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Mini Shell
Mini Shell
#
# jVectorMap version 2.0.4
#
# Copyright 2011-2013, Kirill Lebedev
#
import sys
import shapely.geometry
import shapely.wkb
import shapely.affinity
from osgeo import ogr
from osgeo import osr
import json
import codecs
import copy
class Map:
def __init__(self, name, language):
self.paths = {}
self.name = name
self.language = language
self.width = 0
self.height = 0
self.bbox = []
def addPath(self, path, code, name):
self.paths[code] = {"path": path, "name": name}
def getJSCode(self):
map = {"paths": self.paths, "width": self.width, "height": self.height, "insets": self.insets, "projection": self.projection}
return "jQuery.fn.vectorMap('addMap', '"+self.name+"_"+self.projection['type']+"_"+self.language+"',"+json.dumps(map)+');'
class Converter:
def __init__(self, config):
args = {
'buffer_distance': -0.4,
'simplify_tolerance': 0.2,
'longitude0': 0,
'projection': 'mill',
'name': 'world',
'width': 900,
'language': 'en',
'precision': 2,
'insets': []
}
args.update(config)
self.map = Map(args['name'], args.get('language'))
if args.get('sources'):
self.sources = args['sources']
else:
self.sources = [{
'input_file': args.get('input_file'),
'where': args.get('where'),
'name_field': args.get('name_field'),
'code_field': args.get('code_field'),
'input_file_encoding': args.get('input_file_encoding')
}]
default_source = {
'where': '',
'name_field': 0,
'code_field': 1,
'input_file_encoding': 'iso-8859-1'
}
for index in range(len(self.sources)):
for key in default_source:
if self.sources[index].get(key) is None:
self.sources[index][key] = default_source[key]
self.features = {}
self.width = args.get('width')
self.minimal_area = args.get('minimal_area')
self.longitude0 = float(args.get('longitude0'))
self.projection = args.get('projection')
self.precision = args.get('precision')
self.buffer_distance = args.get('buffer_distance')
self.simplify_tolerance = args.get('simplify_tolerance')
self.for_each = args.get('for_each')
self.emulate_longitude0 = args.get('emulate_longitude0')
if args.get('emulate_longitude0') is None and (self.projection == 'merc' or self.projection =='mill') and self.longitude0 != 0:
self.emulate_longitude0 = True
if args.get('viewport'):
self.viewport = map(lambda s: float(s), args.get('viewport').split(' '))
else:
self.viewport = False
# spatial reference to convert to
self.spatialRef = osr.SpatialReference()
projString = '+proj='+str(self.projection)+' +a=6381372 +b=6381372 +lat_0=0'
if not self.emulate_longitude0:
projString += ' +lon_0='+str(self.longitude0)
self.spatialRef.ImportFromProj4(projString)
# handle map insets
if args.get('insets'):
self.insets = args.get('insets')
else:
self.insets = []
def loadData(self):
for sourceConfig in self.sources:
self.loadDataSource( sourceConfig )
def loadDataSource(self, sourceConfig):
source = ogr.Open( sourceConfig['input_file'] )
layer = source.GetLayer(0)
layer.SetAttributeFilter( sourceConfig['where'].encode('ascii') )
self.viewportRect = False
transformation = osr.CoordinateTransformation( layer.GetSpatialRef(), self.spatialRef )
if self.viewport:
layer.SetSpatialFilterRect( *self.viewport )
point1 = transformation.TransformPoint(self.viewport[0], self.viewport[1])
point2 = transformation.TransformPoint(self.viewport[2], self.viewport[3])
self.viewportRect = shapely.geometry.box(point1[0], point1[1], point2[0], point2[1])
layer.ResetReading()
codes = {}
if self.emulate_longitude0:
meridian = -180 + self.longitude0
p1 = transformation.TransformPoint(-180, 89)
p2 = transformation.TransformPoint(meridian, -89)
left = shapely.geometry.box(p1[0], p1[1], p2[0], p2[1])
p3 = transformation.TransformPoint(meridian, 89)
p4 = transformation.TransformPoint(180, -89)
right = shapely.geometry.box(p3[0], p3[1], p4[0], p4[1])
# load features
nextCode = 0
for feature in layer:
geometry = feature.GetGeometryRef()
geometryType = geometry.GetGeometryType()
if geometryType == ogr.wkbPolygon or geometryType == ogr.wkbMultiPolygon:
geometry.TransformTo( self.spatialRef )
shapelyGeometry = shapely.wkb.loads( geometry.ExportToWkb() )
if not shapelyGeometry.is_valid:
shapelyGeometry = shapelyGeometry.buffer(0, 1)
if self.emulate_longitude0:
leftPart = shapely.affinity.translate(shapelyGeometry.intersection(left), p4[0] - p3[0])
rightPart = shapely.affinity.translate(shapelyGeometry.intersection(right), p1[0] - p2[0])
shapelyGeometry = leftPart.buffer(0.1, 1).union(rightPart.buffer(0.1, 1)).buffer(-0.1, 1)
if not shapelyGeometry.is_valid:
shapelyGeometry = shapelyGeometry.buffer(0, 1)
