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mmqgis_library.py
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mmqgis_library.py
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# --------------------------------------------------------
# mmqgis_library - mmqgis operation functions
#
# begin : 10 May 2010
# copyright : (c) 2010 by Michael Minn
# email : See michaelminn.com
#
# MMQGIS is free software and is offered without guarantee
# or warranty. You can redistribute it and/or modify it
# under the terms of version 2 of the GNU General Public
# License (GPL v2) as published by the Free Software
# Foundation (www.gnu.org).
# --------------------------------------------------------
import io
import re
import csv
import sys
import time
import locale
import random
import urllib2
import os.path
import operator
import tempfile
import xml.etree.ElementTree
from qgis.core import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *
# Used instead of "import math" so math functions can be used without "math." prefix
from math import *
# --------------------------------------------------------
# MMQGIS Utility Functions
# --------------------------------------------------------
# Needed to replace the useful function QgsVectorLayer::featureAtId()
# that was tantalizingly added in 1.9 but then removed
def mmqgis_feature_at_id(layer, featureid):
iterator = layer.getFeatures(QgsFeatureRequest(featureid))
feature = QgsFeature()
if iterator.nextFeature(feature):
return feature
return None
def mmqgis_find_layer(layer_name):
# print "find_layer(" + str(layer_name) + ")"
#for name, search_layer in QgsMapLayerRegistry.instance().mapLayers().iteritems():
# if search_layer.name() == layer_name:
# return search_layer
if not layer_name:
return None
layers = QgsMapLayerRegistry.instance().mapLayersByName(layer_name)
if (len(layers) >= 1):
return layers[0]
return None
def mmqgis_is_float(s):
try:
float(s)
return True
except:
return False
# Cumbersome function to give backward compatibility before python 2.7
def mmqgis_format_float(value, separator, decimals):
formatstring = ("%0." + unicode(int(decimals)) + "f")
# print str(value) + ": " + formatstring
string = formatstring % value
intend = string.find('.')
if intend < 0:
intend = len(string)
if separator and (intend > 3):
start = intend % 3
if start == 0:
start = 3
intstring = string[0:start]
for x in range(start, intend, 3):
intstring = intstring + separator + string[x:x+3]
string = intstring + string[intend:]
return string
def mmqgis_gridify_points(hspacing, vspacing, points):
# Align points to grid
point_count = 0
deleted_points = 0
newpoints = []
for point in points:
point_count += 1
newpoints.append(QgsPoint(round(point.x() / hspacing, 0) * hspacing, \
round(point.y() / vspacing, 0) * vspacing))
# Delete overlapping points
z = 0
while z < (len(newpoints) - 2):
if newpoints[z] == newpoints[z + 1]:
newpoints.pop(z + 1)
deleted_points += 1
else:
z += 1
# Delete line points that go out and return to the same place
z = 0
while z < (len(newpoints) - 3):
if newpoints[z] == newpoints[z + 2]:
newpoints.pop(z + 1)
newpoints.pop(z + 1)
deleted_points += 2
# Step back to catch arcs
if (z > 0):
z -= 1
else:
z += 1
# Delete overlapping start/end points
while (len(newpoints) > 1) and (newpoints[0] == newpoints[len(newpoints) - 1]):
newpoints.pop(len(newpoints) - 1)
deleted_points += 2
return newpoints, point_count, deleted_points
# http://stackoverflow.com/questions/3410976/how-to-round-a-number-to-significant-figures-in-python
def mmqgis_round(number, digits):
if (number == 0):
return 0
else:
return round(number, digits - int(floor(log10(abs(number)))) - 1)
# Use common address abbreviations to reduce naming discrepancies and improve hit ratio
def mmqgis_searchable_streetname(name):
# print "searchable_name(" + str(name) + ")"
if not name:
return ""
# name = unicode(name).strip().lower()
name = name.strip().lower()
name = name.replace(".", "")
name = name.replace(" street", " st")
name = name.replace(" avenue", " av")
name = name.replace(" plaza", " plz")
name = name.replace(" drive", " dr")
name = name.replace("saint ", "st ")
name = name.replace("fort ", "ft ")
name = name.replace(" ave", " av")
name = name.replace("east", "e")
name = name.replace("west", "w")
name = name.replace("north", "n")
name = name.replace("south", "s")
name = name.replace("1st", "1")
name = name.replace("2nd", "2")
name = name.replace("3rd", "3")
name = name.replace("4th", "4")
name = name.replace("5th", "5")
name = name.replace("6th", "6")
name = name.replace("7th", "7")
name = name.replace("8th", "8")
name = name.replace("9th", "9")
name = name.replace("0th", "0")
name = name.replace("1th", "1")
name = name.replace("2th", "2")
name = name.replace("3th", "3")
