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QGIS/python/plugins/processing/algs/qgis/TilesXYZ.py
Martin Varga f4e11bf7d5 [processing] tiles_xyz: maximize map preview
2019-06-07 11:09:41 +02:00

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# -*- coding: utf-8 -*-
"""
***************************************************************************
TilesXYZ.py
---------------------
Date : April 2019
Copyright : (C) 2019 by Lutra Consulting Limited
Email : marcel.dancak@lutraconsulting.co.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. *
* *
***************************************************************************
"""
__author__ = 'Marcel Dancak'
__date__ = 'April 2019'
__copyright__ = '(C) 2019 by Lutra Consulting Limited'
import os
import math
from uuid import uuid4
import gdal
import sqlite3
from qgis.PyQt.QtCore import QSize, Qt, QByteArray, QBuffer
from qgis.PyQt.QtGui import QColor, QImage, QPainter
from qgis.core import (QgsProcessingException,
QgsProcessingParameterEnum,
QgsProcessingParameterNumber,
QgsProcessingParameterBoolean,
QgsProcessingParameterString,
QgsProcessingParameterExtent,
QgsProcessingOutputFile,
QgsProcessingParameterFileDestination,
QgsProcessingParameterFolderDestination,
QgsGeometry,
QgsRectangle,
QgsMapSettings,
QgsCoordinateTransform,
QgsCoordinateReferenceSystem,
QgsMapRendererCustomPainterJob,
QgsLabelingEngineSettings)
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
# TMS functions taken from https://alastaira.wordpress.com/2011/07/06/converting-tms-tile-coordinates-to-googlebingosm-tile-coordinates/ #spellok
def tms(ytile, zoom):
n = 2.0 ** zoom
ytile = n - ytile - 1
return int(ytile)
# Math functions taken from https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames #spellok
def deg2num(lat_deg, lon_deg, zoom):
lat_rad = math.radians(lat_deg)
n = 2.0 ** zoom
xtile = int((lon_deg + 180.0) / 360.0 * n)
ytile = int((1.0 - math.log(math.tan(lat_rad) + (1 / math.cos(lat_rad))) / math.pi) / 2.0 * n)
return (xtile, ytile)
# Math functions taken from https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames #spellok
def num2deg(xtile, ytile, zoom):
n = 2.0 ** zoom
lon_deg = xtile / n * 360.0 - 180.0
lat_rad = math.atan(math.sinh(math.pi * (1 - 2 * ytile / n)))
lat_deg = math.degrees(lat_rad)
return (lat_deg, lon_deg)
class Tile:
def __init__(self, x, y, z):
self.x = x
self.y = y
self.z = z
def extent(self):
lat1, lon1 = num2deg(self.x, self.y, self.z)
lat2, lon2 = num2deg(self.x + 1, self.y + 1, self.z)
return [lon1, lat2, lon2, lat1]
class MetaTile:
def __init__(self):
# list of tuple(row index, column index, Tile)
self.tiles = []
def add_tile(self, row, column, tile):
self.tiles.append((row, column, tile))
def rows(self):
return max([r for r, _, _ in self.tiles]) + 1
def columns(self):
return max([c for _, c, _ in self.tiles]) + 1
def extent(self):
_, _, first = self.tiles[0]
_, _, last = self.tiles[-1]
lat1, lon1 = num2deg(first.x, first.y, first.z)
lat2, lon2 = num2deg(last.x + 1, last.y + 1, first.z)
return [lon1, lat2, lon2, lat1]
def get_metatiles(extent, zoom, size=4):
west_edge, south_edge, east_edge, north_edge = extent
left_tile, top_tile = deg2num(north_edge, west_edge, zoom)
right_tile, bottom_tile = deg2num(south_edge, east_edge, zoom)
metatiles = {}
for i, x in enumerate(range(left_tile, right_tile + 1)):
for j, y in enumerate(range(top_tile, bottom_tile + 1)):
meta_key = '{}:{}'.format(int(i / size), int(j / size))
if meta_key not in metatiles:
metatiles[meta_key] = MetaTile()
metatile = metatiles[meta_key]
metatile.add_tile(i % size, j % size, Tile(x, y, zoom))
return list(metatiles.values())
class TilesXYZAlgorithmBase(QgisAlgorithm):
EXTENT = 'EXTENT'
ZOOM_MIN = 'ZOOM_MIN'
ZOOM_MAX = 'ZOOM_MAX'
DPI = 'DPI'
TILE_FORMAT = 'TILE_FORMAT'
QUALITY = 'QUALITY'
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterExtent(self.EXTENT, self.tr('Extent')))
self.addParameter(QgsProcessingParameterNumber(self.ZOOM_MIN,
self.tr('Minimum zoom'),
minValue=0,
maxValue=25,
defaultValue=12))
self.addParameter(QgsProcessingParameterNumber(self.ZOOM_MAX,
self.tr('Maximum zoom'),
minValue=0,
maxValue=25,
defaultValue=12))
self.addParameter(QgsProcessingParameterNumber(self.DPI,
self.tr('DPI'),
minValue=48,
