479 lines
12 KiB
Lua
479 lines
12 KiB
Lua
local paddle_x = nil
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local paddle_y = nil
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local paddle_width = 0.1
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local paddle_height = 0.02
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local wall_thickness = 0.01
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local missiles = nil
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local missile_radius = 0.005
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local missile_trail_fade = 0.4
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local missile_trail_min_visibility = 0.03
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local missile_trail_length = math.log(missile_trail_min_visibility, missile_trail_fade)
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local missile_speed_min = 0.15
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local missile_speed_max = 0.25
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local unreflected_missiles = nil
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local unreflected_missiles_allowed = nil
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local unreflected_missiles_allowed_ramp_up = 10
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local unreflected_missiles_max = 7
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local cities = nil
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local city_radius = 0.05
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local explosions = nil
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local explosion_radius = 0.08
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local explosion_duration = 0.4
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local enemies = nil
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local enemy_radius = 0.025
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local enemy_min_shoot = 2
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local enemy_max_shoot = 10
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local enemy_inaccuracy = 0.05
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local window_width = nil
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local window_height = nil
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local viewport_x_offset = nil
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local viewport_y_offset = nil
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local scale = nil
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local time = nil
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function setScreenDimensions(width, height)
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window_width = width
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window_height = height
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viewport_x_offset = 0
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viewport_y_offset = 0
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scale = math.min(width, height)
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viewport_x_offset = (window_width - scale) / 2
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viewport_y_offset = (window_height - scale) / 2
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end
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function toScreenCoordinates(x, y)
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local screen_x = x * scale + viewport_x_offset
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local screen_y = y * scale + viewport_y_offset
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return screen_x, screen_y
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end
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function toScreenSize(size)
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return size * scale
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end
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function fromScreenCoordinate(x, y)
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local logical_x = (x - viewport_x_offset) / scale
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local logical_y = (y - viewport_y_offset) / scale
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return logical_x, logical_y
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end
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function initialize()
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missiles = {}
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unreflected_missiles = 0
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unreflected_missiles_allowed = 0
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cities = {}
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explosions = {}
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enemies = {}
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time = 0
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spawnCities()
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spawnEnemy(0.1, 0.1)
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spawnEnemy(0.2, 0.1)
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spawnEnemy(0.3, 0.1)
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spawnEnemy(0.4, 0.1)
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spawnEnemy(0.5, 0.1)
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spawnEnemy(0.6, 0.1)
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spawnEnemy(0.7, 0.1)
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spawnEnemy(0.8, 0.1)
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spawnEnemy(0.9, 0.1)
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spawnEnemy(0.15, 0.2)
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spawnEnemy(0.25, 0.2)
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spawnEnemy(0.35, 0.2)
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spawnEnemy(0.45, 0.2)
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spawnEnemy(0.55, 0.2)
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spawnEnemy(0.65, 0.2)
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spawnEnemy(0.75, 0.2)
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spawnEnemy(0.85, 0.2)
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end
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function love.load()
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math.randomseed(os.time())
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love.mouse.setVisible(false)
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local width, height = love.graphics.getDimensions()
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setScreenDimensions(width, height)
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movePaddle(0)
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initialize()
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end
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function spawnCities()
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local number_of_cities = 7
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cities = {}
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for i = 1, number_of_cities do
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local city_x = ((i - 0.5) / number_of_cities) * (1 - 2*wall_thickness) + wall_thickness
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local city_y = 1
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table.insert(cities, {
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x = city_x,
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y = city_y,
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alive = true
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})
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end
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end
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function spawnMissile(x, y, target_x, target_y, speed)
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local dx = target_x - x
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local dy = target_y - y
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local length = math.sqrt(dx * dx + dy * dy)
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local dx = dx / length * speed
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local dy = dy / length * speed
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table.insert(missiles, {
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x = x,
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y = y,
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dx = dx,
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dy = dy,
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reflected = false,
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history = {
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{x = x, y = y}
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},
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trail_length = 0,
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alive = true
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})
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unreflected_missiles = unreflected_missiles + 1
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end
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function spawnExplosion(x, y)
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table.insert(explosions, {
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x = x,
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y = y,
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radius = 0,
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remaining = explosion_duration,
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})
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end
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function spawnEnemy(x, y)
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table.insert(enemies, {
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x = x,
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y = y,
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until_shoot = enemy_min_shoot + math.random() * (enemy_max_shoot - enemy_min_shoot),
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angle = math.random() * 2 * math.pi,
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alive = true
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})
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end
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function updateMissiles(dt)
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for _, missile in ipairs(missiles) do
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missile.x = missile.x + missile.dx * dt
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missile.y = missile.y + missile.dy * dt
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if missile.y < wall_thickness + missile_radius then
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-- Collision with top wall
