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olwriter.py
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olwriter.py
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# qgis-ol3 Creates OpenLayers map from QGIS layers
# Copyright (C) 2014 Victor Olaya ([email protected])
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import codecs
import os
import re
import math
import shutil
from qgis.core import *
from utils import exportLayers, safeName
from qgis.utils import iface
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from utils import ALL_ATTRIBUTES
baseLayers = {
"Stamen watercolor": "new ol.layer.Tile({title: 'Stamen watercolor', source: new ol.source.Stamen({layer: 'watercolor'})})",
"Stamen toner": "new ol.layer.Tile({title: 'Stamen toner', source: new ol.source.Stamen({layer: 'toner'})})",
"OSM": "new ol.layer.Tile({title: 'OSM', source: new ol.source.OSM()})",
"MapQuest": "new ol.layer.Tile({title: 'MapQuest', source: new ol.source.MapQuest({layer: 'sat'})})"
}
baseLayerGroup = "var baseLayer = new ol.layer.Group({'title': 'Base maps',layers: [%s]});"
def writeOL(layers, groups, popup, visible, settings, folder):
QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
try:
dst = os.path.join(folder, "resources")
if not os.path.exists(dst):
shutil.copytree(os.path.join(os.path.dirname(__file__), "resources"), dst)
precision = settings["Data export"]["Precision"]
optimize = settings["Data export"]["Minify GeoJSON files"]
cleanUnusedFields = settings["Data export"]["Delete unused fields"]
if not cleanUnusedFields:
usedFields = [ALL_ATTRIBUTES] * len(popup)
else:
usedFields = popup
exportLayers(layers, folder, precision, optimize, usedFields)
exportStyles(layers, folder)
writeLayersAndGroups(layers, groups, visible, folder, settings)
geojsonVars ="\n".join(['<script src="layers/%s"></script>' % (safeName(layer.name()) + ".js")
for layer in layers if layer.type() == layer.VectorLayer])
styleVars = "\n".join(['<script src="styles/%s_style.js"></script>' % (safeName(layer.name()))
for layer in layers if layer.type() == layer.VectorLayer])
popupLayers = "popupLayers = [%s];" % ",".join(['"%s"' % field if isinstance(field, basestring) else str(field) for field in popup])
controls = []
if settings["Appearance"]["Add scale bar"]:
controls.append("new ol.control.ScaleLine({})")
if settings["Appearance"]["Add layers list"]:
controls.append('new ol.control.LayerSwitcher({tipLabel: "Layers"})')
mapbounds = bounds(settings["Scale/Zoom"]["Extent"] == "Canvas extent", layers)
mapextent = "extent: %s," % mapbounds if settings["Scale/Zoom"]["Restrict to extent"] else ""
maxZoom = int(settings["Scale/Zoom"]["Max zoom level"])
minZoom = int(settings["Scale/Zoom"]["Min zoom level"])
onHover = str(settings["Appearance"]["Show popups on hover"]).lower()
highlight = str(settings["Appearance"]["Highlight features"]).lower()
view = "%s maxZoom: %d, minZoom: %d" % (mapextent, maxZoom, minZoom)
values = {"@STYLEVARS@": styleVars,
"@GEOJSONVARS@": geojsonVars,
"@BOUNDS@": mapbounds,
"@CONTROLS@": ",".join(controls),
"@POPUPLAYERS@": popupLayers,
"@VIEW@": view,
"@ONHOVER@": onHover,
"@DOHIGHLIGHT@": highlight}
with open(os.path.join(folder, "index.html"), "w") as f:
f.write(replaceInTemplate(settings["Appearance"]["Template"] + ".html", values))
