Class: Drawille::Canvas

Inherits:
Object
  • Object
show all
Includes:
Frameable
Defined in:
lib/drawille/canvas.rb

Constant Summary

Constants included from Frameable

Frameable::BRAILLE_CHAR_OFFSET, Frameable::PIXEL_MAP

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Frameable

#char, #frame, #row, #rows, #to_braille

Constructor Details

#initialize ⇒ Canvas

Returns a new instance of Canvas.



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# File 'lib/drawille/canvas.rb', line 9

def initialize 
  clear
  @snapshots = [{}]
end

Instance Attribute Details

#chars ⇒ Object (readonly)

Returns the value of attribute chars.



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# File 'lib/drawille/canvas.rb', line 7

def chars
  @chars
end

Instance Method Details

#[]=(x, y, bool) ⇒ Object 



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# File 'lib/drawille/canvas.rb', line 38

def []= x, y, bool
  bool ? set(x, y) : unset(x, y)
end

#clear ⇒ Object 



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# File 'lib/drawille/canvas.rb', line 19

def clear
  @chars = Hash.new { |h,v| h[v] = Hash.new(0) }
end

#convert(x, y) ⇒ Object 



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# File 'lib/drawille/canvas.rb', line 49

def convert x, y
  x = x.round
  y = y.round
  [x, y, (x / 2).floor, (y / 4).floor]
end

#get(x, y) ⇒ Object Also known as: [] 



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# File 'lib/drawille/canvas.rb', line 33

def get x, y
  x, y, px, py = convert x, y
  @chars[py][px] & PIXEL_MAP[y % 4][x % 2] != 0
end

#paint(&block) ⇒ Object 



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# File 'lib/drawille/canvas.rb', line 14

def paint &block
  Brush.new(self).instance_eval(&block)
  self
end

#set(x, y) ⇒ Object 



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# File 'lib/drawille/canvas.rb', line 23

def set x, y
  x, y, px, py = convert x, y
  @chars[py][px] |= PIXEL_MAP[y % 4][x % 2]
end

#toggle(x, y) ⇒ Object 



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# File 'lib/drawille/canvas.rb', line 44

def toggle x, y
  x, y, px, py = convert x, y
  @chars[py][px] & PIXEL_MAP[y % 4][x % 2] == 0 ? set(x, y) : unset(x, y) 
end

#unset(x, y) ⇒ Object 



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# File 'lib/drawille/canvas.rb', line 28

def unset x, y
  x, y, px, py = convert x, y
  @chars[py][px] &= ~PIXEL_MAP[y % 4][x % 2]
end