Class: SparkleMotion::Nodes::Transforms::Spotlight

Inherits:
SparkleMotion::Nodes::Transform show all
Defined in:
lib/sparkle_motion/nodes/transforms/spotlight.rb

Overview

Spotlight a particular point on the line.

TODO: Integrate the underlying light value but ensure we contrast-stretch TODO: to ensure a bright-enough spotlight over the destination. Maybe a LERP?

TODO: Allow effect to come in / go out over time.

Constant Summary

Constants inherited from SparkleMotion::Node

SparkleMotion::Node::DEBUG_SCALE, SparkleMotion::Node::FRAME_PERIOD

Instance Attribute Summary

Attributes inherited from SparkleMotion::Node

#debug, #history, #lights

Instance Method Summary collapse

Methods inherited from SparkleMotion::Node

#[], #[]=, #snapshot_to!

Constructor Details

#initialize(source:, mask: nil) ⇒ Spotlight

Returns a new instance of Spotlight.



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# File 'lib/sparkle_motion/nodes/transforms/spotlight.rb', line 11

def initialize(source:, mask: nil)
  super(source: source, mask: mask)
  @spotlight = nil
end

Instance Method Details

#clear! ⇒ Object 



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# File 'lib/sparkle_motion/nodes/transforms/spotlight.rb', line 20

def clear!; @spotlight = nil; end

#spotlight!(x) ⇒ Object 



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# File 'lib/sparkle_motion/nodes/transforms/spotlight.rb', line 16

def spotlight!(x)
  @spotlight = x
end

#update(t) ⇒ Object 



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# File 'lib/sparkle_motion/nodes/transforms/spotlight.rb', line 22

def update(t)
  super(t) do |x|
    val = @source[x]
    if @spotlight
      falloff   = 0.9**((@spotlight - x).abs**3)
      val       = falloff
    end
    val
  end
end