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cbezier3.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: cbezier3.rb</title>
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<h1>cbezier3.rb</h1>
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<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
imgl = Magick::ImageList.new
imgl.new_image(540, 200, 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(100, 150, 25, 50, 475, 50, 400, 150)
# Draw circles around endpoints
gc.fill_opacity(0)
gc.stroke('gray50').stroke_width(1)
gc.circle(100, 150, 103, 153)
gc.circle(400, 150, 403, 153)
gc.line(100, 150, 25, 50)
gc.line(400, 150, 475, 50)
# Draw filled circles around control points
gc.fill_opacity(1)
gc.fill('gray50')
gc.circle(25, 50, 28, 53)
gc.circle(475, 50, 478, 53)
# Annotate
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.text(107, 150, "'100,150'")
gc.text(30, 50, "'25,50'")
gc.text(409, 150, "'400,150'")
gc.text(480, 50, "'475,50'")
gc.draw(imgl)
imgl.border!(1, 1, 'lightcyan2')
imgl.write('cbezier3.gif')
exit(0)
</pre>
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