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# Make a 32x32 animated GIF that resembles the OS X animation.
# This produces a very small (~2.6Kb) GIF file.
require 'RMagick'
puts <<END_INFO
This example creates an animated GIF that resembles the OS X "waiting" icon.
You can view the GIF with the command
animate spinner.gif
END_INFO
NFRAMES = 12 # number of frames in the animation
DIM = 32 # width & height of image in pixels
DELAY = 100.0 / (NFRAMES/2) # 2 rotations per second
# 'frame' is a single frame in the animation.
frame = Magick::Image.new(DIM, DIM) {self.background_color = 'transparent'}
# 'spinner' will contain the frames that make up the animated GIF
spinner = Magick::ImageList.new
# 'level' is the change from darkest gray to white
level = Magick::MaxRGB / 2 / NFRAMES
NFRAMES.times do |x|
gc = Magick::Draw.new
gc.translate(DIM/2, DIM/2)
gc.stroke('none')
intensity = 0.58 * Magick::MaxRGB
fill_color = Magick::Pixel.new(intensity, intensity, intensity).to_color
gc.fill(fill_color)
angle = x * (360/NFRAMES)
NFRAMES.times do
gc.rotate(angle)
fill_color = Magick::Pixel.new(intensity, intensity, intensity).to_color
gc.fill(fill_color)
gc.roundrectangle(7, -1, 15, 0, 1, 1)
angle = -(360/NFRAMES)
intensity += level
end
spinner << frame.copy
gc.draw(spinner)
end
spinner.delay = DELAY
spinner.compression = Magick::LZWCompression
spinner.write('spinner.gif')
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