finally:
QApplication.restoreOverrideCursor()
def writeLayersAndGroups(layers, groups, visible, folder, settings):
baseLayer = baseLayerGroup % baseLayers[settings["Appearance"]["Base layer"]]
scaleVisibility = settings["Scale/Zoom"]["Use layer scale dependent visibility"]
layerVars = "\n".join([layerToJavascript(layer, scaleVisibility) for layer in layers])
groupVars = ""
groupedLayers = {}
for group, groupLayers in groups.iteritems():
groupVars += ('''var %s = new ol.layer.Group({
layers: [%s],
title: "%s"});\n''' %
("group_" + safeName(group), ",".join(["lyr_" + safeName(layer.name()) for layer in groupLayers]),
group))
for layer in groupLayers:
groupedLayers[layer.id()] = safeName(group)
mapLayers = ["baseLayer"]
usedGroups = []
for layer in layers:
mapLayers.append("lyr_" + safeName(layer.name()))
visibility = "\n".join(["%s.setVisible(%s);" % (layer, str(v).lower()) for layer, v in zip(mapLayers[1:], visible)])
#ADD Group
group_list = ["baseLayer"]
no_group_list = []
for layer in layers:
if layer.id() in groupedLayers:
groupName = groupedLayers[layer.id()]
if groupName not in usedGroups:
group_list.append("group_" + safeName(groupName))
usedGroups.append(groupName)
else:
no_group_list.append("lyr_" + safeName(layer.name()))
layersList = "var layersList = [%s];" % ",".join([layer for layer in (group_list+no_group_list)])
path = os.path.join(folder, "layers", "layers.js")
with codecs.open(path, "w","utf-8") as f:
f.write(baseLayer + "\n")
f.write(layerVars + "\n")
f.write(groupVars + "\n")
f.write(visibility + "\n")
f.write(layersList + "\n")
#f.write(write_group_list)
def replaceInTemplate(template, values):
path = os.path.join(os.path.dirname(__file__), "templates", template)
with open(path) as f:
lines = f.readlines()
s = "".join(lines)
for name,value in values.iteritems():
s = s.replace(name, value)
return s
def bounds(useCanvas, layers):
if useCanvas:
canvas = iface.mapCanvas()
canvasCrs = canvas.mapRenderer().destinationCrs()
transform = QgsCoordinateTransform(canvasCrs, QgsCoordinateReferenceSystem("EPSG:3857"))
try:
extent = transform.transform(canvas.extent())
except QgsCsException:
extent = QgsRectangle(-20026376.39, -20048966.10, 20026376.39,20048966.10)
else:
extent = None
for layer in layers:
transform = QgsCoordinateTransform(layer.crs(), QgsCoordinateReferenceSystem("EPSG:3857"))
try:
layerExtent = transform.transform(layer.extent())
except QgsCsException:
layerExtent = QgsRectangle(-20026376.39, -20048966.10, 20026376.39,20048966.10)
if extent is None:
extent = layerExtent
else:
extent.combineExtentWith(layerExtent)
return "[%f, %f, %f, %f]" % (extent.xMinimum(), extent.yMinimum(),
extent.xMaximum(), extent.yMaximum())
def layerToJavascript(layer, scaleVisibility):
#TODO: change scale to resolution
if scaleVisibility and layer.hasScaleBasedVisibility():
minResolution = "\nminResolution:%s,\n" % str(layer.minimumScale())
maxResolution = "maxResolution:%s,\n" % str(layer.maximumScale())
else:
minResolution = ""
maxResolution = ""
layerName = safeName(layer.name())
if layer.type() == layer.VectorLayer:
return ('''var lyr_%(n)s = new ol.layer.Vector({
source: new ol.source.GeoJSON({object: geojson_%(n)s}),%(min)s %(max)s
style: style_%(n)s,
title: "%(name)s"
});''' %
{"name": layer.name(), "n":layerName, "min": minResolution,
