Class: GeoPattern::Pattern

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

Constant Summary collapse

DEFAULTS = 
{
  :base_color => '#933c3c'
}
PATTERNS = 
%w[
  octogons
  overlapping_circles
  plus_signs
  xes
  sine_waves
  hexagons
  overlapping_rings
  plaid
  triangles
  squares
  concentric_circles
  diamonds
  tessellation
  nested_squares
  mosaic_squares
  chevrons
].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 = {}) ⇒ Pattern

Returns a new instance of Pattern.



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# File 'lib/geo_pattern/pattern.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.



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# File 'lib/geo_pattern/pattern.rb', line 37

def hash
  @hash
end

#opts ⇒ Object (readonly)

Returns the value of attribute opts.



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# File 'lib/geo_pattern/pattern.rb', line 37

def opts
  @opts
end

#svg ⇒ Object (readonly)

Returns the value of attribute svg.



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# File 'lib/geo_pattern/pattern.rb', line 37

def svg
  @svg
end

Instance Method Details

#base64_string ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 55

def base64_string
  Base64.strict_encode64(svg.to_s)
end

#build_chevron_shape(width, height) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 796

def build_chevron_shape(width, height)
  e = height * 0.66
  [
    %Q{polyline("0,0,#{width/2},#{height-e},#{width/2},#{height},0,#{e},0,0")},
    %Q{polyline("#{width/2},#{height-e},#{width},0,#{width},#{e},#{width/2},#{height},#{width/2},#{height-e}")}
  ]
end

#build_diamond_shape(width, height) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 838

def build_diamond_shape(width, height)
  "#{width/2}, 0, #{width}, #{height/2}, #{width/2}, #{height}, 0, #{height/2}"
end

#build_hexagon_shape(sideLength) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 810

def build_hexagon_shape(sideLength)
  c = sideLength
  a = c/2
  b = Math.sin(60 * Math::PI / 180)*c
  "0,#{b},#{a},0,#{a+c},0,#{2*c},#{b},#{a+c},#{2*b},#{a},#{2*b},0,#{b}"
end

#build_octogon_shape(square_size) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 804

def build_octogon_shape(square_size)
  s = square_size
  c = s * 0.33
  "#{c},0,#{s-c},0,#{s},#{c},#{s},#{s-c},#{s-c},#{s},#{c},#{s},0,#{s-c},0,#{c},#{c},0"
end

#build_plus_shape(square_size) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 817

def build_plus_shape(square_size)
  [
    "rect(#{square_size},0,#{square_size},#{square_size * 3})",
    "rect(0, #{square_size},#{square_size * 3},#{square_size})"
  ]
end

#build_right_triangle_shape(side_length) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 834

def build_right_triangle_shape(side_length)
  "0, 0, #{side_length}, #{side_length}, 0, #{side_length}, 0, 0"
end

#build_rotated_triangle_shape(side_length, width) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 829

def build_rotated_triangle_shape(side_length, width)
  half_height = side_length / 2
  "0, 0, #{width}, #{half_height}, 0, #{side_length}, 0, 0"
end

#build_triangle_shape(side_length, height) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 824

def build_triangle_shape(side_length, height)
  half_width = side_length / 2
  "#{half_width}, 0, #{side_length}, #{height}, 0, #{height}, #{half_width}, 0"
end

#draw_inner_mosaic_tile(x, y, triangle_size, vals) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 842

def draw_inner_mosaic_tile(x, y, triangle_size, vals)
  triangle = build_right_triangle_shape(triangle_size)
  opacity  = opacity(vals[0])
  fill     = fill_color(vals[0])
  styles   = {
    "stroke"         => STROKE_COLOR,
    "stroke-opacity" => STROKE_OPACITY,
    "fill-opacity"   => opacity,
    "fill"           => fill
  }
  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x+triangle_size}, #{y}) scale(-1, 1)"}))
  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x+triangle_size}, #{y+triangle_size*2}) scale(1, -1)"}))

  opacity = opacity(vals[1])
  fill    = fill_color(vals[1])
  styles  = {
    "stroke"         => STROKE_COLOR,
    "stroke-opacity" => STROKE_OPACITY,
    "fill-opacity"   => opacity,
    "fill"           => fill
  }
  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x+triangle_size}, #{y+triangle_size*2}) scale(-1, -1)"}))
  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x+triangle_size}, #{y}) scale(1, 1)"}))
end