return name
# Parses and normalizes street addresses to make search easier.
# Returns list: [number street unit]
def mmqgis_normalize_address(address):
if not address:
return [None, None, None]
# Everything upper case
address = address.strip()
address = address.upper()
# Remove confusing punctuation
address = address.replace(".", "")
address = address.replace(",", "")
# address = address.replace("#", "")
parts = address.split()
if (len(parts) <= 1):
return [None, address, None]
# Find Unit Number (if any)
unit = None
if (len(parts) >= 3) and (parts[len(parts) - 2] == "SUITE"):
unit = parts[len(parts) - 1]
del parts[(len(parts) - 2):len(parts)]
elif (len(parts) >= 3) and (parts[len(parts) - 2] == "UNIT"):
unit = parts[len(parts) - 1]
del parts[(len(parts) - 2):len(parts)]
elif (len(parts) >= 3) and (parts[len(parts) - 2] == "STE"):
unit = parts[len(parts) - 1]
del parts[(len(parts) - 2):len(parts)]
elif (len(parts) >= 3) and (parts[len(parts) - 2] == "FLOOR"):
unit = "FLOOR " + unicode(parts[len(parts) - 1])
del parts[(len(parts) - 2):len(parts)]
elif (len(parts) > 1) and (parts[len(parts) - 1][0] == "#"):
unit = parts[len(parts) - 1].replace('#','')
del parts[len(parts) - 1]
# Find Lot Number (if any)
number = None
if (len(parts) >= 3) and (not parts[0][0].isdigit()) and \
(parts[len(parts) - 2][0].isdigit()) and (parts[len(parts) - 1][0].isdigit()):
# European street number + unit number last
number = parts[len(parts) - 2]
del parts[len(parts) - 2]
elif (not parts[0][0].isdigit() and (parts[len(parts) - 1][0].isdigit())):
# European street number last
number = parts[len(parts) - 1]
del parts[len(parts) - 1]
elif parts[0][0].isdigit():
# American street number first
number = parts[0]
del parts[0]
# Replace numeric suffixes
suffixes = {
"1ST": "1",
"2ND": "2",
"3RD": "3",
"4TH": "4",
"5TH": "5",
"6TH": "6",
"7TH": "7",
"8TH": "8",
"9TH": "9",
"0TH": "0",
"1TH": "1",
"2TH": "2",
"3TH": "3" }
# Regular expressions are much faster than loop
# https://www.safaribooksonline.com/library/view/python-cookbook-2nd/0596007973/ch01s19.html
regex = re.compile("(%s)" % "|".join(suffixes.keys()))
for index, part in enumerate(parts):
parts[index] = regex.sub(lambda x: suffixes[x.group(0)], part)
#for suffix in suffixes:
# for index, part in enumerate(parts):
# parts[index] = part.replace(suffix[0], suffix[1])
# Text versions of numbered streets
number_words = {
"FIRST": "1",
"SECOND": "2",
"THIRD": "3",
"FOURTH": "4",
"FIFTH": "5",
"SIXTH": "6",
"SEVENTH": "7",
"EIGHTH": "8",
"NINTH": "9",
"TENTH": "10",
"ELEVENTH": "11",
"TWELFTH": "12",
"THIRTEENTH": "13",
"FOURTEENTH": "14",
"FIFTEENTH": "15",
"SIXTEENTH": "16",
"SEVENTEENTH": "17",
"EIGHTEENTH": "18",
"NINTEENTH": "19",
"TWENTIETH": "20" }
parts = map(lambda x: number_words.get(x, x), parts)
# Full strings replaced with abbreviations because
# replacing abbreviations with full strings would involve uncertain inference
# while replacing full strings with abbreviations increases
# potential matches at the expense of accuracy
abbreviations = {
"STREET": "ST",
"BOULEVARD": "BLVD",
"PARKWAY": "PKWY",
"HIGHWAY": "HWY",
"CIRCLE": "CIR",
"AVENUE": "AV",
"PLACE": "PL",
"PLAZA": "PL",
"DRIVE": "DR",
"SAINT": "ST",
"NORTH": "N",
"SOUTH": "S",
"FORT": "FT",
"ROAD": "RD",
