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local Enemy = {}
local Entity = require("entity")
Enemy.__index = Enemy
setmetatable(Enemy, { __index = Entity })
function Enemy.new(spawnX, spawnY, width, height, physicsWidth, physicsHeight)
local self = setmetatable(Entity:new(spawnX or 0, spawnY or 0, width or 16, height or 16, physicsWidth or width or 8, physicsHeight or height or 8), Enemy)
self.isEnemy = true
self.direction = math.random(1, 2) == 1 and 1 or -1
self.speed = 20
self.turnDelay = 0.35
self.turning = false
self.turnTimer = 0
return self
end
function Enemy:setWorldContext(world)
self.world = world
self:enablePhysics(world.physicsWorld, "dynamic")
end
function Enemy:noPathAhead()
if not self.world then return false end
local frontX
if self.direction == 1 then
frontX = self.x + self.physicsWidth * 1.5 + 1
else
frontX = self.x + self.physicsWidth * 0.5 - 1
end
local midY = self.y + self.physicsHeight * 0.5
local belowY = self.y + self.physicsHeight + 1
local wallAhead = self.world:isTileSolidAtPixel(frontX, midY)
local floorAhead = self.world:isTileSolidAtPixel(frontX, belowY)
return wallAhead or not floorAhead
end
function Enemy:patrolPlatform(dt)
self:syncFromPhysicsBody()
if self.turning then
self.turnTimer = self.turnTimer - dt
if self.turnTimer <= 0 then
self.direction = self.direction * -1
self.turning = false
end
if self.body then
local _, vy = self.body:getLinearVelocity()
self.body:setLinearVelocity(0, vy)
end
return
end
if self:noPathAhead() then
self.turning = true
self.turnTimer = self.turnDelay
end
if self.body then
local _, vy = self.body:getLinearVelocity()
self.body:setLinearVelocity(self.speed * self.direction, vy)
end
end
function Enemy:update(dt)
self:patrolPlatform(dt)
end
function Enemy:draw()
--bug: texture is drawn shifted by half width to the left
love.graphics.draw(self.texture, self.x + self.physicsWidth / 2, self.y)
end
return Enemy
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