336 lines
8.9 KiB
Lua
336 lines
8.9 KiB
Lua
local cavern = {}
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local tiletypes = {unknown = 0, empty = 1, wall = 2}
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local spawn_x = nil
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local spawn_y = nil
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local directions = {up = 0, upleft = 1, left = 2, downleft = 3, down = 4, downright = 5, right = 6, upright = 7}
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local player_x = nil
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local player_y = nil
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local player_direction = nil
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-- ------------------------------------------------------------------
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-- Cavern generation
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-- ------------------------------------------------------------------
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function generateCavern()
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repeat
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cavern = {}
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cavern.width = 80
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cavern.height = 60
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-- Create a cavern.width × cavern.height array filled with tiletypes.unknown
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for x = 1, cavern.width do
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local list = {}
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for y = 1, cavern.height do
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table.insert(list, tiletypes.unknown)
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end
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table.insert(cavern, list)
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end
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-- Fill top and bottom edges with walls
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for x = 1, cavern.width do
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cavern[x][1] = tiletypes.wall
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cavern[x][cavern.height] = tiletypes.wall
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end
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-- Fill the left and right edges with walls
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for y = 1, cavern.height do
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cavern[1][y] = tiletypes.wall
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cavern[cavern.width][y] = tiletypes.wall
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end
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local queue = {}
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local size = 1
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-- Limit spawn to locations not on the edge walls
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spawn_x = math.random(2, cavern.width - 1)
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spawn_y = math.random(2, cavern.height - 1)
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cavern[spawn_x][spawn_y] = tiletypes.empty
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table.insert(queue, {x = spawn_x, y = spawn_y - 1})
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table.insert(queue, {x = spawn_x, y = spawn_y + 1})
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table.insert(queue, {x = spawn_x - 1, y = spawn_y})
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table.insert(queue, {x = spawn_x + 1, y = spawn_y})
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repeat
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queue, size = stepTilesGeneration(queue, size)
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until #queue == 0
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until size > 200
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end
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function stepTilesGeneration(queue, size)
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-- Tuning this parameter will change how open and cavernous vs. closed and corridory the
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-- cavern will be
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local spread_probability = 0.6
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local new_queue = {}
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local new_size = size
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for i, location in ipairs(queue) do
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if cavern[location.x][location.y] == tiletypes.unknown then
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-- We haven't covered this tile yet
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if math.random() < spread_probability then
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-- Empty
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cavern[location.x][location.y] = tiletypes.empty
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size = size + 1
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-- Up
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if location.y - 1 >= 1 then
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table.insert(new_queue, {x = location.x, y = location.y - 1})
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end
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-- Down
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if location.y + 1 <= cavern.height then
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table.insert(new_queue, {x = location.x, y = location.y + 1})
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end
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-- Left
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if location.x - 1 >= 1 then
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table.insert(new_queue, {x = location.x - 1, y = location.y})
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end
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-- Right
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if location.x + 1 <= cavern.width then
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table.insert(new_queue, {x = location.x + 1, y = location.y})
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end
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else
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-- Wall
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cavern[location.x][location.y] = tiletypes.wall
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end
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end
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end
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return new_queue, size
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end
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-- ------------------------------------------------------------------
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-- Spawning objects
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-- ------------------------------------------------------------------
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function spawnPlayer()
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player_x = spawn_x
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player_y = spawn_y
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-- Check what direction we can spawn the player
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if cavern[player_x][player_y + 1] == tiletypes.empty then
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-- There's space under, spawn facing up
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player_direction = directions.up
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elseif cavern[player_x + 1][player_y] == tiletypes.empty then
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-- There's space to the right, spawn facing left
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player_direction = directions.left
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elseif cavern[player_x - 1][player_y] == tiletypes.empty then
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-- There's space to the left, spawn facing right
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player_direction = directions.right
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elseif cavern[player_x][player_y - 1] == tiletypes.empty then
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-- There's space above, spawn facing down
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player_direction = directions.down
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else
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error("Cavern is weirdly generated and player cannot spawn")
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end
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end
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-- ------------------------------------------------------------------
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-- Player helper functions
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-- ------------------------------------------------------------------
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function getBodyLocation(x, y, facing)
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if x == nil then x = player_x end
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if y == nil then y = player_y end
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if facing == nil then facing = player_direction end
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if facing == directions.up then
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-- Facing up, body is down
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return x, y + 1
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elseif facing == directions.left then
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-- Facing left, body is right
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return x + 1, y
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elseif facing == directions.down then
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-- Facing down, body is up
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return x, y - 1
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elseif facing == directions.right then
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-- Facing right, body is left
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return x - 1, y
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else
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error("Player facing an impossible direction")
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end
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end
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function movePlayer(direction)
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local dx = 0
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local dy = 0
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local new_direction = direction
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-- If we are moving backwards, keep the old direction of facing
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if player_direction == directions.up and direction == directions.down or
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player_direction == directions.down and direction == directions.up or
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player_direction == directions.left and direction == directions.right or