"max": maxResolution})
elif layer.type() == layer.RasterLayer:
if layer.providerType().lower() == "wms":
source = layer.source()
layers = re.search(r"layers=(.*?)(?:&|$)", source).groups(0)[0]
url = re.search(r"url=(.*?)(?:&|$)", source).groups(0)[0]
return '''var lyr_%(n)s = new ol.layer.Tile({
source: new ol.source.TileWMS(({
url: "%(url)s",
params: {"LAYERS": "%(layers)s", "TILED": "true"},
})),
title: "%(name)s"
});''' % {"layers": layers, "url": url, "n": layerName, "name": layer.name()}
elif layer.providerType().lower() == "gdal":
provider = layer.dataProvider()
transform = QgsCoordinateTransform(provider.crs(), QgsCoordinateReferenceSystem("EPSG:3857"))
extent = transform.transform(provider.extent())
sExtent = "[%f, %f, %f, %f]" % (extent.xMinimum(), extent.yMinimum(),
extent.xMaximum(), extent.yMaximum())
return '''var lyr_%(n)s = new ol.layer.Image({
opacity: 1,
title: "%(name)s",
source: new ol.source.ImageStatic({
url: "./layers/%(n)s.jpg",
projection: 'EPSG:3857',
alwaysInRange: true,
imageSize: [%(col)d, %(row)d],
imageExtent: %(extent)s
})
});''' % {"n": layerName, "extent": sExtent, "col": provider.xSize(),
"name": layer.name(), "row": provider.ySize()}
def exportStyles(layers, folder):
stylesFolder = os.path.join(folder, "styles")
QDir().mkpath(stylesFolder)
for layer in layers:
if layer.type() != layer.VectorLayer:
continue
labelsEnabled = str(layer.customProperty("labeling/enabled")).lower() == "true"
if (labelsEnabled):
labelField = layer.customProperty("labeling/fieldName")
labelText = 'feature.get("%s")' % labelField
else:
labelText = '""'
defs = ""
try:
renderer = layer.rendererV2()
layer_transparency = layer.layerTransparency()
if isinstance(renderer, QgsSingleSymbolRendererV2):
symbol = renderer.symbol()
style = "var style = " + getSymbolAsStyle(symbol, stylesFolder, layer_transparency)
value = 'var value = ""'
elif isinstance(renderer, QgsCategorizedSymbolRendererV2):
defs += "var categories_%s = {" % safeName(layer.name())
cats = []
for cat in renderer.categories():
cats.append('"%s": %s' % (cat.value(), getSymbolAsStyle(cat.symbol(), stylesFolder,layer_transparency)))
defs += ",\n".join(cats) + "};"
value = 'var value = feature.get("%s");' % renderer.classAttribute()
style = '''var style = categories_%s[value]''' % (safeName(layer.name()))
elif isinstance(renderer, QgsGraduatedSymbolRendererV2):
varName = "ranges_" + safeName(layer.name())
defs += "var %s = [" % varName
ranges = []
for ran in renderer.ranges():
symbolstyle = getSymbolAsStyle(ran.symbol(), stylesFolder,layer_transparency)
ranges.append('[%f, %f, %s]' % (ran.lowerValue(), ran.upperValue(), symbolstyle))
defs += ",\n".join(ranges) + "];"
value = 'var value = feature.get("%s");' % renderer.classAttribute()
style = '''var style = %(v)s[0][2];
for (i = 0; i < %(v)s.length; i++){
var range = %(v)s[i];
if (value > range[0] && value<=range[1]){
style = range[2];
}
}
''' % {"v": varName}
size = layer.customProperty("labeling/fontSize")
r = layer.customProperty("labeling/textColorR")
g = layer.customProperty("labeling/textColorG")
b = layer.customProperty("labeling/textColorB")
color = "rgba(%s, %s, %s, 255)" % (r,g,b)
style = '''function(feature, resolution){
%(value)s
%(style)s;
var labelText = %(label)s;
var key = value + "_" + labelText
if (!%(cache)s[key]){
