Add turn_radius to Hunt.

lib/warp_defender/behaviors/hunt.rb

@@ -3,8 +3,10 @@ module Behaviors
   class Hunt < Behavior
     attr_reader :velocity
 
-    def initialize(entity)
+    def initialize(entity, options = {})
       super(entity)
+
+      @turn_radius = options[:turn_radius] || 1.0
       # distance per second to move
       @velocity = Gosu::random(80, 200)
     end
@@ -17,10 +19,23 @@ def position
     end
 
     def angle
-      distance_x = (@entity.target.x - @entity.x)
-      distance_y = (@entity.target.y - @entity.y)
-
-      Math.atan2(distance_y, distance_x).radians_to_gosu
+      distance_x = @entity.target.x - @entity.x
+      distance_y = @entity.target.y - @entity.y
+
+      optimum_angle = Math.atan2(distance_y, distance_x).radians_to_gosu
+
+      diff = Gosu::angle_diff(@entity.angle, optimum_angle)
+
+      if diff > 1.0 
+        turn_radius = diff < @turn_radius ? diff : @turn_radius
+        @entity.angle + turn_radius
+
+      elsif diff < -1.0
+        turn_radius = diff.abs < @turn_radius ? diff.abs : @turn_radius
+        @entity.angle - turn_radius
+      else
+        @entity.angle
+      end
     end
 
   end

lib/warp_defender/entities/grunt.rb

@@ -8,7 +8,7 @@ def initialize(target)
             :sprite => "grunt",
             :physics => :dynamic)
 
-      @behavior = Behaviors::Hunt.new(self)
+      @behavior = Behaviors::Hunt.new(self, :turn_radius => 10.0)
       @target = target
 
       @render.state = "idle"

lib/warp_defender/entities/projectiles/projectile.rb

@@ -3,10 +3,10 @@ module Entities
   module Projectiles
 
     class Projectile < Entity
-      def initialize(options)
+      def initialize(options = {})
         super(options)
 
-        @behavior = Behaviors::Hunt.new(self)
+        @behavior = Behaviors::Hunt.new(self, :turn_radius => 2.0)
         @render.state = "idle"
       end
 

lib/warp_defender/entities/projectiles/rocket.rb

@@ -12,7 +12,7 @@ def initialize(angle, x, y, vel_x, vel_y)
               :physics => :dynamic,
               :friction => 0)
         @render.state = "idle"
-        @behavior = Behaviors::Homing.new(self)
+        @behavior = Behaviors::Hunt.new(self, :turn_radius => 3.0)
         @target = nil
         @detection_range = 500
       end