Class: GamesParadise::Colliders

Inherits:
Object
  • Object
show all
Defined in:
lib/games_paradise/gui/gosu/final_fantasy/colliders.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(collider_name, buffer, centre_and_top_gap, centre_and_bottom_gap, centre_and_left_gap, centre_and_right_gap) ⇒ Colliders

Returns a new instance of Colliders.



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 14

def initialize(collider_name, buffer, centre_and_top_gap, centre_and_bottom_gap, centre_and_left_gap, centre_and_right_gap)
#collider_name is the name (a string) given to the collider layer in Tiled
#rest of arguments are the size of the gaps required between different parts of a sprite and the colliders
  @collider_name = collider_name
  @buffer = buffer
  @centre_and_top_gap = centre_and_top_gap
  @centre_and_bottom_gap = centre_and_bottom_gap
  @centre_and_left_gap = centre_and_left_gap
  @centre_and_right_gap = centre_and_right_gap
end

Instance Attribute Details

#bottom_collision ⇒ Object (readonly)

Returns the value of attribute bottom_collision.



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 10

def bottom_collision
  @bottom_collision
end

#left_collision ⇒ Object (readonly)

Returns the value of attribute left_collision.



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 11

def left_collision
  @left_collision
end

#right_collision ⇒ Object (readonly)

Returns the value of attribute right_collision.



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 12

def right_collision
  @right_collision
end

#top_collision ⇒ Object (readonly)

Returns the value of attribute top_collision.



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 9

def top_collision
  @top_collision
end

Instance Method Details

#bottom_collision_check(x, y, speed) ⇒ Object 



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 118

def bottom_collision_check(x, y, speed)
  @x = x
  @y = y
  @speed = speed
  player_bottom_and_buffer = y + @centre_and_bottom_gap - @buffer
  player_right = @x + 6
  player_left = @x - 6
  @bottom_collision = false 
  @line_ranges.each do |range|
    x_left = range[:x_range][0]
    x_right = range[:x_range][1]
    y_bottom = range[:y_range][0]
    if (player_left >= x_left) && (player_left <= x_right) && player_bottom_and_buffer < y_bottom && x_left != x_right
      if Gosu.distance(@x,player_bottom_and_buffer + @speed,@x,y_bottom) <= @buffer
        @bottom_collision = true
      end
    end
    if (player_right >= x_left) && (player_right <= x_right) && player_bottom_and_buffer < y_bottom && x_left != x_right
      if Gosu.distance(@x,player_bottom_and_buffer + @speed,@x,y_bottom) <= @buffer
        @bottom_collision = true
      end
    end 

  end

end

#calculate_lines ⇒ Object 



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 25

def calculate_lines
#loads the json map file exported from Tiled, with all its collider layers
file = File.read("map.json")
data_hash = JSON.parse(file)
#locates the array named "objects" within the json file and assigns it. "objects" in the json file contains the coordinates for every point in the colliders
data_hash["layers"].each do |x|
  if x["name"] == "#{@collider_name}"
    @data_from_tiled =  x["objects"]
  end
end
#the coordinates for each point within the json file are relative and not actual. We'll need to adjust them using the origin of each collider

#first we set up an array to collect the points once we've adjusted them
@colliders = []
#this is a temp storage for each point. We'll use it later to pass each point seperately to @colliders
@temp_collider_storage = []
#then we go into the data from the json file and retrieve and assign the origin of each collider 
@data_from_tiled.each do |data|
  polyline_x_origin = data["x"]
  polyline_y_origin = data["y"]
  #then we take every coordinate for each point and adjust it relative to the collider's origin to get its 'true' value
  data["polyline"].each do |polyline_point|
    adjusted_polyline_x = polyline_point["x"] + polyline_x_origin
    adjusted_polyline_y = polyline_point["y"] + polyline_y_origin 
    #then we pass the adjusted coordinates of each point to the temp storage array
    @temp_collider_storage.push ({x: adjusted_polyline_x, y: adjusted_polyline_y})
  end
  #then we pass the adjusted coordinates to @colliders. Doing it like this ensures that each point is passed one at a time, as seperate objects
  @colliders.push @temp_collider_storage
  #this resets the temp storage array so it can be used to collect the next point's adjusted coordinates
  @temp_collider_storage = []
end

