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leafletWriter.py
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leafletWriter.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
qgis2web
(c) Tom Chadwin
leafletWriter.py original by:
-------------------
begin : 2014-04-29
copyright : (C) 2013 by Riccardo Klinger
email : riccardo.klinger@geolicious.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 3 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
from qgis.core import (Qgis,
QgsApplication,
QgsProject,
QgsCoordinateReferenceSystem,
QgsCoordinateTransform,
QgsMapLayer,
QgsWkbTypes,
QgsMessageLog)
import traceback
from qgis.PyQt.QtCore import Qt, QObject
from qgis.PyQt.QtGui import QCursor
from qgis.PyQt.QtWidgets import QApplication
import os
from datetime import datetime
import re
from qgis2web.leafletFileScripts import (writeFoldersAndFiles,
writeCSS,
writeHTMLstart)
from qgis2web.leafletLayerScripts import writeVectorLayer
from qgis2web.leafletScriptStrings import (jsonScript,
scaleDependentLabelScript,
mapScript,
featureGroupsScript,
extentScript,
rasterScript,
wmsScript,
scaleDependentLayerScript,
addressSearchScript,
endHTMLscript,
addLayersList,
highlightScript,
crsScript,
scaleBar,
scaleDependentScript,
titleSubScript,
getVTStyles,
getVTLabels)
from qgis2web.utils import (ALL_ATTRIBUTES, exportVector,
exportRaster, safeName, returnFilterValues)
from qgis2web.writer import (Writer,
WriterResult,
translator)
from qgis2web.feedbackDialog import Feedback
class LeafletWriter(Writer):
"""
Writer for creation of web maps based on the Leaflet
JavaScript library.
"""
def __init__(self):
super(LeafletWriter, self).__init__()
@classmethod
def type(cls):
return 'leaflet'
@classmethod
def name(cls):
return QObject.tr(translator, 'Leaflet')
def write(self, iface, dest_folder, feedback=None):
if not feedback:
feedback = Feedback()
feedback.showFeedback('Creating Leaflet map...')
self.preview_file = self.writeLeaflet(
iface,
feedback,
layer_list=self.layers,
groups=self.groups,
popup=self.popup,
visible=self.visible,
interactive=self.interactive,
json=self.json,
cluster=self.cluster,
getFeatureInfo=self.getFeatureInfo,
params=self.params,
folder=dest_folder)
result = WriterResult()
result.index_file = self.preview_file
result.folder = os.path.dirname(self.preview_file)
for dirpath, dirnames, filenames in os.walk(result.folder):
result.files.extend([os.path.join(dirpath, f) for f in filenames])
return result
@classmethod
def writeLeaflet(
cls, iface, feedback, folder,
layer_list, groups, visible, interactive, cluster,
json, getFeatureInfo, params, popup):
outputProjectFileName = folder
QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
legends = {}
mapUnitLayers = []
canvas = iface.mapCanvas()
project = QgsProject.instance()
mapSettings = canvas.mapSettings()
title = project.title()
abstract = project.metadata().abstract()
pluginDir = os.path.dirname(os.path.realpath(__file__))
stamp = datetime.now().strftime("%Y_%m_%d-%H_%M_%S_%f")
outputProjectFileName = os.path.join(outputProjectFileName,
'qgis2web_' + stamp)
outputIndex = os.path.join(outputProjectFileName, 'index.html')
minify = params["Data export"]["Minify GeoJSON files"]
precision = params["Data export"]["Precision"]
extent = params["Scale/Zoom"]["Extent"]
minZoom = params["Scale/Zoom"]["Min zoom level"]
maxZoom = params["Scale/Zoom"]["Max zoom level"]
restrictToExtent = params["Scale/Zoom"]["Restrict to extent"]
matchCRS = params["Appearance"]["Match project CRS"]
addressSearch = params["Appearance"]["Add address search"]
abstractOptions = params["Appearance"]["Add abstract"]
locate = params["Appearance"]["Geolocate user"]
measure = params["Appearance"]["Measure tool"]
