Class: GeoPattern::PatternGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/geo_pattern/pattern_generator.rb

Constant Summary collapse

DEFAULTS = 
{
  :base_color => '#933c3c'
}
PATTERNS = 
{
  'chevrons' => ChevronPattern,
  'concentric_circles' => ConcentricCirclesPattern,
  'diamonds' => DiamondPattern,
  'hexagons' => HexagonPattern,
  'mosaic_squares' => MosaicSquaresPattern,
  'nested_squares' => NestedSquaresPattern,
  'octagons' => OctagonPattern,
  'overlapping_circles' => OverlappingCirclesPattern,
  'overlapping_rings' => OverlappingRingsPattern,
  'plaid' => PlaidPattern,
  'plus_signs' => PlusSignPattern,
  'sine_waves' => SineWavePattern,
  'squares' => SquarePattern,
  'tessellation' => TessellationPattern,
  'triangles' => TrianglePattern,
  'xes' => XesPattern,
}.freeze
FILL_COLOR_DARK = 
"#222"
FILL_COLOR_LIGHT = 
"#ddd"
STROKE_COLOR = 
"#000"
STROKE_OPACITY = 
0.02
OPACITY_MIN = 
0.02
OPACITY_MAX = 
0.15

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string, opts = {}) ⇒ PatternGenerator

Returns a new instance of PatternGenerator.



39
40
41
42
43
44
45
46
 
# File 'lib/geo_pattern/pattern_generator.rb', line 39

def initialize(string, opts={})
  @opts = DEFAULTS.merge(opts)
  @hash = Digest::SHA1.hexdigest string
  @svg  = SVG.new

  generate_background
  generate_pattern
end

Instance Attribute Details

#hash ⇒ Object (readonly)

Returns the value of attribute hash.



37
38
39
 
# File 'lib/geo_pattern/pattern_generator.rb', line 37

def hash
  @hash
end

#opts ⇒ Object (readonly)

Returns the value of attribute opts.



37
38
39
 
# File 'lib/geo_pattern/pattern_generator.rb', line 37

def opts
  @opts
end

#svg ⇒ Object (readonly)

Returns the value of attribute svg.



37
38
39
 
# File 'lib/geo_pattern/pattern_generator.rb', line 37

def svg
  @svg
end

Instance Method Details

#base64_string ⇒ Object 



53
54
55
 
# File 'lib/geo_pattern/pattern_generator.rb', line 53

def base64_string
  Base64.strict_encode64(svg_string)
end

#generate_background ⇒ Object 



61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
 
# File 'lib/geo_pattern/pattern_generator.rb', line 61

def generate_background
  if opts[:color]
    rgb = Color::RGB.from_html(opts[:color])
  else
    hue_offset     = PatternHelpers.map(PatternHelpers.hex_val(hash, 14, 3), 0, 4095, 0, 359)
    sat_offset     = PatternHelpers.hex_val(hash, 17, 1)
    base_color     = Color::RGB.from_html(opts[:base_color]).to_hsl
    base_color.hue = base_color.hue - hue_offset;

    if (sat_offset % 2 == 0)
      base_color.saturation = base_color.saturation + sat_offset
    else
      base_color.saturation = base_color.saturation - sat_offset
    end
    rgb = base_color.to_rgb
  end
  r = (rgb.r * 255).round
  g = (rgb.g * 255).round
  b = (rgb.b * 255).round
  svg.rect(0, 0, "100%", "100%", {"fill" => "rgb(#{r}, #{g}, #{b})"})
end

#generate_pattern ⇒ Object 



83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
 
# File 'lib/geo_pattern/pattern_generator.rb', line 83

def generate_pattern
  unless opts[:generator].nil?
    if opts[:generator].is_a? String
      generator = PATTERNS[opts[:generator]]
      puts SVG.as_comment("String pattern references are deprecated as of 1.3.0")
    elsif opts[:generator] < BasePattern
      if PATTERNS.values.include? opts[:generator]
        generator = opts[:generator]
      else
        abort("Error: the requested generator is invalid")
        generator = nil
      end
    end
  end

  generator ||= PATTERNS.values[[PatternHelpers.hex_val(hash, 20, 1), PATTERNS.length - 1].min]

  # Instantiate the generator with the needed references
  # and render the pattern to the svg object
  generator.new(svg, hash).render_to_svg
end

#svg_string ⇒ Object Also known as: to_s 



48
49
50
 
# File 'lib/geo_pattern/pattern_generator.rb', line 48

def svg_string
  svg.to_s
end

#uri_image ⇒ Object 



57
58
59
 
# File 'lib/geo_pattern/pattern_generator.rb', line 57

def uri_image
  "url(data:image/svg+xml;base64,#{base64_string});"
end