Class: IRB2025Mikan::Canvas

Inherits:
Object
  • Object
show all
Defined in:
lib/irb/theme/rk2025.rb

Constant Summary collapse

CHARS = 
' ▘▝▀▖▌▞▛▗▚▐▜▄▙▟█'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(w, h) ⇒ Canvas

Returns a new instance of Canvas.



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# File 'lib/irb/theme/rk2025.rb', line 7

def initialize(w, h)
  @w = w
  @h = h
  clear
  # TODO: delete this
  @lines = (@h/2).times.map do
    rand(2..40).times.map{rand(33..126).chr}.join
  end
  @focus_line = rand(@lines.size)
end

Instance Attribute Details

#colors ⇒ Object (readonly)

Returns the value of attribute colors.



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# File 'lib/irb/theme/rk2025.rb', line 5

def colors
  @colors
end

#focus_line ⇒ Object

Returns the value of attribute focus_line.



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# File 'lib/irb/theme/rk2025.rb', line 6

def focus_line
  @focus_line
end

#h ⇒ Object (readonly)

Returns the value of attribute h.



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# File 'lib/irb/theme/rk2025.rb', line 5

def h
  @h
end

#lines ⇒ Object

Returns the value of attribute lines.



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# File 'lib/irb/theme/rk2025.rb', line 6

def lines
  @lines
end

#masks ⇒ Object (readonly)

Returns the value of attribute masks.



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# File 'lib/irb/theme/rk2025.rb', line 5

def masks
  @masks
end

#w ⇒ Object (readonly)

Returns the value of attribute w.



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# File 'lib/irb/theme/rk2025.rb', line 5

def w
  @w
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/irb/theme/rk2025.rb', line 18

def clear
  @masks = @h.times.map{[]}
  @colors = @h.times.map{[]}
end

#draw(cx, cy, r, color) ⇒ Object 



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# File 'lib/irb/theme/rk2025.rb', line 80

def draw(cx, cy, r, color)
  offset = 2
  plot = ->x, y, v, color {
    val = @masks[y/2][x/2] || 0
    bit = 1 << (y % 2 * 2 + x % 2)
    @masks[y/2][x/2] = (val & ~bit) | (v * bit)
    @colors[y/2][x/2] = color if color
  }
  xrange = ([2 * (cx - r - offset), 0].max.ceil..[2 * (cx + r + offset), 2 * @w - 1].min)
  yrange = ([2 * cy - r - offset, 0].max.ceil..[2 * cy + r + offset, 2 * @h - 1].min)
  yrange.each do |iy|
    xrange.each do |ix|
      x = ix - 2 * cx
      y = (iy - 2 * cy) * 2.0
      r2 = x ** 2 + y ** 2
      next if r2 > 4 * (r + offset)**2
      if r2 > 4 * (r + 0.5) ** 2
        plot[ix, iy, 0, nil]
      else
        plot[ix, iy, yield(x / 2.0 / r, y / 2.0 / r) ? 1 : 0, color]
      end
    end
  end
end

#render_to_lines ⇒ Object 



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# File 'lib/irb/theme/rk2025.rb', line 23

def render_to_lines
  output_lines = []
  @h.times do |y|
    color = nil
    default_background = 16+36*5+6*5+4
    text_color = 16+36*0+6*2+0
    line = @lines[y]
    if y == @focus_line
      default_background = 16+36*5+6*5+3
      line = line.sub('  ', '🍊')
      text_color = "#{16+36*0+6*1+0};1"
    end 
    output = +''
    background = color = nil
    x = 0
    chars = line ? line.grapheme_clusters.flat_map { |c|
      case Reline::Unicode.get_mbchar_width(c)
      when 2
        [[c, 2], :skip]
      when 1
        [[c, 1]]
      else
        []
      end
    } : []
    while x < @w do
      m = @masks[y][x] || 0
      c, cw = chars[x]
      if c == :skip
        x += 1
        next
      end
      c = nil if c == ' '

      col = @colors[y][x]
      bg = default_background
      if c && x + cw <= @w
        bg = m == 0 ? default_background : col || default_background
        col = text_color
        x += cw
      else
        x += 1
      end
      if color != col
        output << "\e[38;5;#{color = col}m"
      end
      if background != bg
        output << "\e[48;5;#{background = bg}m"
      end
      output << (c || CHARS[m])
    end
    output << "\e[m"
    output_lines << output
  end
  output_lines
end