For a school assignment, I am trying to simulate snow by having a number of ellipses move down the screen. I tried it with just one at first and it worked but what I´m having a hard time figuring out is how to continuously have it fall over and over in random places.
I wanna keep it as simple as possible as I only have a few days to complete it. I tried using an if-sentence to determine the Y-axis and so forth but I can´t seem to get it working.

CODE:


int size = 3;

float xpos, ypos;



float xspeed = 1.0;  // Speed of the shape
float yspeed = 1.0;  // Speed of the shape

int xdirection = 0;  // Left or Right
int ydirection = 1;  // Top to Bottom


void setup()
{
 size(640, 200);
 noStroke();
 frameRate(30);
 smooth();
 // Set the starting position of the shape
 xpos = random(0,640);
 ypos = 0;  
}

void draw()
{
 background(0);

 // Update the position of the shape
 xpos = xpos + ( xspeed * xdirection );
 ypos = ypos + ( yspeed * ydirection );
 snow();

}

void snow() {
 // Draw the shape
 ellipse(xpos+size/2, ypos+size/2, size, size);
 println(ypos);

}




Any help is appreciated