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leaflet.py
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leaflet.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
leaflet
A QGIS plugin
Load a webmap directly into QGIS
Generated by Plugin Builder: http://g-sherman.github.io/Qgis-Plugin-Builder/
-------------------
begin : 2018-05-11
git sha : $Format:%H$
copyright : (C) 2018 by Tom Chadwin
email : tom.chadwin@nnpa.org.uk
***************************************************************************/
/***************************************************************************
* *
* 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import os, random
from datetime import datetime
from PyQt5.QtCore import QDir
from qgis.core import (QgsVectorLayer,
QgsPointXY,
QgsFeature,
QgsGeometry,
QgsProject,
QgsRectangle,
QgsCoordinateReferenceSystem,
QgsCoordinateTransform)
def detectLeaflet(mainframe):
detectResult = mainframe.evaluateJavaScript("L.version")
if detectResult is None:
result = False
else:
result = True
return result
def getLeafletMap(mainframe, iface):
scriptFolder = os.path.join(os.path.dirname(__file__), "js")
scriptPath = os.path.join(scriptFolder, "getLeafletMap.js")
with open(scriptPath, 'r') as scriptFile:
script = scriptFile.read()
lyrs = None
lyrs = mainframe.evaluateJavaScript(script)
while lyrs is None:
print("Retrieving layers")
for count, lyr in enumerate(lyrs):
if lyr[0] == "xyz":
print("xyz")
xyzUrl = lyr[1].replace("{s}", random.choice("abc")).replace("{r}",
"")
for opt, val in lyr[2].items():
# print(opt, val)
try:
xyzUrl = xyzUrl.replace("{" + opt + "}", val)
except:
pass
iface.addRasterLayer("type=xyz&url=" + xyzUrl, xyzUrl, "wms")
elif lyr[0] == "vector":
print("vector")
tempDir = os.path.join(
unicode(QDir.tempPath()),
'web2qgis',
datetime.now().strftime("%Y_%m_%d-%H_%M_%S_%f"))
if not QDir(tempDir).exists():
QDir().mkpath(tempDir)
vectorPath = os.path.join(tempDir,
"vector" + str(count) + ".geojson")
with open(vectorPath, 'w') as vectorFile:
vectorFile.write(lyr[1])
vectorLayer = QgsVectorLayer(vectorPath,
"vector" + str(count),
"ogr")
# Update extent of the layer
vectorLayer.updateExtents()
# Add the layer to the Layers panel
QgsProject.instance().addMapLayers([vectorLayer])
else:
print("Unsupported layer type")
scriptPath = os.path.join(scriptFolder, "getLeafletView.js")
with open(scriptPath, 'r') as scriptFile:
script = scriptFile.read()
extent = None
extent = mainframe.evaluateJavaScript(script)
while extent is None:
print("Retrieving extent")
xMin, yMin, xMax, yMax = extent.split(",")
canvas = iface.mapCanvas()
xform = QgsCoordinateTransform(QgsCoordinateReferenceSystem(4326),
canvas.mapSettings().destinationCrs(),
QgsProject.instance())
srcExtent = QgsRectangle(float(xMin), float(yMin),
float(xMax), float(yMax))
dstExtent = xform.transformBoundingBox(srcExtent)
canvas.setExtent(dstExtent)
canvas.refresh()