Module: Lotu::SteeringSystem::UserMethods

Defined in:
lib/lotu/systems/steering_system.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.extended(instance) ⇒ Object 



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# File 'lib/lotu/systems/steering_system.rb', line 179

def self.extended(instance)
  instance.setup_steering
end

Instance Method Details

#activate(behavior) ⇒ Object 



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# File 'lib/lotu/systems/steering_system.rb', line 211

def activate(behavior)
  @systems[SteeringSystem].activate(behavior)
end

#distance_to_target ⇒ Object 



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# File 'lib/lotu/systems/steering_system.rb', line 215

def distance_to_target
  (@target - @pos).length
end

#draw_debug ⇒ Object 



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# File 'lib/lotu/systems/steering_system.rb', line 223

def draw_debug
  super
  $lotu.draw_line(0, 0, @colors[:position], @pos.x, @pos.y, @colors[:position])
  $lotu.draw_line(@pos.x, @pos.y, @colors[:heading], (@pos + @heading*50).x, (@pos+@heading*50).y, @colors[:heading])
  $lotu.draw_line(@pos.x, @pos.y, @colors[:target], @target.x, @target.y, @colors[:target]) if @target
end

#facing_target? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lotu/systems/steering_system.rb', line 219

def facing_target?
  @heading.facing_to?(@target - @pos)
end

#setup_steering ⇒ Object 



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# File 'lib/lotu/systems/steering_system.rb', line 183

def setup_steering
  # Create accessors for the user
  class << self
    attr_accessor :mass, :pos, :heading, :vel, :accel,
    :max_speed, :max_turn_rate, :max_force,
    :wander_radius, :wander_distance, :wander_target,
    :target, :evader, :pursuer, :pursuers
  end

  # TODO: move these inside the SteeringSystem?
  # and just delegate with accessors?
  # Some defaults
  @pos = Vector2d.new(@x, @y)
  offset_x = Gosu.offset_x(@angle, 1)
  offset_y = Gosu.offset_y(@angle, 1)
  @heading = Vector2d.new(offset_x, offset_y)
  @vel = Vector2d.new
  @accel = Vector2d.new
  @wander_target = Vector2d.new
  @pursuers = []

  @colors = {
    :position => 0xff666666,
    :heading => 0xffff0000,
    :target => rand_color
  }
end

#to_s ⇒ Object

to_s utility methods



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# File 'lib/lotu/systems/steering_system.rb', line 231

def to_s
  ["@angle(#{format('%.2f', @angle)}°)",
   "@pos(#{@pos})",
   "@heading(#{@heading})",
   "@vel |#{format('%.2f', @vel.length)}| (#{@vel})",
   "@accel |#{format('%.2f', @accel.length)}| (#{@accel})",
   "facing_target? #{facing_target? if @target}",
   "angle_to(@target) #{format('%.2f', @heading.angle_to(@target - @pos)) if @target}",
   "@seek_target(#{@target})"]
end