Python CGAL_Mesh_2示例

示例#1

文件： mesh_global.py 项目： crf1111/CGAL_Tutorial

from CGAL.CGAL_Kernel import Point_2
from CGAL.CGAL_Mesh_2 import Mesh_2_Constrained_Delaunay_triangulation_2
from CGAL.CGAL_Mesh_2 import Delaunay_mesh_size_criteria_2
from CGAL import CGAL_Mesh_2


cdt=Mesh_2_Constrained_Delaunay_triangulation_2()

va = cdt.insert(Point_2(-4,0))
vb = cdt.insert(Point_2(0,-1))
vc = cdt.insert(Point_2(4,0))
vd = cdt.insert(Point_2(0,1))
cdt.insert(Point_2(2, 0.6))

cdt.insert_constraint(va, vb)
cdt.insert_constraint(vb, vc)
cdt.insert_constraint(vc, vd)
cdt.insert_constraint(vd, va)

print "Number of vertices: ", cdt.number_of_vertices()

print "Meshing the triangulation..."

CGAL_Mesh_2.refine_Delaunay_mesh_2(cdt,Delaunay_mesh_size_criteria_2(0.125, 0.5))

print "Number of vertices: ", cdt.number_of_vertices()

示例#2

文件： conforming.py 项目： hd1001/cgal-bindings

vb = cdt.insert(Point_2(-5., 5.))
vc = cdt.insert(Point_2(4., 3.))
vd = cdt.insert(Point_2(5., -5.))
ve = cdt.insert(Point_2(6., 6.))
vf = cdt.insert(Point_2(-6., 6.))
vg = cdt.insert(Point_2(-6., -6.))
vh = cdt.insert(Point_2(6., -6.))

cdt.insert_constraint(va, vb)
cdt.insert_constraint(vb, vc)
cdt.insert_constraint(vc, vd)
cdt.insert_constraint(vd, va)
cdt.insert_constraint(ve, vf)
cdt.insert_constraint(vf, vg)
cdt.insert_constraint(vg, vh)
cdt.insert_constraint(vh, ve)

print("Number of vertices before: ", cdt.number_of_vertices())

#make it conforming Delaunay
CGAL_Mesh_2.make_conforming_Delaunay_2(cdt)

print("Number of vertices after make_conforming_Delaunay_2: ",
      cdt.number_of_vertices())

#then make it conforming Gabriel
CGAL_Mesh_2.make_conforming_Gabriel_2(cdt)

print("Number of vertices after make_conforming_Gabriel_2: ",
      cdt.number_of_vertices())

示例#3

文件： conforming.py 项目： Deepaknkumar/cgal-swig-bindings

#construct a constrained triangulation
va = cdt.insert(Point_2( 5., 5.))
vb = cdt.insert(Point_2(-5., 5.))
vc = cdt.insert(Point_2( 4., 3.))
vd = cdt.insert(Point_2( 5.,-5.))
ve = cdt.insert(Point_2( 6., 6.))
vf = cdt.insert(Point_2(-6., 6.))
vg = cdt.insert(Point_2(-6.,-6.))
vh = cdt.insert(Point_2( 6.,-6.))

cdt.insert_constraint(va,vb)
cdt.insert_constraint(vb,vc)
cdt.insert_constraint(vc,vd)
cdt.insert_constraint(vd,va)
cdt.insert_constraint(ve,vf)
cdt.insert_constraint(vf,vg)
cdt.insert_constraint(vg,vh)
cdt.insert_constraint(vh,ve)

print("Number of vertices before: ", cdt.number_of_vertices())

#make it conforming Delaunay
CGAL_Mesh_2.make_conforming_Delaunay_2(cdt)

print("Number of vertices after make_conforming_Delaunay_2: ", cdt.number_of_vertices())

#then make it conforming Gabriel
CGAL_Mesh_2.make_conforming_Gabriel_2(cdt)

print("Number of vertices after make_conforming_Gabriel_2: ", cdt.number_of_vertices())

示例#4

文件： mesh_global.py 项目： hd1001/cgal-bindings

from __future__ import print_function
from CGAL.CGAL_Kernel import Point_2
from CGAL.CGAL_Mesh_2 import Mesh_2_Constrained_Delaunay_triangulation_2
from CGAL.CGAL_Mesh_2 import Delaunay_mesh_size_criteria_2
from CGAL import CGAL_Mesh_2

cdt = Mesh_2_Constrained_Delaunay_triangulation_2()

va = cdt.insert(Point_2(-4, 0))
vb = cdt.insert(Point_2(0, -1))
vc = cdt.insert(Point_2(4, 0))
vd = cdt.insert(Point_2(0, 1))
cdt.insert(Point_2(2, 0.6))

cdt.insert_constraint(va, vb)
cdt.insert_constraint(vb, vc)
cdt.insert_constraint(vc, vd)
cdt.insert_constraint(vd, va)

print("Number of vertices: ", cdt.number_of_vertices())

print("Meshing the triangulation...")

CGAL_Mesh_2.refine_Delaunay_mesh_2(cdt,
                                   Delaunay_mesh_size_criteria_2(0.125, 0.5))

print("Number of vertices: ", cdt.number_of_vertices())

示例#5

文件： mesh_optimisation.py 项目： hd1001/cgal-bindings

from CGAL.CGAL_Mesh_2 import Delaunay_mesh_size_criteria_2
from CGAL.CGAL_Mesh_2 import Default_Delaunay_mesher_2
from CGAL.CGAL_Mesh_2 import Mesh_2_parameters
from CGAL import CGAL_Mesh_2

cdt = Mesh_2_Constrained_Delaunay_triangulation_2()
va = cdt.insert(Point_2(-2, 0))
vb = cdt.insert(Point_2(0, -2))
vc = cdt.insert(Point_2(2, 0))
vd = cdt.insert(Point_2(0, 1))
cdt.insert(Point_2(2, 0.6))

cdt.insert_constraint(va, vb)
cdt.insert_constraint(vb, vc)
cdt.insert_constraint(vc, vd)
cdt.insert_constraint(vd, va)

print("Number of vertices: ", cdt.number_of_vertices())
print("Meshing...")
mesher = Default_Delaunay_mesher_2(cdt)
mesher.set_criteria(Delaunay_mesh_size_criteria_2(0.125, 0.05))
mesher.refine_mesh()

print("Number of vertices: ", cdt.number_of_vertices())
print("Run Lloyd optimization...")
params = Mesh_2_parameters()
params.set_max_iteration_number(10)
CGAL_Mesh_2.lloyd_optimize_mesh_2(cdt, params)
print("done.")
print("Number of vertices: ", cdt.number_of_vertices())