Class: QRTools::QRCode

Inherits:
Object
  • Object
show all
Defined in:
lib/qrtools/qrcode.rb,
ext/qrtools/qrtools_qrcode.c

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.decode(*args, &block) ⇒ Object 



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# File 'lib/qrtools/qrcode.rb', line 7

def decode *args, &block
  Decoder.decode *args, &block
end

.encode(*args, &block) ⇒ Object 



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# File 'lib/qrtools/qrcode.rb', line 11

def encode *args, &block
  Encoder.encode *args, &block
end

Instance Method Details

#data ⇒ Object 



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# File 'ext/qrtools/qrtools_qrcode.c', line 17

static VALUE data(VALUE self)
{
  QRcode * code;
  Data_Get_Struct(self, QRcode, code);

  return rb_str_new(code->data, code->width * code->width);
}

#to_matrix ⇒ Object 



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# File 'lib/qrtools/qrcode.rb', line 16

def to_matrix
  codes = []
  data.unpack("C#{width ** 2}").each_slice(width) { |row|
    codes << row.map { |x| x & 0x1 == 1 }
  }
  codes
end

#to_png(scale = 4, border = 10) ⇒ Object 



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# File 'lib/qrtools/qrcode.rb', line 30

def to_png scale = 4, border = 10
  # Add 2 extra rows / columns for white borders
  size = (width + border) * scale
  canvas = PNG::Canvas.new(size, size, PNG::Color::White)

  scaled_matrix = []
  to_matrix.each do |row|
    scaled_row = row.map { |bit|
      [bit] * scale
    }.flatten
    scaled_matrix += ([scaled_row] * scale)
  end

  factor = border / 2 * scale
  scaled_matrix.each_with_index { |row, i|
    x = i + factor
    row.each_with_index { |bit, j|
      y = j + factor
      canvas[x, y] = bit ? PNG::Color::Black : PNG::Color::White 
    }
  }
  PNG.new(canvas).to_blob
end

#to_s ⇒ Object 



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# File 'lib/qrtools/qrcode.rb', line 24

def to_s
  to_matrix.map { |row|
    row.map { |bit| bit ? '#' : ' ' }.join
  }.join("\n")
end

#version ⇒ Object 



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# File 'ext/qrtools/qrtools_qrcode.c', line 10

static VALUE version(VALUE self)
{
  QRcode * code;
  Data_Get_Struct(self, QRcode, code);
  return INT2NUM(code->version);
}

#width ⇒ Object 



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# File 'ext/qrtools/qrtools_qrcode.c', line 3

static VALUE width(VALUE self)
{
  QRcode * code;
  Data_Get_Struct(self, QRcode, code);
  return INT2NUM(code->width);
}