"EAST": "E",
"WEST": "W",
"AVE": "AV"}
# map() is faster than loop
parts = map(lambda x: abbreviations.get(x, x), parts)
#for abbreviation in abbreviations:
# for index, part in enumerate(parts):
# if (part == abbreviation[0]):
# parts[index] = abbreviation[1]
# Recombine into street name
street = ' '.join(parts)
return [number, street, unit]
def mmqgis_geocode_address_google(address, apikey):
if apikey:
url = "https://maps.googleapis.com/maps/api/geocode/xml?sensor=false&address=" + address + "&key=" + apikey
else:
url = "http://maps.googleapis.com/maps/api/geocode/xml?sensor=false&address=" + address
max_attempts = 5
for attempt in range(1, max_attempts + 1):
try:
xml = urllib2.urlopen(url).read()
break
except Exception, e:
message = "Failure connecting to maps.googleapis.com: " + unicode(e)
if (attempt >= max_attempts):
return message, None, None, None, None
# Wait a second and try again
time.sleep(1)
if (xml.find('OVER_QUERY_LIMIT') > 0):
return "Exceeded Daily Google Limit", None, None, None, None
if (xml.find('The provided API key is invalid.') > 0):
return "Invalid API Key", None, None, None, None
if (xml.find('REQUEST_DENIED') > 0):
return "Request Denied", None, None, None, None
#print(url)
resultstart = 0
x = []
y = []
addrtype = []
addrlocat = []
formatted_addr = []
resultstart = xml.find("<result>")
while (resultstart > 0):
resultend = xml.find("</result>", resultstart)
if (resultend < 0):
resultend = len(xml)
result = xml[resultstart:resultend]
resultstart = xml.find("<result>", resultend)
latstart = result.find("<lat>")
latend = result.find("</lat>")
if (latstart < 0) or (latend < (latstart + 5)):
continue
longstart = result.find("<lng>")
longend = result.find("</lng>")
if (longstart < 0) and (longend < (longstart + 5)):
continue
y.append(float(result[latstart + 5:latend]))
x.append(float(result[longstart + 5:longend]))
addrtypestart = result.find("<type>")
addrtypeend = result.find("</type>")
if (addrtypestart > 0) and (addrtypeend > (addrtypestart + 6)):
addrtype.append(unicode(result[(addrtypestart + 6):addrtypeend], 'utf-8').strip())
else:
addrtype.append("")
addrlocatstart = result.find("<location_type>")
addrlocatend = result.find("</location_type>")
if (addrlocatstart > 0) and (addrlocatend > (addrlocatstart + 15)):
addrlocat.append(unicode(result[(addrlocatstart + 15):addrlocatend], 'utf-8').strip())
else:
addrlocat.append("")
formstart = result.find("<formatted_address>")
formend = result.find("</formatted_address>")
if (formstart > 0) and (formend > (formstart + 19)):
formatted_addr.append(unicode(result[(formstart + 19):formend], 'utf-8').strip())
else:
formatted_addr.append(address)
return x, y, addrtype, addrlocat, formatted_addr
def mmqgis_geocode_address_osm(address):
url = "http://nominatim.openstreetmap.org/search?format=xml&q=" + address
max_attempts = 5
for attempt in range(1, max_attempts + 1):
try:
osm = urllib2.urlopen(url).read()
break
except Exception, e:
message = "Failure connecting to maps.googleapis.com: " + unicode(e)
if (attempt >= max_attempts):
return message, None, None, None, None
# Wait a second and try again
time.sleep(1)
# print(url)
# print(osm)
x = []
y = []
addrtype = []
addrlocat = []
formatted_addr = []
# Parse the XML
try:
results = xml.etree.ElementTree.fromstring(osm)
