sketch 01

int i,j;

void setup() {

  size(800,600,P3D);

  background(255);

}

void draw() {

  stroke(100,0,0);

  strokeWeight(1);

  smooth();

  fill(255);

  i=mouseX-25;

  j=mouseY-25;

  triangle(i,(random(300)),(random(480)),j,i,350);

  delay(100);

}