replace !gsub with gsub

Author: monkstone

processing_app/topics/lsystems/csplant.rb

@@ -66,7 +66,7 @@ def render
     specular(255, 255, 255)
     shininess(1.0)
     repeat = 1
-    production.each_char do |ch|
+    production.scan(/./) do |ch|
       case ch
       when 'F'
         translate(0, len / -2, 0)

processing_app/topics/lsystems/david_tour.rb

@@ -58,7 +58,7 @@ def create_grammar(gen)
   def translate_rules(prod)
     swap = false
     [].tap do |points| # An array to store lines as a flat array of points
-      prod.scan(/./) do |ch|
+      prod.scan(/./) do |ch||
         case ch
         when 'F'
           points << xpos << ypos << (@xpos += draw_length * Math.cos(theta)) << (@ypos -= draw_length * Math.sin(theta))

processing_app/topics/lsystems/library/cs_grammar/cs_grammar.rb

@@ -43,7 +43,7 @@ def generate(repeat = 0) # repeat iteration grammar rules
 
   def new_production(prod) # single iteration grammar rules
     @idx = -1
-    prod.gsub!(/./) do |ch|
+    prod.gsub(/./) do |ch|
       get_rule(prod, ch)
     end
   end

processing_app/topics/lsystems/library/stochastic_grammar/stochastic_grammar.rb

@@ -43,7 +43,7 @@ def add_rule(pre, rule, weight = 1.0) # default weighting 1
   end
 
   def new_production(prod) # note the use of gsub!
-    prod.gsub!(/./) do |ch|
+    prod.gsub(/./) do |ch|
       rule?(ch) ? stochastic_rule(srules[ch]) : ch
     end
   end

processing_app/topics/lsystems/mpeano.rb

@@ -64,7 +64,7 @@ def generate(gen)
 
   def translate_rules(prod)
     [].tap do |points| # An empty array to store line vertices
-      prod.scan(/./) do |ch|
+      prod.scan(/./) do |ch||
         case ch
         when 'F'
           points << xpos << ypos << (@xpos -= draw_length * cos(theta)) << (@ypos -= draw_length * sin(theta))

processing_app/topics/lsystems/peano.rb

@@ -70,7 +70,7 @@ def translate_rules(prod)
     coss = ->(orig, alpha, len) { orig + len * DegLut.cos(alpha) }
     sinn = ->(orig, alpha, len) { orig - len * DegLut.sin(alpha) }
     [].tap do |pts| # An array to store line vertices as Vec2D
-      prod.scan(/./) do |ch|
+      prod.scan(/./) do |ch||
         case ch
         when 'F'
           pts << vec.copy

processing_app/topics/lsystems/three_d_tree.rb

@@ -75,7 +75,7 @@ def initialize
   end
 
   def render
-    production.each_char do |ch|
+    production.scan(/./) do |ch
       case ch
       when 'F'
         fill(0, 200, 0)