# results = tree.getroot()
except:
# print("XML Parser Failure")
return None, None, None, None, None
# Parse <place> under <searchresults>
for place in results:
try:
lat = place.attrib['lat']
lon = place.attrib['lon']
except:
lat = None
lon = None
try:
aclass = place.attrib['class']
except:
aclass = ""
try:
atype = place.attrib['type']
except:
atype = ""
try:
aname = place.attrib['display_name']
except:
aname = ""
# print(lat, lon)
if (lat != None) and (lon != None):
x.append(float(lon))
y.append(float(lat))
addrtype.append(aclass)
addrlocat.append(atype)
formatted_addr.append(aname)
return x, y, addrtype, addrlocat, formatted_addr
# Legacy code left here for reference if anything breaks in new XML parsing 1/31/2016
def mmqgis_old_geocode_address_osm(address):
url = "http://nominatim.openstreetmap.org/search?format=xml&q=" + address
try:
xml = urllib2.urlopen(url).read()
except:
# URLError as e: e.reason
return "Failure connecting to nominatim.openstreetmap.org", None, None, None, None
#print(url)
#print(xml)
x = []
y = []
addrtype = []
addrlocat = []
formatted_addr = []
placestart = xml.find("<place")
while (placestart > 0):
placeend = xml.find("/>", placestart)
if (placeend < 0):
placeend = len(xml)
place = xml[placestart:placeend]
placestart = xml.find("<place", placeend)
latstart = place.find('lat="')
latend = place.find('"', latstart + 5)
if (latstart < 0) or (latend < (latstart + 5)):
continue
longstart = place.find('lon="')
longend = place.find('"', longstart + 5)
if (latstart < 0) or (latend < (latstart + 5)):
continue
y.append(float(place[latstart + 5:latend]))
x.append(float(place[longstart + 5:longend]))
addrtypestart = place.find("class=")
addrtypeend = place.find("'", addrtypestart + 7)
if (addrtypestart > 0) and (addrtypeend > (addrtypestart + 7)):
addrtype.append(unicode(place[(addrtypestart + 7):addrtypeend], 'utf-8').strip())
else:
addrtype.append("")
addrlocatstart = place.find("type=")
addrlocatend = place.find("'", addrlocatstart + 6)
if (addrlocatstart > 0) and (addrlocatend > (addrlocatstart + 6)):
addrlocat.append(unicode(place[(addrlocatstart + 6):addrlocatend], 'utf-8').strip())
else:
addrlocat.append("")
formstart = place.find("display_name=")
formend = place.find("'", formstart + 14)
if (formstart > 0) and (formend > (formstart + 14)):
formatted_addr.append(unicode(place[(formstart + 14):formend], 'utf-8').strip())
else:
formatted_addr.append(address)
return x, y, addrtype, addrlocat, formatted_addr
def mmqgis_wkbtype_to_text(wkbtype):
if wkbtype == QGis.WKBUnknown: return "Unknown"
if wkbtype == QGis.WKBPoint: return "point"
if wkbtype == QGis.WKBLineString: return "linestring"
if wkbtype == QGis.WKBPolygon: return "polygon"
if wkbtype == QGis.WKBMultiPoint: return "multipoint"
if wkbtype == QGis.WKBMultiLineString: return "multilinestring"
if wkbtype == QGis.WKBMultiPolygon: return "multipolygon"
if wkbtype == QGis.WKBPoint25D: return "point 2.5d"
if wkbtype == QGis.WKBLineString25D: return "linestring 2.5D"
if wkbtype == QGis.WKBPolygon25D: return "polygon 2.5D"
if wkbtype == QGis.WKBMultiPoint25D: return "multipoint 2.5D"
if wkbtype == QGis.WKBMultiLineString25D: return "multilinestring 2.5D"
if wkbtype == QGis.WKBMultiPolygon25D: return "multipolygon 2.5D"
