Stargate

class Star():
    def __init__(self):
        self.x = random(-width, width) #plots x in a random position between one end of the width of the screen to the other
        self.y = random(-height, height) #like the code above, from top to bottom of screen
        self.z = random(width) #even though animation is 2d, adding a z var creates depth, there is an illusion of stars being close and far
        self.pz = self.z #causes previous pos of z to start at z


    def update(self):
        self.z = self.z - speed #defines the speed of the stars by constantly changing its position
        if (self.z < 1): #if z becomes less than 1
            self.z = width #z should return back to its og position
            self.x = random(-width, width)
            self.y = random(-height, height)
            self.pz = self.z


    def show(self): #defines the show seen in def draw()

        sx = map(self.x / self.z, 0, 1, 0, width) #maps a ratio
        sy = map(self.y / self.z, 0, 1, 0, height)

        px = map(self.x / self.pz, 0, 1, 0, width)
        py = map(self.y / self.pz, 0, 1, 0, height)

        self.pz = self.z

        line(px, py, sx, sy) #draws the line of the stars (when speed increases) according to their previous pos and their current pos


stars = []

def setup():
    global stars #defines stars as a global var
    size(2000, 1000) #size of the screen
    for i in range(4000): #amount of stars that can be produced at a time
        stars.append(i) #continuously adds more stars
        stars[i] = Star()


def draw():
    global stars, speed #defines stars and speed as global vars
    speed = map(mouseX, 0, width, 0, 90) #speed of production and movement of stars according to mousex position between 0 and width and 0 and 90
    background(0) #color of bg (black)
    translate(width / 2, height / 2) #centers the image on the screen

    for i in range(4000):
        stroke(random(255), 1, 255) #changes the color of stars between pink, blue and purple
        stars[i].update() #updates the position of the stars on the screen
        stars[i].show() #shows the stars on the screen