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ellipse.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: ellipse.rb</title>
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<h1>ellipse.rb</h1>
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<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
imgl = Magick::ImageList.new
imgl.new_image(360, 250, Magick::HatchFill.new('white', 'LightCyan2'))
gc = Magick::Draw.new
gc.fill_opacity(0)
gc.stroke('red').stroke_width(3)
# Draw ellipse
gc.ellipse(180, 125, 150, 75, 0, 270)
# Draw horizontal width line
gc.stroke('gray50').stroke_width(1)
gc.line(180 - 150, 125, 180, 125)
# Draw vertical height line
gc.line(180, 125 - 75, 180, 125)
gc.fill_opacity(0)
# Draw arcStart circle
gc.circle(180 + 150, 125, 180 + 150 + 3, 125 + 3)
# Draw arcEnd circle
gc.circle(180, 125 - 75, 180 + 3, 125 - 75 + 3)
# Annotate
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill_opacity(1)
gc.circle(180, 125, 183, 128)
gc.fill('black')
gc.stroke('transparent')
gc.text(187, 125, "'180,125'")
gc.text(253, 118, "'Start 0 degrees'")
gc.text(187, 50, "'End 270 degrees'")
gc.text(120, 100, "'Height=75'")
gc.text(85, 140, "'Width=150'")
gc.draw(imgl)
imgl.border!(1, 1, 'LightCyan2')
imgl.write('ellipse.gif')
</pre>
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