#mesh.uniform_refine(n=4)
fig = plt.figure()
axes = fig.gca()
mesh.add_plot(axes)
mesh.find_cell(axes, showindex=True)
plt.show()
c = np.array([0.5,0.5])
r = 0.5
maxit = 6
k=0
while k < maxit:
aopts = mesh.adaptive_options(method='numrefine', maxcoarsen=3, HB=True)
node = mesh.node
h = np.sqrt(mesh.cell_area())
print('NN', mesh.number_of_nodes())
d = np.sqrt((node[:,0]-c[0])**2+(node[:,1]-c[1])**2)
###要加密的点
flag0 = np.abs(d-r) < 0.1
##要粗化的点
flag1 = np.abs(d-r) > 0.1
### 找到点对应的单元都是需要标记的单元
node2cell = mesh.ds.node_to_cell()
idx0 = np.argwhere(node2cell[flag0,:]>0)
idx1 = np.argwhere(node2cell[flag1,:]>0)
NC = mesh.number_of_cells()
isrefineflag = np.zeros(NC, dtype=np.bool_)
isrefineflag[idx0[:,1]] = 1
def refine_quad(self, plot=True):
cell = np.array([[0, 1, 2, 3], [1, 4, 5, 2]], dtype=np.int)
node = np.array([[0, 0], [1, 0], [1, 1], [0, 1], [2, 0], [2, 1]],
dtype=np.float)
mesh = QuadrangleMesh(node, cell)
#mesh.uniform_refine()
mesh = HalfEdgeMesh.from_mesh(mesh)
c = np.array([0.8, 0.8])
r = 0.5
h = 1e-2
l = 6
k = 0
NB = 0
while k < l:
halfedge = mesh.ds.halfedge
halfedge1 = halfedge[:, 3]
node = mesh.node
flag = node - c
flag = flag[:, 0]**2 + flag[:, 1]**2
flag = flag <= r**2
flag1 = flag[halfedge[:, 0]].astype(int)
flag2 = flag[halfedge[halfedge1, 0]].astype(int)
markedge = flag1 + flag2 == 1
markedcell = halfedge[markedge, 1]
markedcell = np.unique(markedcell)
cell = np.unique(halfedge[:, 1])
nc = cell.shape[0]
markedcell1 = np.zeros(nc)
markedcell1[markedcell] = 1
print('makee', markedcell)
mesh.refine_quad(markedcell1)
k += 1
print('循环', k, '次***************************')
if plot:
fig = plt.figure()
axes = fig.gca()
nindex = mesh.nodedata['level']
mesh.add_plot(axes)
#mesh.add_halfedge_plot(axes, showindex=True)
#mesh.find_node(axes, showindex=True, multiindex=nindex)
plt.show()
if 0:
fig = plt.figure()
axes = fig.gca()
mesh.add_plot(axes)
mesh.find_node(axes, showindex=True)
mesh.find_cell(axes, showindex=True)
cindex, = np.nonzero(mesh.ds.cflag)
fig = plt.figure()
axes = fig.gca()
mesh.add_plot(axes)
mesh.find_node(axes, showindex=True)
mesh.find_cell(axes, showindex=True, multiindex=cindex)
NN = mesh.number_of_nodes()
nindex = np.zeros(NN, dtype=np.int)
halfedge = mesh.ds.halfedge
nindex = mesh.nodedata['level']
cindex = mesh.get_data('cell', 'level')
fig = plt.figure()
axes = fig.gca()
mesh.add_plot(axes)
mesh.find_node(axes, showindex=True, multiindex=nindex)
mesh.find_cell(axes, showindex=True, multiindex=cindex)
plt.show()
