[PC/gLib2D] star.lua

math.randomseed(os.time())
math.random()

local NB_STARS = 70

local Star = {}
Star.__index = Star

function Star:new()
    return setmetatable({
            x = math.random(0, g2d.SCR_W),y = math.random(0, g2d.SCR_H),
            color = g2d.WHITE, far = math.random(0, 255)
        },
        self)
end

function Star:draw()
    g2d.SetCoordXY(self.x, self.y)
    g2d.SetColor(self.color)
    g2d.SetAlpha(self.far)
    g2d.Add()
end

function Star:move()
    self.x = self.x + self.far/200
    if(self.x > g2d.SCR_W) then
        self.x, self.y = 0, math.random(0, g2d.SCR_H)
        self.far = math.random(0, 255)
    end
end

local star = {}
for i = 1, NB_STARS do
    star[i] = Star:new()
end

while true do
    g2d.Clear(g2d.BLACK)

    g2d.BeginPoints(g2d.VOID)
        for i = 1, NB_STARS do
            star[i]:move()
            star[i]:draw()
        end
    g2d.End()

    g2d.Flip(g2d.VSYNC)
end