#draw_outer_mosaic_tile(x, y, triangle_size, val) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 867

def draw_outer_mosaic_tile(x, y, triangle_size, val)
  opacity  = opacity(val)
  fill     = fill_color(val)
  triangle = build_right_triangle_shape(triangle_size)
  styles   = {
    "stroke"         => STROKE_COLOR,
    "stroke-opacity" => STROKE_OPACITY,
    "fill-opacity"   => opacity,
    "fill"           => fill
  }

  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x}, #{y+triangle_size}) scale(1, -1)"}))
  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x+triangle_size*2}, #{y+triangle_size}) scale(-1, -1)"}))
  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x}, #{y+triangle_size}) scale(1, 1)"}))
  svg.polyline(triangle, styles.merge({"transform" => "translate(#{x+triangle_size*2}, #{y+triangle_size}) scale(-1, 1)"}))
end

#fill_color(val) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 888

def fill_color(val)
  (val % 2 == 0) ? FILL_COLOR_LIGHT : FILL_COLOR_DARK
end

#generate_background ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 63

def generate_background
  if opts[:color]
    rgb = Color::RGB.from_html(opts[:color])
  else
    hue_offset     = map(hex_val(14, 3), 0, 4095, 0, 359)
    sat_offset     = hex_val(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 



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# File 'lib/geo_pattern/pattern.rb', line 85

def generate_pattern
  if opts[:generator]
    if PATTERNS.include?(opts[:generator])
      send("geo_#{opts[:generator]}")
    else
      abort("Error: the requested generator is invalid.")
    end
  else
    pattern = hex_val(20, 1)
    send("geo_#{PATTERNS[pattern]}")
  end
end

#geo_chevrons ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 178

def geo_chevrons
  chevron_width  = map(hex_val(0, 1), 0, 15, 30, 80)
  chevron_height = map(hex_val(0, 1), 0, 15, 30, 80)
  chevron        = build_chevron_shape(chevron_width, chevron_height)

  svg.set_width(chevron_width * 6)
  svg.set_height(chevron_height * 6 * 0.66)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      styles  = {
            "stroke"         => STROKE_COLOR,
            "stroke-opacity" => STROKE_OPACITY,
            "fill"           => fill,
            "fill-opacity"   => opacity,
            "stroke-width"   => 1
      }

      svg.group(chevron, styles.merge({"transform" => "translate(#{x*chevron_width},#{y*chevron_height*0.66 - chevron_height/2})"}))

      # Add an extra row at the end that matches the first row, for tiling.
      if (y == 0)
        svg.group(chevron, styles.merge({"transform" => "translate(#{x*chevron_width},#{6*chevron_height*0.66 - chevron_height/2})"}))
      end
      i += 1
    end
  end
end

#geo_concentric_circles ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 410

def geo_concentric_circles
  scale        = hex_val(0, 1)
  ring_size    = map(scale, 0, 15, 10, 60)
  stroke_width = ring_size / 5

  svg.set_width((ring_size + stroke_width) * 6)
  svg.set_height((ring_size + stroke_width) * 6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      svg.circle(
              x*ring_size + x*stroke_width + (ring_size + stroke_width)/2,
              y*ring_size + y*stroke_width + (ring_size + stroke_width)/2,
              ring_size/2, {
                "fill"   => "none",
                "stroke" => fill,
                "style"  => {
                  "opacity" => opacity,
                  "stroke-width" => "#{stroke_width}px"
                }
              })

      val     = hex_val(39-i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      svg.circle(
              x*ring_size + x*stroke_width + (ring_size + stroke_width)/2,
              y*ring_size + y*stroke_width + (ring_size + stroke_width)/2,
              ring_size/4, {
                "fill"         => fill,
                "fill-opacity" => opacity
              })

      i += 1
    end
  end
end

#geo_diamonds ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 540

def geo_diamonds
  diamond_width  = map(hex_val(0, 1), 0, 15, 10, 50)
  diamond_height = map(hex_val(1, 1), 0, 15, 10, 50)
  diamond        = build_diamond_shape(diamond_width, diamond_height)

  svg.set_width(diamond_width * 6)
  svg.set_height(diamond_height * 3)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      styles = {
        "fill"           => fill,
        "fill-opacity"   => opacity,
        "stroke"         => STROKE_COLOR,
        "stroke-opacity" => STROKE_OPACITY
      }

      dx = (y % 2 == 0) ? 0 : diamond_width / 2

      svg.polyline(diamond, styles.merge({
        "transform" => "translate(#{x*diamond_width - diamond_width/2 + dx}, #{diamond_height/2*y - diamond_height/2})"}))

