🎨 MVP version of mapbox style parser

README.md

@@ -28,6 +28,7 @@ No web browser around? No worries - discover the planet in your console!
 ### Libraries
 #### Mastering the console
   * [`drawille-canvas-blessed-contrib`](https://github.com/yaronn/drawille-canvas-blessed-contrib/) for [braille](http://www.fileformat.info/info/unicode/block/braille_patterns/utf8test.htm) rendering
+  * [`x256`](https://github.com/substack/node-x256) for finding nearest xterm-256 [color codes](https://en.wikipedia.org/wiki/File:Xterm_256color_chart.svg)
   * [`term-mouse`](https://github.com/CoderPuppy/term-mouse) for mouse handling
   * [`keypress`](https://github.com/TooTallNate/keypress) for input handling
 
@@ -41,7 +42,6 @@ No web browser around? No worries - discover the planet in your console!
 * [`rbush`](https://github.com/mourner/rbush) for 2D spatial indexing based label and mouse collision detection
 * [`sphericalmercator`](https://github.com/mapbox/node-sphericalmercator) for [EPSG:3857](http://spatialreference.org/ref/sr-org/6864/) <> [WGS84](http://spatialreference.org/ref/epsg/wgs-84/) conversions
 
-
 ## Wishlist
 
 * node port of [libdrawille](https://github.com/Huulivoide/libdrawille) - well optimized library, supporting filled polygons
@@ -71,6 +71,8 @@ No web browser around? No worries - discover the planet in your console!
 * [x] start with zoom level which shows full vector tile
 * [x] accurate mouse drag&drop
 * [x] handle console resize
+* [ ] styling
+  * [ ] abstracted MapBox style JSON support
 * [ ] turn this into a [`blessed-contrib`](https://github.com/yaronn/blessed-contrib) widget
 
 ## License

package.json

@@ -28,6 +28,7 @@
     "rbush": "^2.0.1",
     "sphericalmercator": "^1.0.5",
     "term-mouse": "^0.1.1",
-    "vector-tile": "^1.3.0"
+    "vector-tile": "^1.3.0",
+    "x256": "0.0.2"
   }
 }

src/LabelBuffer.coffee

@@ -2,7 +2,7 @@ rbush = require 'rbush'
 
 module.exports = class LabelBuffer
   tree: null
-  margin: 1
+  margin: 5
 
   constructor: (@width, @height) ->
     @tree = rbush()

src/Styler.coffee

@@ -0,0 +1,92 @@
+fs = require 'fs'
+# 'text-field'
+
+# Verrrrry MVP implementation
+# TODO: should be optimized by compiling the json to method&cb based filters
+
+module.exports = class Styler
+  styleById: {}
+  styleByLayer: {}
+
+  constructor: (file) ->
+    json = JSON.parse fs.readFileSync(file).toString()
+    @styleName = json.name
+
+    for layer in json.layers
+      continue if layer.ref
+      style = layer
+
+      @styleByLayer[layer['source-layer']] ?= []
+      @styleByLayer[layer['source-layer']].push style
+
+      @styleById[layer.id] = style
+
+  getStyleFor: (layer, feature, zoom) ->
+    return false unless @styleByLayer[layer]
+
+    for style in @styleByLayer[layer]
+      return style unless style.filter
+
+      if @_passesFilter feature, style.filter
+        return style
+
+    false
+
+  _passesFilter: (feature, filter) ->
+    switch filter.shift()
+      when "all"
+        for subFilter in filter
+          return false unless @_passesFilter feature, subFilter
+        true
+
+      when "=="
+        feature.properties[filter[0]] is filter[1]
+
+      when "!="
+        feature.properties[filter[0]] isnt filter[1]
+
+      when "in"
+        field = filter.shift()
+        for value in filter
+          return true if feature.properties[field] is value
+        false
+
+      when "!in"
+        field = filter.shift()
+        for value in filter
+          return false if feature.properties[field] is value
+        true
+
+  ###
+  cleanStyle: (file) ->
+    json = JSON.parse fs.readFileSync(file).toString()
+
+    cleanedStyle =
+      name: json.name
+      layers: []
+
+    for layer in json.layers
+      continue if layer.ref
+
+      cleanLayer =
+        type: layer.type
+        id: layer.id
+        paint: {}
+        'source-layer': layer['source-layer']
+
+
+      for key in ['filter', 'minzoom']
+        cleanLayer[key] = layer[key] if layer[key]
+
+      if layer.layout?['text-size']
+        cleanLayer.layout = 'text-size': layer.layout?['text-size']
+
+      # TODO: opacity
+      for key in ['fill-color', 'line-color', 'text-color', 'background-color']
+        cleanLayer.paint[key] = layer.paint[key] if layer.paint?[key]
+
+      if Object.keys(cleanLayer.paint).length
+        cleanedStyle.layers.push cleanLayer
+
+    console.log JSON.stringify cleanedStyle, null, '  '
+  ###

termap.coffee

@@ -1,14 +1,18 @@
 Canvas = require '../drawille-canvas-blessed-contrib'
-VectorTile = require('vector-tile').VectorTile
-Protobuf = require 'pbf'
 keypress = require 'keypress'
+TermMouse = require 'term-mouse'
+x256 = require 'x256'
+Protobuf = require 'pbf'
+VectorTile = require('vector-tile').VectorTile
 fs = require 'fs'
 zlib = require 'zlib'
-TermMouse = require 'term-mouse'
+
 mercator = new (require('sphericalmercator'))()
-LabelBuffer = require __dirname+'/src/LabelBuffer'
 triangulator = new (require('pnltri')).Triangulator()
 
