Class: RPiet::Image::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/rpiet/image/image.rb

Overview

Abstract base class for all image providers. Image providers only need to implement raw_pixel, raw_width, and raw_height.

Direct Known Subclasses

AsciiImage, URLImage

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(codel_size) ⇒ Image

Returns a new instance of Image.



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# File 'lib/rpiet/image/image.rb', line 12

def initialize(codel_size)
  @codel_size = codel_size
end

Instance Attribute Details

#codel_size ⇒ Object (readonly)

Returns the value of attribute codel_size.



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# File 'lib/rpiet/image/image.rb', line 10

def codel_size
  @codel_size
end

Instance Method Details

#ascii(group = []) ⇒ Object 



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# File 'lib/rpiet/image/image.rb', line 25

def ascii(group = [])
  s = ''
  w, h = size
  h.times do |j|
    w.times do |i|
      value = pixel(i, j).to_initial 
      s << (group.include?([i, j]) ? value.upcase : value) << ' '
    end
    s << "\n"
  end
  s
end

#color_for(rgb_hex) ⇒ Object 



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# File 'lib/rpiet/image/image.rb', line 21

def color_for(rgb_hex)
  RPiet::Color::RGB[rgb_hex]
end

#pixel(x, y) ⇒ Object 



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# File 'lib/rpiet/image/image.rb', line 16

def pixel(x, y)
  r,g,b = raw_pixel(x * @codel_size, y * @codel_size)
  color_for(format "0x%02x%02x%02x" % [r,g,b])
end

#size ⇒ Object 



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# File 'lib/rpiet/image/image.rb', line 38

def size
  [raw_width/@codel_size, raw_height/@codel_size]
end