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require "data.directions"
local Loot = require "objects.loot"
local physics = require "logic.physics"
local enemyData = require "data.enemyData"
local FrameTimer = require "utils.frameTimer"
local audio = require "utils.audio"
local Enemy = {}
Enemy.__index = Enemy
function Enemy:new(name, location)
local data = enemyData[name]
local obj = {
objectType = "enemy",
type = name,
presetLocation = (type(location) == "string" and location) or nil,
x = (type(location) == "table" and location.x) or nil,
y = (type(location) == "table" and location.y) or nil,
r = data.size or nil,
zoom = data.zoom or 1,
speed = data.speed or nil,
health = data.health or nil,
maxHealth = data.health or nil,
stunned = false,
frameTimer = FrameTimer:new(config.frameRate,
(data.sprite and data.sprite.totalFrames) or 1),
movePattern = data.movePattern or nil,
}
setmetatable(obj, Enemy)
return obj
end
-- enemy behaviors
function Enemy:move(dt)
-- deal with stunned status
if self.stunned and self.stunned > 0 then
self.stunned = self.stunned - dt
self.physicsBody:setLinearVelocity(0, 0)
return false
elseif self.stunned and self.stunned <= 0 then
self.stunned = nil
end
-- deal with sticky status
if self.sticky and self.sticky > 0 then
self.sticky = self.sticky - dt
if not self.originalSpeed then
self.originalSpeed = self.speed
end
self.speed = self.originalSpeed / (self.sticky + 1)
elseif self.sticky and self.sticky <= 0 then
self.sticky = nil
self.speed = self.originalSpeed
end
-- deal with punched status
if self.punched and self.punched > G.time then
return
end
if self.movePattern == "vertical" then
self:moveVertical(G.player.x, dt)
else self:moveTo(G.player.x, G.player.y, dt)
end
end
function Enemy:moveTo(x, y, dt)
local dv = self.speed
local dx, dy = x - self.physicsBody:getX(), y - self.physicsBody:getY()
local dist = math.sqrt(dx * dx + dy * dy)
if dist > 0 then
dx, dy = dx / dist, dy / dist
end
local vx, vy = dx * dv, dy * dv
self.physicsBody:setLinearVelocity(vx, vy)
end
function Enemy:moveVertical(toX, dt)
self:moveTo(toX, self.y, dt)
end
function Enemy:facing()
local dx = self.x - G.player.x
local dy = self.y - G.player.y
return utils.angleToDirection(utils.atan2(dy, dx))
end
-- enemy life cycle
function Enemy:takeDamage(damage)
self.health = self.health - damage
if self:isDead() then
self:die()
end
end
function Enemy:isDead()
return self.health <= 0
end
function Enemy:die()
audio.play("hit")
-- drop loots
for i, item in ipairs(enemyData[self.type].drops) do
local temp = math.random(10) / 10
if temp <= item.chances then
local offset = (i - 1) * 5
local lootItem = Loot:new(item.type, self.x + offset, self.y + offset)
table.insert(G.currentRoom.objects.loots, lootItem)
end
end
local enemies = G.currentRoom.objects.enemies
G.BodyLifeCycleManager:destroy(self.physicsBody)
table.remove(enemies, utils.indexof(enemies, self))
end
function Enemy:onHit(shot)
if enemyData[self.type] and enemyData[self.type].onHit then
enemyData[self.type].onHit(shot)
end
end
-- enemy status
function Enemy:stun(duration)
self.stunned = duration
end
function Enemy:getSticky(duration)
self.sticky = duration
end
-- initializers
function Enemy:placeInRoom(room)
local offset = self.r*2 + G.player.r*2 + config.summonMargin
if not self.x or not self.y then
self.x, self.y = room:getLocation(self.presetLocation or "random", offset)
end
G.BodyLifeCycleManager:create(self)
end
-- entry function
function Enemy:update(dt)
self:move(dt)
self.frameTimer:update(dt)
local data = physics.getObjectPosition(self)
self.x, self.y = data.x, data.y
end
return Enemy
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