From c85f6533efb50981ef8cf59e840a1f8b58b4deef Mon Sep 17 00:00:00 2001
From: realtradam <github@tradam.dev>
Date: Fri, 17 Dec 2021 01:29:19 -0500
Subject: added boid bounds rule

---
 app/components/rules/bounds.rb    |  5 +++++
 app/main.rb                       |  2 ++
 app/systems/rules/bounds.rb       | 20 ++++++++++++++++++++
 app/systems/update_boid_sprite.rb |  6 ++++++
 app/tick.rb                       |  2 +-
 5 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 app/components/rules/bounds.rb
 create mode 100644 app/systems/rules/bounds.rb

diff --git a/app/components/rules/bounds.rb b/app/components/rules/bounds.rb
new file mode 100644
index 0000000..71495e6
--- /dev/null
+++ b/app/components/rules/bounds.rb
@@ -0,0 +1,5 @@
+
+FF::Cmp.new('BoidBounds',
+            xmax: 1280, xmin: 0,
+            ymax: 720, ymin: 0,
+            strength: 10)
diff --git a/app/main.rb b/app/main.rb
index 972a496..cf31f77 100644
--- a/app/main.rb
+++ b/app/main.rb
@@ -4,8 +4,10 @@ require 'app/scenes/scenes.rb'
 
 require 'app/components/sprite.rb'
 require 'app/components/boid.rb'
+require 'app/components/rules/bounds.rb'
 
 require 'app/systems/render.rb'
 require 'app/systems/update_boid_sprite.rb'
+require 'app/systems/rules/bounds.rb'
 
 require 'app/tick.rb'
diff --git a/app/systems/rules/bounds.rb b/app/systems/rules/bounds.rb
new file mode 100644
index 0000000..602f19c
--- /dev/null
+++ b/app/systems/rules/bounds.rb
@@ -0,0 +1,20 @@
+FF::Scn::BoidRules.add(
+  FF::Sys.new('BoidBounds') do
+    FF::Cmp::BoidBounds.each do |boid_bounds|
+      boid = boid_bounds.entities[0].components[FF::Cmp::Boid][0]
+
+      if boid.x > boid_bounds.xmax
+        boid.cx -= boid_bounds.strength
+      elsif boid.x < boid_bounds.xmin
+        boid.cx += boid_bounds.strength
+      end
+
+      if boid.y > boid_bounds.ymax
+        boid.cy -= boid_bounds.strength
+      elsif boid.y < boid_bounds.ymin
+        boid.cy += boid_bounds.strength
+      end
+    end
+  end
+)
+
diff --git a/app/systems/update_boid_sprite.rb b/app/systems/update_boid_sprite.rb
index d600fa6..57d5847 100644
--- a/app/systems/update_boid_sprite.rb
+++ b/app/systems/update_boid_sprite.rb
@@ -1,9 +1,15 @@
 FF::Scn::Render.add(
   FF::Sys.new('UpdateBoidSprite', priority: 98) do
     FF::Cmp::Boid.each do |boid|
+      boid.vx += boid.cx
+      boid.vy += boid.cy
+      boid.x += boid.vx
+      boid.y += boid.vy
       boid.entities[0].components[FF::Cmp::Sprite][0].props[:x] = boid.x
       boid.entities[0].components[FF::Cmp::Sprite][0].props[:y] = boid.y
       # based on direction of the vector, needs to update the rotation of sprite too
+      boid.cx = 0
+      boid.cy = 0
     end
   end
 )
diff --git a/app/tick.rb b/app/tick.rb
index a528a22..b8910f4 100644
--- a/app/tick.rb
+++ b/app/tick.rb
@@ -1,4 +1,4 @@
-FF::Ent.new(FF::Cmp::Sprite.new, FF::Cmp::Boid.new)
+FF::Ent.new(FF::Cmp::Sprite.new, FF::Cmp::Boid.new(vx: 10, vy: 10), FF::Cmp::BoidBounds.new)
 def tick args
   FelFlame::Stage.call
 end
-- 
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