return "Unknown WKB " + unicode(wkbtype)
def mmqgis_status_message(qgis, message):
qgis.mainWindow().statusBar().showMessage(message)
def mmqgis_completion_message(qgis, message):
mmqgis_status_message(qgis, message)
qgis.messageBar().pushMessage(message, 0, 3)
def mmqgis_distance(start, end):
# Assumes points are WGS 84 lat/long
# Returns great circle distance in meters
radius = 6378137 # meters
flattening = 1/298.257223563
# Convert to radians with reduced latitudes to compensate
# for flattening of the earth as in Lambert's formula
start_lon = start.x() * pi / 180
start_lat = atan2((1 - flattening) * sin(start.y() * pi / 180), cos(start.y() * pi / 180))
end_lon = end.x() * pi / 180
end_lat = atan2((1 - flattening) * sin(end.y() * pi / 180), cos(end.y() * pi / 180))
# Haversine formula
arc_distance = (sin((end_lat - start_lat) / 2) ** 2) + \
(cos(start_lat) * cos(end_lat) * (sin((end_lon - start_lon) / 2) ** 2))
return 2 * radius * atan2(sqrt(arc_distance), sqrt(1 - arc_distance))
def mmqgis_bearing(start, end):
# Assumes points are WGS 84 lat/long
# http://www.movable-type.co.uk/scripts/latlong.html
start_lon = start.x() * pi / 180
start_lat = start.y() * pi / 180
end_lon = end.x() * pi / 180
end_lat = end.y() * pi / 180
return atan2(sin(end_lon - start_lon) * cos(end_lat), \
(cos(start_lat) * sin(end_lat)) - \
(sin(start_lat) * cos(end_lat) * cos(end_lon - start_lon))) \
* 180 / pi
def mmqgis_endpoint(start, distance, degrees):
# Assumes points are WGS 84 lat/long, distance in meters,
# bearing in degrees with north = 0, east = 90, west = -90
# Uses the haversine formula for calculation:
# http://www.movable-type.co.uk/scripts/latlong.html
radius = 6378137.0 # meters
start_lon = start.x() * pi / 180
start_lat = start.y() * pi / 180
bearing = degrees * pi / 180
end_lat = asin((sin(start_lat) * cos(distance / radius)) +
(cos(start_lat) * sin(distance / radius) * cos(bearing)))
end_lon = start_lon + atan2( \
sin(bearing) * sin(distance / radius) * cos(start_lat),
cos(distance / radius) - (sin(start_lat) * sin(end_lat)))
return QgsPoint(end_lon * 180 / pi, end_lat * 180 / pi)
def mmqgis_feet_to_meters(feet):
return feet / 3.2808399
def mmqgis_meters_to_feet(meters):
return meters * 3.2808399
def mmqgis_miles_to_meters(miles):
return miles * 1609.344
def mmqgis_meters_to_miles(meters):
return meters / 1609.344
#chm = QgsPoint(-88.241161, 40.115742)
#dav = QgsPoint(-88.226386,40.1072)
#chi = QgsPoint(-87.640368,41.877438)
#jan = QgsPoint(-90.191065, 32.301516)
#ufl = QgsPoint(-88.209445, 40.111328)
def mmqgis_buffer_geometry(geometry, meters):
if meters <= 0:
return None
# To approximate meaningful meter distances independent of the original CRS,
# the geometry is transformed to an azimuthal equidistant projection
# with the center of the polygon as the origin. After buffer creation,
# the buffer is transformed to WGS 84 and returned. While this may introduce
# some deviation from the original CRS, buffering is assumed in practice
# to be a fairly inexact operation that can tolerate such deviation
wgs84 = QgsCoordinateReferenceSystem()
wgs84.createFromProj4("+proj=longlat +datum=WGS84 +no_defs")
latitude = str(geometry.centroid().asPoint().y())
longitude = str(geometry.centroid().asPoint().x())