var text = new ol.style.Text({
font: '%(size)spx Calibri,sans-serif',
text: labelText,
fill: new ol.style.Fill({
color: "%(color)s"
}),
});
%(cache)s[key] = new ol.style.Style({"text": text});
}
var allStyles = [%(cache)s[key]];
allStyles.push.apply(allStyles, style);
return allStyles;
}''' % {"style": style, "label": labelText, "cache": "styleCache_" + safeName(layer.name()),
"size": size, "color": color, "value": value}
except Exception, e:
style = "{}"
path = os.path.join(stylesFolder, safeName(layer.name()) + "_style.js")
with codecs.open(path, "w","utf-8") as f:
f.write('''%(defs)s
var styleCache_%(name)s={}
var style_%(name)s = %(style)s;''' %
{"defs":defs, "name":safeName(layer.name()), "style":style})
def getRGBAColor(color, alpha):
r,g,b,_ = color.split(",")
return '"rgba(%s)"' % ",".join([r, g, b, str(alpha)])
def getSymbolAsStyle(symbol, stylesFolder, layer_transparency):
styles = []
if layer_transparency == 0:
alpha = symbol.alpha()
else:
alpha = layer_transparency/float(100)
for i in xrange(symbol.symbolLayerCount()):
sl = symbol.symbolLayer(i)
props = sl.properties()
if isinstance(sl, QgsSimpleMarkerSymbolLayerV2):
color = getRGBAColor(props["color"], alpha)
style = "image: %s" % getCircle(color)
elif isinstance(sl, QgsSvgMarkerSymbolLayerV2):
path = os.path.join(stylesFolder, os.path.basename(sl.path()))
shutil.copy(sl.path(), path)
style = "image: %s" % getIcon(path, sl.size())
elif isinstance(sl, QgsSimpleLineSymbolLayerV2):
# Check for old version
if 'color' in props:
color = getRGBAColor(props["color"], alpha)
else:
color = getRGBAColor(props["line_color"], alpha)
if 'width' in props:
line_width = props["width"]
else:
line_width = props["line_width"]
if 'penstyle' in props:
line_style = props["penstyle"]
else:
line_style = props["line_style"]
style = "stroke: %s" % (getStrokeStyle(color, line_style != "solid", line_width))
elif isinstance(sl, QgsSimpleFillSymbolLayerV2):
fillColor = getRGBAColor(props["color"], alpha)
# for old version
if 'color_border' in props:
borderColor = getRGBAColor(props["color_border"], alpha)
else:
borderColor = getRGBAColor(props["outline_color"], alpha)
if 'style_border' in props:
borderStyle = props["style_border"]
else:
borderStyle = props["outline_style"]
if 'width_border' in props:
borderWidth = props["width_border"]
else:
borderWidth = props["outline_width"]
style = ('''stroke: %s,
fill: %s''' %
(getStrokeStyle(borderColor, borderStyle != "solid", borderWidth),
getFillStyle(fillColor)))
else:
style = ""
styles.append('''new ol.style.Style({
%s
})
''' % style)
return "[ %s]" % ",".join(styles)
def getCircle(color):
return ("new ol.style.Circle({radius: 3, stroke: %s, fill: %s})" %
(getStrokeStyle("'rgba(0,0,0,255)'", False, "0.5"), getFillStyle(color)))
def getIcon(path, size):
size = math.floor(float(size) * 3.8)
anchor = size / 2
return '''new ol.style.Icon({
size: [%(s)d, %(s)d],
anchor: [%(a)d, %(a)d],
anchorXUnits: "pixels",
anchorYUnits: "pixels",
src: "%(path)s"
})''' % {"s": size, "a":anchor, "path": path.replace("\\", "\\\\")}
def getStrokeStyle(color, dashed, width):
width = math.floor(float(width) * 3.8)
dash = "[3]" if dashed else "null"
return "new ol.style.Stroke({color: %s, lineDash: %s, width: %d})" % (color, dash, width)
def getFillStyle(color):
return "new ol.style.Fill({color: %s})" % color