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bounding_box.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" />
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<title>RMagick example: bounding_box.rb</title>
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<body>
<h1>bounding_box.rb</h1>
<div class="bodybox">
<div class="bodyfloat">
<pre class="language-ruby">
# frozen_string_literal: true
require 'rmagick'
img = Magick::Image.new(200, 200) { |info| info.background_color = '#ffffcc' }
# Draw a blue circle.
gc = Magick::Draw.new
gc.stroke_width(5)
gc.stroke('blue')
gc.fill_opacity(0)
gc.circle(100, 100, 100, 150)
gc.draw(img)
# Get the bounding box. Use the values to draw
# a gray square surrounding the circle. Highlight
# the corners with tiny red circles.
bb = img.bounding_box
gc = Magick::Draw.new
gc.stroke('gray50')
gc.fill_opacity(0)
gc.rectangle(bb.x, bb.y, bb.x + bb.width, bb.y + bb.height)
gc.stroke('red')
gc.circle(bb.x, bb.y, bb.x + 2, bb.y + 2)
gc.circle(bb.x + bb.width, bb.y, bb.x + bb.width + 2, bb.y + 2)
gc.circle(bb.x, bb.y + bb.height, bb.x + 2, bb.y + bb.height + 2)
gc.circle(bb.x + bb.width, bb.y + bb.height, bb.x + bb.width + 2, bb.y + bb.height + 2)
gc.fill('black')
gc.fill_opacity(1)
gc.stroke('transparent')
gc.font_weight(Magick::NormalWeight)
gc.font_style(Magick::NormalStyle)
gc.pointsize(9)
gc.text(bb.x - 15, bb.y - 5, "'#{bb.x},#{bb.y}'")
gc.text(bb.x + bb.width - 15, bb.y - 5, "'#{bb.x + bb.width},#{bb.y}'")
gc.text(bb.x - 15, bb.y + bb.height + 15, "'#{bb.x},#{bb.y + bb.height}'")
gc.text(bb.x + bb.width - 15, bb.y + bb.height + 15, "'#{bb.x + bb.width},#{bb.y + bb.height}'")
gc.draw(img)
img.write('bounding_box.gif')
exit
</pre>
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