def initVectorViewer(request, shapefile_id):
try:
shapefile = Shapefile.objects.get(id=shapefile_id, created_by=request.user)
nodes = shapefile.get_ancestors(include_self=True).exclude(level=0)
features = Feature.objects.filter(shapefile=shapefile)
geometryField = calcGeometryField(shapefile.geom_type)
except Shapefile.DoesNotExist or Feature.DoesNotExist:
raise Http404
bounds = list(features.extent(field_name=geometryField))
tmsURL = "http://" + request.get_host() + "/basqui/tms/"
html = render_to_string("layers/vector/layers_vector_viewer.html", {'nodes': nodes, 'shapefile': shapefile },context_instance=RequestContext(request))
js = render_to_string("layers/vector/js/layers_vector_viewer.js", {'bounds': bounds, 'shapefile' : shapefile, 'tmsURL' : tmsURL},context_instance=RequestContext(request))
response = json.dumps({'html': html, 'js':js})
return HttpResponse(response, content_type="application/json")
def simplifyVectorLayer(request):
post_dict = dict(request.POST.copy().iteritems())
layer_id = post_dict['id']
ratio = post_dict['ratio']
layer = Shapefile.objects.get(pk=layer_id)
features = Feature.objects.filter(shapefile=layer)
geometryField = calcGeometryField(layer.geom_type)
for feat in features:
geometry = getattr(feat, geometryField)
simplifier = GDALSimplifier(geometry.ogr)
VWGeometry = simplifier.from_ratio(float(ratio))
setattr(feat, geometryField, VWGeometry.wkt)
feat.save()
response = "Layer simplified"
return HttpResponse(response, content_type="application/json")
def initLightVectorViewer(request, shapefile_id):
try:
post_dict = dict(request.POST.copy().iteritems())
x = int(post_dict['position[right]']) + 5
y = int(post_dict['position[top]'])
id_relat = post_dict['id']
shapefile = Shapefile.objects.get(id=shapefile_id, created_by=request.user)
feature = Feature.objects.get(shapefile=shapefile, id_relat=id_relat)
geometryField = calcGeometryField(shapefile.geom_type)
geometry = getattr(feature, geometryField)
bounds = list(geometry.extent)
except Shapefile.DoesNotExist or Feature.DoesNotExist:
raise Http404
except AttributeError:
bounds = []
response = json.dumps({'feat_id': feature.pk, 'x': x, 'y': y, 'bounds': bounds})
return HttpResponse(response, content_type="application/json")
def saveEdits(request):
try:
post_dict = dict(request.POST.copy().iteritems())
layer_id = post_dict['layer_id']
layer = Shapefile.objects.get(id=layer_id, created_by=request.user)
geometryField = calcGeometryField(layer.geom_type)
featureCollection = json.loads(post_dict['feature'])
for feature in featureCollection['features']:
try:
feat_id = feature['properties']['feat_id']
feat = Feature.objects.get(id_relat=int(feat_id), shapefile=layer)
except KeyError:
feat = Feature.objects.create(shapefile=layer)
setattr(feat, geometryField, json.dumps(feature['geometry']))
feat.save()
return HttpResponse('')
except:
traceback.print_exc()
return HttpResponse("")
def selectFeature(request):
try:
post_dict = dict(request.POST.copy().iteritems())
layer_id = int(post_dict['layer_id'])
latitude = float(post_dict['latitude'])
longitude = float(post_dict['longitude'])
layer = Shapefile.objects.get(id=layer_id, created_by=request.user)
query = findFeature(layer, longitude, latitude)
if query:
geometryField = calcGeometryField(layer.geom_type)
SQLQuery = "SELECT row_to_json(f) As %s \
FROM (SELECT 'Feature' As type \
, ST_AsGeoJSON(%s)::json As geometry \
, row_to_json((SELECT l FROM (SELECT id_relat AS feat_id) As l)) As properties \
FROM layers_feature As l WHERE l.id = %s ) As f;" % (layer.geom_type, geometryField, query.pk)
cursor = connection.cursor()
cursor.execute(SQLQuery)
row = cursor.fetchone()[0]
response = json.dumps({'geojson':row, 'feat_id':query.pk})
return HttpResponse(response,content_type="application/json")
else: return HttpResponse("")
except:
traceback.print_exc()
return HttpResponse("")
