Class: AnalyticsCharts::CustomModule

Inherits:
Object
  • Object
show all
Includes:
Magick
Defined in:
lib/analytics_charts/custom_module.rb

Instance Method Summary collapse

Constructor Details

#initialize(image_path, text, output_path) ⇒ CustomModule

Returns a new instance of CustomModule.



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# File 'lib/analytics_charts/custom_module.rb', line 5

def initialize(image_path, text, output_path)
  @d = Draw.new

  @d.fill = 'white'
  @d.font = 'Helvetica'
  @pointsize = 18
  @d.pointsize = @pointsize
  @d.font_weight = 500
  @composite_image = Image.read(image_path)[0]
  @dummy_image = Image.new(1,1)
  @composite_columns = @composite_image.columns
  @composite_rows = @composite_image.rows
  text = text.gsub(/['%]/, '%' => '%%', "'" => "\'")
  begin
    @rows_of_text = tokenize_text_by_lines(text)
  rescue
    puts "Had some error in CustomModule, probably a nil calling each"
    return
  end

  num_separators = @rows_of_text.count {|row| row.empty? }
  num_special_sep = @rows_of_text.count {|row| row.include? "@$$" }
  @line_height = @pointsize + 2
  @sep_offset = @line_height / 2
  starting_offset = @line_height / 2
  ending_offset = @line_height / 2
  @height = @composite_rows + (@rows_of_text.size - num_separators) *
    @line_height + (num_separators-num_special_sep) * @sep_offset +
    starting_offset + ending_offset
  @base_image = Image.new(@composite_columns, @height) {
    self.background_color = "black"
  }
  @base_image.composite!(@composite_image,0,0,OverCompositeOp)
  #@d = @d.stroke_color 'white'
  #@d.stroke_width(1)
  #@d = @d.line(0, @composite_rows, @composite_columns, @composite_rows)
  #@d.draw(@base_image)
  y_offset = @composite_rows + starting_offset
  @rows_of_text.each do |text|
    if text.include? "@$$" # No paragraph break if we insert this uncommonly used word
      text.sub!("@$$", "")
      y_offset -= @sep_offset
      y_offset += @line_height
      @d.annotate(@base_image, 0 ,0, @pointsize, y_offset, text)
      next
    else
      if text.empty?
        y_offset += @sep_offset
      else
        y_offset += @line_height
        @d.annotate(@base_image, 0 ,0, @pointsize, y_offset, text)
      end
    end
  end
  @base_image.write(output_path)
end

Instance Method Details

#fits_in_a_line?(text) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/analytics_charts/custom_module.rb', line 88

def fits_in_a_line?(text)
  return @d.get_type_metrics(@dummy_image,text).width < @composite_image.columns - 36
end

#line_wrap(text) ⇒ Object 



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# File 'lib/analytics_charts/custom_module.rb', line 72

def line_wrap(text)
  tokens = text.split.reverse # Pop stuff off
  # Safety check, do not allow super long words.
  tokens.each {|token| return "" if not fits_in_a_line?(token) }
  line_wrap_tokens = Array.new
  line_builder = ""
  while tokens.size != 0
    line_builder = tokens.pop # Pop the first word in a line
    while tokens.size != 0 and fits_in_a_line?(line_builder + " " + tokens.last)
      line_builder += " " + tokens.pop
    end
    line_wrap_tokens.push(line_builder) # Add to list of lines
  end
  line_wrap_tokens
end

#tokenize_text_by_lines(text) ⇒ Object 



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# File 'lib/analytics_charts/custom_module.rb', line 61

def tokenize_text_by_lines(text)
  # First split the text by the line carriage element
  carriage_split_lines = text.split("\r\n")
  line_tokens = Array.new
  carriage_split_lines.each do |carriage_split_line|
    line_wrap_lines = line_wrap(carriage_split_line)
    line_wrap_lines.each { |line| line_tokens.push(line) }
    line_tokens.push("")
  end
  line_tokens
end