maxValue=600,
defaultValue=96))
self.formats = ['PNG', 'JPG']
self.addParameter(QgsProcessingParameterEnum(self.TILE_FORMAT,
self.tr('Tile format'),
self.formats,
defaultValue=0))
self.addParameter(QgsProcessingParameterNumber(self.QUALITY,
self.tr('Quality (JPG only)'),
minValue=1,
maxValue=100,
defaultValue=75))
def prepareAlgorithm(self, parameters, context, feedback):
project = context.project()
visible_layers = [item.layer() for item in project.layerTreeRoot().findLayers() if item.isVisible()]
self.layers = [l for l in project.layerTreeRoot().layerOrder() if l in visible_layers]
return True
def generate(self, writer, parameters, context, feedback):
feedback.setProgress(1)
extent = self.parameterAsExtent(parameters, self.EXTENT, context)
self.min_zoom = self.parameterAsInt(parameters, self.ZOOM_MIN, context)
self.max_zoom = self.parameterAsInt(parameters, self.ZOOM_MAX, context)
dpi = self.parameterAsInt(parameters, self.DPI, context)
self.tile_format = self.formats[self.parameterAsEnum(parameters, self.TILE_FORMAT, context)]
quality = self.parameterAsInt(parameters, self.QUALITY, context)
try:
tile_width = self.parameterAsInt(parameters, self.TILE_WIDTH, context)
tile_height = self.parameterAsInt(parameters, self.TILE_HEIGHT, context)
except AttributeError:
tile_width = 256
tile_height = 256
wgs_crs = QgsCoordinateReferenceSystem('EPSG:4326')
dest_crs = QgsCoordinateReferenceSystem('EPSG:3857')
project = context.project()
src_to_wgs = QgsCoordinateTransform(project.crs(), wgs_crs, context.transformContext())
wgs_to_dest = QgsCoordinateTransform(wgs_crs, dest_crs, context.transformContext())
settings = QgsMapSettings()
settings.setOutputImageFormat(QImage.Format_ARGB32_Premultiplied)
settings.setDestinationCrs(dest_crs)
settings.setLayers(self.layers)
settings.setOutputDpi(dpi)
if self.tile_format == 'PNG':
settings.setBackgroundColor(QColor(Qt.transparent))
# disable partial labels (they would be cut at the edge of tiles)
labeling_engine_settings = settings.labelingEngineSettings()
labeling_engine_settings.setFlag(QgsLabelingEngineSettings.UsePartialCandidates, False)
settings.setLabelingEngineSettings(labeling_engine_settings)
self.wgs_extent = src_to_wgs.transformBoundingBox(extent)
self.wgs_extent = [self.wgs_extent.xMinimum(), self.wgs_extent.yMinimum(), self.wgs_extent.xMaximum(),
self.wgs_extent.yMaximum()]
metatiles_by_zoom = {}
metatiles_count = 0
for zoom in range(self.min_zoom, self.max_zoom + 1):
metatiles = get_metatiles(self.wgs_extent, zoom, 4)
metatiles_by_zoom[zoom] = metatiles
metatiles_count += len(metatiles)
lab_buffer_px = 100
progress = 0
tile_params = {
'format': self.tile_format,
'quality': quality,
'width': tile_width,
'height': tile_height,
'min_zoom': self.min_zoom,
'max_zoom': self.max_zoom,
'extent': self.wgs_extent,
}
writer.set_parameters(tile_params)
for zoom in range(self.min_zoom, self.max_zoom + 1):
feedback.pushConsoleInfo('Generating tiles for zoom level: %s' % zoom)
for i, metatile in enumerate(metatiles_by_zoom[zoom]):
if feedback.isCanceled():
break
size = QSize(tile_width * metatile.rows(), tile_height * metatile.columns())
extent = QgsRectangle(*metatile.extent())
settings.setExtent(wgs_to_dest.transformBoundingBox(extent))
settings.setOutputSize(size)
image = QImage(size, QImage.Format_ARGB32_Premultiplied)
image.fill(Qt.transparent)
dpm = settings.outputDpi() / 25.4 * 1000
image.setDotsPerMeterX(dpm)
image.setDotsPerMeterY(dpm)
painter = QPainter(image)
job = QgsMapRendererCustomPainterJob(settings, painter)
job.renderSynchronously()
painter.end()
# For analysing metatiles (labels, etc.)
# metatile_dir = os.path.join(output_dir, str(zoom))
# os.makedirs(metatile_dir, exist_ok=True)
# image.save(os.path.join(metatile_dir, 'metatile_%s.png' % i))
for r, c, tile in metatile.tiles:
tile_img = image.copy(tile_width * r, tile_height * c, tile_width, tile_height)
writer.write_tile(tile, tile_img)
progress += 1
feedback.setProgress(100 * (progress / metatiles_count))
writer.close()
def checkParameterValues(self, parameters, context):
min_zoom = self.parameterAsInt(parameters, self.ZOOM_MIN, context)
max_zoom = self.parameterAsInt(parameters, self.ZOOM_MAX, context)
if max_zoom < min_zoom:
return False, self.tr('Invalid zoom levels range.')
