Class: Sunniesnow::Charter::TipPointStart

Inherits:
Object
  • Object
show all
Defined in:
lib/sscharter.rb

Instance Method Summary collapse

Constructor Details

#initialize(x = 0, y = 0, relative_time = 0.0, relative: true, speed: nil, relative_beat: nil, beat_speed: nil) ⇒ TipPointStart

Returns a new instance of TipPointStart.



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# File 'lib/sscharter.rb', line 223

def initialize x = 0, y = 0, relative_time = 0.0, relative: true, speed: nil,
    relative_beat: nil, beat_speed: nil
  @x = x
  @y = y
  @relative_time = relative_time
  @relative = relative
  @speed = speed
  @relative_beat = relative_beat
  @beat_speed = beat_speed
  check
end

Instance Method Details

#check ⇒ Object 



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# File 'lib/sscharter.rb', line 235

def check
  if !@x.is_a?(Numeric) || !@y.is_a?(Numeric)
    raise ArgumentError, 'x and y must be numbers'
  end
  @x = @x.to_f
  @y = @y.to_f
  i[@relative_time @speed @relative_beat @beat_speed].each do |key|
    value = instance_variable_get key
    raise ArgumentError, "cannot specify both #@time_key and #{key}" if @time_key && value&.!=(0)
    @time_key = key if value&.!=(0)
  end
  @time_key ||= :@relative_time
end

#get_start_placeholder(start_event) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/sscharter.rb', line 249

def get_start_placeholder start_event
  raise ArgumentError, "start_event is not tip-pointable" unless start_event.tip_pointable?
  result = Event.new :placeholder, start_event.beat, start_event.bpm_changes
  if @relative
    result[:x] = start_event[:x] + @x
    result[:y] = start_event[:y] + @y
  else
    result[:x] = @x
    result[:y] = @y
  end
  case @time_key
  when :@relative_time
    raise ArgumentError, "relative_time must be a number" unless @relative_time.is_a? Numeric
    raise ArgumentError, "relative_time must be non-negative" if @relative_time < 0
    result.offset = -@relative_time.to_f
  when :@speed
    raise ArgumentError, "speed must be a number" unless @speed.is_a? Numeric
    raise ArgumentError, "speed must be positive" if @speed <= 0
    result.offset = -Math.hypot(result[:x] - start_event[:x], result[:y] - start_event[:y]) / @speed
  when :@relative_beat
    raise ArgumentError, "relative_beat must be a number" unless @relative_beat.is_a? Numeric
    raise ArgumentError, "relative_beat must be non-negative" if @relative_beat < 0
    warn "Rational is recommended over Float for relative_beat" if @relative_beat.is_a? Float
    result.beat -= @relative_beat.to_r
  when :@beat_speed
    raise ArgumentError, "beat_speed must be a number" unless @beat_speed.is_a? Numeric
    raise ArgumentError, "beat_speed must be positive" if @beat_speed <= 0
    delta_beat = Math.hypot(result[:x] - start_event[:x], result[:y] - start_event[:y]) / @beat_speed
    result.beat -= delta_beat.to_r # a little weird, but fine
  end
  result[:tip_point] = start_event[:tip_point]
  result
end