highlight = params["Appearance"]["Highlight on hover"]
layerSearch = params["Appearance"]["Layer search"]
layerFilter = params["Appearance"]["Attribute filter"]
popupsOnHover = params["Appearance"]["Show popups on hover"]
template = params["Appearance"]["Template"]
widgetAccent = params["Appearance"]["Widget Icon"]
widgetBackground = params["Appearance"]["Widget Background"]
usedFields = [ALL_ATTRIBUTES] * len(popup)
QgsApplication.initQgis()
dataStore, cssStore = writeFoldersAndFiles(pluginDir, feedback,
outputProjectFileName,
cluster, measure,
matchCRS, layerSearch,
layerFilter, canvas,
addressSearch, locate)
writeCSS(cssStore, mapSettings.backgroundColor().name(), feedback,
widgetAccent, widgetBackground)
wfsLayers = ""
labelCode = ""
vtLabels = {}
vtStyles = {}
useMultiStyle = False
useHeat = False
useVT = False
useShapes = False
useOSMB = False
useWMS = False
useWMTS = False
useRaster = False
scaleDependentLayers = ""
labelVisibility = ""
new_src = ""
jsons = ""
crs = QgsCoordinateReferenceSystem.EpsgCrsId
exp_crs = QgsCoordinateReferenceSystem(4326, crs)
lyrCount = 0
for layer, jsonEncode, eachPopup, clst in zip(layer_list, json,
popup, cluster):
rawLayerName = layer.name()
safeLayerName = safeName(rawLayerName) + "_" + str(lyrCount)
vts = layer.customProperty("VectorTilesReader/vector_tile_url")
if layer.providerType() != 'WFS' or jsonEncode is True:
if layer.type() == QgsMapLayer.VectorLayer and vts is None:
feedback.showFeedback('Exporting %s to JSON...' %
layer.name())
exportVector(layer, safeLayerName, dataStore,
restrictToExtent, iface, extent, precision,
exp_crs, minify)
jsons += jsonScript(safeLayerName)
scaleDependentLabels = \
scaleDependentLabelScript(layer, safeLayerName)
labelVisibility += scaleDependentLabels
feedback.completeStep()
elif layer.type() == QgsMapLayer.RasterLayer:
if layer.dataProvider().name() != "wms":
layersFolder = os.path.join(outputProjectFileName,
"data")
exportRaster(layer, lyrCount, layersFolder,
feedback, iface, matchCRS)
if layer.hasScaleBasedVisibility():
scaleDependentLayers += scaleDependentLayerScript(
layer, safeLayerName, clst)
lyrCount += 1
if scaleDependentLayers != "":
scaleDependentLayers = scaleDependentScript(scaleDependentLayers)
crsSrc = mapSettings.destinationCrs()
crsAuthId = crsSrc.authid()
crsProj4 = crsSrc.toProj4()
middle = """
"""
if highlight or popupsOnHover:
selectionColor = mapSettings.selectionColor().name()
middle += highlightScript(highlight, popupsOnHover, selectionColor)
if extent == "Canvas extent":
pt0 = canvas.extent()
crsDest = QgsCoordinateReferenceSystem(4326)
try:
xform = QgsCoordinateTransform(crsSrc, crsDest,
QgsProject.instance())
except Exception:
xform = QgsCoordinateTransform(crsSrc, crsDest)
pt1 = xform.transformBoundingBox(pt0)
bounds = '[[' + str(pt1.yMinimum()) + ','
bounds += str(pt1.xMinimum()) + '],['
bounds += str(pt1.yMaximum()) + ','
bounds += str(pt1.xMaximum()) + ']]'
if matchCRS and crsAuthId != 'EPSG:4326':
middle += crsScript(crsAuthId, crsProj4)
else:
bounds = 0
if matchCRS and crsAuthId != 'EPSG:4326':
middle += crsScript(crsAuthId, crsProj4)
middle += mapScript(extent, matchCRS, crsAuthId, measure, maxZoom,
minZoom, bounds, locate)
middle += featureGroupsScript()
extentCode = extentScript(extent, restrictToExtent)
new_src += middle
new_src += extentCode
for count, layer in enumerate(layer_list):
rawLayerName = layer.name()
safeLayerName = safeName(rawLayerName) + "_" + str(count)
if (layer.type() == QgsMapLayer.VectorLayer and
layer.wkbType() != QgsWkbTypes.NoGeometry):
(new_src,
legends,
wfsLayers,
labelCode,
vtLabels,
vtStyles,
useMapUnits,
useMultiStyle,
useHeat,
useVT,
useShapes,
useOSMB) = writeVectorLayer(layer, safeLayerName,
