Class: Gingham::PathFinder

Inherits:
Object
  • Object
show all
Defined in:
lib/gingham/path_finder.rb

Class Method Summary collapse

Class Method Details

.find_adjacent_cells(space, cell) ⇒ Object 



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# File 'lib/gingham/path_finder.rb', line 172

def self.find_adjacent_cells(space, cell)
  raise unless space && space.is_a?(Gingham::Space)
  raise unless cell && cell.is_a?(Gingham::Cell)

  adjacent_list = []
  w, d, h = space.width, space.depth, space.height
  x, y, z = cell.x, cell.y, cell.z

  if x + 1 < w
    target_cell = space.cells[x + 1][y][z]
    adjacent_list << target_cell unless target_cell && target_cell.occupied?
  end

  if x - 1 >= 0
    target_cell = space.cells[x - 1][y][z]
    adjacent_list << target_cell unless target_cell && target_cell.occupied?
  end

  if y + 1 < d
    target_cell = space.cells[x][y + 1][z]
    adjacent_list << target_cell unless target_cell && target_cell.occupied?
  end

  if y - 1 >= 0
    target_cell = space.cells[x][y - 1][z]
    adjacent_list << target_cell unless target_cell && target_cell.occupied?
  end

  adjacent_list
end

.find_adjacent_waypoints(space, wp) ⇒ Object 



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# File 'lib/gingham/path_finder.rb', line 153

def self.find_adjacent_waypoints(space, wp)
  raise unless space && space.is_a?(Gingham::Space)
  raise unless wp && wp.is_a?(Gingham::Waypoint)

  adjacent_list = []
  adjacent_cells = Gingham::PathFinder.find_adjacent_cells(space, wp.cell)
  adjacent_cells.each do |cell|
    move_direction = Gingham::Waypoint.detect_direction(wp, cell)
    parent = wp
    if move_direction != wp.direction
      turn_wp = Gingham::Waypoint.new(wp.cell, move_direction, wp)
      parent = turn_wp
    end
    move_to = Gingham::Waypoint.new(cell, move_direction, parent)
    adjacent_list << move_to
  end
  adjacent_list
end

.find_move_path(space, from, to, cost_limit = 999) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/gingham/path_finder.rb', line 4

def find_move_path(space, from, to, cost_limit = 999)
  raise ArgumentError unless space && space.is_a?(Gingham::Space)
  raise ArgumentError unless from && from.is_a?(Gingham::Waypoint) && to && to.is_a?(Gingham::Waypoint)

  open_list = [from]
  return open_list if from.cell == to.cell
  close_list = []
  loop_limit = 0

  while open_list.size > 0 && loop_limit < 1000 do
    current_wp = open_list.first
    close_list << current_wp
    open_list = open_list.drop 1

    adjacent_waypoints = Gingham::PathFinder.find_adjacent_waypoints(space, current_wp)
    adjacent_waypoints.each do |wp|
      if wp.sum_cost < cost_limit
        open_list << wp unless close_list.include? wp
      end
    end
    loop_limit += 1
  end

  shortest_chains = [from]
  end_points = close_list.select{ |closed| closed.cell == to.cell }

  unless end_points.size.zero?
    shortest_cost = 999
    end_points.each do |end_wp|
      if end_wp.sum_cost < shortest_cost
        shortest_cost = end_wp.sum_cost
        shortest_chains = end_wp.chains
      end
    end
  end
  shortest_chains
end

.find_skill_path(space, from, to, max_height = 10) ⇒ Object 



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# File 'lib/gingham/path_finder.rb', line 42

def find_skill_path(space, from, to, max_height = 10)
  path = [from]
  last_wp = path.last
  should_move_y = from.direction == Gingham::Direction::D8 || from.direction == Gingham::Direction::D2

  loop_limit = 0
  while last_wp.cell.x != to.cell.x || last_wp.cell.y != to.cell.y
    loop_limit += 1
    break if loop_limit > 30

    if should_move_y && last_wp.cell.y != to.cell.y
      if last_wp.cell.y < to.cell.y
        if last_wp.cell.y + 1 != space.depth
          height = space.height_at(last_wp.cell.x, last_wp.cell.y + 1)
          cell = space.cells[last_wp.cell.x][last_wp.cell.y + 1][height]
          break unless cell.passable?

          if last_wp.direction == 8
            break if cell.z > max_height
            wp = Gingham::Waypoint.new(cell, 8, last_wp)
            path << wp
            last_wp = wp
          else
            tmp = Gingham::Waypoint.new(last_wp.cell, 8, last_wp)
            path << tmp
            break if cell.z > max_height
            tmp = Gingham::Waypoint.new(cell, 8, tmp)
            path << tmp
            last_wp = tmp
          end
        end
      elsif last_wp.cell.y > to.cell.y
        if last_wp.cell.y - 1 >= 0
          height = space.height_at(last_wp.cell.x, last_wp.cell.y - 1)
          cell = space.cells[last_wp.cell.x][last_wp.cell.y - 1][height]
          break unless cell.passable?

          if last_wp.direction == 2
            break if cell.z > max_height
            wp = Gingham::Waypoint.new(cell, 2, last_wp)
            path << wp
            last_wp = wp
          else
            tmp = Gingham::Waypoint.new(last_wp.cell, 2, last_wp)
            path << tmp
            break if cell.z > max_height
            tmp = Gingham::Waypoint.new(cell, 2, tmp)
            path << tmp
            last_wp = tmp
          end
        end
      end
      should_move_y = false
      next
    else
      should_move_y = false
    end

    if !should_move_y && last_wp.cell.x != to.cell.x
      if last_wp.cell.x < to.cell.x
        if last_wp.cell.x + 1 != space.width
          height = space.height_at(last_wp.cell.x + 1, last_wp.cell.y)
          cell = space.cells[last_wp.cell.x + 1][last_wp.cell.y][height]
          break unless cell.passable?

          if last_wp.direction == 6
            break if cell.z > max_height
            wp = Gingham::Waypoint.new(cell, 6, last_wp)
            path << wp
            last_wp = wp
          else
            tmp = Gingham::Waypoint.new(last_wp.cell, 6, last_wp)
            path << tmp
            break if cell.z > max_height
            tmp = Gingham::Waypoint.new(cell, 6, tmp)
            path << tmp
            last_wp = tmp
          end
        end
      elsif last_wp.cell.x > to.cell.x
        if last_wp.cell.x - 1 >= 0
          height = space.height_at(last_wp.cell.x - 1, last_wp.cell.y)
          cell = space.cells[last_wp.cell.x - 1][last_wp.cell.y][height]
          break unless cell.passable?

          if last_wp.direction == 4
            break if cell.z > max_height
            wp = Gingham::Waypoint.new(cell, 4, last_wp)
            path << wp
            last_wp = wp
          else
            tmp = Gingham::Waypoint.new(last_wp.cell, 4, last_wp)
            path << tmp
            break if cell.z > max_height
            tmp = Gingham::Waypoint.new(cell, 4, tmp)
            path << tmp
            last_wp = tmp
          end
        end
      end
      should_move_y = true
      next
    else
      should_move_y = true
    end
  end

  path.compact
end