smbinterp/interp/grid/DD.py

93 lines
2.1 KiB
Python

from interp.grid import grid as basegrid
from interp.tools import exact_func, log
import numpy as np
class grid(basegrid):
def __init__(self, verts, q):
basegrid.__init__(self, verts, q)
def for_qhull_generator(self):
"""
this returns a generator that should be fed into qdelaunay
"""
yield '2';
yield '%d' % len(self.verts)
for p in self.verts:
yield "%f %f" % (p[0], p[1])
def for_qhull(self):
"""
this returns a single string that should be fed into qdelaunay
"""
r = '2\n'
r += '%d\n' % len(self.verts)
for p in self.verts:
r += "%f %f\n" % (p[0], p[1])
return r
class rect_grid(grid):
def __init__(self, xres = 5, yres = 5):
xmin = -1.0
xmax = 1.0
xspan = xmax - xmin
xdel = xspan / float(xres - 1)
ymin = -1.0
ymay = 1.0
yspan = ymay - ymin
ydel = yspan / float(yres - 1)
verts = []
q = []
for x in xrange(xres):
cur_x = xmin + (x * xdel)
for y in xrange(yres):
cur_y = ymin + (y * ydel)
verts.append([cur_x, cur_y])
q.append(exact_func((cur_x, cur_y)))
grid.__init__(self, verts, q)
self.construct_connectivity()
class random_grid(rect_grid):
def __init__(self, num_verts = 10):
log.debug("number of verts: %d" % num_verts)
verts = []
q = []
r = np.random
appx_side_res = int(np.sqrt(num_verts))
log.debug("appx_side_res: %d" % appx_side_res)
delta = 1.0 / float(appx_side_res)
for x in xrange(appx_side_res + 1):
cur_x = x * delta
for cur_y in (0, 1):
new_point = [cur_x, cur_y]
verts.append(new_point)
q.append(exact_func(new_point))
for y in xrange(appx_side_res + 1):
cur_y = y * delta
for cur_x in (0, 1):
new_point = [cur_x, cur_y]
verts.append(new_point)
q.append(exact_func(new_point))
for i in xrange(num_verts):
cur_x = r.rand()
cur_y = r.rand()
verts.append([cur_x, cur_y])
q.append( exact_func( (cur_x, cur_y) ) )
grid.__init__(self, verts, q)
self.verts = np.array(self.verts)
self.q = np.array(self.q)