+LabelBuffer = require __dirname+'/src/LabelBuffer'
+Styler = require __dirname+'/src/Styler'
+
 utils =
   deg2rad: (angle) ->
     # (angle / 180) * Math.PI
@@ -16,6 +20,21 @@ utils =
   rad2deg: (angle) ->
     angle / Math.PI * 180
 
+  hex2rgb: (color) ->
+    return [255, 0, 0] unless color?.match
+
+    unless color.match /^#[a-fA-F0-9]{3,6}$/
+      throw new Error "#{color} isn\'t a supported hex color"
+
+    color = color.substr 1
+    decimal = parseInt color, 16
+
+    if color.length is 3
+      rgb = [decimal>>8, (decimal>>4)&15, decimal&15]
+      rgb.map (c) => c + (c<<4)
+    else
+      [(decimal>>16)&255, (decimal>>8)&255, decimal&255]
+
   digits: (number, digits) ->
     Math.floor(number*Math.pow(10, digits))/Math.pow(10, digits)
 
@@ -25,10 +44,13 @@ utils =
 
 class Termap
   config:
+    styleFile: __dirname+"/styles/bright.json"
+
+    fillPolygons: true
     zoomStep: 0.5
 
-    # landuse
-    drawOrder: ["admin", "water", "building", "road", "poi_label", "housenum_label"]
+    # landuse "poi_label"
+    drawOrder: ["admin", "water", "building", "road", "housenum_label"]
 
     icons:
       car: "🚗"
@@ -54,7 +76,7 @@ class Termap
         minZoom: 2
         color: 8
       building:
-        minZoom: 3.5
+        minZoom: 2.5
         color: 8
 
       poi_label:
@@ -76,6 +98,7 @@ class Termap
   height: null
   canvas: null
 
+  styler: null
   isDrawing: false
   lastDrawAt: 0
 
@@ -122,6 +145,7 @@ class Termap
       @zoom = Math.log(4096/@width)/Math.LN2
 
     @labelBuffer = new LabelBuffer()
+    @styler = new Styler @config.styleFile
 
   _onResize: (cb) ->
     process.stdout.on 'resize', cb
@@ -184,7 +208,7 @@ class Termap
       features[name] = for i in [0...layer.length]
         feature = layer.feature i
 
-        type: [undefined, "point", "line", "polygon"][feature.type]
+        type: [undefined, "Point", "LineString", "Polygon"][feature.type]
         id: feature.id
         properties: feature.properties
         points: feature.loadGeometry()
@@ -194,9 +218,12 @@ class Termap
   _draw: ->
     return if @isDrawing
     @isDrawing = true
-
     @lastDrawAt = Date.now()
 
+    # if color = @styler.styleById['background']?.paint['background-color']
+    #   @canvas.strokeStyle = x256 utils.hex2rgb(color)...
+    #   @canvas.fillRect 0, 0, @width, @height
+    # else
     @canvas.clearRect 0, 0, @width, @height
 
     @canvas.save()
@@ -225,12 +252,12 @@ class Termap
       @canvas.strokeStyle = @canvas.fillStyle = @config.layers[layer].color
 
       for feature in @features[layer]
-        if @_drawFeature feature, scale
+        if @_drawFeature layer, feature, scale
           drawn.push feature
 
     drawn
 
-  _drawFeature: (feature, scale) ->
+  _drawFeature: (layer, feature, scale) ->
     toDraw = []
     for idx, points of feature.points
       visible = false
@@ -249,17 +276,28 @@ class Termap
       continue unless visible
       toDraw.push projectedPoints
 
+    if style = @styler.getStyleFor layer, feature, 8
+      color = style.paint['line-color'] or style.paint['fill-color']
+
+      # TODO: zoom calculation todo for perfect styling
+      if color instanceof Object
+        color = color.stops[0][1]
+
+      @canvas.fillStyle = @canvas.strokeStyle = x256 utils.hex2rgb color
+    else
+      @canvas.strokeStyle = @canvas.fillStyle = @config.layers[layer].color
+
     switch feature.type
-      when "line"
+      when "LineString"
         @_drawWithLines points for points in toDraw
         true
 
-      when "polygon"
-        unless @_drawWithTriangles toDraw
+      when "Polygon"
+        unless @config.fillPolygons and @_drawWithTriangles toDraw
           @_drawWithLines points for points in toDraw
         true
 
-      when "point"
+      when "Point"
         text = feature.properties.house_num or @config.icons[feature.properties.maki] or "◉"
 
         wasDrawn = false