heart.rb

require 'rubyplot'

@x1 = []
@y1 = []
for i in 0..1000
  num = Float(i) / Float(500)
  puts num
  x = Math.sin(num * Math::PI)
  x = 16 * x * x * x
  y = 13 * Math.cos(num * Math::PI) - 5 * Math.cos(2 * num * Math::PI) - 2 * Math.cos(3 * num * Math::PI) - 4 * Math.cos(num * Math::PI)
  @x1.push(10 * x)
  @y1.push(10 * y)
end


g = Rubyplot::Figure.new(backend: :magick)
g.scatter! @x1, @y1, marker_color: :pink, label: :heart
g.save('scatter.png')

g2 = Rubyplot::Figure.new(backend: :GR)
g2.text_font = :bookman_light_italic
g2.scatter! @x1, @y1, marker_color: :red
g2.save('scatter2.png')