usedFields[count], highlight,
popupsOnHover, popup[count],
outputProjectFileName,
wfsLayers, cluster[count],
visible[count],
interactive[count], json[count],
legends, new_src, canvas, count,
restrictToExtent, extent,
feedback, labelCode, vtLabels,
vtStyles, useMultiStyle, useHeat,
useVT, useShapes, useOSMB)
if useMapUnits:
mapUnitLayers.append(safeLayerName)
elif layer.type() == QgsMapLayer.RasterLayer:
if layer.dataProvider().name() == "wms":
feedback.showFeedback('Writing %s as WMS layer...' %
layer.name())
new_obj, useWMS, useWMTS = wmsScript(layer, safeLayerName,
useWMS, useWMTS,
getFeatureInfo[count],
minZoom, maxZoom,
count)
feedback.completeStep()
else:
useRaster = True
feedback.showFeedback('Writing %s as raster layer...' %
layer.name())
new_obj = rasterScript(layer, safeLayerName, count)
feedback.completeStep()
if visible[count]:
new_obj += """
map.addLayer(layer_""" + safeLayerName + """);"""
new_src += new_obj
the_src = new_src
new_src = jsons + """
<script>"""
if len(mapUnitLayers) > 0:
new_src += """
var m2px = 1;
function newM2px() {
var centerLatLng = map.getCenter();
var pointC = map.latLngToContainerPoint(centerLatLng);
var pointX = [pointC.x + 100, pointC.y];
var latLngC = map.containerPointToLatLng(pointC);
var latLngX = map.containerPointToLatLng(pointX);
var distanceX = latLngC.distanceTo(latLngX)/100;
reciprocal = 1 / distanceX;
m2px = reciprocal;
}
function geoStyle(m) {
return Math.ceil(m * m2px);
}"""
new_src += getVTStyles(vtStyles)
new_src += getVTLabels(vtLabels)
new_src += the_src + scaleDependentLayers
if title != "":
titleStart = titleSubScript(title, 1, "upper right")
new_src += titleStart
if abstract != "":
abstractStart = titleSubScript(abstract, 2, abstractOptions)
new_src += abstractStart
if addressSearch:
address_text = addressSearchScript()
new_src += address_text
if (params["Appearance"]["Add layers list"] and
params["Appearance"]["Add layers list"] != "" and
params["Appearance"]["Add layers list"] != "None"):
new_src += addLayersList(
[], matchCRS, layer_list, groups, cluster, legends,
params["Appearance"]["Add layers list"] == "Expanded")
if project.readBoolEntry("ScaleBar", "/Enabled", False)[0]:
# placement = project.readNumEntry("ScaleBar", "/Placement", 0)[0]
# placement = PLACEMENT[placement]
# end = scaleBar(placement)
end = scaleBar()
else:
end = ''
layerType = "layer"
try:
if cluster[count]:
layerType = "cluster"
except Exception:
pass
searchLayer = "%s_%s" % (layerType,
params["Appearance"]["Search layer"])
filterItems = []
for item in params["Appearance"]["Attribute filter"]:
filterItem = returnFilterValues(layer_list,
item.text().split(": ")[0],
item.text().split(": ")[1])
if filterItem:
filterItems.append(filterItem)
labelList = []
for count, layer in enumerate(layer_list):
vts = layer.customProperty("VectorTilesReader/vector_tile_url")
safeLayerName = safeName(layer.name()) + "_" + str(count)
if (layer.type() == QgsMapLayer.VectorLayer and vts is None):
labelling = layer.labeling()
if labelling is not None:
palyr = labelling.settings()
if palyr.fieldName and palyr.fieldName != "":
labelList.append("layer_%s" % safeLayerName)
labelsList = ",".join(labelList)
end += endHTMLscript(wfsLayers, layerSearch, filterItems, labelCode,
labelVisibility, searchLayer, useHeat,
useRaster, labelsList, mapUnitLayers)
new_src += end
try:
writeHTMLstart(outputIndex, title, cluster, addressSearch,
measure, matchCRS, layerSearch, filterItems, canvas,
locate, new_src, template, feedback, useMultiStyle,
useHeat, useShapes, useOSMB, useWMS, useWMTS, useVT)
except Exception:
QgsMessageLog.logMessage(traceback.format_exc(),
"qgis2web", level=Qgis.Critical)
finally:
QApplication.restoreOverrideCursor()
return outputIndex