#proj4 = "+proj=aeqd +lat_0=" + str(geometry.centroid().asPoint().y()) + \
# " +lon_0=" + str(geometry.centroid().asPoint().x()) + \
# " +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs"
# For some reason, Azimuthal Equidistant transformation noticed to not be
# working on 10 July 2014. World Equidistant Conic works, but there may be errors.
proj4 = "+proj=eqdc +lat_0=0 +lon_0=0 +lat_1=60 +lat_2=60 " + \
"+x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
azimuthal_equidistant = QgsCoordinateReferenceSystem()
azimuthal_equidistant.createFromProj4(proj4)
transform = QgsCoordinateTransform(wgs84, azimuthal_equidistant)
geometry.transform(transform)
newgeometry = geometry.buffer(meters, 7)
wgs84 = QgsCoordinateReferenceSystem()
wgs84.createFromProj4("+proj=longlat +datum=WGS84 +no_defs")
transform = QgsCoordinateTransform(azimuthal_equidistant, wgs84)
newgeometry.transform(transform)
return newgeometry
def mmqgis_buffer_point(point, meters, edges, rotation_degrees):
if (meters <= 0) or (edges < 3):
return None
# Points are treated separately from other geometries so that discrete
# edges can be supplied for non-circular buffers that are not supported
# by the QgsGeometry.buffer() function
wgs84 = QgsCoordinateReferenceSystem()
wgs84.createFromProj4("+proj=longlat +datum=WGS84 +no_defs")
# print "Point " + unicode(point.x()) + ", " + unicode(point.y()) + " meters " + unicode(meters)
polyline = []
for edge in range(0, edges + 1):
degrees = ((float(edge) * 360.0 / float(edges)) + rotation_degrees) % 360
polyline.append(mmqgis_endpoint(point, meters, degrees))
return QgsGeometry.fromPolygon([polyline])
def mmqgis_buffer_line_side(geometry, width, direction):
# width in meters
# direction should be 0 for north side, 90 for east, 180 for south, 270 for west
# print "\nmmqgis_buffer_line_side(" + unicode(direction) + ")"
if (geometry.wkbType() == QGis.WKBMultiLineString) or \
(geometry.wkbType() == QGis.WKBMultiLineString25D):
multipolygon = None
for line in geometry.asMultiPolyline():
segment = mmqgis_buffer_line_side(QgsGeometry.fromPolyline(line), width, direction)
if multipolygon == None:
multipolygon = segment
else:
multipolygon = multipolygon.combine(segment)
# print " Build multipolygon " + str(multipolygon.isGeosValid())
# Multiline always has multipolygon buffer even if buffers merge into one polygon
if multipolygon.wkbType() == QGis.WKBPolygon:
multipolygon = QgsGeometry.fromMultiPolygon([multipolygon.asPolygon()])
# print "Final Multipolygon " + str(multipolygon.isGeosValid())
return multipolygon
if (geometry.wkbType() != QGis.WKBLineString) and \
(geometry.wkbType() != QGis.WKBLineString25D):
return geometry
points = geometry.asPolyline()
line_bearing = mmqgis_bearing(points[0], points[-1]) % 360
# Determine side of line to buffer based on angle from start point to end point
# "bearing" will be 90 for right side buffer, -90 for left side buffer
direction = round((direction % 360) / 90) * 90
if (direction == 0): # North
if (line_bearing >= 180):
bearing = 90 # Right
else:
bearing = -90 # Left
elif (direction == 90): # East
if (line_bearing >= 270) or (line_bearing < 90):
bearing = 90 # Right
else:
bearing = -90 # Left
elif (direction == 180): # South
if (line_bearing < 180):
bearing = 90 # Right
