// Pressing Control-R will render this sketch.

int i = 0; 

void setup() {  // this is run once.   
    background(255);
    size(300, 400); 
    smooth();
    frameRate(5);
    strokeWeight(25);
}

void draw() {    
    stroke(random(50), random(255), random(255), 100);
    line(i, 0, random(0, width), height);
    if (i < width) {
        i++;
    } else {
        i = 0; 
    }
}