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"""
@package vnet.vnet_utils
@brief Vector network analysis utilities.
Classes:
- vnet_core::VNETTmpVectMaps
- vnet_core::VectMap
- vnet_core::History
(C) 2013 by the GRASS Development Team
This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.
@author Stepan Turek <stepan.turek seznam.cz> (GSoC 2012, mentor: Martin Landa)
@author Lukas Bocan <silent_bob centrum.cz> (turn costs support)
@author Eliska Kyzlikova <eliska.kyzlikova gmail.com> (turn costs support)
"""
import math
from grass.script import core as grass
from grass.script.utils import encode
try:
import grass.lib.vector as vectlib
from ctypes import pointer, byref, c_char_p, c_int, c_double, POINTER
haveCtypes = True
except ImportError:
haveCtypes = False
def ParseMapStr(mapStr):
"""Create full map name (add current mapset if it is not present in name)"""
mapValSpl = mapStr.strip().split("@")
if len(mapValSpl) > 1:
mapSet = mapValSpl[1]
else:
mapSet = grass.gisenv()["MAPSET"]
mapName = mapValSpl[0]
return mapName, mapSet
def DegreesToRadians(degrees):
return degrees * math.pi / 180
def RadiansToDegrees(radians):
return radians * 180 / math.pi
def SnapToNode(e, n, tresh, vectMap):
"""Find nearest node to click coordinates (within given threshold)"""
if not haveCtypes:
return None
vectMap, mapSet = ParseMapStr(vectMap)
openedMap = pointer(vectlib.Map_info())
ret = vectlib.Vect_open_old(
openedMap, c_char_p(encode(vectMap)), c_char_p(encode(mapSet))
)
if ret == 1:
vectlib.Vect_close(openedMap)
if ret != 2:
return None
nodeNum = vectlib.Vect_find_node(
openedMap,
c_double(e),
c_double(n),
c_double(0),
c_double(tresh),
vectlib.WITHOUT_Z,
)
if nodeNum > 0:
e = c_double(0)
n = c_double(0)
vectlib.Vect_get_node_coor(openedMap, nodeNum, byref(e), byref(n), None) # z
e = e.value
n = n.value
else:
vectlib.Vect_close(openedMap)
return False
return e, n
def GetNearestNodeCat(e, n, layer, tresh, vectMap):
if not haveCtypes:
return -2
vectMapName, mapSet = ParseMapStr(vectMap)
openedMap = pointer(vectlib.Map_info())
ret = vectlib.Vect_open_old(
openedMap, c_char_p(encode(vectMapName)), c_char_p(encode(mapSet))
)
if ret == 1:
vectlib.Vect_close(openedMap)
if ret != 2:
return -1
nodeNum = vectlib.Vect_find_node(
openedMap,
c_double(e),
c_double(n),
c_double(0),
c_double(tresh),
vectlib.WITHOUT_Z,
)
if nodeNum > 0:
e = c_double(0)
n = c_double(0)
vectlib.Vect_get_node_coor(openedMap, nodeNum, byref(e), byref(n), None) # z
e = e.value
n = n.value
else:
vectlib.Vect_close(openedMap)
return -1
box = vectlib.bound_box()
List = POINTER(vectlib.boxlist)
List = vectlib.Vect_new_boxlist(c_int(0))
box.E = box.W = e
box.N = box.S = n
box.T = box.B = 0
vectlib.Vect_select_lines_by_box(openedMap, byref(box), vectlib.GV_POINT, List)
found = 0
dcost = 0
Cats = POINTER(vectlib.line_cats)
Cats = vectlib.Vect_new_cats_struct()
cat = c_int(0)
for j in range(List.contents.n_values):
line = List.contents.id[j]
type = vectlib.Vect_read_line(openedMap, None, Cats, line)
if type != vectlib.GV_POINT:
continue
if vectlib.Vect_cat_get(Cats, c_int(layer), byref(cat)):
found = 1
break
if found:
return cat.value
return -1
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