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cubic01.rb.html
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<!DOCTYPE public PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
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<title>RMagick example: cubic01.rb</title>
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<body>
<h1>cubic01.rb</h1>
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<pre class="language-ruby">
# frozen_string_literal: true
require 'rvg/rvg'
Magick::RVG.dpi = 90
BORDER = { fill: 'none', stroke: 'blue', stroke_width: 1 }
CONNECT = { fill: 'none', stroke: '#888', stroke_width: 2 }
SAMPLE_PATH = { fill: 'none', stroke: 'red', stroke_width: 5 }
END_POINT = { fill: 'none', stroke: '#888', stroke_width: 2 }
CTL_POINT = { fill: '#888', stroke: 'none' }
AUTO_CTL_POINT = { fill: 'none', stroke: 'blue', stroke_width: 4 }
LABEL = { font_size: 22, font_family: 'Verdana', font_weight: 'normal', font_style: 'normal' }
rvg = Magick::RVG.new(5.cm, 4.cm).viewbox(0, 0, 500, 400) do |canvas|
canvas.title = 'Example cubic01 - cubic Bezier commands in path data'
canvas.desc = <<-END_DESC
Picture showing a simple example of path data using both a
"C" and an "S" command, along with annotations showing the
control points and end points.
END_DESC
canvas.background_fill = 'white'
canvas.rect(496, 395, 1, 1).styles(BORDER)
canvas.polyline(100, 200, 100, 100).styles(CONNECT)
canvas.polyline(250, 100, 250, 200).styles(CONNECT)
canvas.polyline(250, 200, 250, 300).styles(CONNECT)
canvas.polyline(400, 300, 400, 200).styles(CONNECT)
canvas.path('M100,200 C100,100 250,100 250,200 S400,300 400,200').styles(SAMPLE_PATH)
canvas.circle(10, 100, 200).styles(END_POINT)
canvas.circle(10, 250, 200).styles(END_POINT)
canvas.circle(10, 400, 200).styles(END_POINT)
canvas.circle(10, 100, 100).styles(CTL_POINT)
canvas.circle(10, 250, 100).styles(CTL_POINT)
canvas.circle(10, 400, 300).styles(CTL_POINT)
canvas.circle(9, 250, 300).styles(AUTO_CTL_POINT)
canvas.text(25, 70, 'M100,200 C100,100 250,100 250,200').styles(LABEL)
canvas.text(225, 350, 'S400,300 400,200').styles(LABEL)
end
rvg.draw.write('cubic01.gif')
</pre>
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