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missile.y = wall_thickness + missile_radius
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missile.dy = -missile.dy
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end
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if missile.x < wall_thickness + missile_radius then
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-- Collision with left wall
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missile.x = wall_thickness + missile_radius
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missile.dx = -missile.dx
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elseif missile.x > 1 - (wall_thickness + missile_radius) then
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-- Collision with right wall
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missile.x = 1 - (wall_thickness + missile_radius)
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missile.dx = -missile.dx
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end
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local paddle_left = paddle_x - paddle_width/2
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local paddle_right = paddle_x + paddle_width/2
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local paddle_top = paddle_y - paddle_height/2
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if paddle_left <= missile.x and missile.x <= paddle_right and paddle_top <= missile.y and missile.y <= paddle_y then
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-- Collision with the paddle
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missile.y = paddle_top
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missile.dy = -missile.dy
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if not missile.reflected then
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missile.reflected = true
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unreflected_missiles = unreflected_missiles - 1
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end
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end
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for _, city in ipairs(cities) do
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local dx = city.x - missile.x
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local dy = city.y - missile.y
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local distance = math.sqrt(dx * dx + dy * dy)
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if city.alive and distance < city_radius then
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spawnExplosion(missile.x, missile.y)
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-- Freeze the missile in-place
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missile.dx = 0
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missile.dy = 0
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end
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end
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if missile.reflected then
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for _, enemy in ipairs(enemies) do
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local dx = enemy.x - missile.x
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local dy = enemy.y - missile.y
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local distance = math.sqrt(dx * dx + dy * dy)
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if distance < enemy_radius then
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spawnExplosion(missile.x, missile.y)
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-- Freeze the missile in-place
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missile.dx = 0
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missile.dy = 0
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end
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end
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end
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local dx = missile.history[1].x - missile.x
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local dy = missile.history[1].y - missile.y
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local distance = math.sqrt(dx * dx + dy * dy)
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if distance >= 1 / scale then
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missile.history[1].length = distance
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missile.trail_length = missile.trail_length + distance
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table.insert(missile.history, 1, {
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x = missile.x,
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y = missile.y,
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length = nil,
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})
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-- Remove the oldest segments
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while missile.trail_length > missile_trail_length do
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local length = missile.history[#missile.history].length
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missile.trail_length = missile.trail_length - length
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table.remove(missile.history)
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end
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end
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end
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local i = 1
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while i <= #missiles do
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if missiles[i].y > 1 + missile_radius or not missiles[i].alive then
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-- Went off the bottom of the screen or exploded, delete
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table.remove(missiles, i)
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else
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i = i + 1
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end
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end
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end
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function updateExplosions(dt)
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local i = 1
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while i <= #explosions do
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local explosion = explosions[i]
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local completeness = (explosion_duration - explosion.remaining) / explosion_duration
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explosion.radius = completeness ^ 1.5 * explosion_radius
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-- Destroy missiles within range
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for _, missile in ipairs(missiles) do
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local dx = missile.x - explosion.x
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local dy = missile.y - explosion.y
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local distance = math.sqrt(dx * dx + dy * dy)
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if distance < explosion.radius then
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missile.alive = false
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end
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end
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-- Destroy enemies within range
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for _, enemy in ipairs(enemies) do
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local dx = enemy.x - explosion.x
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local dy = enemy.y - explosion.y
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local distance = math.sqrt(dx * dx + dy * dy)
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if distance < explosion.radius + enemy_radius then
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enemy.alive = false
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end
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end
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explosion.remaining = explosion.remaining - dt
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if explosion.remaining < explosion_duration * 0.2 then
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-- Destroy cities within range
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for _, city in ipairs(cities) do
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local dx = city.x - explosion.x
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local dy = city.y - explosion.y
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local distance = math.sqrt(dx * dx + dy * dy)
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if distance < explosion.radius + city_radius then
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city.alive = false
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end
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end
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end
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if explosion.remaining < 0 then
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table.remove(explosions, i)
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else
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i = i + 1
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end
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end
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end
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function updateEnemies(dt)
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local i = 1
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while i <= #enemies do
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local enemy = enemies[i]
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enemy.until_shoot = enemy.until_shoot - dt
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if enemy.until_shoot < 0 then
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enemy.until_shoot = enemy_min_shoot + math.random() * (enemy_max_shoot - enemy_min_shoot)
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if unreflected_missiles < unreflected_missiles_allowed then
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local target = cities[math.random(1, #cities)]
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local inaccuracy = math.random() * 2 * enemy_inaccuracy - enemy_inaccuracy
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local speed = missile_speed_min + math.random() * (missile_speed_max - missile_speed_min)
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spawnMissile(enemy.x, enemy.y, target.x + inaccuracy, target.y, speed)
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end
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end
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local dangle = 10 / (2 + enemy.until_shoot) * dt