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player_direction == directions.right and direction == directions.left then
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new_direction = player_direction
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end
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if direction == directions.up then
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dy = -1
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elseif direction == directions.down then
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dy = 1
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elseif direction == directions.left then
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dx = -1
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elseif direction == directions.right then
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dx = 1
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elseif direction == directions.upleft then
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if player_direction == directions.down then
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-- ## ##
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-- x# xo#
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-- #o# # #
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dy = -1
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new_direction = directions.right
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elseif player_direction == directions.right then
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-- # # #x#
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-- #xo #o
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-- ## ##
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dx = -1
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new_direction = directions.down
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else
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new_direction = player_direction
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end
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elseif direction == directions.downleft then
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if player_direction == directions.up then
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-- #o# # #
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-- x# xo#
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-- ## ##
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dy = 1
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new_direction = directions.right
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elseif player_direction == directions.right then
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-- ## ##
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-- #xo #o
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-- # # #x#
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dx = -1
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new_direction = directions.up
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else
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new_direction = player_direction
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end
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elseif direction == directions.downright then
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if player_direction == directions.up then
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-- #o# # #
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-- #x #ox
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-- ## ##
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dy = 1
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new_direction = directions.left
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elseif player_direction == directions.left then
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-- ## ##
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-- ox# o#
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-- # # #x#
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dx = 1
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new_direction = directions.up
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else
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new_direction = player_direction
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end
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elseif direction == directions.upright then
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if player_direction == directions.down then
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-- ## ##
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-- #x #ox
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-- #o# # #
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dy = -1
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new_direction = directions.left
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elseif player_direction == directions.left then
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-- # # #x#
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-- ox# o#
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-- ## ##
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dx = 1
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new_direction = directions.down
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else
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new_direction = player_direction
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end
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else
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error("Player moving in an impossible direction")
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end
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local body_x, body_y = getBodyLocation(player_x + dx, player_y + dy, new_direction)
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if cavern[player_x + dx][player_y + dy] == tiletypes.empty and
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cavern[body_x][body_y] == tiletypes.empty then
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player_x = player_x + dx
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player_y = player_y + dy
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player_direction = new_direction
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end
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end
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-- ------------------------------------------------------------------
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-- Callbacks
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-- ------------------------------------------------------------------
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function love.load()
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math.randomseed(os.time())
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generateCavern()
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spawnPlayer()
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end
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function love.update(dt)
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end
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function love.keypressed(key)
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if key == 'r' then
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generateCavern()
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spawnPlayer()
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elseif key == 'i' then
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movePlayer(directions.up)
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elseif key == 'j' then
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movePlayer(directions.left)
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elseif key == 'k' then
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movePlayer(directions.down)
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elseif key == 'l' then
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movePlayer(directions.right)
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elseif key == 'u' then
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movePlayer(directions.upleft)
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elseif key == 'm' then
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movePlayer(directions.downleft)
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elseif key == '.' then
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movePlayer(directions.downright)
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elseif key == 'o' then
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movePlayer(directions.upright)
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elseif key == 'q' then
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love.event.quit()
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else
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display_inputinfo_counter = 1
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end
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end
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function love.draw()
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local x_scale = love.graphics.getWidth() / cavern.width
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local y_scale = love.graphics.getHeight() / cavern.height
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-- Draw the cavern
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for tile_x, list in ipairs(cavern) do
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local x = (tile_x - 1) * x_scale
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for tile_y, tile in ipairs(list) do
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local y = (tile_y - 1) * y_scale
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if tile == tiletypes.empty then
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love.graphics.setColor(0, 0, 0)
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elseif tile == tiletypes.wall then
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love.graphics.setColor(1, 1, 1)
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else
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love.graphics.setColor(1, 0.5, 0.5)
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end
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love.graphics.rectangle('fill', x, y, x_scale, y_scale)
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end
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end
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-- Draw the player
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local player_head_center_x = (player_x - 1) * x_scale + 0.5 * x_scale
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local player_head_center_y = (player_y - 1) * y_scale + 0.5 * y_scale
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love.graphics.setColor(0.7, 0.3, 0.3)
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love.graphics.ellipse('fill', player_head_center_x, player_head_center_y, x_scale/2, y_scale/2)
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local player_body_x, player_body_y = getBodyLocation()
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local player_body_x = (player_body_x - 1) * x_scale
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local player_body_y = (player_body_y - 1) * y_scale
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love.graphics.setColor(0, 0, 1)
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love.graphics.rectangle('fill', player_body_x, player_body_y, x_scale, y_scale)
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end
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