else:
bearing = -90 # Left
else: # West
if (line_bearing >= 90) and (line_bearing < 270):
bearing = 90 # Right
else:
bearing = -90 # Left
# Buffer individual segments
polygon = None
for z in range(0, len(points) - 1):
b1 = mmqgis_bearing(points[z], points[z + 1]) % 360
# Form rectangle beside line
# 2% offset mitigates topology floating-point errors
linestring = [QgsPoint(points[z])]
if (z == 0):
linestring.append(mmqgis_endpoint(points[z], width, b1 + bearing))
else:
linestring.append(mmqgis_endpoint(points[z], width, b1 + (1.02 * bearing)))
linestring.append(mmqgis_endpoint(points[z + 1], width, b1 + bearing))
# Determine if rounded convex elbow is needed
if (z < (len(points) - 2)):
b2 = mmqgis_bearing(points[z + 1], points[z + 2]) % 360
elbow = b2 - b1
if (elbow < -180):
elbow = elbow + 360
elif (elbow > 180):
elbow = elbow - 360
# print unicode(b1) + ", " + unicode(b2) + " = " + unicode(elbow)
# 8-step interpolation of arc
if (((bearing > 0) and (elbow < 0)) or \
((bearing < 0) and (elbow > 0))):
for a in range(1,8):
b = b1 + (elbow * a / 8.0) + bearing
linestring.append(mmqgis_endpoint(points[z + 1], width, b))
# print " arc: " + unicode(b)
linestring.append(mmqgis_endpoint(points[z + 1], width, b2 + bearing))
# Close polygon
linestring.append(QgsPoint(points[z + 1]))
linestring.append(QgsPoint(points[z]))
segment = QgsGeometry.fromPolygon([linestring])
# print linestring
# print " Line to polygon " + str(segment.isGeosValid())
if (polygon == None):
polygon = segment
else:
polygon = polygon.combine(segment)
#print " Polygon build " + str(polygon.isGeosValid())
#if not polygon.isGeosValid():
# print polygon.asPolygon()
# print " Final polygon " + str(polygon.isGeosValid())
return polygon
def mmqgis_line_center(geometry, distance_percent):
try:
geometry_type = geometry.wkbType()
except:
return None
# Find the list of node points
# This function is only really meaningful for linestrings
if (geometry_type == QGis.WKBPoint) or (geometry_type == QGis.WKBPoint25D):
return geometry
elif (geometry_type == QGis.WKBLineString) or (geometry_type == QGis.WKBLineString25D):
points = geometry.asPolyline()
elif (geometry_type == QGis.WKBPolygon) or (geometry_type == QGis.WKBPolygon25D):
points = geometry.asPolygon()[0]
elif (geometry_type == QGis.WKBMultiPoint) or (geometry_type == QGis.WKBMultiPoint25D):
points = geometry.asMultiPoint()
elif (geometry_type == QGis.WKBMultiLineString) or (geometry_type == QGis.WKBMultiLineString25D):
points = geometry.asMultiPolyline()[0]
elif (geometry_type == QGis.WKBMultiPolygon) or (geometry_type == QGis.WKBMultiPolygon25D):
points = geometry.asMultiPolygon()[0][0]
else:
return None
# Returns for invalid parameters
if (len(points) <= 0):
return None
if (len(points) <= 1):
return QgsGeometry.fromPoint(points[0])
if (distance_percent <= 0):
return QgsGeometry.fromPoint(points[0])
if (distance_percent >= 100):
return QgsGeometry.fromPoint(points[len(points) - 1])
# Find lengths of segments between nodes
segment_length = []
for index in range(0, len(points) - 1):
point1 = points[index]
point2 = points[index + 1]
length = sqrt(((point1.x() - point2.x())**2) + ((point1.y() - point2.y())**2))
segment_length = segment_length + [length]
# Find the point on the appropriate segment line
segment_start = 0
