Ball lua

Ball = {}
Ball.__index = Ball


function Ball.create(x, y, width, height)
    -- Set up default arguments.
    x = x or 0
    y = y or 0
    width = width or 20
    height = height or 20

    local ball = {}
    setmetatable(ball, Ball)

    -- Set data members from params.
    ball.x = x
    ball.y = y
    ball.width = width
    ball.height = height

    -- Set default data members not in constructor params.
    ball.speed = 0
    ball.heading = {}
    ball.heading.x = 0
    ball.heading.y = 0

    return ball
end


function Ball:setSpeed(speed)
    self.speed = speed
end


function Ball:setHeading(x, y)
    self.heading.x = x
    self.heading.y = y
end


function Ball:tick(dt)
    self.x = self.x + math.cos(self.heading.x / (self.speed * dt) )
    self.y = self.y + math.cos(self.heading.y / (self.speed * dt) )
end


function Ball:render()
    love.graphics.rectangle("fill", self.x, self.y, self.width, self.height)
end