      # Add an extra one at top-right, for tiling.
      if (x == 0)
        svg.polyline(diamond, styles.merge({
          "transform" => "translate(#{6*diamond_width - diamond_width/2 + dx}, #{diamond_height/2*y - diamond_height/2})"}))
      end

      # Add an extra row at the end that matches the first row, for tiling.
      if (y == 0)
        svg.polyline(diamond, styles.merge({
          "transform" => "translate(#{x*diamond_width - diamond_width/2 + dx}, #{diamond_height/2*6 - diamond_height/2})"}))
      end

      # Add an extra one at bottom-right, for tiling.
      if (x == 0 and y == 0)
        svg.polyline(diamond, styles.merge({
          "transform" => "translate(#{6*diamond_width - diamond_width/2 + dx}, #{diamond_height/2*6 - diamond_height/2})"}))
      end
      i += 1
    end
  end
end

#geo_hexagons ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 98

def geo_hexagons
  scale       = hex_val(0, 1)
  side_length = map(scale, 0, 15, 8, 60)
  hex_height  = side_length * Math.sqrt(3)
  hex_width   = side_length * 2
  hex         = build_hexagon_shape(side_length)

  svg.set_width((hex_width * 3) + (side_length * 3))
  svg.set_height(hex_height * 6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      dy      = x % 2 == 0 ? y*hex_height : y*hex_height + hex_height/2
      opacity = opacity(val)
      fill    = fill_color(val)

      styles = {
        "fill"           => fill,
        "fill-opacity"   => opacity,
        "stroke"         => STROKE_COLOR,
        "stroke-opacity" => STROKE_OPACITY
      }

      svg.polyline(hex, styles.merge({"transform" => "translate(#{x*side_length*1.5 - hex_width/2}, #{dy - hex_height/2})"}))

      # Add an extra one at top-right, for tiling.
      if (x == 0)
        svg.polyline(hex, styles.merge({"transform" => "translate(#{6*side_length*1.5 - hex_width/2}, #{dy - hex_height/2})"}))
      end

      # Add an extra row at the end that matches the first row, for tiling.
      if (y == 0)
        dy = x % 2 == 0 ? 6*hex_height : 6*hex_height + hex_height/2;
        svg.polyline(hex, styles.merge({"transform" => "translate(#{x*side_length*1.5 - hex_width/2}, #{dy - hex_height/2})"}))
      end

       # Add an extra one at bottom-right, for tiling.
      if (x == 0 && y == 0)
        svg.polyline(hex, styles.merge({"transform" => "translate(#{6*side_length*1.5 - hex_width/2}, #{5*hex_height + hex_height/2})"}))
      end
      i += 1
    end
  end
end

#geo_mosaic_squares ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 637

def geo_mosaic_squares
  triangle_size = map(hex_val(0, 1), 0, 15, 15, 50)

  svg.set_width(triangle_size * 8)
  svg.set_height(triangle_size * 8)

  i = 0
  for y in 0..3
    for x in 0..3

      if (x % 2 == 0)
        if (y % 2 == 0)
          draw_outer_mosaic_tile(x*triangle_size*2, y*triangle_size*2, triangle_size, hex_val(i, 1))
        else
          draw_inner_mosaic_tile(x*triangle_size*2, y*triangle_size*2, triangle_size, [hex_val(i, 1), hex_val(i+1, 1)])
        end
      else
        if (y % 2 == 0)
          draw_inner_mosaic_tile(x*triangle_size*2, y*triangle_size*2, triangle_size, [hex_val(i, 1), hex_val(i+1, 1)])
        else
          draw_outer_mosaic_tile(x*triangle_size*2, y*triangle_size*2, triangle_size, hex_val(i, 1))
        end
      end
      i += 1
    end
  end
end

