fix accel

Author: monkstone

processing_app/library/vecmath/vec2d/acceleration_with_vectors.rb

@@ -1,74 +1,80 @@
-#
-# Acceleration with Vectors 
+#!/usr/bin/env jruby -v -W2
+# frozen_string_literal: true
+require 'propane'
+# Acceleration with Vectors
 # by Daniel Shiffman.
 # PVector was used in the original (instead of Vec2D)
-# 
+#
 # Demonstration of the basics of motion with vector.
 # A "Mover" object stores location, velocity, and acceleration as vectors
-# The motion is controlled by affecting the acceleration (in this case 
+# The motion is controlled by affecting the acceleration (in this case
 # towards the mouse)
 #
-# For more examples of simulating motion and physics with vectors, see 
+# For more examples of simulating motion and physics with vectors, see
 # Simulate/ForcesWithVectors, Simulate/GravitationalAttraction3D
 #
+class AccelerationWithVectors < Propane::App
+  # A Mover object
+  attr_reader :mover
 
-# A Mover object
-attr_reader :mover
+  def setup
+    sketch_title 'Acceleration With Vectors'
+    @mover = Mover.new(width, height)
+  end
 
-def setup
-  sketch_title 'Acceleration With Vectors'
-  @mover = Mover.new(width, height)
-end
+  def draw
+    background(0)
+    # Update the location
+    mover.update
+    # Display the Mover
+    mover.display
+  end
 
-def draw
-  background(0)
-  # Update the location
-  mover.update
-  # Display the Mover
-  mover.display
-end
+  ####
+  # The Mover class
+  ####
 
-####
-# The Mover class
-####
+  class Mover
+    include Propane::Proxy
+    # The Mover tracks location, velocity, and acceleration
+    attr_reader :location, :velocity, :acceleration,
+    # The Mover's maximum speed
+    :topspeed
 
-class Mover	
-  # The Mover tracks location, velocity, and acceleration 
-  attr_reader :location, :velocity, :acceleration,
-  # The Mover's maximum speed
-  :topspeed
-  
-  def initialize(width, height)
-    # Start in the center
-    @location = Vec2D.new(width / 2, height / 2)
-    @velocity = Vec2D.new
-    @topspeed = 5
-  end
-  
-  def update    
-    # Compute a vector that points from location to mouse
-    mouse = Vec2D.new(mouse_x, mouse_y)
-    @acceleration = mouse - location
-    # Set magnitude of acceleration
-    acceleration.set_mag(0.2)    
-    # Velocity changes according to acceleration vector
-    @velocity += acceleration
-    # Limit the velocity to topspeed, PVector has a limit function 
-    # here we supply a block that evaluates to a boolean to set
-    # the velocit conditionally
-    velocity.set_mag(topspeed) { velocity.mag > topspeed }
-    # Location changes by velocity vector
-    @location += velocity
+    def initialize(width, height)
+      # Start in the center
+      @location = Vec2D.new(width / 2, height / 2)
+      @velocity = Vec2D.new
+      @topspeed = 5
+    end
+
+    def update
+      # Compute a vector that points from location to mouse
+      mouse = Vec2D.new(mouse_x, mouse_y)
+      @acceleration = mouse - location
+      # Set magnitude of acceleration
+      acceleration.set_mag(0.2)
+      # Velocity changes according to acceleration vector
+      @velocity += acceleration
+      # Limit the velocity to topspeed, PVector has a limit function
+      # here we supply a block that evaluates to a boolean to set
+      # the velocit conditionally
+      velocity.set_mag(topspeed) { velocity.mag > topspeed }
+      # Location changes by velocity vector
+      @location += velocity
+    end
+
+    def display
+      stroke(255)
+      stroke_weight(2)
+      fill(127)
+      ellipse(location.x, location.y, 48, 48)
+    end
   end
-  
-  def display
-    stroke(255)
-    stroke_weight(2)
-    fill(127)
-    ellipse(location.x, location.y, 48, 48)
+
+  def settings
+    size 640, 360, P2D
   end
 end
 
-def settings
-  size 640, 360, P2D
-end
+AccelerationWithVectors.new