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arc.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">
<head>
<meta name="generator" content="ex2html.rb" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="css/popup.css" />
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<script>
hljs.configure({ cssSelector: "pre" });
hljs.highlightAll();
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<title>RMagick example: arc.rb</title>
</head>
<body>
<h1>arc.rb</h1>
<div class="bodybox">
<div class="bodyfloat">
<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
i = Magick::Image.new(300, 220, Magick::HatchFill.new('white', 'lightcyan2'))
gc = Magick::Draw.new
# Draw the border rectangle.
gc.fill_opacity(0)
gc.stroke_width(1)
gc.stroke('gray50')
gc.rectangle(40, 50, 250, 180)
# Draw the circles around the rectangle corners and
# arc endpoints. All the circles have a 3-pixel radius.
gc.circle(40, 50, 40 + 3, 50)
gc.circle(250, 180, 250 + 3, 180)
gc.circle(250, 114, 250 + 3, 114)
gc.circle(146, 50, 146 + 3, 50)
# Annotate
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
# xMagick recognizes the braces as delimiters.
gc.gravity(Magick::NorthWestGravity)
gc.text(42, 37, '{40, 50}')
gc.text(188, 108, '{0 degrees}')
gc.gravity(Magick::SouthEastGravity)
gc.text(300 - 250, 220 - 195, '{250, 180}')
gc.gravity(Magick::NorthGravity)
gc.text(0, 67, '{270 degrees}')
# Draw the arc
gc.fill_opacity(0)
gc.stroke('red').stroke_width(3)
gc.arc(40, 50, 250, 180, 0, 270)
# Draw on the canvas
gc.draw(i)
i.border!(1, 1, 'lightcyan2')
# i.display
i.write('arc.gif')
</pre>
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