Initial Commit

main.lua

@@ -0,0 +1,249 @@
+--[[ LOVE STUFF ]]
+function love.load()
+  maxTime = 0
+  timer = 0
+  score = 0
+
+  gameState = "menu"
+
+  sprites = {}
+  sprites.player = love.graphics.newImage('assets/character.png')
+  sprites.bullet = love.graphics.newImage('assets/bullet.png')
+  sprites.zombie = love.graphics.newImage('assets/zombie.png')
+  sprites.background = love.graphics.newImage('assets/background.jpg')
+
+  player = {}
+  player.speed = 180
+  player.sprite = sprites.player
+
+  zombies = {}
+  bullets = {}
+
+  killableTables = {bullets, zombies}
+end
+
+function love.update(dt)
+  if gameState == "game" then
+    movePlayer(dt)
+    moveZombie(dt)
+    moveBullet(dt)
+
+    checkCollisions(dt)
+    cleanUp(dt)
+    timer = timer - dt
+    if timer <= 0 then
+      spawnZombie()
+      maxTime = maxTime * 0.95
+      timer = maxTime
+    end
+  end
+  if gameState == "menu" then
+    love.graphics.setColor(255, 255, 255)
+    love.graphics.setFont(love.graphics.newFont(40))
+    love.graphics.printf("Click anywhere to begin",  0, 50, love.graphics.getWidth(), "center")
+  end
+end
+
+function love.draw()
+  if gameState == "game" then
+    love.graphics.draw(sprites.background, 0, 0)
+    drawPlayer()
+    drawZombies()
+    drawBullets()
+    love.graphics.setFont(love.graphics.newFont(20))
+    love.graphics.print("Score:" .. score)
+  end
+end
+
+function love.mousepressed(x, y, button, isTouch)
+  if button == 1 then
+    if gameState == "game" then
+      spawnBullet()
+    end
+    if gameState == "menu" then
+      newGame()
+    end
+  end
+end
+
+--[[ GENERAL ]]
+function newGame()
+  score = 0
+  player.x = love.graphics.getWidth()/2
+  player.y = love.graphics.getHeight()/2
+  clearZombies()
+  gameState = "game"
+  maxTime = 2
+  timer = maxTime
+end
+
+
+function checkCollisions(dt)
+  -- zombies and player
+  for i,z in ipairs(zombies) do
+    if distanceBetweenObjects(z, player) < 30 then
+      gameState = "menu" -- gameover
+    end
+  end
+  -- zombies and bullets
+  for i,z in ipairs(zombies) do
+    for j,b in ipairs(bullets) do
+      if distanceBetweenObjects(z, b) < 30 then
+        z.dead = true
+        b.dead = true
+        score = score + 1
+      end
+    end
+  end
+end
+
+
+function cleanUp(dt)
+  for x, t in ipairs(killableTables) do
+    for i=#t, 1, -1 do
+      if t[i].dead == true then
+          table.remove(t, i)
+      end
+    end
+  end
+end
+
+
+--[[ PLAYER ]]
+function drawPlayer()
+  love.graphics.draw(
+    player.sprite,
+    player.x, player.y,
+    player.rotation,
+    nil, nil,
+    15.5, 21.5
+  )
+end
+
+function movePlayer(dt)
+  player.rotation = radians_between({["x"] = love.mouse.getX(), ["y"] = love.mouse.getY()}, player)
+
+  if love.keyboard.isDown('s') then
+    player.y = player.y + player.speed * dt
+  end
+  if love.keyboard.isDown('w') then
+    player.y = player.y - player.speed * dt
+  end
+
+  if love.keyboard.isDown('a') then
+    player.x = player.x - player.speed * dt
+  end
+  if love.keyboard.isDown('d') then
+    player.x = player.x + player.speed * dt
+  end
+  player.x = math.Clamp(0, player.x, love.graphics.getWidth())
+  player.y = math.Clamp(0, player.y, love.graphics.getHeight())
+end
+
+--[[ ZOMBIE STUFF ]]
+function drawZombies()
+  for i,z in ipairs(zombies) do
+    love.graphics.draw(
+      z.sprite,
+      z.x, z.y,
+      radians_between(player, z),
+      nil, nil,
+      z.sprite:getWidth()/2, z.sprite:getHeight()/2
+    )
+  end
+end
+function spawnZombie()
+  zombie = {}
+  zombie.x = math.random(0, love.graphics.getWidth())
+  zombie.y = math.random(0, love.graphics.getHeight())
+  zombie.dead = false
+  zombie.speed = 100
+  zombie.sprite = sprites.zombie
+
+  local side = math.random(1, 4)
+  if side == 1 then
+    zombie.x = -30
+  elseif side == 2 then
+    zombie.y = -30
+  elseif side == 3 then
+    zombie.x = love.graphics.getWidth() + 30
+  elseif side == 4 then
+    zombie.y = love.graphics.getHeight() + 30
+  end
+
+  table.insert(zombies, zombie)
+end
+
+function moveZombie(dt)
+  for i,z in ipairs(zombies) do
+    radians = radians_between(player, z)
+    z.x = z.x + math.cos(radians) * z.speed * dt
+    z.y = z.y + math.sin(radians) * z.speed * dt
+  end
+end
+
+function clearZombies()
+  for i=#zombies, 1, -1 do
+    table.remove(zombies, i)
+  end
+end
+--[[ BULLET ]]
+function spawnBullet()
+  bullet = {}
+  bullet.x = player.x
+  bullet.y = player.y
+  bullet.dead = false
+  bullet.speed = 500
+  bullet.sprite = sprites.bullet
+  bullet.direction = player.rotation
+
+  table.insert(bullets, bullet)
+end
+
+function drawBullets()
+  for i, b in ipairs(bullets) do
+    love.graphics.draw(
+      b.sprite,
+      b.x, b.y,
+      b.direction,
+      0.5, 0.5,
+      b.sprite:getWidth()/2, b.sprite:getHeight()/2
+    )
+    -- 46, 31
+  end
+end
+
+function moveBullet(dt)
+  for i, b in ipairs(bullets) do
+    b.x = b.x + math.cos(b.direction) * b.speed * dt
+    b.y = b.y + math.sin(b.direction) * b.speed * dt
+  end
+
+  for i=#bullets, 1, -1 do
+    local b = bullets[i]
+    if b.x < 0 or b.x > love.graphics.getWidth() or b.y < 0 or b.y > love.graphics.getHeight() then
+      table.remove(bullets, i)
+    end
+  end
+end
+
+--[[ MATH STUFF ]]
+
+function distanceBetweenObjects(obj1, obj2)
+  return distanceBetween(obj1.x, obj1.y, obj2.x, obj2.y)
+end
+
+function distanceBetween(x1, y1, x2, y2)
+  return math.sqrt((y2 - y1)^2 + (x2 - x1)^2)
+end
+
+function radians_between(me, target)
+  return math.atan2(me.y - target.y, me.x - target.x)
+end
+
+
+function math.Clamp(lower, val, upper)
+    assert(val and lower and upper, "not very useful error message here")
+    if lower > upper then lower, upper = upper, lower end -- swap if boundaries supplied the wrong way
+    return math.max(lower, math.min(upper, val))
+end