#geo_nested_squares ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 589

def geo_nested_squares
  block_size = map(hex_val(0, 1), 0, 15, 4, 12)
  square_size = block_size * 7

  svg.set_width((square_size + block_size)*6 + block_size*6)
  svg.set_height((square_size + block_size)*6 + block_size*6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      styles = {
        "fill"   => "none",
        "stroke" => fill,
        "style"  => {
          "opacity" => opacity,
          "stroke-width" => "#{block_size}px"
        }
      }

      svg.rect(x*square_size + x*block_size*2 + block_size/2,
                y*square_size + y*block_size*2 + block_size/2,
                square_size, square_size, styles)

      val     = hex_val(39-i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      styles = {
        "fill"   => "none",
        "stroke" => fill,
        "style"  => {
          "opacity" => opacity,
          "stroke-width" => "#{block_size}px"
        }
      }

      svg.rect(x*square_size + x*block_size*2 + block_size/2 + block_size*2,
                y*square_size + y*block_size*2 + block_size/2 + block_size*2,
                block_size * 3, block_size * 3, styles)
      i += 1
    end
  end
end

#geo_octogons ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 360

def geo_octogons
  square_size = map(hex_val(0, 1), 0, 15, 10, 60)
  tile        = build_octogon_shape(square_size)

  svg.set_width(square_size * 6)
  svg.set_height(square_size * 6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      svg.polyline(tile, {
        "fill"           => fill,
        "fill-opacity"   => opacity,
        "stroke"         => STROKE_COLOR,
        "stroke-opacity" => STROKE_OPACITY,
        "transform"      => "translate(#{x*square_size}, #{y*square_size})"
      })
      i += 1
    end
  end
end

#geo_overlapping_circles ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 317

def geo_overlapping_circles
  scale    = hex_val(0, 1)
  diameter = map(scale, 0, 15, 25, 200)
  radius   = diameter/2;

  svg.set_width(radius * 6)
  svg.set_height(radius * 6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      styles = {
        "fill"  => fill,
        "style" => {
          "opacity" => opacity
        }
      }

      svg.circle(x*radius, y*radius, radius, styles)

      # Add an extra one at top-right, for tiling.
      if (x == 0)
        svg.circle(6*radius, y*radius, radius, styles)
      end

      # Add an extra row at the end that matches the first row, for tiling.
      if (y == 0)
        svg.circle(x*radius, 6*radius, radius, styles)
      end

      # Add an extra one at bottom-right, for tiling.
      if (x == 0 and y == 0)
        svg.circle(6*radius, 6*radius, radius, styles)
      end
      i += 1
    end
  end
end

#geo_overlapping_rings ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 454

def geo_overlapping_rings
  scale        = hex_val(0, 1)
  ring_size    = map(scale, 0, 15, 10, 60)
  stroke_width = ring_size / 4

  svg.set_width(ring_size * 6)
  svg.set_height(ring_size * 6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      styles = {
        "fill"   => "none",
        "stroke" => fill,
        "style"  => {
          "opacity" => opacity,
          "stroke-width" => "#{stroke_width}px"
        }
      }

      svg.circle(x*ring_size, y*ring_size, ring_size - stroke_width/2, styles)

      # Add an extra one at top-right, for tiling.
      if (x == 0)
        svg.circle(6*ring_size, y*ring_size, ring_size - stroke_width/2, styles)
      end

      if (y == 0)
        svg.circle(x*ring_size, 6*ring_size, ring_size - stroke_width/2, styles)
      end

      if (x == 0 and y == 0)
        svg.circle(6*ring_size, 6*ring_size, ring_size - stroke_width/2, styles)
      end
      i += 1
    end
  end
end

#geo_plaid ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 665

def geo_plaid
  height = 0
  width  = 0

  # horizontal stripes
  i = 0
  18.times do
    space   = hex_val(i, 1)
    height += space + 5

    val           = hex_val(i+1, 1)
    opacity       = opacity(val)
    fill          = fill_color(val)
    stripe_height = val + 5

    svg.rect(0, height, "100%", stripe_height, {
          "opacity"   => opacity,
          "fill"      => fill
    })
    height += stripe_height
    i += 2
  end

