如何使用RMagick和Word换行在图像上渲染文本？

gem install rmagick

require 'rmagick'

image = Magick::Image.read('image.jpg').first

draw = Magick::Draw.new
draw.font = 'font.ttf'
draw.pointsize = 24
draw.fill = 'white'

text = 'This is a sample text.'
max_width = image.columns - 20
text_lines = []
current_line = ''
text.split(' ').each do |word|
  if current_line.empty?
    current_line = word
  elsif current_line.length + word.length + 1 < max_width
    current_line += ' ' + word
  else
    text_lines<< current_line
    current_line = word
  end
end
text_lines<< current_line

text_lines.each_with_index do |line, index|
  draw.annotate(image, 0, 0, 10, 30 + index * 30, line) do
    self.gravity = Magick::NorthWestGravity
    self.fill_opacity = 1.0
  end
end

image.write('output.jpg')