require "active_support/core_ext/numeric/time.rb" module Tlapse module Capture def self.capture_single(format: nil) puts "The format key is not yet supported" if format `gphoto2 --capture-image-and-download` end ## # Calculate how many captures are needed given a duration of capture # time and a desired interval between captures. # # @example # captures_needed duration: 5.minutes, interval: 30.seconds # => 10 # # Specify either `start_time` and `end_time` or `duration`. If both # are given, `duration` is preferred. # # @param start_time: [Time] when to start capturing # @param end_time: [Time] when to end capturing # @param duration: [Duration] duration over which images are captured. # If specifying, do not also specify `end_time # @param interval: [Duration] time between each capture # @return how many captures will be taken over the duration and interval def self.captures_needed(start_time: Time.now, end_time: Time.now, duration: nil, interval:) unless duration start_time = start_time.to_i end_time = end_time.to_i duration = end_time - start_time end duration / interval end ## # Capture a series of timelapse images over the given duration # and at the given interval. # # @return [String] a gphoto2 command with the desired arguments def self.timelapse_command(from: Time.now, to:, interval:) captures = self.captures_needed( start_time: from, end_time: to, interval: interval ) command = "gphoto2 --capture-image-and-download" command += " -I #{interval}" command += " -F #{captures}" command += ' --filename "%Y-%m-%d_%H-%M-%S.jpg"' end ## # Capture a timelapse image once per interval while the sun is up. # # @param interval [Duration] how frequently to capture images # @return [String] a gphoto2 command with the desired arguments def self.timelapse_command_while_sun_is_up(interval: 5.minutes) sunrise = SolarEvent.sunrise sunset = SolarEvent.sunset now = Time.now # Use now as starting time if sunrise has passed sunrise = now > sunrise ? now : sunrise captures = self.captures_needed( start_time: sunrise, end_time: sunset, interval: interval ) "gphoto2 --capture-image-and-download -I #{interval} -F #{captures}" end end # Capture end # Tlapse