Video capture with ruby-processing

Simple sketch to get you started with video capture on ruby-processing, makes sense to set sketch to dimensions you think that your camera can work with (use cameras instead of select for an unfiltered list, but it can be very long list as many low resolution cameras get listed, each with lots of fps settings).

load_library :video

include_package 'processing.video'

attr_reader :cam

def setup
  size(960, 544)
  cameras = Capture.list
  fail 'There are no cameras available for capture.' if (cameras.length == 0)
  p 'Matching cameras available:'
  size_pattern = Regexp.new(format('%dx%d', width, height))
  select = cameras.grep size_pattern # filter available cameras
  select.map { |cam| p cam }
  fail 'There are no matching cameras.' if (select.length == 0)
  start_capture(select[0])
end

def start_capture(cam_string)
  # The camera can be initialized directly using an
  # element from the array returned by list:
  @cam = Capture.new(self, cam_string)
  p format('Using camera %s', cam_string)
  cam.start
end

def draw
  return unless (cam.available == true)
  cam.read
  image(cam, 0, 0)
  # The following does the same, and is faster when just drawing the image
  # without any additional resizing, transformations, or tint.
  # set(0, 0, cam)
end