return super().checkParameterValues(parameters, context)
########################################################################
# MBTiles
########################################################################
class MBTilesWriter:
def __init__(self, filename):
base_dir = os.path.dirname(filename)
os.makedirs(base_dir, exist_ok=True)
self.filename = filename
def set_parameters(self, tile_params):
self.extent = tile_params.get('extent')
self.tile_width = tile_params.get('width', 256)
self.tile_height = tile_params.get('height', 256)
self.min_zoom = tile_params.get('min_zoom')
self.max_zoom = tile_params.get('max_zoom')
tile_format = tile_params['format']
options = []
if tile_format == 'JPG':
tile_format = 'JPEG'
options = ['QUALITY=%s' % tile_params.get('quality', 75)]
driver = gdal.GetDriverByName('MBTiles')
ds = driver.Create(self.filename, 1, 1, 1, options=['TILE_FORMAT=%s' % tile_format] + options)
ds = None
self._execute_sqlite(
"INSERT INTO metadata(name, value) VALUES ('{}', '{}');".format('minzoom', self.min_zoom),
"INSERT INTO metadata(name, value) VALUES ('{}', '{}');".format('maxzoom', self.max_zoom),
# will be set properly after writing all tiles
"INSERT INTO metadata(name, value) VALUES ('{}', '');".format('bounds')
)
self._zoom = None
def _execute_sqlite(self, *commands):
conn = sqlite3.connect(self.filename)
for cmd in commands:
conn.execute(cmd)
conn.commit()
conn.close()
def _init_zoom_layer(self, zoom):
self._zoom_ds = None
west_edge, south_edge, east_edge, north_edge = self.extent
first_tile = Tile(*deg2num(north_edge, west_edge, zoom), zoom)
last_tile = Tile(*deg2num(south_edge, east_edge, zoom), zoom)
first_tile_extent = first_tile.extent()
last_tile_extent = last_tile.extent()
zoom_extent = [
first_tile_extent[0],
last_tile_extent[1],
last_tile_extent[2],
first_tile_extent[3]
]
bounds = ','.join(map(str, zoom_extent))
self._execute_sqlite("UPDATE metadata SET value='{}' WHERE name='bounds'".format(bounds))
self._zoom_ds = gdal.OpenEx(self.filename, 1, open_options=['ZOOM_LEVEL=%s' % first_tile.z])
self._first_tile = first_tile
self._zoom = zoom
def write_tile(self, tile, image):
if tile.z != self._zoom:
self._init_zoom_layer(tile.z)
data = QByteArray()
buff = QBuffer(data)
image.save(buff, 'PNG')
mmap_name = '/vsimem/' + uuid4().hex
gdal.FileFromMemBuffer(mmap_name, data.data())
gdal_dataset = gdal.Open(mmap_name)
data = gdal_dataset.ReadRaster(0, 0, self.tile_width, self.tile_height)
gdal_dataset = None
gdal.Unlink(mmap_name)
xoff = (tile.x - self._first_tile.x) * self.tile_width
yoff = (tile.y - self._first_tile.y) * self.tile_height
self._zoom_ds.WriteRaster(xoff, yoff, self.tile_width, self.tile_height, data)
def close(self):
self._zoom_ds = None
bounds = ','.join(map(str, self.extent))
self._execute_sqlite("UPDATE metadata SET value='{}' WHERE name='bounds'".format(bounds))
class TilesXYZAlgorithmMBTiles(TilesXYZAlgorithmBase):
OUTPUT_FILE = 'OUTPUT_FILE'
def initAlgorithm(self, config=None):
super(TilesXYZAlgorithmMBTiles, self).initAlgorithm()
self.addParameter(QgsProcessingParameterFileDestination(self.OUTPUT_FILE,
self.tr('Output file (for MBTiles)'),
self.tr('MBTiles files (*.mbtiles)'),
optional=True))
def name(self):
return 'tilesxyzmbtiles'
def displayName(self):
return self.tr('Generate XYZ tiles (MBTiles)')
def group(self):
return self.tr('Raster tools')
def groupId(self):
return 'rastertools'
def processAlgorithm(self, parameters, context, feedback):
output_file = self.parameterAsString(parameters, self.OUTPUT_FILE, context)
if not output_file:
raise QgsProcessingException(self.tr('You need to specify output filename.'))
