Merge pull request #20 from rastapasta/ascii

Braille-less ASCII mode, using ▀ ▄ █ ▌▐ ■

src/BrailleBuffer.coffee

@@ -6,24 +6,35 @@
 
   Implementation inspired by node-drawille (https://github.com/madbence/node-drawille)
   * added color support
-  * added support for filled polygons
   * added text label support
   * general optimizations
-    -> more bit shifting/operations, less Math.floors
 
   Will either be merged into node-drawille or become an own module at some point
 ###
 stringWidth = require 'string-width'
 config = require './config'
+utils = require './utils'
 
 module.exports = class BrailleBuffer
-  characterMap: [[0x1, 0x8],[0x2, 0x10],[0x4, 0x20],[0x40, 0x80]]
+  brailleMap: [[0x1, 0x8],[0x2, 0x10],[0x4, 0x20],[0x40, 0x80]]
+  asciiMap:
+    # "▬": [2+32, 4+64]
+    # "¯": [1+16]
+    "▀": [1+2+16+32]
+    "▄": [4+8+64+128]
+    "■": [2+4+32+64]
+    "▌": [1+2+4+8]
+    "▐": [16+32+64+128]
+    # "▓": [1+4+32+128, 2+8+16+64]
+    "█": [255]
 
   pixelBuffer: null
   charBuffer: null
   foregroundBuffer: null
   backgroundBuffer: null
 
+  asciiToBraille: []
+
   globalBackground: null
 
   termReset: "\x1B[39;49m"
@@ -33,6 +44,8 @@ module.exports = class BrailleBuffer
     @pixelBuffer = new Buffer size
     @foregroundBuffer = new Buffer size
     @backgroundBuffer = new Buffer size
+
+    @_mapBraille()
     @clear()
 
   clear: ->
@@ -63,9 +76,28 @@ module.exports = class BrailleBuffer
   _locate: (x, y, cb) ->
     return unless 0 <= x < @width and 0 <= y < @height
     idx = @_project x, y
-    mask = @characterMap[y&3][x&1]
+    mask = @brailleMap[y&3][x&1]
     cb idx, mask
 
+  _mapBraille: ->
+    @asciiToBraille = [" "]
+
+    masks = []
+    for char, bits of @asciiMap
+      continue unless bits instanceof Array
+      masks.push mask: mask, char: char for mask in bits
+
+    for i in [1..255]
+      braille = (i&7) + ((i&56)<<1) + ((i&64)>>3) + (i&128)
+
+      @asciiToBraille[i] = masks.reduce(((best, mask) ->
+        covered = utils.population(mask.mask&braille)
+        if not best or best.covered < covered
+          char: mask.char, covered: covered
+        else
+          best
+      ), undefined).char
+
   _termColor: (foreground, background) ->
     background = background or @globalBackground
     if foreground and background
@@ -102,7 +134,10 @@ module.exports = class BrailleBuffer
             char
         else
           if not skip
+            if config.useBraille
               String.fromCharCode 0x2800+@pixelBuffer[idx]
+            else
+              @asciiToBraille[@pixelBuffer[idx]]
           else
             skip--
             ''

src/Mapscii.coffee

@@ -179,6 +179,10 @@ module.exports = class Mapscii
       when "up" then @moveBy 6/Math.pow(2, @zoom), 0
       when "down" then @moveBy -6/Math.pow(2, @zoom), 0
 
+      when "c"
+        config.useBraille = !config.useBraille
+        true
+
       else
         null
 

src/Renderer.coffee

@@ -175,9 +175,8 @@ module.exports = class Renderer
         @canvas.polygon points, feature.color
 
       when "symbol"
-        genericSymbol = null
         text = feature.label or
-          genericSymbol = "◉"
+          genericSymbol = config.poiMarker
 
         return false if @_seen[text] and not genericSymbol
 
@@ -192,8 +191,8 @@ module.exports = class Renderer
             break
 
           else if config.layers[feature.layer]?.cluster and
-          @labelBuffer.writeIfPossible "◉", point.x, point.y, feature, 3
-            @canvas.text "◉", point.x, point.y, feature.color
+          @labelBuffer.writeIfPossible config.poiMarker, point.x, point.y, feature, 3
+            @canvas.text config.poiMarker, point.x, point.y, feature.color
             placed = true
             break
 

src/config.coffee

@@ -15,6 +15,8 @@ module.exports =
 
   simplifyPolylines: false
 
+  useBraille: true
+
   # Downloaded files get persisted in ~/.mapscii
   persistDownloadedTiles: true
 
@@ -35,3 +37,5 @@ module.exports =
   headless: false
 
   delimeter: "\n\r"
+
+  poiMarker: "◉"

src/utils.coffee

@@ -64,4 +64,11 @@ utils =
 
     ll
 
+  population: (val) ->
+    bits = 0
+    while val>0
+      bits += val & 1
+      val >>= 1
+    bits
+
 module.exports = utils