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cbezier4.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: cbezier4.rb</title>
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<h1>cbezier4.rb</h1>
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<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
imgl = Magick::ImageList.new
imgl.new_image(390, 360, Magick::HatchFill.new('white', 'lightcyan2'))
gc = Magick::Draw.new
# Draw Bezier curve
gc.stroke('red')
gc.stroke_width(3)
gc.fill_opacity(0)
gc.bezier(20, 180, 20, 30, 320, 330, 320, 180)
# Draw circles around endpoints
gc.fill_opacity(0)
gc.stroke('gray50').stroke_width(1)
gc.circle(20, 180, 23, 183)
gc.circle(320, 180, 323, 183)
# Draw filled circles around control points
gc.line(20, 180, 20, 30)
gc.line(320, 180, 320, 330)
gc.fill_opacity(1)
gc.fill('gray50')
gc.circle(20, 30, 23, 33)
gc.circle(320, 330, 323, 333)
# Annotate
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.text(29, 180, "'20,180'")
gc.text(29, 33, "'20,30'")
gc.text(329, 330, "'320,330'")
gc.text(329, 180, "'320,180'")
gc.draw(imgl)
imgl.border!(1, 1, 'lightcyan2')
imgl.write('cbezier4.gif')
exit(0)
</pre>
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