writer = MBTilesWriter(output_file)
self.generate(writer, parameters, context, feedback)
results = {'OUTPUT_FILE': output_file}
return results
########################################################################
# Directory
########################################################################
LEAFLET_TEMPLATE = '''
<!DOCTYPE html>
<html>
<head>
<title>{tilesetname}</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css"
integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
crossorigin=""/>
<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js"
integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og=="
crossorigin=""></script>
<style type="text/css">
body {{
margin: 0;
padding: 0;
}}
html, body, #map{{
width: 100%;
height: 100%;
}}
</style>
</head>
<body>
<div id="map"></div>
<script>
var map = L.map('map').setView([{centery}, {centerx}], {avgzoom});
L.tileLayer({tilesource}, {{
minZoom: {minzoom},
maxZoom: {maxzoom},
tms: {tms},
attribution: 'Generated by TilesXYZ'
}}).addTo(map);
</script>
</body>
</html>
'''
class DirectoryWriter:
def __init__(self, folder, is_tms):
self.folder = folder
self.is_tms = is_tms
def set_parameters(self, tile_params):
self.format = tile_params.get('format', 'PNG')
self.quality = tile_params.get('quality', -1)
def write_tile(self, tile, image):
directory = os.path.join(self.folder, str(tile.z), str(tile.x))
os.makedirs(directory, exist_ok=True)
ytile = tile.y
if self.is_tms:
ytile = tms(ytile, tile.z)
path = os.path.join(directory, '{}.{}'.format(ytile, self.format.lower()))
image.save(path, self.format, self.quality)
return path
def close(self):
pass
class TilesXYZAlgorithmDirectory(TilesXYZAlgorithmBase):
TMS_CONVENTION = 'TMS_CONVENTION'
OUTPUT_DIRECTORY = 'OUTPUT_DIRECTORY'
OUTPUT_HTML = 'OUTPUT_HTML'
TILE_WIDTH = 'TILE_WIDTH'
TILE_HEIGHT = 'TILE_HEIGHT'
def initAlgorithm(self, config=None):
super(TilesXYZAlgorithmDirectory, self).initAlgorithm()
self.addParameter(QgsProcessingParameterNumber(self.TILE_WIDTH,
self.tr('Tile width'),
minValue=1,
maxValue=4096,
defaultValue=256))
self.addParameter(QgsProcessingParameterNumber(self.TILE_HEIGHT,
self.tr('Tile height'),
minValue=1,
maxValue=4096,
defaultValue=256))
self.addParameter(QgsProcessingParameterBoolean(self.TMS_CONVENTION,
self.tr('Use inverted tile Y axis (TMS convention)'),
defaultValue=False,
optional=True))
self.addParameter(QgsProcessingParameterFolderDestination(self.OUTPUT_DIRECTORY,
self.tr('Output directory'),
optional=True))
self.addParameter(QgsProcessingParameterFileDestination(self.OUTPUT_HTML,
self.tr('Output html (Leaflet)'),
self.tr('HTML files (*.html)'),
optional=True))
def name(self):
return 'tilesxyzdirectory'
def displayName(self):
return self.tr('Generate XYZ tiles (Directory)')
def group(self):
return self.tr('Raster tools')
def groupId(self):
return 'rastertools'
def processAlgorithm(self, parameters, context, feedback):
is_tms = self.parameterAsBoolean(parameters, self.TMS_CONVENTION, context)
output_html = self.parameterAsString(parameters, self.OUTPUT_HTML, context)
output_dir = self.parameterAsString(parameters, self.OUTPUT_DIRECTORY, context)
if not output_dir:
raise QgsProcessingException(self.tr('You need to specify output directory.'))
writer = DirectoryWriter(output_dir, is_tms)
self.generate(writer, parameters, context, feedback)
results = {'OUTPUT_DIRECTORY': output_dir}
if output_html:
output_dir_safe = output_dir.replace('\\', '/')
html_code = LEAFLET_TEMPLATE.format(
tilesetname="Leaflet Preview",
centerx=self.wgs_extent[0] + (self.wgs_extent[2] - self.wgs_extent[0]) / 2,
centery=self.wgs_extent[1] + (self.wgs_extent[3] - self.wgs_extent[1]) / 2,
avgzoom=(self.max_zoom + self.min_zoom) / 2,
tilesource="'file:///{}/{{z}}/{{x}}/{{y}}.{}'".format(output_dir_safe, self.tile_format.lower()),
minzoom=self.min_zoom,
maxzoom=self.max_zoom,
tms='true' if is_tms else 'false'
)
with open(output_html, "w") as fh:
fh.write(html_code)
results['OUTPUT_HTML'] = output_html
return results
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