🐃 working on own BrailleBuffer implementation

src/BrailleBuffer.coffee

@@ -0,0 +1,78 @@
+###
+  termap - Terminal Map Viewer
+  by Michael Strassburger <codepoet@cpan.org>
+
+  Simple pixel to barille character mapper
+
+  Implementation inspired by node-drawille (https://github.com/madbence/node-drawille)
+  * added written text support
+  * added color 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
+###
+
+module.exports = class BrailleBuffer
+  characterMap: [[0x1, 0x8],[0x2, 0x10],[0x4, 0x20],[0x40, 0x80]]
+
+  pixelBuffer: null
+  charBuffer: null
+  colorBuffer: null
+
+  constructor: (@width, @height) ->
+    @pixelBuffer = new Buffer @width*@height/8
+    @clear()
+
+  clear: ->
+    @pixelBuffer.fill 0
+    @charBuffer = []
+    @colorBuffer = []
+
+  setPixel: (x, y, color) ->
+    @_locate x, y, (idx, mask) =>
+      @pixelBuffer[idx] |= mask
+      @colorBuffer[(x>>1)+(y*@height<<2)] = @termColor color
+
+  unsetPixel: (x, y) ->
+    @_locate x, y, (idx, mask) =>
+      @pixelBuffer[idx] &= ~mask
+
+  _locate: (x, y, cb) ->
+    return unless 0 <= x < @width and 0 <= y < @height
+    idx = (x>>1) + (@width>>1)*(y>>2)
+    mask = @characterMap[y&3][x&1]
+    cb idx, mask
+
+  frame: ->
+    output = []
+    delimeter = "\n"
+    color = null
+
+    for idx in [0...@pixelBuffer.length]
+      output.push delimeter unless idx % (@width/2)
+
+      if @charBuffer[idx]
+        output.push @charBuffer[idx]
+      else if @pixelBuffer[idx] is 0
+        output.push ' '
+      else
+        output.push color = colorCode if color isnt colorCode = @colorBuffer[idx] or "\x1B[39m"
+        output.push String.fromCharCode 0x2800+@pixelBuffer[idx]
+
+    output.push "\x1B[39m"+delimeter
+    output.join ''
+
+  termColor: (color) ->
+    "\x1B[38;5;#{color}m"
+
+  setChar: (char, color, x, y) ->
+    return unless 0 <= x < @width/2 and 0 <= y < @height/4
+    idx = x+y*@width/2
+    @charBuffer[idx] = char
+    @colorBuffer[idx] = color
+
+buffer = new BrailleBuffer 100, 16
+for i in [0...100]
+  buffer.setPixel i, 8+8*Math.cos(i/10*Math.PI/2), i>>2
+console.log buffer.frame()

src/Renderer.coffee

@@ -113,13 +113,13 @@ module.exports = class Renderer
     unless style = @styler.getStyleFor layer, feature, 14
       return false
 
-    color = style.paint['line-color'] or style.paint['fill-color'] or style.paint['text-color']
-
     toDraw = for points in feature.points
       for point in points
         x: point.x/scale
         y: point.y/scale
 
+    color = style.paint['line-color'] or style.paint['fill-color'] or style.paint['text-color']
+
     # TODO: zoom calculation todo for perfect styling
     if color instanceof Object
       color = color.stops[0][1]

src/Termap.coffee

@@ -65,8 +65,8 @@ module.exports = class Termap
     @zoom = Math.log(4096/@width)/Math.LN2
 
   _resizeRenderer: (cb) ->
-    @width = Math.floor((process.stdout.columns-1)/2)*2*2
-    @height = Math.ceil(process.stdout.rows/4)*4*4
+    @width = (process.stdout.columns-1) >> 1 << 2
+    @height = process.stdout.rows >> 2 << 4
 
     @renderer.setSize @width, @height