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writers.py
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writers.py
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# -*- coding: utf-8 -*-
#******************************************************************************
#
# QTiles
# ---------------------------------------------------------
# Generates tiles from QGIS project
#
# Copyright (C) 2012-2014 NextGIS (info@nextgis.org)
# Copyright (C) 2019 Alexander Bruy (alexander.bruy@gmail.com)
#
# This source 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 code 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.
#
# A copy of the GNU General Public License is available on the World Wide Web
# at <http://www.gnu.org/licenses/>. You can also obtain it by writing
# to the Free Software Foundation, 51 Franklin Street, Suite 500 Boston,
# MA 02110-1335 USA.
#
#******************************************************************************
import json
import sqlite3
import zipfile
from qgis.PyQt.QtCore import QDir, QTemporaryFile, QIODevice, QByteArray, QBuffer
from . import mbutils
class DirectoryWriter:
def __init__(self, outputPath, rootDir):
self.output = outputPath
self.rootDir = rootDir
def writeTile(self, tile, image, fileFormat, quality):
path = '%s/%s/%s' % (self.rootDir, tile.z, tile.x)
dirPath = '%s/%s' % (self.output.absoluteFilePath(), path)
QDir().mkpath(dirPath)
image.save('%s/%s.%s' % (dirPath, tile.y, fileFormat.lower()), fileFormat, quality)
def finalize(self):
pass
class ZipWriter:
def __init__(self, outputPath, rootDir):
self.output = outputPath
self.rootDir = rootDir
self.zipFile = zipfile.ZipFile(self.output.absoluteFilePath(), 'w')
self.tempFile = QTemporaryFile()
self.tempFile.setAutoRemove(False)
self.tempFile.open(QIODevice.WriteOnly)
self.tempFileName = self.tempFile.fileName()
self.tempFile.close()
def writeTile(self, tile, image, fileFormat, quality):
path = '%s/%s/%s' % (self.rootDir, tile.z, tile.x)
image.save(self.tempFileName, fileFormat, quality)
tilePath = '%s/%s.%s' % (path, tile.y, fileFormat.lower())
self.zipFile.write(self.tempFileName, tilePath)
def finalize(self):
self.tempFile.close()
self.tempFile.remove()
self.zipFile.close()
class NGMArchiveWriter(ZipWriter):
def __init__(self, outputPath, rootDir):
ZipWriter.__init__(self, outputPath, "Mapnik")
self.levels = {}
self.__layerName = rootDir
def writeTile(self, tile, image, fileFormat, quality):
ZipWriter.writeTile(self, tile, image, fileFormat, quality)
level = self.levels.get(tile.z, {"x": [], "y": []})
level["x"].append(tile.x)
level["y"].append(tile.y)
self.levels[tile.z] = level
def finalize(self):
archive_info = {
"cache_size_multiply": 0,
"levels": [],
'max_level': max(self.levels.keys()),
'min_level': min(self.levels.keys()),
"name": self.__layerName,
"renderer_properties": {
"alpha": 255,
"antialias": True,
"brightness": 0,
"contrast": 1,
"dither": True,
"filterbitmap": True,
"greyscale": False,
"type": "tms_renderer"
},
"tms_type": 2,
"type": 32,
"visible": True
}
for level, coords in self.levels.items():
level_json = {
"level": level,
"bbox_maxx": max(coords["x"]),
"bbox_maxy": max(coords["y"]),
"bbox_minx": min(coords["x"]),
"bbox_miny": min(coords["y"]),
}
archive_info["levels"].append(level_json)
tempFile = QTemporaryFile()
tempFile.setAutoRemove(False)
tempFile.open(QIODevice.WriteOnly)
tempFile.write(json.dumps(archive_info))
tempFileName = tempFile.fileName()
tempFile.close()
self.zipFile.write(tempFileName, "%s.json" % self.rootDir)
ZipWriter.finalize(self)
class MBTilesWriter:
def __init__(self, outputPath, rootDir, formatext, minZoom, maxZoom, extent, compression):
self.output = outputPath
self.rootDir = rootDir
self.compression = compression
s = str(extent.xMinimum()) + ',' + str(extent.yMinimum()) + ',' + str(extent.xMaximum()) + ','+ str(extent.yMaximum())
self.connection = mbutils.mbtiles_connect(str(self.output.absoluteFilePath()), True)
self.cursor = self.connection.cursor()
mbutils.optimize_connection(self.cursor)
mbutils.mbtiles_setup(self.cursor)
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('name', rootDir))
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('description', 'Created with QTiles'))
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('format', formatext.lower()))
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('minZoom', str(minZoom)))
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('maxZoom', str(maxZoom)))
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('type', 'baselayer'))
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('version', '1.1'))
self.cursor.execute('''INSERT INTO metadata(name, value) VALUES (?, ?);''', ('bounds', s))
self.connection.commit()
def writeTile(self, tile, image, fileFormat, quality):
data = QByteArray()
buff = QBuffer(data)
image.save(buff, fileFormat, quality)
self.cursor.execute('''INSERT INTO tiles(zoom_level, tile_column, tile_row, tile_data) VALUES (?, ?, ?, ?);''', (tile.z, tile.x, tile.y, sqlite3.Binary(buff.data())))
buff.close()
def finalize(self):
mbutils.optimize_database(self.connection)
self.connection.commit()
if self.compression:
# start compression
mbutils.compression_prepare(self.cursor, self.connection)
self.cursor.execute("select count(zoom_level) from tiles")
res = self.cursor.fetchone()
total_tiles = res[0]
mbutils.compression_do(self.cursor, self.connection, total_tiles)
mbutils.compression_finalize(self.cursor)
mbutils.optimize_database(self.connection)
self.connection.commit()
# end compression
self.connection.close()
self.cursor = None