])
|
|
# create a base face
|
|
base = geom_builder.MakeFace(w, True)
|
|
# create a binormal vector
|
|
binormal = geom_builder.MakeVectorDXDYDZ(0.0, 0.0, 10.0)
|
|
# create a pipe
|
|
spring = geom_builder.MakePipeBiNormalAlongVector(base, helix, binormal)
|
|
# Publish in the study
|
|
geom_builder.addToStudy(base, "base")
|
|
geom_builder.addToStudy(helix, "helix")
|
|
geom_builder.addToStudy(binormal, "binormal")
|
|
geom_builder.addToStudy(spring, "spring")
|
|
return spring
|
|
|
|
from math import pi
|
|
spring = MakeSpring(50, 100, 2*pi, 1, 5, pi/2, geom_builder=geompy)
|