#next, we set up an array to pair-up the points of each line that makes up every collider. 
#Each line (like any line) will have two points ie coordinates. The end coordinate of one line will be the starting coordinate of the next line in the collider
@lines = []
#so we take each point...
@colliders.each do |point|
  #...and access each of its coordinates, along with each coordinate's array index (its numercal location in the array)
  point.each_with_index do |coordinate, i|  
    #if the coordinate doesn't have a following coordinate, nothing happens. 
    #Otherwise the coordinate is pushed with its ajacent coordinate into @lines (each pair of coordinates, or points, now represents a line in its collider)
    if point[i + 1].nil?
      0
    else
      next_coordinate = point[i+1]
      @lines.push [coordinate, next_coordinate]
    end
  end
end
#Now we want to work out the 'range' of each line so we can find out if the player will bump into it
#First set up an array to collect the ranges for each line
@line_ranges = []
#Then for each line we extract the two x values and sort them from low to high. Same with y values. Then push to @lines_ranges.
@lines.each do |line|
  x_values_sorted = [line[0][:x], line[1][:x]].sort!
  y_values_sorted = [line[0][:y], line[1][:y]].sort!
  @line_ranges.push ({x_range: x_values_sorted, y_range: y_values_sorted})
end
#@lines_ranges can now be passed to whatever entity needs to know colliders
@line_ranges
end

#left_collision_check(x, y, speed) ⇒ Object 



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 145

def left_collision_check(x, y, speed)
  @x = x
  @y = y
  @speed = speed
  player_top = @y + @centre_and_top_gap
  player_bottom = @y + @centre_and_bottom_gap
  player_right = @x + @centre_and_right_gap
  player_left_and_buffer = @x - @centre_and_left_gap + @buffer
  @left_collision = false 
  @line_ranges.each do |range|
    y_top = range[:y_range][0]
    y_bottom = range[:y_range][1]
    x_left = range[:x_range][0]
    if (player_top >= y_top) && (player_top <= y_bottom) && player_left_and_buffer > x_left && y_top != y_bottom
      if Gosu.distance(player_left_and_buffer - @speed,@y,x_left,@y) <= @buffer
        @left_collision = true
      end
    end
    if (player_bottom >= y_top) && (player_bottom <= y_bottom) && player_left_and_buffer > x_left && y_top != y_bottom
      if Gosu.distance(player_left_and_buffer - @speed,@y,x_left,@y) <= @buffer
        @left_collision = true
      end
    end 
  end
end

#right_collision_check(x, y, speed) ⇒ Object 



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 171

def right_collision_check(x, y, speed)
  @x = x
  @y = y
  @speed = speed
  player_top = @y + @centre_and_top_gap
  player_bottom = @y + @centre_and_bottom_gap
  player_right_and_buffer = @x + @centre_and_right_gap - @buffer
  @right_collision = false 
  @line_ranges.each do |range|
    y_top = range[:y_range][0]
    y_bottom = range[:y_range][1]
    x_right = range[:x_range][1]
    if (player_top >= y_top) && (player_top <= y_bottom) && player_right_and_buffer < x_right && y_top != y_bottom
      if Gosu.distance(player_right_and_buffer + @speed,@y,x_right,@y) <= @buffer
        @right_collision = true
      end
    end
    if (player_bottom >= y_top) && (player_bottom <= y_bottom) && player_right_and_buffer < x_right && y_top != y_bottom
      if Gosu.distance(player_right_and_buffer + @speed,@y,x_right,@y) <= @buffer
        @right_collision = true
      end
    end
  end

end

#top_collision_check(x, y, speed) ⇒ Object 



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# File 'lib/games_paradise/gui/gosu/final_fantasy/colliders.rb', line 88

def top_collision_check(x, y, speed)
  @x = x
  @y = y
  @speed = speed
  player_top_and_buffer = y + @centre_and_top_gap + @buffer
  player_right = @x + 6
  player_left = @x - 6
  #at the start of every check, we assume there is no collision
  @top_collision = false
  #Then we look to see if we are within the x values in all the lines (colliders) we have. 
  @line_ranges.each do |range|
    x_left = range[:x_range][0]
    x_right = range[:x_range][1]
    y_top = range[:y_range][0]
    #if we are within x range, then check to see we are below the line (as that's the only way we can top collide with it)
    # I've used '&& x_left != x_right' to exclude vertical lines
    if (player_left >= x_left) && (player_left <= x_right) && player_top_and_buffer > y_top && x_left != x_right
      if Gosu.distance(@x,player_top_and_buffer - @speed,@x,y_top) <= @buffer  
        @top_collision = true
      end
    end
    if (player_right >= x_left) && (player_right <= x_right) && player_top_and_buffer > y_top && x_left != x_right
      if Gosu.distance(@x,player_top_and_buffer - @speed,@x,y_top) <= @buffer
        @top_collision = true
      end
    end 
  end
  @top_collision
end