distance = sum(segment_length) * distance_percent / 100.0
for index in range(0, len(segment_length)):
segment_end = segment_start + segment_length[index]
if (distance >= segment_start) and (distance <= segment_end):
if (segment_length[index] <= 0):
ratio = 0
else:
ratio = (distance - segment_start) / segment_length[index]
xdiff = points[index + 1].x() - points[index].x()
ydiff = points[index + 1].y() - points[index].y()
linex = points[index].x() + (xdiff * ratio)
liney = points[index].y() + (ydiff * ratio)
return QgsGeometry.fromPoint(QgsPoint(linex, liney))
segment_start = segment_end
# Graceful failure - Shouldn't ever get here
return QgsGeometry.fromPoint(points[0])
# --------------------------------------------------------
# mmqgis_street_address_join - join address CSV
# with vector shapes using fuzzy address match
# --------------------------------------------------------
def mmqgis_street_address_join(qgis, shapelayer, shapeaddress, csvname, csvaddress, outfilename, notfoundname, addlayer):
# Find the layer of shapes
layer = mmqgis_find_layer(shapelayer)
if layer == None:
return "Shape layer not found: " + layername
layer_index = layer.fieldNameIndex(shapeaddress)
if (layer_index < 0):
return "Shape layer address field " + shapeaddress + " not found"
if len(csvname) <= 0:
return "No CSV address file given"
mmqgis_status_message(qgis, "Loading and processing CSV file");
# Read the CSV addresses into memory
try:
infile = open(csvname, 'r')
dialect = csv.Sniffer().sniff(infile.read(4096))
infile.seek(0)
reader = csv.reader(infile, dialect)
addresses = list(reader)
del reader
del infile
except Exception as e:
return unicode(csvname) + ": " + unicode(e)
# Decode from UTF-8 characters because csv.reader can only handle 8-bit characters
for rownum, row in enumerate(addresses):
try:
addresses[rownum] = [unicode(field, "utf-8") for field in row]
except:
return "Row " + unicode(rownum) + " in CSV file not in UTF-8 encoding"
# Find the address field from the CSV file
header = addresses[0]
del addresses[0]
try:
csvindex = header.index(csvaddress)
except:
return "Column " + unicode(csvindex) + " not found in " + unicode(csvname)
# Combine attribute fields
fields = QgsFields()
for field in layer.fields():
fields.append(field)
for field in header:
newname = field[0:10].strip()
if (fields.indexFromName(newname) >= 0):
newname = newname[0:9] + '2'
fields.append(QgsField(newname, QVariant.String))
# notfound file for addresses that were not numeric or were not joined
try:
notfound = open(notfoundname, 'w')
notfoundwriter = csv.writer(notfound, dialect)
# Encoding is forced to UTF-8 because CSV writer doesn't support Unicode
notfoundwriter.writerow([field.encode("utf-8") for field in header])
except:
return "Failure opening " + notfoundname
# Create the output shapefile
if QFile(outfilename).exists():
if not QgsVectorFileWriter.deleteShapeFile(outfilename):
return "Failure deleting existing shapefile: " + outfilename
outfile = QgsVectorFileWriter(outfilename, "utf-8", fields, layer.wkbType(), layer.crs())
if (outfile.hasError() != QgsVectorFileWriter.NoError):
return "Failure creating output shapefile: " + unicode(outfile.errorMessage())
# Iterate through each feature in the shape layer
matched_count = 0