Merge pull request #39 from nanobowers/block

Block

Author: mrkn

example/ex_canvases.rb

@@ -0,0 +1,9 @@
+#!/bin/env ruby
+$LOAD_PATH << "#{__dir__}/../lib"
+require "unicode_plot"
+
+# example of line plots using different canvases
+UnicodePlot.lineplot([1, 2, 7], [9, -6, 8], title: "Default Lineplot").render
+UnicodePlot.lineplot([1, 2, 7], [9, -6, 8], title: "Ascii Lineplot", canvas: :ascii).render
+UnicodePlot.lineplot([1, 2, 7], [9, -6, 8], title: "Dot Lineplot", canvas: :dot).render
+UnicodePlot.lineplot([1, 2, 7], [9, -6, 8], title: "Block Lineplot", canvas: :block).render

lib/unicode_plot.rb

@@ -13,6 +13,7 @@
 require 'unicode_plot/lookup_canvas'
 require 'unicode_plot/ascii_canvas'
 require 'unicode_plot/dot_canvas'
+require 'unicode_plot/block_canvas'
 
 require 'unicode_plot/plot'
 require 'unicode_plot/grid_plot'

lib/unicode_plot/block_canvas.rb

@@ -0,0 +1,36 @@
+module UnicodePlot
+  # The `BlockCanvas` is also Unicode-based.
+  # It has half the resolution of the `BrailleCanvas`.
+  # In contrast to BrailleCanvas, the pixels don't
+  # have visible spacing between them.
+  # This canvas effectively turns every character
+  # into 4 pixels that can individually be manipulated
+  # using binary operations.
+  class BlockCanvas < LookupCanvas
+    X_PIXEL_PER_CHAR = 2
+    Y_PIXEL_PER_CHAR = 2
+
+    def initialize(width, height, fill_char=0, **kw)
+      super(width, height,
+            X_PIXEL_PER_CHAR,
+            Y_PIXEL_PER_CHAR,
+            fill_char,
+            **kw)
+    end
+    
+    BLOCK_SIGNS = [
+      [0b1000, 0b0010].freeze,
+      [0b0100, 0b0001].freeze
+    ].freeze
+
+    BLOCK_DECODE = [
+      -' ', -'▗', -'▖', -'▄',
+      -'▝', -'▐', -'▞', -'▟',
+      -'▘', -'▚', -'▌', -'▙',
+      -'▀', -'▜', -'▛', -'█'
+    ].freeze
+
+    def lookup_encode(x,y) ; BLOCK_SIGNS[x][y] ; end
+    def lookup_decode(x) ; BLOCK_DECODE[x] ; end
+  end
+end

lib/unicode_plot/canvas.rb

@@ -12,6 +12,8 @@ def self.create(canvas_type, width, height, **kw)
         DensityCanvas.new(width, height, **kw)
       when :dot
         DotCanvas.new(width, height, **kw)
+      when :block
+        BlockCanvas.new(width, height, **kw)
       else
         raise ArgumentError, "unknown canvas type: #{canvas_type}"
       end

test/fixtures/canvas/block_print.txt

@@ -0,0 +1,10 @@
+▛▄  ▘         ▘   ▖  ▝   ▗  ▝      ▘▗▙▞▀
+▌ ▀▄               ▖        ▗   ▗▄▞▀▘   
+▌▘  ▀▄   ▝ ▐ ▌      ▄    ▘  ▗▄▞▀▘   ▘   
+▌   ▀▀▀█▀▛▀▀▀▀▀▀▀▀▀▀▄▄▄▄▄▄▟█▙▄▄▄▙▄▄▄▝▘  
+▌▗ ▝    ▀▙          ▗▄▞▀▘   ▖   ▖▝  ▘   
+▌   ▖    ▖▀▄   ▝▗▄▞▛▘ ▗       ▖   ▖▘▝   
+▌      ▗    ▜▄▞▀▘   ▘      ▝     ▗     ▗
+▌ ▘ ▖   ▗▄▞▀▘ ▀▄    ▖        ▗▗         
+▌  ▄▗▄▞▀▘      ▘▀▄   ▝▗         ▗▝    ▝ 
+▙▙▞▀▀  ▖          ▀▄▖  ▀▘▗        ▖ ▖   