  # vertical stripes
  i = 0
  18.times do
    space  = hex_val(i, 1)
    width += space + 5

    val          = hex_val(i+1, 1)
    opacity      = opacity(val)
    fill         = fill_color(val)
    stripe_width = val + 5

    svg.rect(width, 0, stripe_width, "100%", {
          "opacity"   => opacity,
          "fill"      => fill
    })
    width += stripe_width
    i += 2
  end

  svg.set_width(width)
  svg.set_height(height)
end

#geo_plus_signs ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 212

def geo_plus_signs
  square_size = map(hex_val(0, 1), 0, 15, 10, 25)
  plus_size   = square_size * 3
  plus_shape  = build_plus_shape(square_size)

  svg.set_width(square_size * 12)
  svg.set_height(square_size * 12)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)
      dx      = (y % 2 == 0) ? 0 : 1

      styles = {
        "fill"           => fill,
        "stroke"         => STROKE_COLOR,
        "stroke-opacity" => STROKE_OPACITY,
        "style"          => {
          "fill-opacity" => opacity
        }
      }

      svg.group(plus_shape, styles.merge({
        "transform" => "translate(#{x*plus_size - x*square_size + dx*square_size - square_size},#{y*plus_size - y*square_size - plus_size/2})"}))

      # Add an extra column on the right for tiling.
      if (x == 0)
        svg.group(plus_shape, styles.merge({
          "transform" => "translate(#{4*plus_size - x*square_size + dx*square_size - square_size},#{y*plus_size - y*square_size - plus_size/2})"}))
      end

      # Add an extra row on the bottom that matches the first row, for tiling.
      if (y == 0)
        svg.group(plus_shape, styles.merge({
          "transform" => "translate(#{x*plus_size - x*square_size + dx*square_size - square_size},#{4*plus_size - y*square_size - plus_size/2})"}))
      end

      # Add an extra one at top-right and bottom-right, for tiling.
      if (x == 0 && y == 0)
        svg.group(plus_shape, styles.merge({
          "transform" => "translate(#{4*plus_size - x*square_size + dx*square_size - square_size},#{4*plus_size - y*square_size - plus_size/2})"}))
      end
      i += 1
    end
  end
end

#geo_sine_waves ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 145

def geo_sine_waves
  period     = map(hex_val(0, 1), 0, 15, 100, 400).floor
  amplitude  = map(hex_val(1, 1), 0, 15, 30, 100).floor
  wave_width = map(hex_val(2, 1), 0, 15, 3, 30).floor

  svg.set_width(period)
  svg.set_height(wave_width * 36)

  for i in 0..35
    val      = hex_val(i, 1)
    opacity  = opacity(val)
    fill     = fill_color(val)
    x_offset = period / 4 * 0.7

    styles = {
        "fill"      => "none",
        "stroke"    => fill,
        "style"     => {
          "opacity"      => opacity,
          "stroke-width" => "#{wave_width}px"
        }
    }

    str = "M0 "+amplitude.to_s+
          " C "+x_offset.to_s+" 0, "+(period/2 - x_offset).to_s+" 0, "+(period/2).to_s+" "+amplitude.to_s+
          " S "+(period-x_offset).to_s+" "+(amplitude*2).to_s+", "+period.to_s+" "+amplitude.to_s+
          " S "+(period*1.5-x_offset).to_s+" 0, "+(period*1.5).to_s+", "+amplitude.to_s;

    svg.path(str, styles.merge({"transform" => "translate(-#{period/4}, #{wave_width*i-amplitude*1.5})"}))
    svg.path(str, styles.merge({"transform" => "translate(-#{period/4}, #{wave_width*i-amplitude*1.5 + wave_width*36})"}))
  end
end

#geo_squares ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 386

def geo_squares
  square_size = map(hex_val(0, 1), 0, 15, 10, 60)

  svg.set_width(square_size * 6)
  svg.set_height(square_size * 6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      svg.rect(x*square_size, y*square_size, square_size, square_size, {
        "fill"           => fill,
        "fill-opacity"   => opacity,
        "stroke"         => STROKE_COLOR,
        "stroke-opacity" => STROKE_OPACITY
      })
      i += 1
    end
  end
end

#geo_tessellation ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 711

def geo_tessellation
  # 3.4.6.4 semi-regular tessellation
  side_length     = map(hex_val(0, 1), 0, 15, 5, 40)
  hex_height      = side_length * Math.sqrt(3)
  hex_width       = side_length * 2
  triangle_height = side_length/2 * Math.sqrt(3)
  triangle        = build_rotated_triangle_shape(side_length, triangle_height)
  tile_width      = side_length*3 + triangle_height*2
  tile_height     = (hex_height * 2) + (side_length * 2)

  svg.set_width(tile_width)
  svg.set_height(tile_height)

  for i in 0..19
    val     = hex_val(i, 1)
    opacity = opacity(val)
    fill    = fill_color(val)

