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csg2d - fix tutorial

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This commit is contained in:
Matthias Hochsteger 2020-09-15 15:48:49 +02:00
parent 10a9decfd2
commit 2763285b46
2 changed files with 49 additions and 39 deletions
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31
libsrc/geom2d/csg2d.cpp
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@ -345,12 +345,35 @@ bool IsOverlapping( Spline p, Spline s, double & alpha, double & beta, Intersect
// Check if s.p0 lies on p and vice versa, also check if tangents are in same direction (TODO: TEST) // Check if s.p0 lies on p and vice versa, also check if tangents are in same direction (TODO: TEST)
// If so, assume overlapping splines // If so, assume overlapping splines
// TODO: Better checks! False positives could happen here! // TODO: Better checks! False positives could happen here!
IntersectSplineSegment1( p, s.StartPI(), p_mid, lam0, alpha, true ); if(Dist(s.StartPI(), p.StartPI())<EPSILON)
IntersectSplineSegment1( s, p.StartPI(), s_mid, lam1, beta, true ); {
lam0 = 0.0;
alpha = 0.0;
}
else if(Dist(s.StartPI(), p.EndPI())<EPSILON)
{
lam0 = 0.0;
alpha = 1.0;
}
else
IntersectSplineSegment1( p, s.StartPI(), p_mid, lam0, alpha, true );
if(Dist(p.StartPI(), s.StartPI())<EPSILON)
{
lam1 = 0.0;
beta = 0.0;
}
else if(Dist(p.StartPI(), s.EndPI())<EPSILON)
{
lam1 = 0.0;
beta = 1.0;
}
else
IntersectSplineSegment1( s, p.StartPI(), s_mid, lam1, beta, true );
// Also check if midpoints lie on other spline // Also check if midpoints lie on other spline
IntersectSplineSegment1( p, s.GetPoint(0.5), p_mid, lam2, alpha_mid, true ); IntersectSplineSegment1( p, s.GetPoint(0.4), p_mid, lam2, alpha_mid, true );
IntersectSplineSegment1( s, p.GetPoint(0.5), s_mid, lam3, beta_mid, true ); IntersectSplineSegment1( s, p.GetPoint(0.4), s_mid, lam3, beta_mid, true );
auto tang0 = s.GetTangent(0.); auto tang0 = s.GetTangent(0.);
auto tang1 = p.GetTangent(alpha); auto tang1 = p.GetTangent(alpha);

57
py_tutorials/csg2d.py
View File

@ -1,7 +1,5 @@
from ngsolve import *
from random import random, seed from random import random, seed
ngsglobals.msg_level = 0 from ngsolve import Draw, Mesh
import netgen import netgen
from pyngcore import * from pyngcore import *
@ -9,42 +7,31 @@ from netgen.geom2d import *
seed(4) seed(4)
def GenerateMesh(): g = CSG2d()
outer = Rectangle((0, 0), (1, 1), "outer","outer")
inner = Solid2d()
g = CSG2d() for i in range(30):
g1 = CSG2d() cx = random()
outer = Rectangle(0, 1, 0, 1,"outer","outer") cy = random()
inner = Solid2d() r = 0.03+0.05*random()
print("Add Circle", i, cx, cy, r, flush = True)
for i in range(30): circle = Circle((cx, cy), r, "circle"+str(i), "circle"+str(i))
cx = random() inner += circle
cy = random() outer -= circle
r = 0.03+0.05*random()
print("Add Circle", i, cx, cy, r, flush = True)
circle = Circle(cx, cy, r, "circle"+str(i), "circle"+str(i))
g1.Add(circle)
inner += circle
outer -= circle
g.Add(inner) g.Add(inner)
g.Add(outer) g.Add(outer)
geo = g.GenerateSplineGeometry() geo = g.GenerateSplineGeometry()
m = geo.GenerateMesh(maxh=0.1)
try:
from ngsolve import Draw, Mesh
Draw(geo) Draw(geo)
# draw this geometry for checking ff the final mesh/geometry is correct
# g1.Add(outer)
# geo1 = g1.GenerateSplineGeometry()
# Draw(geo1)
print('generate mesh')
m = geo.GenerateMesh(maxh=0.1)
mesh = Mesh(m) mesh = Mesh(m)
mesh.Curve(3) mesh.Curve(3)
Draw(mesh) Draw(mesh)
except:
return mesh pass
from ngsolve import Draw
with PajeTrace():
mesh = GenerateMesh()