test/fixtures/canvas/block_print_nocolor.txt

@@ -0,0 +1,10 @@
+▛▄  ▘         ▘   ▖  ▝   ▗  ▝      ▘▗▙▞▀
+▌ ▀▄               ▖        ▗   ▗▄▞▀▘   
+▌▘  ▀▄   ▝ ▐ ▌      ▄    ▘  ▗▄▞▀▘   ▘   
+▌   ▀▀▀█▀▛▀▀▀▀▀▀▀▀▀▀▄▄▄▄▄▄▟█▙▄▄▄▙▄▄▄▝▘  
+▌▗ ▝    ▀▙          ▗▄▞▀▘   ▖   ▖▝  ▘   
+▌   ▖    ▖▀▄   ▝▗▄▞▛▘ ▗       ▖   ▖▘▝   
+▌      ▗    ▜▄▞▀▘   ▘      ▝     ▗     ▗
+▌ ▘ ▖   ▗▄▞▀▘ ▀▄    ▖        ▗▗         
+▌  ▄▗▄▞▀▘      ▘▀▄   ▝▗         ▗▝    ▝ 
+▙▙▞▀▀  ▖          ▀▄▖  ▀▘▗        ▖ ▖   

test/fixtures/canvas/block_printrow.txt

@@ -0,0 +1 @@
+▌▘  ▀▄   ▝ ▐ ▌      ▄    ▘  ▗▄▞▀▘   ▘   

test/fixtures/canvas/block_show.txt

@@ -0,0 +1,12 @@
+┌────────────────────────────────────────┐
+│▛▄  ▘         ▘   ▖  ▝   ▗  ▝      ▘▗▙▞▀│
+│▌ ▀▄               ▖        ▗   ▗▄▞▀▘   │
+│▌▘  ▀▄   ▝ ▐ ▌      ▄    ▘  ▗▄▞▀▘   ▘   │
+│▌   ▀▀▀█▀▛▀▀▀▀▀▀▀▀▀▀▄▄▄▄▄▄▟█▙▄▄▄▙▄▄▄▝▘  │
+│▌▗ ▝    ▀▙          ▗▄▞▀▘   ▖   ▖▝  ▘   │
+│▌   ▖    ▖▀▄   ▝▗▄▞▛▘ ▗       ▖   ▖▘▝   │
+│▌      ▗    ▜▄▞▀▘   ▘      ▝     ▗     ▗│
+│▌ ▘ ▖   ▗▄▞▀▘ ▀▄    ▖        ▗▗         │
+│▌  ▄▗▄▞▀▘      ▘▀▄   ▝▗         ▗▝    ▝ │
+│▙▙▞▀▀  ▖          ▀▄▖  ▀▘▗        ▖ ▖   │
+└────────────────────────────────────────┘

test/fixtures/canvas/block_show_nocolor.txt

@@ -0,0 +1,12 @@
+┌────────────────────────────────────────┐
+│▛▄  ▘         ▘   ▖  ▝   ▗  ▝      ▘▗▙▞▀│
+│▌ ▀▄               ▖        ▗   ▗▄▞▀▘   │
+│▌▘  ▀▄   ▝ ▐ ▌      ▄    ▘  ▗▄▞▀▘   ▘   │
+│▌   ▀▀▀█▀▛▀▀▀▀▀▀▀▀▀▀▄▄▄▄▄▄▟█▙▄▄▄▙▄▄▄▝▘  │
+│▌▗ ▝    ▀▙          ▗▄▞▀▘   ▖   ▖▝  ▘   │
+│▌   ▖    ▖▀▄   ▝▗▄▞▛▘ ▗       ▖   ▖▘▝   │
+│▌      ▗    ▜▄▞▀▘   ▘      ▝     ▗     ▗│
+│▌ ▘ ▖   ▗▄▞▀▘ ▀▄    ▖        ▗▗         │
+│▌  ▄▗▄▞▀▘      ▘▀▄   ▝▗         ▗▝    ▝ │
+│▙▙▞▀▀  ▖          ▀▄▖  ▀▘▗        ▖ ▖   │
+└────────────────────────────────────────┘

test/test-canvas.rb

@@ -6,7 +6,8 @@ module CanvasTestCases
     ascii: UnicodePlot::AsciiCanvas,
     braille: UnicodePlot::BrailleCanvas,
     density: UnicodePlot::DensityCanvas,
-    dot: UnicodePlot::DotCanvas
+    dot: UnicodePlot::DotCanvas,
+    block: UnicodePlot::BlockCanvas
   }.freeze
 
   def self.included(mod)
@@ -136,3 +137,9 @@ class DotCanvasTest < Test::Unit::TestCase
 
   include CanvasTestCases
 end
+
+class BlockCanvasTest < Test::Unit::TestCase
+  CANVAS_NAME = :block
+
+  include CanvasTestCases
+end