Class: GamesParadise::ParticleSimulator::Simulation

Inherits:
Gosu::Window
  • Object
show all
Defined in:
lib/games_paradise/gui/gosu/particle_simulator/main.rb

Instance Method Summary collapse

Methods inherited from Gosu::Window

#gosu_button_down?, #image, #image10?, #image1?, #image2?, #image3?, #image4?, #image5?, #image6?, #image7?, #image8?, #image9?, #on_left_arrow_pressed?, #on_right_arrow_pressed?, #q_means_quit, #set_font, #set_title, #sqrt, #tab_key?, #write_this_text

Constructor Details

#initialize ⇒ Simulation

#

initialize

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 29

def initialize
  super(WIDTH, HEIGHT, false)
  self.caption = 'Who Let the Dogs Out?'
  @prev_time = Gosu.milliseconds
  @font = Gosu::Font.new(self, Gosu.default_font_name, 15)
  reset
  resimulate
end

Instance Method Details

#button_down(id) ⇒ Object

#

button_down

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 104

def button_down(id)
  close if id == Button::KbEscape
  if id == Button::KbD
    @font_color.alpha = (@font_color.alpha == 0) ? 150 : 0
  end
  if id == Button::KbSpace
    @timer = 0
    resimulate
  end
end

#do_collision(h1, h2) ⇒ Object

#

do_collision

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 147

def do_collision(h1, h2)
  return if Gosu.distance(h1.x, h1.y, h2.x, h2.y) > 2 * H_RADIUS

  # ======================================================================= #
  # This math is from http://www.plasmaphysics.org.uk/programs/coll2d_cpp.htm
  # hunters bounce off one another.
  # ======================================================================= #
  x21 = h2.x - h1.x
  y21 = h2.y - h1.y
  
  vx21 = h2.vx - h1.vx
  vy21 = h2.vy - h1.vy
  
  # ======================================================================= #
  # return if balls are not approaching
  # ======================================================================= #
  return if vx21*x21 + vy21*y21 >= 0
  
  a = y21 / x21
  dvx2 = -(vx21 + a*vy21)/(1 + a*a)
  advx2 = a*dvx2
  h2.vx += dvx2
  h2.vy += advx2
  h1.vx -= dvx2
  h1.vy -= advx2
end

#draw ⇒ Object

#

draw

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 96

def draw
  (@hunters + @preys).each {|x| x.draw}
  draw_scoreboard
end

#draw_scoreboard ⇒ Object

#

draw_scoreboard

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 177

def draw_scoreboard
  avg_text = (((@avg.to_f/6.0).round)/10.0).to_s + 'sec'
  cur_text = (((@timer.to_f/6.0).round)/10.0).to_s + 'sec'
  last_text = (((@last.to_f/6.0).round)/10.0).to_s + 'sec'
  runs_text = @runs.to_s
  remaining_text = @preys.size.to_s
  display = "AVG: #{avg_text}, CUR: #{cur_text}, LAST: #{last_text}, RUNS: #{runs_text}, REMAIN: #{remaining_text}"
  @font.draw_text(display, 10, 10, 3, 1, 1, @font_color)
end

#draw_square(x, y, r, color) ⇒ Object

#

draw_square

draws a square at x,y with radius r

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 137

def draw_square(x, y, r, color)
  draw_quad(x + r, y + r, color,
            x - r, y + r, color,
            x + r, y - r, color,
            x - r, y - r, color)
end

#get_avg(array) ⇒ Object

#

get_avg

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 190

def get_avg(array)
  return if array.empty?
  avg = 0
  array.each {|i| avg += i }
  avg /= array.size
  return avg
end

#reset ⇒ Object

#

reset (reset tag)

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 41

def reset
  # ======================================================================= #
  # === @accum_fps
  #
  # FPS calculation logic taken from AsyncTest.rb that comes with Gosu.
  # ======================================================================= #
  @accum_fps = 0
  # ======================================================================= #
  # === @timer
  # ======================================================================= #
  @timer = 0
  # ======================================================================= #
  # === @font_color
  # ======================================================================= #
  @font_color = Gosu::Color.new(150, 255, 255, 255)
  # ======================================================================= #
  # === @times
  # ======================================================================= #
  @times = []
  @avg   = 0
  @last  = 0
  @runs  = 0
end

#resimulate ⇒ Object

#

resimulate

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 118

def resimulate
  if @timer != 0
    @times << @timer
    @last = @times.last
    @runs += 1
  end
  @avg = get_avg(@times)
  @timer = 0
  @hunters = [0xffff0000, 0xffffffff, 0xff0000ff, 0xffffff00, 0xff00ffff].map do |c|
    Hunter.new(self, c)
  end
  @preys = Array.new(100) {Prey.new(self)}
end

#update ⇒ Object

#

update

#


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# File 'lib/games_paradise/gui/gosu/particle_simulator/main.rb', line 68

def update
  @cur_sec ||= 0
  @accum_fps += 1
  now = Gosu.milliseconds
  if @cur_sec != now / 1000
    @cur_sec = now / 1000
    self.caption = "Who Let the Dogs Out? FPS: #{@accum_fps}"
    @accum_fps = 0
  end
  @timer += 1 # one frame gone at 60 fps
  
  (0...4).each { |i|
    (i+1...5).each { |j|
      do_collision(@hunters[i], @hunters[j])
    }
  }

  if !@preys.empty?
    @hunters.each {|h| h.update(@preys)}
    @preys.reject! {|p| !p.update(@hunters)}
  else
    resimulate
  end
end