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###
termap - Terminal Map Viewer
by Michael Strassburger <codepoet@cpan.org>
Handling of and access to single VectorTiles
###
VectorTile = require('vector-tile').VectorTile
Protobuf = require 'pbf'
Promise = require 'bluebird'
zlib = require 'zlib'
rbush = require 'rbush'
x256 = require 'x256'
earcut = require 'earcut'
config = require "./config"
utils = require "./utils"
class Tile
layers: {}
constructor: (@styler) ->
load: (buffer) ->
@_unzipIfNeeded buffer
.then (buffer) => @_loadTile buffer
.then => @_loadLayers()
.then => this
_loadTile: (buffer) ->
@tile = new VectorTile new Protobuf buffer
_unzipIfNeeded: (buffer) ->
new Promise (resolve, reject) =>
if @_isGzipped buffer
zlib.gunzip buffer, (err, data) ->
return reject err if err
resolve data
else
resolve buffer
_isGzipped: (buffer) ->
buffer.slice(0,2).indexOf(Buffer.from([0x1f, 0x8b])) is 0
_loadLayers: () ->
layers = {}
colorCache = {}
for name, layer of @tile.layers
nodes = []
#continue if name is "water"
for i in [0...layer.length]
# TODO: caching of similar attributes to avoid looking up the style each time
#continue if @styler and not @styler.getStyleFor layer, feature
feature = layer.feature i
feature.properties.$type = type = [undefined, "Point", "LineString", "Polygon"][feature.type]
if @styler
style = @styler.getStyleFor name, feature
continue unless style
color =
style.paint['line-color'] or
style.paint['fill-color'] or
style.paint['text-color']
# TODO: style zoom stops handling
if color instanceof Object
color = color.stops[0][1]
colorCode = colorCache[color] or colorCache[color] = x256 utils.hex2rgb color
# TODO: monkey patching test case for tiles with a reduced extent 4096 / 8 -> 512
# use feature.loadGeometry() again as soon as we got a 512 extent tileset
geometries = feature.loadGeometry() #@_reduceGeometry feature, 8
sort = feature.properties.localrank or feature.properties.scalerank
label = if feature.properties.$type is "Point"
feature.properties["name_"+config.language] or
feature.properties.name_en or
feature.properties.name or
feature.properties.house_num
else
undefined
if style.type is "fill"
nodes.push @_addBoundaries true,
# id: feature.id
layer: name
style: style
label: label
sort: sort
points: geometries
color: colorCode
else
for points in geometries
nodes.push @_addBoundaries false,
# id: feature.id
layer: name
style: style
label: label
sort: sort
points: points
color: colorCode
tree = rbush 18
tree.load nodes
layers[name] =
extent: layer.extent
tree: tree
@layers = layers
_addBoundaries: (deep, data) ->
minX = Infinity
maxX = -Infinity
minY = Infinity
maxY = -Infinity
for p in (if deep then data.points[0] else data.points)
minX = p.x if p.x < minX
maxX = p.x if p.x > maxX
minY = p.y if p.y < minY
maxY = p.y if p.y > maxY
data.minX = minX
data.maxX = maxX
data.minY = minY
data.maxY = maxY
data
_reduceGeometry: (feature, factor) ->
for points, i in feature.loadGeometry()
reduced = []
last = null
for point in points
p =
x: Math.floor point.x/factor
y: Math.floor point.y/factor
if last and last.x is p.x and last.y is p.y
continue
reduced.push last = p
reduced
module.exports = Tile
|
