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#!/usr/bin/env python
#
# This file reads the layers in the layers directory
# and creates tilesets out of them.
#
# Additionaly it stores the data in a format so it's
# usable by the web frontend
#
import cairo
import json
import math
import os
import shutil
import stat
import yaml
int_ceil = lambda x : int(math.ceil(x))
def makedirs(dirs):
try:
s = os.stat(dirs)
if stat.S_ISDIR(s.st_mode):
return
except Exception:
pass
os.makedirs(dirs)
class Layer(object):
def __init__(self, info, path):
self.name = info.get('name', None)
if self.name is None:
self.name = os.path.splitext(os.path.basename(path))[0]
self._scale = info.get('scale', 1.0)
self._x_offset = info.get('x-offset', 0.0)
self._y_offset = info.get('y-offset', 0.0)
self._load_file(path)
@property
def width(self):
return self._x_offset + (self._orig_width * self._scale)
@property
def height(self):
return self._y_offset + (self._orig_height * self._scale)
def draw(self, context):
context.transform(cairo.Matrix(x0=self._x_offset, y0=self._y_offset))
context.transform(cairo.Matrix(xx=self._scale, yy=self._scale))
def _load_file(self, path):
raise NotImplementedError
def __cmp__(self, other):
return cmp(self.name, other.name)
class PdfLayer(Layer):
def _load_file(self, path):
from gi.repository import Poppler
document = Poppler.Document.new_from_file('file://{0}'.format(path), None)
self._page = document.get_page(0)
@property
def _orig_width(self):
return self._page.get_size()[0]
@property
def _orig_height(self):
return self._page.get_size()[1]
def draw(self, context):
super(PdfLayer, self).draw(context)
self._page.render(context)
class PngLayer(Layer):
def _load_file(self, path):
self._image = cairo.ImageSurface.create_from_png(path)
@property
def _orig_width(self):
return self._image.get_width()
@property
def _orig_height(self):
return self._image.get_height()
def draw(self, context):
super(PngLayer, self).draw(context)
context.set_source_surface(self._image)
context.paint()
class LayerLoader(object):
def load(self, layer_path):
layers = []
for layer_file in os.listdir(layer_path):
if layer_file.endswith('.txt'):
continue
layer_file = os.path.join(layer_path, layer_file)
layers.append(self.read(layer_file))
return layers
def read(self, path):
info_file = '{0}.txt'.format(path)
if os.path.exists(info_file):
with open(info_file, 'r') as f:
info = yaml.safe_load(f)
else:
info = {}
if path.endswith('.pdf'):
return PdfLayer(info, path)
elif path.endswith('.png'):
return PngLayer(info, path)
else:
raise RuntimeError("Unsupported Format for '{0}'".format(path))
class TileGenerator(object):
def __init__(self, layer, width=None, height=None, tile_size=None, zoom_step=None, scale=-1):
self.layer = layer
self.size = (self.layer.width if width is None else width,
self.layer.height if height is None else height)
self.tile_size = 256 if tile_size is None else tile_size
self.zoom_step = 2.0 if zoom_step is None else float(zoom_step)
self.scale = scale
self.draw_per_plane = True
def create_tiles(self, path):
# calculate how many zoom levels we need by getting the largest number with
# 2 ** max_zoom_level >= max(layer_width / tile_size, layer_height / tile_size)
max_zoom_level = max([
int_ceil(math.log(float(self.size[0]) / self.tile_size, self.zoom_step)),
int_ceil(math.log(float(self.size[1]) / self.tile_size, self.zoom_step))
])
if self.scale >= 0:
nice_size = self.tile_size * (self.zoom_step ** max_zoom_level)
prescale = float(nice_size) / self.size[self.scale]
maybe_greater_zoom_level = int_ceil(math.log(prescale * self.size[1 - self.scale]
/ self.tile_size, self.zoom_step))
if maybe_greater_zoom_level > max_zoom_level:
max_zoom_level = maybe_greater_zoom_level
else:
prescale = 1.0
self.layer.max_zoom_level = max_zoom_level
scaled_size = (self.size[0] * prescale, self.size[1] * prescale)
# Actual tile rendering starts here
tile_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, self.tile_size, self.tile_size)
tile_context = cairo.Context(tile_surface)
for zoom_level in range(max_zoom_level + 1):
zoom_factor = self.zoom_step ** -zoom_level
tiles_x = int_ceil(zoom_factor * scaled_size[0] / self.tile_size)
tiles_y = int_ceil(zoom_factor * scaled_size[1] / self.tile_size)
zoom_level_transform = cairo.Matrix(xx=prescale * zoom_factor, yy=prescale * zoom_factor)
if self.draw_per_plane:
plane_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32,
self.tile_size * tiles_x,
self.tile_size * tiles_y)
plane_context = cairo.Context(plane_surface)
plane_context.set_matrix(zoom_level_transform)
plane_context.set_source_rgba(1.0, 1.0, 1.0, 1.0)
plane_context.paint()
layer.draw(plane_context)
for x in range(tiles_x):
makedirs(os.path.join(path, str(max_zoom_level - zoom_level), str(x)))
column_transform = cairo.Matrix(x0=-self.tile_size * x) # Shift image to left for x tiles
for y in range(tiles_y):
tile_path = os.path.join(path, str(max_zoom_level - zoom_level), str(x), '{0}.png'.format(y))
tile_transform = column_transform * cairo.Matrix(y0=-self.tile_size * y) # Shift image up for y tiles
if self.draw_per_plane:
tile_context.set_matrix(tile_transform)
tile_context.set_source_surface(plane_surface)
tile_context.paint()
else:
tile_context.set_matrix(zoom_level_transform * tile_transform)
tile_context.set_source_rgba(1.0, 1.0, 1.0, 1.0)
tile_context.paint()
layer.draw(tile_context)
tile_surface.write_to_png(tile_path)
class LayerInfoStore(object):
def __init__(self, layers):
self.layers = layers
def store(self, path):
document = []
for layer in sorted(self.layers):
document.append({
'name': layer.name,
'max_zoom': layer.max_zoom_level
})
with open(path, "w") as f:
json.dump(document, f)
if __name__ == '__main__':
layer_path = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'layers')
web_path = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'web')
tiles_path = os.path.join(web_path, 'images', 'tiles')
layer_info_path = os.path.join(web_path, 'js', 'layers.json')
if os.path.exists(tiles_path):
shutil.rmtree(tiles_path)
layers = LayerLoader().load(layer_path)
layer_width = max([layer.width for layer in layers])
layer_height = max([layer.height for layer in layers])
for layer in layers:
tile_generator = TileGenerator(layer, layer_width, layer_height)
tile_generator.create_tiles(os.path.join(tiles_path, layer.name))
LayerInfoStore(layers).store(layer_info_path)
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