Module: RubyMatrixToSvg

Defined in:
lib/ruby_matrix_to_svg.rb,
lib/ruby_matrix_to_svg/version.rb

Constant Summary collapse

VERSION = 
"0.0.1"

Class Method Summary collapse

Class Method Details

.matrix_to_svg(title, matrix) ⇒ Object

generate the svg string

Example:

>> matrix_to_svg("svg_image_title" , matrix)
=> (String)

Parameters:

  • title (String) —

    the title of the svg image

  • matrix (Array[Array[(String)]]) —

    the colors matrix



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# File 'lib/ruby_matrix_to_svg.rb', line 14

def self.matrix_to_svg title, matrix

  # test if params are correct
  raise "title is invalid" if title == nil || title == ''
  raise "matrix is invalid, must be a matrix (array of arrays) of colors" if matrix.class != Array || matrix[0].class != Array
  
  # open svg tag
  num_rows = matrix.length
  num_cols = matrix[0].length

  svg = "<svg xmlns='http://www.w3.org/2000/svg' version='1.1' width='#{num_cols}' height='#{num_rows}'>"

  # set title
  svg << "<title>#{title}</title>" 

  # background with first color
  svg << "<rect width='100%' height='100%' x='0' y='0' fill='#{matrix[0][0]}' stroke='none' shape-rendering='crispEdges'/>"

  num_rows.times do |row|
    num_cols.times do |col|
      # draw rect if its color its different than background color
      if matrix[row][col] != matrix[0][0]
        svg << "<rect fill='#{matrix[row][col]}' stroke='none' fill-rule='nonzero' x='#{col}' y='#{row}' width='1' height='1' shape-rendering='crispEdges' />"
      end
    end
  end 

  # close svg tag
  svg << "</svg>"

end