Class: GeoPattern::SineWavePattern

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

Constant Summary

Constants inherited from BasePattern

BasePattern::FILL_COLOR_DARK, BasePattern::FILL_COLOR_LIGHT, BasePattern::OPACITY_MAX, BasePattern::OPACITY_MIN, BasePattern::STROKE_COLOR, BasePattern::STROKE_OPACITY

Instance Attribute Summary

Attributes inherited from BasePattern

#hash, #svg

Instance Method Summary collapse

Methods inherited from BasePattern

#fill_color, #hex_val, #map, #opacity

Instance Method Details

#render_to_svg ⇒ Object 



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# File 'lib/geo_pattern/pattern/sine_wave_pattern.rb', line 3

def render_to_svg
  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