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enemy.angle = enemy.angle + dangle
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if not enemy.alive then
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table.remove(enemies, i)
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else
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i = i + 1
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end
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end
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end
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function love.update(dt)
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updateMissiles(dt)
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updateExplosions(dt)
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updateEnemies(dt)
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time = time + dt
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if unreflected_missiles_allowed < unreflected_missiles_max and time >= unreflected_missiles_allowed * unreflected_missiles_allowed_ramp_up then
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unreflected_missiles_allowed = unreflected_missiles_allowed + 1
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end
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if #explosions == 0 and #missiles == 0 and #enemies == 0 then
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love.event.quit()
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end
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end
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function explodeAllReflected()
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for _, missile in ipairs(missiles) do
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if missile.reflected then
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spawnExplosion(missile.x, missile.y)
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-- Freeze the missile
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missile.dx = 0
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missile.dy = 0
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end
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end
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end
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function movePaddle(screen_x)
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paddle_x = fromScreenCoordinate(screen_x, 0)
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paddle_x = math.max(paddle_x, paddle_width/2 + wall_thickness)
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paddle_x = math.min(paddle_x, 1 - (paddle_width/2 + wall_thickness))
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paddle_y = 0.9
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end
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love.mousemoved = movePaddle
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love.mousepressed = explodeAllReflected
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love.resize = setScreenDimensions
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function drawWalls()
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love.graphics.setColor(0, 0, 1)
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local x, y = toScreenCoordinates(0, 0)
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local width = toScreenSize(1)
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local height =toScreenSize(wall_thickness)
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love.graphics.rectangle('fill', x, y, width, height)
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local width = toScreenSize(wall_thickness)
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local height = toScreenSize(1)
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love.graphics.rectangle('fill', x, y, width, height)
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local x, y = toScreenCoordinates(1 - wall_thickness, 0)
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love.graphics.rectangle('fill', x, y, width, height)
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end
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function drawMissiles()
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love.graphics.setLineWidth(0.001 * scale)
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-- Trails
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for _, missile in ipairs(missiles) do
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local dx = missile.history[1].x - missile.x
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local dy = missile.history[1].y - missile.y
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local length = math.sqrt(dx * dx + dy * dy)
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local from_x, from_y = toScreenCoordinates(missile.x, missile.y)
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for _, point in ipairs(missile.history) do
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local visibility = missile_trail_fade ^ length
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if point.length ~= nil then
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length = length + point.length
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end
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local x, y = toScreenCoordinates(point.x, point.y)
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if missile.reflected then
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love.graphics.setColor(1, 1, 0.5, visibility)
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else
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love.graphics.setColor(1, 0.4, 0, visibility)
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end
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love.graphics.line(from_x, from_y, x, y)
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from_x = x
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from_y = y
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end
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end
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-- Missiles themselves. Drawn separately so that they're always over the trails
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for _, missile in ipairs(missiles) do
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local style = 'fill'
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if missile.reflected then
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love.graphics.setColor(1, 0.5, 0)
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style = 'line'
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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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local x, y = toScreenCoordinates(missile.x, missile.y)
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local radius = toScreenSize(missile_radius)
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love.graphics.circle(style, x, y, radius)
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end
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end
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function drawPaddle()
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love.graphics.setColor(1, 1, 1)
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local x, y = toScreenCoordinates(paddle_x - paddle_width / 2, paddle_y - paddle_height / 2)
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local width = toScreenSize(paddle_width)
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local height = toScreenSize(paddle_height)
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love.graphics.rectangle('fill', x, y, width, height)
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end
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function drawCities()
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love.graphics.setColor(1, 1, 1)
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for _, city in ipairs(cities) do
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if city.alive then
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local x, y = toScreenCoordinates(city.x, city.y)
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local radius = toScreenSize(city_radius)
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love.graphics.circle('fill', x, y, radius)
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end
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end
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end
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function drawExplosions()
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for _, explosion in ipairs(explosions) do
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love.graphics.setColor(1, 0, 0)
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local x, y = toScreenCoordinates(explosion.x, explosion.y)
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local radius = toScreenSize(explosion.radius)
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love.graphics.circle('fill', x, y, radius)
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end
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end
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function drawEnemies()
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for _, enemy in ipairs(enemies) do
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love.graphics.setColor(0.7, 0.5, 1)
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local fifth = 2 * math.pi / 5
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local points = {}
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for i = 0, 4 do
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local x = enemy.x + math.cos(i * fifth + enemy.angle) * enemy_radius
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local y = enemy.y + math.sin(i * fifth + enemy.angle) * enemy_radius
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local x, y = toScreenCoordinates(x, y)
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table.insert(points, x)
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table.insert(points, y)
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end
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love.graphics.polygon('fill', points)
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end
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end
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function love.draw()
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drawCities()
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drawWalls()
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drawMissiles()
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drawPaddle()
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drawEnemies()
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drawExplosions()
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end
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