Day 4

-- main.lua — every Love2D game starts here

function love.load()
  -- Called once at startup
  -- Initialize all your game state here
  love.window.setTitle("My Game")
  love.window.setMode(800, 600, {resizable=false, vsync=true})
end

function love.update(dt)
  -- Called every frame; dt = seconds since last frame (usually ~0.016)
  -- Update positions, physics, AI, timers here
end

function love.draw()
  -- Called after update; render everything here
  -- Love2D clears the screen before each draw call
  love.graphics.setColor(1, 1, 1)   -- white (RGBA, 0-1 range)
  love.graphics.print("Hello, Love2D!", 10, 10)
end

function love.keypressed(key)
  -- Called once when a key is first pressed
  if key == "escape" then love.event.quit() end
end

-- main.lua — player controlled with arrow keys or WASD

local player = {}
local SPEED  = 200   -- pixels per second

function love.load()
  love.window.setMode(800, 600)
  player = {
    x     = 400,
    y     = 300,
    w     = 40,
    h     = 40,
    color = {0.2, 0.6, 1},  -- blue
  }
end

function love.update(dt)
  local dx, dy = 0, 0

  if love.keyboard.isDown("left",  "a") then dx = -1 end
  if love.keyboard.isDown("right", "d") then dx =  1 end
  if love.keyboard.isDown("up",    "w") then dy = -1 end
  if love.keyboard.isDown("down",  "s") then dy =  1 end

  -- Normalize diagonal movement
  if dx ~= 0 and dy ~= 0 then
    local len = math.sqrt(dx*dx + dy*dy)
    dx, dy = dx/len, dy/len
  end

  player.x = player.x + dx * SPEED * dt
  player.y = player.y + dy * SPEED * dt

  -- Clamp to screen bounds
  local W, H = love.graphics.getDimensions()
  player.x = math.max(0, math.min(W - player.w, player.x))
  player.y = math.max(0, math.min(H - player.h, player.y))
end

function love.draw()
  love.graphics.setColor(player.color)
  love.graphics.rectangle("fill", player.x, player.y, player.w, player.h)

  -- HUD
  love.graphics.setColor(1, 1, 1)
  love.graphics.print(string.format("x=%.0f y=%.0f", player.x, player.y), 8, 8)
  love.graphics.print(love.timer.getFPS() .. " FPS", 740, 8)
end

function love.keypressed(key)
  if key == "escape" then love.event.quit() end
end

-- AABB collision helper
local function aabb(a, b)
  return a.x < b.x + b.w
     and a.x + a.w > b.x
     and a.y < b.y + b.h
     and a.y + a.h > b.y
end

-- Enemy factory
local function make_enemy(x, y)
  return {
    x = x, y = y,
    w = 32, h = 32,
    vx = math.random(-120, 120),
    vy = math.random(-80, 80),
    alive = true,
  }
end

local enemies = {}
local score   = 0

function love.load()
  love.window.setMode(800, 600)
  math.randomseed(os.time())
  for i = 1, 8 do
    table.insert(enemies, make_enemy(
      math.random(50, 750),
      math.random(50, 550)
    ))
  end
  -- (assume player table from previous example)
end

function love.update(dt)
  local W, H = love.graphics.getDimensions()

  -- Move and bounce enemies
  for _, e in ipairs(enemies) do
    if e.alive then
      e.x = e.x + e.vx * dt
      e.y = e.y + e.vy * dt
      if e.x < 0 or e.x + e.w > W then e.vx = -e.vx end
      if e.y < 0 or e.y + e.h > H then e.vy = -e.vy end

      -- Check collision with player
      if aabb(player, e) then
        e.alive = false
        score   = score + 10
      end
    end
  end

  -- (player movement code from above goes here too)
end

function love.draw()
  -- Player
  love.graphics.setColor(0.2, 0.6, 1)
  love.graphics.rectangle("fill", player.x, player.y, player.w, player.h)

  -- Enemies
  for _, e in ipairs(enemies) do
    if e.alive then
      love.graphics.setColor(1, 0.3, 0.3)
      love.graphics.rectangle("fill", e.x, e.y, e.w, e.h)
    end
  end

  -- Score
  love.graphics.setColor(1, 1, 1)
  love.graphics.print("Score: " .. score, 8, 8)
end

# A .love file is just a ZIP with main.lua at the root
cd /path/to/your/game
zip -9 -r mygame.love .

# Run it directly
love mygame.love

# On macOS — bundle into an .app (distribute standalone)
# Download the Love2D macOS .app, then:
cp mygame.love "love.app/Contents/Resources/mygame.love"
# Rename love.app to mygame.app and distribute

# Linux AppImage or Windows EXE: see love2d.org/wiki/Game_Distribution