    styles  = {
            "stroke"         => STROKE_COLOR,
            "stroke-opacity" => STROKE_OPACITY,
            "fill"           => fill,
            "fill-opacity"   => opacity,
            "stroke-width"   => 1
    }

    case i
    when 0 # all 4 corners
      svg.rect(-side_length/2, -side_length/2, side_length, side_length, styles)
      svg.rect(tile_width - side_length/2, -side_length/2, side_length, side_length, styles)
      svg.rect(-side_length/2, tile_height-side_length/2, side_length, side_length, styles)
      svg.rect(tile_width - side_length/2, tile_height-side_length/2, side_length, side_length, styles)
    when 1 # center / top square
      svg.rect(hex_width/2 + triangle_height, hex_height/2, side_length, side_length, styles)
    when 2 # side squares
      svg.rect(-side_length/2, tile_height/2-side_length/2, side_length, side_length, styles)
      svg.rect(tile_width-side_length/2, tile_height/2-side_length/2, side_length, side_length, styles)
    when 3 # center / bottom square
      svg.rect(hex_width/2 + triangle_height, hex_height * 1.5 + side_length, side_length, side_length, styles)
    when 4 # left top / bottom triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{side_length/2}, #{-side_length/2}) rotate(0, #{side_length/2}, #{triangle_height/2})"}))
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{side_length/2}, #{tile_height--side_length/2}) rotate(0, #{side_length/2}, #{triangle_height/2}) scale(1, -1)"}))
    when 5 # right top / bottom triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{tile_width-side_length/2}, #{-side_length/2}) rotate(0, #{side_length/2}, #{triangle_height/2}) scale(-1, 1)"}))
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{tile_width-side_length/2}, #{tile_height+side_length/2}) rotate(0, #{side_length/2}, #{triangle_height/2}) scale(-1, -1)"}))
    when 6 # center / top / right triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{tile_width/2+side_length/2}, #{hex_height/2})"}))
    when 7 # center / top / left triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{tile_width-tile_width/2-side_length/2}, #{hex_height/2}) scale(-1, 1)"}))
    when 8 # center / bottom / right triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{tile_width/2+side_length/2}, #{tile_height-hex_height/2}) scale(1, -1)"}))
    when 9 # center / bottom / left triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{tile_width-tile_width/2-side_length/2}, #{tile_height-hex_height/2}) scale(-1, -1)"}))
    when 10 # left / middle triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{side_length/2}, #{tile_height/2 - side_length/2})"}))
    when 11 # right / middle triangle
      svg.polyline(triangle, styles.merge({"transform" => "translate(#{tile_width-side_length/2}, #{tile_height/2 - side_length/2}) scale(-1, 1)"}))
    when 12 # left / top square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "translate(#{side_length/2}, #{side_length/2}) rotate(-30, 0, 0)"}))
    when 13 # right / top square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "scale(-1, 1) translate(#{-tile_width+side_length/2}, #{side_length/2}) rotate(-30, 0, 0)" }))
    when 14 # left / center-top square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "translate(#{side_length/2}, #{tile_height/2-side_length/2-side_length}) rotate(30, 0, #{side_length})" }))
    when 15 # right / center-top square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "scale(-1, 1) translate(#{-tile_width+side_length/2}, #{tile_height/2-side_length/2-side_length}) rotate(30, 0, #{side_length})" }))
    when 16 # left / center-top square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "scale(1, -1) translate(#{side_length/2}, #{-tile_height+tile_height/2-side_length/2-side_length}) rotate(30, 0, #{side_length})" }))
    when 17 # right / center-bottom square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "scale(-1, -1) translate(#{-tile_width+side_length/2}, #{-tile_height+tile_height/2-side_length/2-side_length}) rotate(30, 0, #{side_length})" }))
    when 18 # left / bottom square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "scale(1, -1) translate(#{side_length/2}, #{-tile_height+side_length/2}) rotate(-30, 0, 0)"}))
    when 19 # right / bottom square
      svg.rect(0, 0, side_length, side_length,
                styles.merge({"transform" => "scale(-1, -1) translate(#{-tile_width+side_length/2}, #{-tile_height+side_length/2}) rotate(-30, 0, 0)"}))
    end
  end
end

