From 501ec02e894865836f2960b0bbc16b3448e3707f Mon Sep 17 00:00:00 2001
From: realtradam <mr.malczewski@gmail.com>
Date: Mon, 9 Aug 2021 09:15:38 -0400
Subject: ruboids!

---
 lib/rules/alignment.rb  | 20 ++++++++++++++++++++
 lib/rules/bounds.rb     | 15 +++++++++++++++
 lib/rules/cohesion.rb   | 21 +++++++++++++++++++++
 lib/rules/limit.rb      | 13 +++++++++++++
 lib/rules/seperation.rb | 14 ++++++++++++++
 lib/rules/target.rb     |  6 ++++++
 6 files changed, 89 insertions(+)
 create mode 100644 lib/rules/alignment.rb
 create mode 100644 lib/rules/bounds.rb
 create mode 100644 lib/rules/cohesion.rb
 create mode 100644 lib/rules/limit.rb
 create mode 100644 lib/rules/seperation.rb
 create mode 100644 lib/rules/target.rb

(limited to 'lib/rules')

diff --git a/lib/rules/alignment.rb b/lib/rules/alignment.rb
new file mode 100644
index 0000000..b30683c
--- /dev/null
+++ b/lib/rules/alignment.rb
@@ -0,0 +1,20 @@
+FF::Sys.new('Alignment', priority: 50) do
+  group_velocity = [0.0,0.0]
+  boids_count = FF::Cmp::Boids.each.to_a.count
+
+  FF::Cmp::Boids.each do |boid|
+    group_velocity[0] += boid.vx
+    group_velocity[1] += boid.vy
+  end
+
+  FF::Cmp::Boids.each do |boid_update|
+    move_boid = group_velocity.dup
+    move_boid[0] -= boid_update.vx
+    move_boid[1] -= boid_update.vy
+    move_boid[0] /= boids_count - 1.0
+    move_boid[1] /= boids_count - 1.0
+
+    boid_update.cx += (move_boid[0] - boid_update.vx) / $alignment
+    boid_update.cy += (move_boid[1] - boid_update.vy) / $alignment
+  end
+end
diff --git a/lib/rules/bounds.rb b/lib/rules/bounds.rb
new file mode 100644
index 0000000..5045d60
--- /dev/null
+++ b/lib/rules/bounds.rb
@@ -0,0 +1,15 @@
+FF::Sys.new('Bounds', priority: 50) do
+  FF::Cmp::Boids.each do |boid|
+    if boid.x > $config.xmax
+      boid.cx -= $config.bounds_strength
+    elsif boid.x < $config.xmin
+      boid.cx += $config.bounds_strength
+    end
+
+    if boid.y > $config.ymax
+      boid.cy -= $config.bounds_strength
+    elsif boid.y < $config.ymin
+      boid.cy += $config.bounds_strength
+    end
+  end
+end
diff --git a/lib/rules/cohesion.rb b/lib/rules/cohesion.rb
new file mode 100644
index 0000000..efbd71d
--- /dev/null
+++ b/lib/rules/cohesion.rb
@@ -0,0 +1,21 @@
+FF::Sys.new('Cohesion', priority: 50) do
+
+  center_mass = [0.0,0.0]
+  boids_count = FF::Cmp::Boids.each.to_a.count
+
+  FF::Cmp::Boids.each do |boid|
+    center_mass[0] += boid.x
+    center_mass[1] += boid.y
+  end
+
+  FF::Cmp::Boids.each do |boid_update|
+    move_boid = center_mass.dup
+    move_boid[0] -= boid_update.x
+    move_boid[1] -= boid_update.y
+    move_boid[0] /= boids_count - 1.0
+    move_boid[1] /= boids_count - 1.0
+
+    boid_update.cx += (move_boid[0] - boid_update.x) / $cohesion
+    boid_update.cy += (move_boid[1] - boid_update.y) / $cohesion
+  end
+end
diff --git a/lib/rules/limit.rb b/lib/rules/limit.rb
new file mode 100644
index 0000000..c454de4
--- /dev/null
+++ b/lib/rules/limit.rb
@@ -0,0 +1,13 @@
+# This special function is already called by apply_boid_calculations.rb
+# do not add or call this function elsewhere
+FF::Sys.new('Limit') do
+  unless $limit < 0
+    FF::Cmp::Boids.each do |boid|
+      absolute_velocity = Math.sqrt((boid.vx**2) + (boid.vy**2))
+      if absolute_velocity > $limit
+        boid.vx = (boid.vx / absolute_velocity) * $limit
+        boid.vy = (boid.vy / absolute_velocity) * $limit
+      end
+    end
+  end
+end
diff --git a/lib/rules/seperation.rb b/lib/rules/seperation.rb
new file mode 100644
index 0000000..31039f3
--- /dev/null
+++ b/lib/rules/seperation.rb
@@ -0,0 +1,14 @@
+FF::Sys.new('Seperation', priority: 50) do
+  FF::Cmp::Boids.each do |boid_update|
+    newvec = [0.0,0.0]
+    FF::Cmp::Boids.each do |boid_check|
+      next if boid_check == boid_update
+      if Math.sqrt(((-boid_check.x + boid_update.x)**2) + ((-boid_check.y + boid_update.y)**2)).abs < $seperation_distance
+        newvec[0] -= boid_check.x - boid_update.x 
+        newvec[1] -= boid_check.y - boid_update.y 
+      end
+    end
+    boid_update.cx += newvec[0] / $seperation
+    boid_update.cy += newvec[1] / $seperation
+  end
+end
diff --git a/lib/rules/target.rb b/lib/rules/target.rb
new file mode 100644
index 0000000..ffee93a
--- /dev/null
+++ b/lib/rules/target.rb
@@ -0,0 +1,6 @@
+FF::Sys.new('Target', priority: 50) do
+  FF::Cmp::Boids.each do |boid|
+    boid.cx += ($x_target - boid.x) / $target_strength
+    boid.cy += ($y_target - boid.y) / $target_strength
+  end
+end
-- 
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