Ball.lua

Ball = Class{}

function Ball :init( x, y, width, height )
    self.x = x
    self.y = y
    self.width = width
    self.height = height
    self.size = 6
    self.dx = math.random(2) == 1 and -150 or 150  --  ternary operation of 'x:true?false'
    self.dy = math.random(-50, 50)
end


function Ball :collides( box )
    if self.x > box.x +box.width or self.x +self.width < box.x then
        return false
    end

    if self.y > box.y +box.height or self.y +self.height < box.y then
        return false
    end

    return true
end


function Ball :reset()
    self.x = VIRTUAL_WIDTH /2 -3
    self.y = VIRTUAL_HEIGHT /2 -3

    self.dx = math.random(2) == 1 and -100 or 100    -- ternary operation of 'x:true?false'
    self.dy = math.random( -50, 50 )
end


function Ball :update( dt )
    self.x = self.x +self.dx *dt
    self.y = self.y +self.dy *dt
end


function Ball :render()  --  before setting the color coz we want ball to be white
    love .graphics .rectangle( 'fill',  self.x,  self.y,  self.size,  self.size )
end