Class: AuthorEngine::CollisionDetection

Inherits:
Object
  • Object
show all
Defined in:
lib/author_engine/collision_detection/collision_detection.rb

Defined Under Namespace

Classes: BoundingBox, Color

Instance Method Summary collapse

Constructor Details

#initialize(game_sprites, game_levels, spritesheet) ⇒ CollisionDetection

Returns a new instance of CollisionDetection.



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 6

def initialize(game_sprites, game_levels, spritesheet)
  @game_sprites = game_sprites
  @game_levels  = game_levels

  @sprites= []
  @levels = []

  @known_collisions = []

  spritesheet_blob = RUBY_ENGINE == "opal" ? spritesheet.to_blob.each_slice(4).to_a : spritesheet.to_blob.bytes.each_slice(4).to_a
  (spritesheet.rows / 16).times do |y|
    (spritesheet.columns / 16).times do |x|
      blob = []

      16.times do |sy|
        16.times do |sx|
          blob << spritesheet_blob[(y * 16 + sy) * spritesheet.columns + (x * 16 + sx)]
        end
      end

      add_sprite(blob.flatten!)
    end
  end

  @game_levels.each { |level| add_level(level) }
end

Instance Method Details

#add_level(level_array) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 41

def add_level(level_array)
  @levels << level_array # TODO: Put level's into an optimized structure for fast quadrant look-ups
end

#add_sprite(blob) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 37

def add_sprite(blob)
  @sprites << {blob: blob, box: bounding_box(blob)}
end

#box(sprite_index) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 45

def box(sprite_index)
  @sprites[sprite_index][:box]
end

#clear ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 33

def clear
  @known_collisions.clear
end

#colliding_edge(sprite_index, sprite_x, sprite_y, target_sprite_index, target_x, target_y) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 66

def colliding_edge(sprite_index, sprite_x, sprite_y, target_sprite_index, target_x, target_y)
  sprite_box = box(sprite_index)
  target_box = box(target_sprite_index)

  edges = {top: false, left: false, right: false, bottom: false}

  # https://gamedev.stackexchange.com/a/24091
  wy = (sprite_box.width + target_box.width) * ((sprite_y - sprite_box.height) - (target_y - target_box.height/2));
  hx = (sprite_box.height + target_box.height) * ((sprite_x - sprite_box.width) - (target_x - target_box.height/2));

  if (wy > hx)
    if (wy > -hx)
      edges[:bottom] = true
    else
      edges[:left] = true
    end
  else
    if (wy > -hx)
      edges[:right] = true
    else
      edges[:top] = true
    end
  end

  return edges
end

#debug_draw_level(level_index) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 97

def debug_draw_level(level_index)
  @levels[level_index].each do |sprite|
    render_bounding_box(sprite.sprite, box(sprite.sprite), sprite.x, sprite.y)
  end
end

#debug_draw_sprite(sprite_index, sprite_x, sprite_y) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 93

def debug_draw_sprite(sprite_index, sprite_x, sprite_y)
  render_bounding_box(sprite_index, box(sprite_index), sprite_x, sprite_y)
end

#render_bounding_box(sprite_index, box, sprite_x, sprite_y, edges = {}, z = Float::INFINITY, color = 0xc800ff00, collision_color = 0xc8ff00ff) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 103

def render_bounding_box(sprite_index, box, sprite_x, sprite_y, edges = {}, z = Float::INFINITY, color = 0xc800ff00, collision_color = 0xc8ff00ff)
  if RUBY_ENGINE == "opal"
    color = "green"
    collision_color = "purple"
  end
  paint_color = color
  # EDGE: TOP
  # TOP LEFT TO TOP RIGHT
  if edges[:top] then paint_color = collision_color; else paint_color = color; end
  draw_line(
    box.x + sprite_x, box.y + sprite_y,
    box.x + sprite_x + box.width, box.y + sprite_y,
    paint_color, z
  )

  # EDGE: RIGHT
  # TOP RIGHT TO BOTTOM RIGHT
  if edges[:right] then paint_color = collision_color; else paint_color = color; end
  draw_line(
    box.x + sprite_x + box.width, box.y + sprite_y,
    box.x + sprite_x + box.width, box.y + sprite_y + box.height,
    paint_color, z
  )

  # EDGE: BOTTOM
  # BOTTOM RIGHT to BOTTOM LEFT
  if edges[:bottom] then paint_color = collision_color; else paint_color = color; end
  draw_line(
    box.x + sprite_x + box.width, box.y + sprite_y + box.height,
    box.x + sprite_x, box.y + sprite_y + box.height,
    paint_color, z
  )

  # EDGE: LEFT
  # BOTTOM LEFT TO TOP LEFT
  if edges[:left] then paint_color = collision_color; else paint_color = color; end
  draw_line(
    box.x + sprite_x, box.y + sprite_y + box.height,
    box.x + sprite_x, box.y + sprite_y,
    paint_color, z
  )
end

#sprite_vs_level(sprite_index, sprite_x, sprite_y, level) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 53

def sprite_vs_level(sprite_index, sprite_x, sprite_y, level)
  detected = []

  collider = box(sprite_index)
  @levels[level].each do |sprite|
    if bounding_boxes_intersect?(collider, sprite_x, sprite_y, box(sprite.sprite), sprite.x, sprite.y)
      detected << sprite
    end
  end

  return detected
end

#sprite_vs_sprite(sprite_index, sprite_x, sprite_y, target_sprite_index, target_x, target_y) ⇒ Object 



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# File 'lib/author_engine/collision_detection/collision_detection.rb', line 49

def sprite_vs_sprite(sprite_index, sprite_x, sprite_y, target_sprite_index, target_x, target_y)
  bounding_boxes_intersect?(box(sprite_index), sprite_x, sprite_y, box(target_sprite_index), target_x, target_y)
end