processing + propane sketch

0509_smooth_lines_with_easing.rb

#!/usr/bin/env jruby
# frozen_string_literal: false
require 'propane'

# smooth lines with easing  
# propane graffiti by 8mana
# based on code by Casey Reas and Ben Fry

class SmoothLines < Propane::App
  def settings
    size 480, 120
  end

  def setup
    sketch_title 'smooth lines with easing'
    $x = 0
    $y = 0
    $px = 0
    $py = 0
    $easing = 0.05
    stroke 0, 102
  end

  def draw
    targetX = mouseX
    $x += (targetX - $x) * $easing
    targetY = mouseY
    $y += (targetY - $y) * $easing
    weight = dist $x, $y, $px, $py
    strokeWeight weight
    line $x, $y, $px, $py
    $py = $y
    $px = $x
  end
end

SmoothLines.new