File: triangle01.rb

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ruby-rmagick 6.0.1-3
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require 'rvg/rvg'

Magick::RVG.dpi = 90

rvg = Magick::RVG.new(4.cm, 4.cm).viewbox(0, 0, 400, 400) do |canvas|
  canvas.title = "Example triangle01 - simple example of a 'path'"
  canvas.desc = 'A path that draws a triangle'

  canvas.background_fill = 'white'
  canvas.rect(395, 395, 1, 1).styles(fill: 'none', stroke: 'blue')

  canvas.path('M 100 100 L 300 100 L 200 300 z').styles(fill: 'red', stroke: 'blue', stroke_width: 3)
end

rvg.draw.write('triangle01.gif')