shapelyGeometry = self.applyFilters(shapelyGeometry)
if shapelyGeometry:
name = feature.GetFieldAsString(str(sourceConfig.get('name_field'))).decode(sourceConfig.get('input_file_encoding'))
code = feature.GetFieldAsString(str(sourceConfig.get('code_field'))).decode(sourceConfig.get('input_file_encoding'))
if code in codes:
code = '_' + str(nextCode)
nextCode += 1
codes[code] = name
self.features[code] = {"geometry": shapelyGeometry, "name": name, "code": code}
else:
raise Exception, "Wrong geometry type: "+geometryType
def convert(self, outputFile):
print 'Generating '+outputFile
self.loadData()
codes = self.features.keys()
main_codes = copy.copy(codes)
self.map.insets = []
envelope = []
for inset in self.insets:
insetBbox = self.renderMapInset(inset['codes'], inset['left'], inset['top'], inset['width'])
insetHeight = (insetBbox[3] - insetBbox[1]) * (inset['width'] / (insetBbox[2] - insetBbox[0]))
self.map.insets.append({
"bbox": [{"x": insetBbox[0], "y": -insetBbox[3]}, {"x": insetBbox[2], "y": -insetBbox[1]}],
"left": inset['left'],
"top": inset['top'],
"width": inset['width'],
"height": insetHeight
})
envelope.append(
shapely.geometry.box(
inset['left'], inset['top'], inset['left'] + inset['width'], inset['top'] + insetHeight
)
)
for code in inset['codes']:
main_codes.remove(code)
insetBbox = self.renderMapInset(main_codes, 0, 0, self.width)
insetHeight = (insetBbox[3] - insetBbox[1]) * (self.width / (insetBbox[2] - insetBbox[0]))
envelope.append( shapely.geometry.box( 0, 0, self.width, insetHeight ) )
mapBbox = shapely.geometry.MultiPolygon( envelope ).bounds
self.map.width = mapBbox[2] - mapBbox[0]
self.map.height = mapBbox[3] - mapBbox[1]
self.map.insets.append({
"bbox": [{"x": insetBbox[0], "y": -insetBbox[3]}, {"x": insetBbox[2], "y": -insetBbox[1]}],
"left": 0,
"top": 0,
"width": self.width,
"height": insetHeight
})
self.map.projection = {"type": self.projection, "centralMeridian": float(self.longitude0)}
open(outputFile, 'w').write( self.map.getJSCode() )
if self.for_each is not None:
for code in codes:
childConfig = copy.deepcopy(self.for_each)
for param in ('input_file', 'output_file', 'where', 'name'):
childConfig[param] = childConfig[param].replace('{{code}}', code.lower())
converter = Converter(childConfig)
converter.convert(childConfig['output_file'])
def renderMapInset(self, codes, left, top, width):
envelope = []
for code in codes:
envelope.append( self.features[code]['geometry'].envelope )
bbox = shapely.geometry.MultiPolygon( envelope ).bounds
scale = (bbox[2]-bbox[0]) / width
# generate SVG paths
for code in codes:
feature = self.features[code]
geometry = feature['geometry']
if self.buffer_distance:
geometry = geometry.buffer(self.buffer_distance*scale, 1)
if geometry.is_empty:
continue
if self.simplify_tolerance:
geometry = geometry.simplify(self.simplify_tolerance*scale, preserve_topology=True)
if isinstance(geometry, shapely.geometry.multipolygon.MultiPolygon):
polygons = geometry.geoms
else:
polygons = [geometry]
path = ''
for polygon in polygons:
rings = []
rings.append(polygon.exterior)
rings.extend(polygon.interiors)
for ring in rings:
for pointIndex in range( len(ring.coords) ):
point = ring.coords[pointIndex]
if pointIndex == 0:
path += 'M'+str( round( (point[0]-bbox[0]) / scale + left, self.precision) )
path += ','+str( round( (bbox[3] - point[1]) / scale + top, self.precision) )
else:
path += 'l' + str( round(point[0]/scale - ring.coords[pointIndex-1][0]/scale, self.precision) )
path += ',' + str( round(ring.coords[pointIndex-1][1]/scale - point[1]/scale, self.precision) )
path += 'Z'
self.map.addPath(path, feature['code'], feature['name'])
return bbox
def applyFilters(self, geometry):
if self.viewportRect:
geometry = self.filterByViewport(geometry)
if not geometry:
return False
if self.minimal_area:
geometry = self.filterByMinimalArea(geometry)
if not geometry:
return False
return geometry
def filterByViewport(self, geometry):
try:
return geometry.intersection(self.viewportRect)
except shapely.geos.TopologicalError:
return False
def filterByMinimalArea(self, geometry):
if isinstance(geometry, shapely.geometry.multipolygon.MultiPolygon):
polygons = geometry.geoms
else:
polygons = [geometry]
polygons = filter(lambda p: p.area > self.minimal_area, polygons)
return shapely.geometry.multipolygon.MultiPolygon(polygons)
args = {}
if len(sys.argv) > 1:
paramsJson = open(sys.argv[1], 'r').read()
else:
paramsJson = sys.stdin.read()
paramsJson = json.loads(paramsJson)
converter = Converter(paramsJson)
converter.convert(paramsJson['output_file'])
Zerion Mini Shell 1.0