#geo_triangles ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 497

def geo_triangles
  scale           = hex_val(0, 1)
  side_length     = map(scale, 0, 15, 15, 80)
  triangle_height = side_length/2 * Math.sqrt(3)
  triangle        = build_triangle_shape(side_length, triangle_height)

  svg.set_width(side_length * 3)
  svg.set_height(triangle_height * 6)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      fill    = fill_color(val)

      styles = {
        "fill"           => fill,
        "fill-opacity"   => opacity,
        "stroke"         => STROKE_COLOR,
        "stroke-opacity" => STROKE_OPACITY
      }

      rotation = ""
      if y % 2 == 0
        rotation = x % 2 == 0 ? 180 : 0
      else
        rotation = x % 2 != 0 ? 180 : 0
      end

      svg.polyline(triangle, styles.merge({
        "transform" => "translate(#{x*side_length*0.5 - side_length/2}, #{triangle_height*y}) rotate(#{rotation}, #{side_length/2}, #{triangle_height/2})"}))

      # Add an extra one at top-right, for tiling.
      if (x == 0)
        svg.polyline(triangle, styles.merge({
          "transform" => "translate(#{6*side_length*0.5 - side_length/2}, #{triangle_height*y}) rotate(#{rotation}, #{side_length/2}, #{triangle_height/2})"}))
      end
      i += 1
    end
  end
end

#geo_xes ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 262

def geo_xes
  square_size = map(hex_val(0, 1), 0, 15, 10, 25)
  x_shape     = build_plus_shape(square_size) # rotated later
  x_size      = square_size * 3 * 0.943

  svg.set_width(x_size * 3)
  svg.set_height(x_size * 3)

  i = 0
  for y in 0..5
    for x in 0..5
      val     = hex_val(i, 1)
      opacity = opacity(val)
      dy      = x % 2 == 0 ? y*x_size - x_size*0.5 : y*x_size - x_size*0.5 + x_size/4
      fill    = fill_color(val)

      styles = {
        "fill"  => fill,
        "style" => {
          "opacity" => opacity
        }
      }

      svg.group(x_shape, styles.merge({
        "transform" => "translate(#{x*x_size/2 - x_size/2},#{dy - y*x_size/2}) rotate(45, #{x_size/2}, #{x_size/2})"}))

      # Add an extra column on the right for tiling.
      if (x == 0)
        svg.group(x_shape, styles.merge({
          "transform" => "translate(#{6*x_size/2 - x_size/2},#{dy - y*x_size/2}) rotate(45, #{x_size/2}, #{x_size/2})"}))
      end

      # Add an extra row on the bottom that matches the first row, for tiling.
      if (y == 0)
        dy = x % 2 == 0 ? 6*x_size - x_size/2 : 6*x_size - x_size/2 + x_size/4;
        svg.group(x_shape, styles.merge({
          "transform" => "translate(#{x*x_size/2 - x_size/2},#{dy - 6*x_size/2}) rotate(45, #{x_size/2}, #{x_size/2})"}))
      end

      # These can hang off the bottom, so put a row at the top for tiling.
      if (y == 5)
        svg.group(x_shape, styles.merge({
          "transform" => "translate(#{x*x_size/2 - x_size/2},#{dy - 11*x_size/2}) rotate(45, #{x_size/2}, #{x_size/2})"}))
      end

      # Add an extra one at top-right and bottom-right, for tiling.
      if (x == 0 && y == 0)
        svg.group(x_shape, styles.merge({
          "transform" => "translate(#{6*x_size/2 - x_size/2},#{dy - 6*x_size/2}) rotate(45, #{x_size/2}, #{x_size/2})"}))
      end
      i += 1
    end
  end
end

#hex_val(index, len) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 884

def hex_val(index, len)
  hash[index, len || 1].to_i(16)
end

#map(value, v_min, v_max, d_min, d_max) ⇒ Object

Ruby implementation of Processing’s map function processing.org/reference/map_.html



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# File 'lib/geo_pattern/pattern.rb', line 898

def map(value, v_min, v_max, d_min, d_max) # v for value, d for desired
  v_value = value.to_f # so it returns float

  v_range = v_max - v_min
  d_range = d_max - d_min
  (v_value - v_min) * d_range / v_range + d_min
end

#opacity(val) ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 892

def opacity(val)
  map(val, 0, 15, OPACITY_MIN, OPACITY_MAX)
end

#svg_string ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 47

def svg_string
  svg.to_s
end

#to_s ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 51

def to_s
  svg_string
end

#uri_image ⇒ Object 



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# File 'lib/geo_pattern/pattern.rb', line 59

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