# contributed by monkstone load_library 'context_free' def setup_the_dragon @dragon = ContextFree.define do rule :start do dragon alpha: 1 end rule :dragon do square hue: 0, brightness: 0, saturation: 1, alpha: 0.02 split do dragon size: 1/Math.sqrt(2), rotation: -45, x: 0.25, y: 0.25 rewind dragon size: 1/Math.sqrt(2), rotation: 135, x: 0.25, y: 0.25 rewind end end end end def setup size 800, 500 setup_the_dragon smooth draw_it end def draw # Do nothing. end def draw_it background 255 @dragon.render :start, size: width*0.8, stop_size: 2, start_x: width/3, start_y: height/3.5 end

Here's a sketch with a simple custom shape of an isosceles triangle

load_library 'context_free' def setup_the_spiral @spiral= ContextFree.define do ############ Begin defining custom terminal, an isoceles triangle class << self define_method(:isoceles) do |some_options| # isoceles triangle size, options = *self.get_shape_values(some_options) rot = options[:rotation] rotate(rot) if rot $app.triangle(-0.5 * size, -0.5 * size, -0.5 * size, 0.5 * size, 0.5 * size, 0.5 * size) rotate(-rot) if rot end end ########### End definition of custom terminal 'isoceles' rule :spiral do isoceles brightness: -1, rotation: 90 spiral rotation: 135, size: 1/sqrt(2), x: 1/sqrt(2) end end end def setup size 800, 500 setup_the_spiral draw_it end def draw # Do nothing. end def draw_it background 255 @spiral.render :spiral, size: height, start_x: width/3, start_y: height/2 end

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