void setup(){
size(400, 400);
background(255);
smooth();
}

float x = 100;
float angle = 0;
float z = 20;
int i=0;

void draw(){
float j= 200+ (cos(angle)*180);
point(i, j);
i+=1;
angle+=z;
stroke(random(0,255),random(0,255),random(0,255),random(100,150));
strokeWeight(30);

}